当前位置：首页 > news >正文

【k8s 开发排错】k8s组件开发排错之pprof

news 2026/2/9 18:24:00

参考

Kubernetes组件问题排查的一些方法 - 知乎
go 程序性能调优 pprof 的使用（一） - 润新知
Go进阶系列之性能分析神器pprof__好吗_好的的博客-CSDN博客
k8s各组件端口_k8s10259端口-CSDN博客
Go调试神器pprof使用教程【实战分享】_NPE~的博客-CSDN博客

pprof的常用方式

使用交互式命令

查看堆栈调用信息

go tool pprof http://localhost:8001/debug/pprof/heap

查看 30 秒内的 CPU 信息

go tool pprof http://localhost:8001/debug/pprof/profile?seconds=30

查看 goroutine 阻塞

go tool pprof http://localhost:8001/debug/pprof/block

收集 5 秒内的执行路径

go tool pprof http://localhost:8001/debug/pprof/trace?seconds=5

互斥持有者的堆栈跟踪

go tool pprof http://localhost:8001/debug/pprof/mutex

通过UI界面

UI分析工具使用起来相对比较麻烦，我们需要先导出文件，然后再使用go tool工具起服务进行分析。

比如我们导出kube-scheduler的堆栈信息。

curl -sK -v http://localhost:10251/debug/pprof/heap > heap.out

然后使用go tool工具起一个服务，如下：

go tool pprof -http=0.0.0.0:8989 heap.out

然后就可以在浏览器上看到具体的堆栈信息图了。

注意，这里需要在服务端安装graphviz组件，各种操作系统的安装方式见https://www.graphviz.org/download/#linux

交互时的一些命令

(pprof) helpCommands:callgrind        Outputs a graph in callgrind formatcomments         Output all profile commentsdisasm           Output assembly listings annotated with samplesdot              Outputs a graph in DOT formateog              Visualize graph through eogevince           Visualize graph through evincegif              Outputs a graph image in GIF formatgv               Visualize graph through gvkcachegrind      Visualize report in KCachegrindlist             Output annotated source for functions matching regexppdf              Outputs a graph in PDF formatpeek             Output callers/callees of functions matching regexppng              Outputs a graph image in PNG formatproto            Outputs the profile in compressed protobuf formatps               Outputs a graph in PS formatraw              Outputs a text representation of the raw profilesvg              Outputs a graph in SVG formattags             Outputs all tags in the profiletext             Outputs top entries in text formtop              Outputs top entries in text formtopproto         Outputs top entries in compressed protobuf formattraces           Outputs all profile samples in text formtree             Outputs a text rendering of call graphweb              Visualize graph through web browserweblist          Display annotated source in a web browsero/options        List options and their current valuesquit/exit/^D     Exit pprofOptions:call_tree        Create a context-sensitive call treecompact_labels   Show minimal headersdivide_by        Ratio to divide all samples before visualizationdrop_negative    Ignore negative differencesedgefraction     Hide edges below <f>*totalfocus            Restricts to samples going through a node matching regexphide             Skips nodes matching regexpignore           Skips paths going through any nodes matching regexpmean             Average sample value over first value (count)nodecount        Max number of nodes to shownodefraction     Hide nodes below <f>*totalnoinlines        Ignore inlines.normalize        Scales profile based on the base profile.output           Output filename for file-based outputsprune_from       Drops any functions below the matched frame.relative_percentages Show percentages relative to focused subgraphsample_index     Sample value to report (0-based index or name)show             Only show nodes matching regexpshow_from        Drops functions above the highest matched frame.source_path      Search path for source filestagfocus         Restricts to samples with tags in range or matched by regexptaghide          Skip tags matching this regexptagignore        Discard samples with tags in range or matched by regexptagshow          Only consider tags matching this regexptrim             Honor nodefraction/edgefraction/nodecount defaultstrim_path        Path to trim from source paths before searchunit             Measurement units to displayOption groups (only set one per group):cumulative       cum              Sort entries based on cumulative weightflat             Sort entries based on own weightgranularity      addresses        Aggregate at the address level.filefunctions    Aggregate at the function level.files            Aggregate at the file level.functions        Aggregate at the function level.lines            Aggregate at the source code line level.:   Clear focus/ignore/hide/tagfocus/tagignoretype "help <cmd|option>" for more information

top 命令

输入命令 top 10 查看对应资源开销 （例如 cpu就是执行耗时/开销 Memory 就是内存占用大小）排名前十的函数
(pprof) top 10
Showing nodes accounting for 10.82s, 79.97% of 13.53s total
Dropped 64 nodes (cum <= 0.07s)
Showing top 10 nodes out of 61flat  flat%   sum%        cum   cum%7.50s 55.43% 55.43%      7.56s 55.88%  runtime.stdcall11.88s 13.90% 69.33%      1.90s 14.04%  runtime.cgocall0.31s  2.29% 71.62%      2.25s 16.63%  runtime.timerproc0.26s  1.92% 73.54%      0.26s  1.92%  runtime.(*mcache).prepareForSweep0.20s  1.48% 75.02%      0.53s  3.92%  runtime.acquirep0.18s  1.33% 76.35%      0.18s  1.33%  runtime.casgstatus0.15s  1.11% 77.46%      1.18s  8.72%  runtime.exitsyscall0.12s  0.89% 78.34%      0.52s  3.84%  runtime.goroutineReady0.11s  0.81% 79.16%      8.79s 64.97%  runtime.systemstack0.11s  0.81% 79.97%      0.11s  0.81%  runtime.unlockflat：当前函数上运行耗时
flat%：函数自身占用的 CPU 运行耗时总比例
sum%：函数自身累积使用 CPU 总比例
cum：当前函数及其调用函数的运行总耗时
cum%：函数自身及其调用函数占 CPU 运行耗时总比例
最后一列为函数名称
大多数情况下，我们可以得出一个应用程序的运行情况，知道当前是什么函数，正在做什么事情，占用了多少资源等。

实际使用

k8s 各组件暴露的端口

kube-proxy

10249：用于节点上的kubeproxy的健康检查和状态查询。
10256：用于NodePort服务的负载均衡。
portpool（30000-32767）：NodePort服务的端口范围，这些端口用于外部流量访问Kubernetes集群中的服务。

kubelet

10250：kubelet API服务器的端口，用于集群中的其他组件（如kube-scheduler、kube-controller-manager、kubectl）与kubelet进行通信。此端口通常由Kubernetes的授权策略进行保护，只允许授权用户或组访问。
10255：kubelet的只读端口，用于提供节点的健康状况以及容器运行时信息的监控数据。
10248：kubelet的非安全端口，用于提供节点的健康状况以及容器运行时信息的监控数据。此端口不受Kubernetes的授权策略保护。
36888：kubelet启动时随机分配的端口，用于处理容器日志收集器fluentd的日志转发请求。

kube-schedule

10251：kube-scheduler和kube-apiserver组件之间的通信端口，用于接收来自kube-apiserver的调度请求，并将调度结果返回给kube-apiserver。
10259：kube-scheduler和kubectl之间的通信端口，用于获取当前的集群调度状态，并进行一些操作，如手动重新调度Pod等。

kube-controller

10252：kube-controller-manager和kube-apiserver之间的通信端口，用于接收kube-apiserver发送的请求，包括同步cluster state、管理Pod副本数、节点状态等。
10257：用于提供/metrics和/healthz等信息，包括kube-controller-manager的运行状态、性能指标等。

kube-apiserver

6443：通过该端口可以访问Kubernetes API服务器的RESTful API，从而实现对Kubernetes集群的管理和控制。通过kube-apiserver，可以进行集群的配置、资源调度、容器编排、应用部署等操作。

etcd

2379：etcd客户端和etcd节点进行数据读写的端口
2380：etcd集群内部节点之间进行同步的端口
2381：用于监控etcd性能指标的URL列表。

kube-controller-manager 排错

top 显示信息比较简略
tree 显示信息比较详细

# 为了排查 kube-controller-manager cpu 占用异常问题（达到 100% 多）
# 1. 首先更改 kube-controller-manager 配置 yaml，打开 profiling 就是设置 profili=True
# 2. 利用 pprof 采集 10252 端口信息
[root]# go tool pprof http://localhost:10252/debug/pprof/profile?seconds=60
Fetching profile over HTTP from http://localhost:10252/debug/pprof/profile?seconds=60
Saved profile in /root/pprof/pprof.kube-controller-manager.samples.cpu.002.pb.gz
File: kube-controller-manager
Type: cpu
Time: Jul 27, 2027 at 5:19am (CST)
Duration: 1mins, Total samples = 1.07mins (106.85%)
Entering interactive mode (type "help" for commands, "o" for options)
# top 显示信息比较简略
(pprof) top
Showing nodes accounting for 27.60s, 42.92% of 64.31s total
Dropped 319 nodes (cum <= 0.32s)
Showing top 10 nodes out of 101flat  flat%   sum%        cum   cum%5.18s  8.05%  8.05%      5.62s  8.74%  runtime.nanotime4.03s  6.27% 14.32%      4.42s  6.87%  runtime.walltime3.99s  6.20% 20.53%      3.99s  6.20%  aeshashbody2.41s  3.75% 24.27%      9.15s 14.23%  runtime.nilinterhash2.34s  3.64% 27.91%      5.09s  7.91%  runtime.mallocgc2.17s  3.37% 31.29%      6.64s 10.32%  runtime.typehash2.11s  3.28% 34.57%      2.11s  3.28%  k8s.io/kubernetes/vendor/github.com/prometheus/client_golang/prometheus.(*histogram).observe1.96s  3.05% 37.61%      7.61s 11.83%  runtime.mapdelete1.71s  2.66% 40.27%      5.78s  8.99%  runtime.mapassign1.70s  2.64% 42.92%      6.42s  9.98%  runtime.mapaccess2
(pprof) top 
Showing nodes accounting for 27.60s, 42.92% of 64.31s total
Dropped 319 nodes (cum <= 0.32s)
Showing top 10 nodes out of 101flat  flat%   sum%        cum   cum%5.18s  8.05%  8.05%      5.62s  8.74%  runtime.nanotime4.03s  6.27% 14.32%      4.42s  6.87%  runtime.walltime3.99s  6.20% 20.53%      3.99s  6.20%  aeshashbody2.41s  3.75% 24.27%      9.15s 14.23%  runtime.nilinterhash2.34s  3.64% 27.91%      5.09s  7.91%  runtime.mallocgc2.17s  3.37% 31.29%      6.64s 10.32%  runtime.typehash2.11s  3.28% 34.57%      2.11s  3.28%  k8s.io/kubernetes/vendor/github.com/prometheus/client_golang/prometheus.(*histogram).observe1.96s  3.05% 37.61%      7.61s 11.83%  runtime.mapdelete1.71s  2.66% 40.27%      5.78s  8.99%  runtime.mapassign1.70s  2.64% 42.92%      6.42s  9.98%  runtime.mapaccess2
(pprof) call_tree
# tree 显示信息比较详细
(pprof) tree
Showing nodes accounting for 58.49s, 90.95% of 64.31s total
Dropped 319 nodes (cum <= 0.32s)
Showing top 80 nodes out of 101
----------------------------------------------------------+-------------flat  flat%   sum%        cum   cum%   calls calls% + context              
----------------------------------------------------------+-------------3.73s 66.37% |   time.now1.85s 32.92% |   time.Since5.18s  8.05%  8.05%      5.62s  8.74%                | runtime.nanotime0.44s  7.83% |   runtime.nanotime1
----------------------------------------------------------+-------------4.42s   100% |   time.now (inline)4.03s  6.27% 14.32%      4.42s  6.87%                | runtime.walltime0.39s  8.82% |   runtime.walltime1
----------------------------------------------------------+-------------3.99s   100% |   runtime.typehash3.99s  6.20% 20.53%      3.99s  6.20%                | aeshashbody
----------------------------------------------------------+-------------3.27s 35.74% |   runtime.mapaccess23.09s 33.77% |   runtime.mapassign2.79s 30.49% |   runtime.mapdelete2.41s  3.75% 24.27%      9.15s 14.23%                | runtime.nilinterhash6.64s 72.57% |   runtime.typehash
----------------------------------------------------------+-------------2.47s 48.53% |   runtime.convTstring1.43s 28.09% |   runtime.growslice1.16s 22.79% |   runtime.rawstring2.34s  3.64% 27.91%      5.09s  7.91%                | runtime.mallocgc0.69s 13.56% |   runtime.(*mcentral).cacheSpan0.65s 12.77% |   runtime.heapBitsSetType0.61s 11.98% |   runtime.nextFreeFast (inline)0.09s  1.77% |   runtime.scanobject0.07s  1.38% |   runtime.gentraceback
----------------------------------------------------------+-------------6.64s   100% |   runtime.nilinterhash2.17s  3.37% 31.29%      6.64s 10.32%                | runtime.typehash3.99s 60.09% |   aeshashbody0.48s  7.23% |   runtime.strhash
----------------------------------------------------------+-------------2.11s   100% |   k8s.io/kubernetes/vendor/github.com/prometheus/client_golang/prometheus.(*histogram).Observe2.11s  3.28% 34.57%      2.11s  3.28%                | k8s.io/kubernetes/vendor/github.com/prometheus/client_golang/prometheus.(*histogram).observe
----------------------------------------------------------+-------------3.96s 52.04% |   k8s.io/kubernetes/vendor/k8s.io/client-go/util/workqueue.set.delete1.48s 19.45% |   k8s.io/kubernetes/vendor/k8s.io/client-go/util/workqueue.(*defaultQueueMetrics).done1.41s 18.53% |   k8s.io/kubernetes/vendor/k8s.io/client-go/util/workqueue.(*defaultQueueMetrics).get0.76s  9.99% |   k8s.io/kubernetes/vendor/k8s.io/client-go/util/workqueue.(*ItemExponentialFailureRateLimiter).Forget1.96s  3.05% 37.61%      7.61s 11.83%                | runtime.mapdelete2.79s 36.66% |   runtime.nilinterhash1.38s 18.13% |   runtime.nilinterequal1.22s 16.03% |   runtime.memclrHasPointers
----------------------------------------------------------+-------------3.01s 52.08% |   k8s.io/kubernetes/vendor/k8s.io/client-go/util/workqueue.set.insert1.41s 24.39% |   k8s.io/kubernetes/vendor/k8s.io/client-go/util/workqueue.(*defaultQueueMetrics).add1.36s 23.53% |   k8s.io/kubernetes/vendor/k8s.io/client-go/util/workqueue.(*defaultQueueMetrics).get1.71s  2.66% 40.27%      5.78s  8.99%                | runtime.mapassign3.09s 53.46% |   runtime.nilinterhash0.54s  9.34% |   runtime.typedmemmove
----------------------------------------------------------+-------------3.44s 53.58% |   k8s.io/kubernetes/vendor/k8s.io/client-go/util/workqueue.set.has1.40s 21.81% |   k8s.io/kubernetes/vendor/k8s.io/client-go/util/workqueue.(*defaultQueueMetrics).get1.15s 17.91% |   k8s.io/kubernetes/vendor/k8s.io/client-go/util/workqueue.(*defaultQueueMetrics).done0.43s  6.70% |   k8s.io/kubernetes/vendor/k8s.io/client-go/util/workqueue.(*defaultQueueMetrics).add1.70s  2.64% 42.92%      6.42s  9.98%                | runtime.mapaccess23.27s 50.93% |   runtime.nilinterhash1.35s 21.03% |   runtime.nilinterequal
----------------------------------------------------------+-------------0.48s 28.57% |   k8s.io/kubernetes/vendor/k8s.io/client-go/util/workqueue.(*Type).ShuttingDown0.36s 21.43% |   k8s.io/kubernetes/vendor/k8s.io/client-go/util/workqueue.(*Type).Add0.34s 20.24% |   k8s.io/kubernetes/vendor/k8s.io/client-go/util/workqueue.(*Type).Get0.27s 16.07% |   k8s.io/kubernetes/vendor/k8s.io/client-go/util/workqueue.(*Type).Done0.23s 13.69% |   k8s.io/kubernetes/vendor/k8s.io/client-go/util/workqueue.(*ItemExponentialFailureRateLimiter).Forget1.68s  2.61% 45.53%      1.68s  2.61%                | sync.(*Mutex).Unlock
----------------------------------------------------------+-------------2.59s 96.64% |   runtime.gcDrain0.09s  3.36% |   runtime.mallocgc1.65s  2.57% 48.10%      2.68s  4.17%                | runtime.scanobject0.41s 15.30% |   runtime.greyobject0.39s 14.55% |   runtime.findObject
----------------------------------------------------------+-------------0.45s 28.66% |   k8s.io/kubernetes/vendor/k8s.io/client-go/util/workqueue.(*Type).Done0.41s 26.11% |   k8s.io/kubernetes/vendor/k8s.io/client-go/util/workqueue.(*Type).Get0.37s 23.57% |   k8s.io/kubernetes/vendor/k8s.io/client-go/util/workqueue.(*Type).ShuttingDown0.33s 21.02% |   k8s.io/kubernetes/vendor/k8s.io/client-go/util/workqueue.(*Type).Add1.57s  2.44% 50.54%      1.57s  2.44%                | sync.(*Mutex).Lock
----------------------------------------------------------+-------------1.19s   100% |   runtime.efaceeq0.90s  1.40% 51.94%      1.19s  1.85%                | runtime.strequal0.29s 24.37% |   runtime.memequal
----------------------------------------------------------+-------------2.53s   100% |   runtime.concatstring30.86s  1.34% 53.27%      2.53s  3.93%                | runtime.concatstrings1.30s 51.38% |   runtime.rawstringtmp0.37s 14.62% |   runtime.memmove
----------------------------------------------------------+-------------1.38s 50.55% |   runtime.mapdelete1.35s 49.45% |   runtime.mapaccess20.86s  1.34% 54.61%      2.73s  4.25%                | runtime.nilinterequal1.87s 68.50% |   runtime.efaceeq
----------------------------------------------------------+-------------26.82s   100% |   k8s.io/kubernetes/vendor/k8s.io/kubernetes/pkg/controller/clusterstatusupdate.(*Controller).doUpdateClusterPhasePass0.83s  1.29% 55.90%     26.82s 41.70%                | k8s.io/kubernetes/vendor/k8s.io/kubernetes/pkg/controller/clusterstatusupdate.(*Controller).syncClusterPhaseWithLease11.42s 42.58% |   k8s.io/kubernetes/vendor/k8s.io/client-go/util/workqueue.(*delayingType).AddAfter4.94s 18.42% |   k8s.io/kubernetes/vendor/k8s.io/client-go/listers/coordination/v1.leaseNamespaceLister.Get4.83s 18.01% |   time.Now1.64s  6.11% |   k8s.io/kubernetes/vendor/k8s.io/client-go/listers/mizarcore/v1alpha1.(*clusterLister).Get1.49s  5.56% |   runtime.convTstring0.89s  3.32% |   time.Time.Sub0.51s  1.90% |   time.Time.Add
----------------------------------------------------------+-------------0.40s 50.63% |   runtime.memclrHasPointers0.31s 39.24% |   runtime.(*mcentral).cacheSpan0.79s  1.23% 57.13%      0.79s  1.23%                | runtime.memclrNoHeapPointers
----------------------------------------------------------+-------------1.42s   100% |   sort.SearchFloat64s0.79s  1.23% 58.36%      1.42s  2.21%                | sort.Search0.63s 44.37% |   sort.SearchFloat64s.func1
----------------------------------------------------------+-------------0.75s   100% |   k8s.io/kubernetes/vendor/k8s.io/client-go/tools/cache.(*threadSafeMap).Get0.75s  1.17% 59.52%      0.75s  1.17%                | sync.(*RWMutex).RUnlock
----------------------------------------------------------+-------------3.04s   100% |   k8s.io/kubernetes/vendor/k8s.io/client-go/tools/cache.(*cache).GetByKey0.71s  1.10% 60.63%      3.04s  4.73%                | k8s.io/kubernetes/vendor/k8s.io/client-go/tools/cache.(*threadSafeMap).Get0.98s 32.24% |   runtime.mapaccess2_faststr0.75s 24.67% |   sync.(*RWMutex).RUnlock0.60s 19.74% |   sync.(*RWMutex).RLock (inline)
----------------------------------------------------------+-------------13.91s   100% |   k8s.io/kubernetes/vendor/k8s.io/kubernetes/pkg/controller/clusterstatusupdate.(*Controller).doUpdateClusterPhasePass0.71s  1.10% 61.73%     13.91s 21.63%                | k8s.io/kubernetes/vendor/k8s.io/client-go/util/workqueue.(*Type).Done7.02s 50.47% |   k8s.io/kubernetes/vendor/k8s.io/client-go/util/workqueue.(*defaultQueueMetrics).done2.06s 14.81% |   k8s.io/kubernetes/vendor/k8s.io/client-go/util/workqueue.set.delete1.74s 12.51% |   runtime.growslice1.53s 11.00% |   k8s.io/kubernetes/vendor/k8s.io/client-go/util/workqueue.set.has (inline)0.45s  3.24% |   sync.(*Mutex).Lock0.27s  1.94% |   sync.(*Mutex).Unlock
----------------------------------------------------------+-------------0.51s 50.00% |   k8s.io/kubernetes/vendor/k8s.io/kubernetes/pkg/controller/clusterstatusupdate.(*Controller).syncClusterPhaseWithLease0.51s 50.00% |   time.Time.Sub0.71s  1.10% 62.84%      1.02s  1.59%                | time.Time.Add
----------------------------------------------------------+-------------0.37s 55.22% |   k8s.io/kubernetes/vendor/github.com/prometheus/client_golang/prometheus.(*gauge).Inc0.30s 44.78% |   k8s.io/kubernetes/vendor/github.com/prometheus/client_golang/prometheus.(*gauge).Dec0.66s  1.03% 63.86%      0.67s  1.04%                | k8s.io/kubernetes/vendor/github.com/prometheus/client_golang/prometheus.(*gauge).Add
----------------------------------------------------------+-------------0.98s   100% |   k8s.io/kubernetes/vendor/k8s.io/client-go/tools/cache.(*threadSafeMap).Get0.66s  1.03% 64.89%      0.98s  1.52%                | runtime.mapaccess2_faststr
----------------------------------------------------------+-------------0.33s 51.56% |   k8s.io/kubernetes/vendor/k8s.io/client-go/util/workqueue.(*defaultQueueMetrics).add0.31s 48.44% |   k8s.io/kubernetes/vendor/k8s.io/client-go/util/workqueue.(*defaultRetryMetrics).retry0.64s     1% 65.88%      0.64s     1%                | k8s.io/kubernetes/vendor/github.com/prometheus/client_golang/prometheus.(*counter).Inc
----------------------------------------------------------+-------------
# 此处 调用函数 doUpdateClusterPhasePass 为 0.64 s，但后续的调用 cnum 统计时间为 26.82 秒，占用 cpu 时间较长，说明此处可能有问题，死循环之类
# 后续查看代码发现确实此处有问题，判断逻辑有问题，导致一直有 update event 进入队列等待处理，从而占用 cpu0.64s     1% 66.88%     59.53s 92.57%                | k8s.io/kubernetes/vendor/k8s.io/kubernetes/pkg/controller/clusterstatusupdate.(*Controller).doUpdateClusterPhasePass26.82s 45.05% |   k8s.io/kubernetes/vendor/k8s.io/kubernetes/pkg/controller/clusterstatusupdate.(*Controller).syncClusterPhaseWithLease15.15s 25.45% |   k8s.io/kubernetes/vendor/k8s.io/client-go/util/workqueue.(*Type).Get13.91s 23.37% |   k8s.io/kubernetes/vendor/k8s.io/client-go/util/workqueue.(*Type).Done1.73s  2.91% |   k8s.io/kubernetes/vendor/k8s.io/kubernetes/pkg/controller/clusterstatusupdate.(*Controller).handleLeaseErr1.28s  2.15% |   runtime.convTstring
----------------------------------------------------------+-------------0.63s   100% |   sort.Search0.63s  0.98% 67.86%      0.63s  0.98%                | sort.SearchFloat64s.func1
----------------------------------------------------------+-------------0.61s   100% |   runtime.mallocgc (inline)0.61s  0.95% 68.81%      0.61s  0.95%                | runtime.nextFreeFast
----------------------------------------------------------+-------------0.60s   100% |   k8s.io/kubernetes/vendor/k8s.io/client-go/tools/cache.(*threadSafeMap).Get (inline)0.60s  0.93% 69.74%      0.60s  0.93%                | sync.(*RWMutex).RLock
----------------------------------------------------------+-------------0.59s   100% |   k8s.io/kubernetes/vendor/k8s.io/client-go/util/workqueue.(*defaultQueueMetrics).sinceInSeconds (inline)0.59s  0.92% 70.66%      0.59s  0.92%                | time.Duration.Seconds
----------------------------------------------------------+-------------4.83s 52.39% |   k8s.io/kubernetes/vendor/k8s.io/kubernetes/pkg/controller/clusterstatusupdate.(*Controller).syncClusterPhaseWithLease4.39s 47.61% |   k8s.io/kubernetes/vendor/k8s.io/apimachinery/pkg/util/clock.RealClock.Now0.55s  0.86% 71.51%      9.22s 14.34%                | time.Now8.67s 94.03% |   time.now
----------------------------------------------------------+-------------1.87s   100% |   runtime.nilinterequal0.53s  0.82% 72.34%      1.87s  2.91%                | runtime.efaceeq1.19s 63.64% |   runtime.strequal
----------------------------------------------------------+-------------8.67s   100% |   time.Now0.52s  0.81% 73.15%      8.67s 13.48%                | time.now4.42s 50.98% |   runtime.walltime (inline)3.73s 43.02% |   runtime.nanotime
----------------------------------------------------------+-------------0.37s 75.51% |   runtime.concatstrings0.10s 20.41% |   runtime.typedmemmove0.49s  0.76% 73.91%      0.49s  0.76%                | runtime.memmove
----------------------------------------------------------+-------------0.48s   100% |   runtime.typehash0.48s  0.75% 74.65%      0.48s  0.75%                | runtime.strhash
----------------------------------------------------------+-------------1.79s 52.65% |   k8s.io/kubernetes/vendor/k8s.io/client-go/util/workqueue.(*defaultQueueMetrics).done1.61s 47.35% |   k8s.io/kubernetes/vendor/k8s.io/client-go/util/workqueue.(*defaultQueueMetrics).get0.47s  0.73% 75.38%      3.40s  5.29%                | k8s.io/kubernetes/vendor/k8s.io/client-go/util/workqueue.(*defaultQueueMetrics).sinceInSeconds2.33s 68.53% |   time.Since0.59s 17.35% |   time.Duration.Seconds (inline)
----------------------------------------------------------+-------------0.48s 94.12% |   runtime.memclrHasPointers0.46s  0.72% 76.10%      0.51s  0.79%                | runtime.bulkBarrierPreWrite
----------------------------------------------------------+-------------10.32s   100% |   k8s.io/kubernetes/vendor/k8s.io/client-go/util/workqueue.(*Type).Get0.45s   0.7% 76.80%     10.32s 16.05%                | k8s.io/kubernetes/vendor/k8s.io/client-go/util/workqueue.(*defaultQueueMetrics).get2.08s 20.16% |   k8s.io/kubernetes/vendor/k8s.io/apimachinery/pkg/util/clock.RealClock.Now1.63s 15.79% |   k8s.io/kubernetes/vendor/github.com/prometheus/client_golang/prometheus.(*histogram).Observe1.61s 15.60% |   k8s.io/kubernetes/vendor/k8s.io/client-go/util/workqueue.(*defaultQueueMetrics).sinceInSeconds1.41s 13.66% |   runtime.mapdelete1.40s 13.57% |   runtime.mapaccess21.36s 13.18% |   runtime.mapassign0.38s  3.68% |   k8s.io/kubernetes/vendor/github.com/prometheus/client_golang/prometheus.(*gauge).Dec
----------------------------------------------------------+-------------0.65s   100% |   runtime.mallocgc0.45s   0.7% 77.50%      0.65s  1.01%                | runtime.heapBitsSetType
----------------------------------------------------------+-------------1.44s   100% |   k8s.io/kubernetes/vendor/k8s.io/client-go/util/workqueue.(*MaxOfRateLimiter).Forget0.44s  0.68% 78.18%      1.44s  2.24%                | k8s.io/kubernetes/vendor/k8s.io/client-go/util/workqueue.(*ItemExponentialFailureRateLimiter).Forget0.76s 52.78% |   runtime.mapdelete0.23s 15.97% |   sync.(*Mutex).Unlock
----------------------------------------------------------+-------------0.44s   100% |   runtime.nanotime0.44s  0.68% 78.87%      0.44s  0.68%                | runtime.nanotime1
----------------------------------------------------------+-------------15.15s   100% |   k8s.io/kubernetes/vendor/k8s.io/kubernetes/pkg/controller/clusterstatusupdate.(*Controller).doUpdateClusterPhasePass0.41s  0.64% 79.51%     15.15s 23.56%                | k8s.io/kubernetes/vendor/k8s.io/client-go/util/workqueue.(*Type).Get10.32s 68.12% |   k8s.io/kubernetes/vendor/k8s.io/client-go/util/workqueue.(*defaultQueueMetrics).get1.99s 13.14% |   k8s.io/kubernetes/vendor/k8s.io/client-go/util/workqueue.set.delete (inline)1.68s 11.09% |   k8s.io/kubernetes/vendor/k8s.io/client-go/util/workqueue.set.insert (inline)0.41s  2.71% |   sync.(*Mutex).Lock0.34s  2.24% |   sync.(*Mutex).Unlock
----------------------------------------------------------+-------------0.54s   100% |   runtime.mapassign0.41s  0.64% 80.14%      0.54s  0.84%                | runtime.typedmemmove0.10s 18.52% |   runtime.memmove
----------------------------------------------------------+-------------1.97s 57.27% |   k8s.io/kubernetes/vendor/k8s.io/client-go/listers/coordination/v1.leaseNamespaceLister.Get1.47s 42.73% |   k8s.io/kubernetes/vendor/k8s.io/client-go/listers/mizarcore/v1alpha1.(*clusterLister).Get0.40s  0.62% 80.77%      3.44s  5.35%                | k8s.io/kubernetes/vendor/k8s.io/client-go/tools/cache.(*cache).GetByKey3.04s 88.37% |   k8s.io/kubernetes/vendor/k8s.io/client-go/tools/cache.(*threadSafeMap).Get
----------------------------------------------------------+-------------0.89s 82.41% |   k8s.io/kubernetes/vendor/k8s.io/kubernetes/pkg/controller/clusterstatusupdate.(*Controller).syncClusterPhaseWithLease0.19s 17.59% |   time.Since0.40s  0.62% 81.39%      1.08s  1.68%                | time.Time.Sub0.51s 47.22% |   time.Time.Add
----------------------------------------------------------+-------------0.39s   100% |   runtime.walltime0.39s  0.61% 81.99%      0.39s  0.61%                | runtime.walltime1
----------------------------------------------------------+-------------0.39s 84.78% |   runtime.scanobject0.38s  0.59% 82.58%      0.46s  0.72%                | runtime.findObject
----------------------------------------------------------+-------------0.29s 78.38% |   runtime.strequal0.37s  0.58% 83.16%      0.37s  0.58%                | runtime.memequal
----------------------------------------------------------+-------------1.22s   100% |   runtime.mapdelete0.34s  0.53% 83.69%      1.22s  1.90%                | runtime.memclrHasPointers0.48s 39.34% |   runtime.bulkBarrierPreWrite0.40s 32.79% |   runtime.memclrNoHeapPointers
----------------------------------------------------------+-------------4.94s   100% |   k8s.io/kubernetes/vendor/k8s.io/kubernetes/pkg/controller/clusterstatusupdate.(*Controller).syncClusterPhaseWithLease0.31s  0.48% 84.17%      4.94s  7.68%                | k8s.io/kubernetes/vendor/k8s.io/client-go/listers/coordination/v1.leaseNamespaceLister.Get2.66s 53.85% |   runtime.concatstring31.97s 39.88% |   k8s.io/kubernetes/vendor/k8s.io/client-go/tools/cache.(*cache).GetByKey
----------------------------------------------------------+-------------1.16s   100% |   k8s.io/kubernetes/vendor/k8s.io/client-go/util/workqueue.(*delayingType).AddAfter0.31s  0.48% 84.65%      1.16s  1.80%                | k8s.io/kubernetes/vendor/k8s.io/client-go/util/workqueue.(*Type).ShuttingDown0.48s 41.38% |   sync.(*Mutex).Unlock0.37s 31.90% |   sync.(*Mutex).Lock
----------------------------------------------------------+-------------5.29s   100% |   k8s.io/kubernetes/vendor/k8s.io/client-go/util/workqueue.(*Type).Add0.30s  0.47% 85.12%      5.29s  8.23%                | k8s.io/kubernetes/vendor/k8s.io/client-go/util/workqueue.(*defaultQueueMetrics).add2.37s 44.80% |   k8s.io/kubernetes/vendor/k8s.io/apimachinery/pkg/util/clock.RealClock.Now1.41s 26.65% |   runtime.mapassign0.44s  8.32% |   k8s.io/kubernetes/vendor/github.com/prometheus/client_golang/prometheus.(*gauge).Inc0.43s  8.13% |   runtime.mapaccess20.33s  6.24% |   k8s.io/kubernetes/vendor/github.com/prometheus/client_golang/prometheus.(*counter).Inc
----------------------------------------------------------+-------------1.49s 53.79% |   k8s.io/kubernetes/vendor/k8s.io/kubernetes/pkg/controller/clusterstatusupdate.(*Controller).syncClusterPhaseWithLease1.28s 46.21% |   k8s.io/kubernetes/vendor/k8s.io/kubernetes/pkg/controller/clusterstatusupdate.(*Controller).doUpdateClusterPhasePass0.30s  0.47% 85.59%      2.77s  4.31%                | runtime.convTstring2.47s 89.17% |   runtime.mallocgc
----------------------------------------------------------+-------------2.33s   100% |   k8s.io/kubernetes/vendor/k8s.io/client-go/util/workqueue.(*defaultQueueMetrics).sinceInSeconds0.29s  0.45% 86.04%      2.33s  3.62%                | time.Since1.85s 79.40% |   runtime.nanotime0.19s  8.15% |   time.Time.Sub
----------------------------------------------------------+-------------7.02s   100% |   k8s.io/kubernetes/vendor/k8s.io/client-go/util/workqueue.(*Type).Done0.26s   0.4% 86.44%      7.02s 10.92%                | k8s.io/kubernetes/vendor/k8s.io/client-go/util/workqueue.(*defaultQueueMetrics).done2.34s 33.33% |   k8s.io/kubernetes/vendor/github.com/prometheus/client_golang/prometheus.(*histogram).Observe1.79s 25.50% |   k8s.io/kubernetes/vendor/k8s.io/client-go/util/workqueue.(*defaultQueueMetrics).sinceInSeconds1.48s 21.08% |   runtime.mapdelete1.15s 16.38% |   runtime.mapaccess2
----------------------------------------------------------+-------------11.42s   100% |   k8s.io/kubernetes/vendor/k8s.io/kubernetes/pkg/controller/clusterstatusupdate.(*Controller).syncClusterPhaseWithLease0.25s  0.39% 86.83%     11.42s 17.76%                | k8s.io/kubernetes/vendor/k8s.io/client-go/util/workqueue.(*delayingType).AddAfter9.66s 84.59% |   k8s.io/kubernetes/vendor/k8s.io/client-go/util/workqueue.(*Type).Add1.16s 10.16% |   k8s.io/kubernetes/vendor/k8s.io/client-go/util/workqueue.(*Type).ShuttingDown0.35s  3.06% |   k8s.io/kubernetes/vendor/k8s.io/client-go/util/workqueue.(*defaultRetryMetrics).retry
----------------------------------------------------------+-------------9.66s   100% |   k8s.io/kubernetes/vendor/k8s.io/client-go/util/workqueue.(*delayingType).AddAfter0.22s  0.34% 87.17%      9.66s 15.02%                | k8s.io/kubernetes/vendor/k8s.io/client-go/util/workqueue.(*Type).Add5.29s 54.76% |   k8s.io/kubernetes/vendor/k8s.io/client-go/util/workqueue.(*defaultQueueMetrics).add2.03s 21.01% |   k8s.io/kubernetes/vendor/k8s.io/client-go/util/workqueue.set.has (inline)1.43s 14.80% |   k8s.io/kubernetes/vendor/k8s.io/client-go/util/workqueue.set.insert (inline)0.36s  3.73% |   sync.(*Mutex).Unlock0.33s  3.42% |   sync.(*Mutex).Lock
----------------------------------------------------------+-------------0.80s 91.95% |   runtime.gcDrain0.07s  8.05% |   runtime.mallocgc0.22s  0.34% 87.51%      0.87s  1.35%                | runtime.gentraceback0.07s  8.05% |   runtime.greyobject
----------------------------------------------------------+-------------1.74s   100% |   k8s.io/kubernetes/vendor/k8s.io/client-go/util/workqueue.(*Type).Done0.22s  0.34% 87.86%      1.74s  2.71%                | runtime.growslice1.43s 82.18% |   runtime.mallocgc
----------------------------------------------------------+-------------2.34s 58.94% |   k8s.io/kubernetes/vendor/k8s.io/client-go/util/workqueue.(*defaultQueueMetrics).done1.63s 41.06% |   k8s.io/kubernetes/vendor/k8s.io/client-go/util/workqueue.(*defaultQueueMetrics).get0.17s  0.26% 88.12%      3.97s  6.17%                | k8s.io/kubernetes/vendor/github.com/prometheus/client_golang/prometheus.(*histogram).Observe2.11s 53.15% |   k8s.io/kubernetes/vendor/github.com/prometheus/client_golang/prometheus.(*histogram).observe1.69s 42.57% |   k8s.io/kubernetes/vendor/github.com/prometheus/client_golang/prometheus.(*histogram).findBucket
----------------------------------------------------------+-------------1.64s   100% |   k8s.io/kubernetes/vendor/k8s.io/kubernetes/pkg/controller/clusterstatusupdate.(*Controller).syncClusterPhaseWithLease0.17s  0.26% 88.38%      1.64s  2.55%                | k8s.io/kubernetes/vendor/k8s.io/client-go/listers/mizarcore/v1alpha1.(*clusterLister).Get1.47s 89.63% |   k8s.io/kubernetes/vendor/k8s.io/client-go/tools/cache.(*cache).GetByKey
----------------------------------------------------------+-------------1.61s   100% |   k8s.io/kubernetes/vendor/k8s.io/client-go/util/workqueue.(*rateLimitingType).Forget0.17s  0.26% 88.65%      1.61s  2.50%                | k8s.io/kubernetes/vendor/k8s.io/client-go/util/workqueue.(*MaxOfRateLimiter).Forget1.44s 89.44% |   k8s.io/kubernetes/vendor/k8s.io/client-go/util/workqueue.(*ItemExponentialFailureRateLimiter).Forget
----------------------------------------------------------+-------------1.59s   100% |   k8s.io/kubernetes/vendor/github.com/prometheus/client_golang/prometheus.(*histogram).findBucket0.17s  0.26% 88.91%      1.59s  2.47%                | sort.SearchFloat64s1.42s 89.31% |   sort.Search
----------------------------------------------------------+-------------2.66s   100% |   k8s.io/kubernetes/vendor/k8s.io/client-go/listers/coordination/v1.leaseNamespaceLister.Get0.13s   0.2% 89.12%      2.66s  4.14%                | runtime.concatstring32.53s 95.11% |   runtime.concatstrings
----------------------------------------------------------+-------------2.03s 57.02% |   k8s.io/kubernetes/vendor/k8s.io/client-go/util/workqueue.(*Type).Add (inline)1.53s 42.98% |   k8s.io/kubernetes/vendor/k8s.io/client-go/util/workqueue.(*Type).Done (inline)0.12s  0.19% 89.30%      3.56s  5.54%                | k8s.io/kubernetes/vendor/k8s.io/client-go/util/workqueue.set.has3.44s 96.63% |   runtime.mapaccess2
----------------------------------------------------------+-------------0.12s  0.19% 89.49%      3.70s  5.75%                | runtime.gcDrain2.59s 70.00% |   runtime.scanobject0.80s 21.62% |   runtime.gentraceback
----------------------------------------------------------+-------------1.69s   100% |   k8s.io/kubernetes/vendor/github.com/prometheus/client_golang/prometheus.(*histogram).Observe0.10s  0.16% 89.64%      1.69s  2.63%                | k8s.io/kubernetes/vendor/github.com/prometheus/client_golang/prometheus.(*histogram).findBucket1.59s 94.08% |   sort.SearchFloat64s
----------------------------------------------------------+-------------1.68s 54.02% |   k8s.io/kubernetes/vendor/k8s.io/client-go/util/workqueue.(*Type).Get (inline)1.43s 45.98% |   k8s.io/kubernetes/vendor/k8s.io/client-go/util/workqueue.(*Type).Add (inline)0.10s  0.16% 89.80%      3.11s  4.84%                | k8s.io/kubernetes/vendor/k8s.io/client-go/util/workqueue.set.insert3.01s 96.78% |   runtime.mapassign
----------------------------------------------------------+-------------2.06s 50.86% |   k8s.io/kubernetes/vendor/k8s.io/client-go/util/workqueue.(*Type).Done1.99s 49.14% |   k8s.io/kubernetes/vendor/k8s.io/client-go/util/workqueue.(*Type).Get (inline)0.09s  0.14% 89.94%      4.05s  6.30%                | k8s.io/kubernetes/vendor/k8s.io/client-go/util/workqueue.set.delete3.96s 97.78% |   runtime.mapdelete
----------------------------------------------------------+-------------0.38s   100% |   k8s.io/kubernetes/vendor/k8s.io/client-go/util/workqueue.(*defaultQueueMetrics).get0.08s  0.12% 90.06%      0.38s  0.59%                | k8s.io/kubernetes/vendor/github.com/prometheus/client_golang/prometheus.(*gauge).Dec0.30s 78.95% |   k8s.io/kubernetes/vendor/github.com/prometheus/client_golang/prometheus.(*gauge).Add
----------------------------------------------------------+-------------1.69s   100% |   k8s.io/kubernetes/vendor/k8s.io/kubernetes/pkg/controller/clusterstatusupdate.(*Controller).handleLeaseErr0.08s  0.12% 90.19%      1.69s  2.63%                | k8s.io/kubernetes/vendor/k8s.io/client-go/util/workqueue.(*rateLimitingType).Forget1.61s 95.27% |   k8s.io/kubernetes/vendor/k8s.io/client-go/util/workqueue.(*MaxOfRateLimiter).Forget
----------------------------------------------------------+-------------0.41s 83.67% |   runtime.scanobject0.07s 14.29% |   runtime.gentraceback0.08s  0.12% 90.31%      0.49s  0.76%                | runtime.greyobject
----------------------------------------------------------+-------------1.24s   100% |   runtime.rawstringtmp0.08s  0.12% 90.44%      1.24s  1.93%                | runtime.rawstring1.16s 93.55% |   runtime.mallocgc
----------------------------------------------------------+-------------0.44s   100% |   k8s.io/kubernetes/vendor/k8s.io/client-go/util/workqueue.(*defaultQueueMetrics).add0.07s  0.11% 90.55%      0.44s  0.68%                | k8s.io/kubernetes/vendor/github.com/prometheus/client_golang/prometheus.(*gauge).Inc0.37s 84.09% |   k8s.io/kubernetes/vendor/github.com/prometheus/client_golang/prometheus.(*gauge).Add
----------------------------------------------------------+-------------2.37s 53.26% |   k8s.io/kubernetes/vendor/k8s.io/client-go/util/workqueue.(*defaultQueueMetrics).add2.08s 46.74% |   k8s.io/kubernetes/vendor/k8s.io/client-go/util/workqueue.(*defaultQueueMetrics).get0.06s 0.093% 90.64%      4.45s  6.92%                | k8s.io/kubernetes/vendor/k8s.io/apimachinery/pkg/util/clock.RealClock.Now4.39s 98.65% |   time.Now
----------------------------------------------------------+-------------0.69s   100% |   runtime.mallocgc0.06s 0.093% 90.73%      0.69s  1.07%                | runtime.(*mcentral).cacheSpan0.31s 44.93% |   runtime.memclrNoHeapPointers
----------------------------------------------------------+-------------1.30s   100% |   runtime.concatstrings0.06s 0.093% 90.83%      1.30s  2.02%                | runtime.rawstringtmp1.24s 95.38% |   runtime.rawstring
----------------------------------------------------------+-------------0.35s   100% |   k8s.io/kubernetes/vendor/k8s.io/client-go/util/workqueue.(*delayingType).AddAfter0.04s 0.062% 90.89%      0.35s  0.54%                | k8s.io/kubernetes/vendor/k8s.io/client-go/util/workqueue.(*defaultRetryMetrics).retry0.31s 88.57% |   k8s.io/kubernetes/vendor/github.com/prometheus/client_golang/prometheus.(*counter).Inc
----------------------------------------------------------+-------------1.73s   100% |   k8s.io/kubernetes/vendor/k8s.io/kubernetes/pkg/controller/clusterstatusupdate.(*Controller).doUpdateClusterPhasePass0.04s 0.062% 90.95%      1.73s  2.69%                | k8s.io/kubernetes/vendor/k8s.io/kubernetes/pkg/controller/clusterstatusupdate.(*Controller).handleLeaseErr1.69s 97.69% |   k8s.io/kubernetes/vendor/k8s.io/client-go/util/workqueue.(*rateLimitingType).Forget
----------------------------------------------------------+-------------

【k8s 开发排错】k8s组件开发排错之pprof

参考 Kubernetes组件问题排查的一些方法 - 知乎 go 程序性能调优 pprof 的使用 （一） - 润新知 Go进阶系列之性能分析神器pprof__好吗_好的的博客-CSDN博客 k8s各组件端口_k8s10259端口-CSDN博客 Go调试神器pprof使用教程【实战分享】_NPE~的博客-C…...

编程日记 2023/10/15 19:24:26

记录一次典型oom的处理过程

背景有同学反馈收到应用RT的报警，其中的流量都来自于网关集群中的一台机器。因为负责网关，就上去看了下并进行排查。整体是一个比较明显的oom，这里只是记录下排查过程，老司机可以略过了。初步现象常规步骤，使用t…...

编程日记 2023/10/15 19:23:25

centos离线安装telnet、traceroute工具

安装包下载地址安装包下载地址在这里直接输入包名，筛选系统，根据自己系统版本确定该下哪个包 centos离线安装telnet 准备三个安装包 xinetd-2.3.15-14.el7.x86_64.rpmtelnet-server-0.17-65.el7_8.x86_64.rpmtelnet-0.17-65.el7_8.x86_64.rpm 三个…...

编程日记 2023/10/15 19:22:24

【java学习—七】对象的实例化过程（33）

文章目录 1. 简单类对象的实例化过程2. 子类对象的实例化过程 1. 简单类对象的实例化过程 2. 子类对象的实例化过程...

编程日记 2023/10/15 19:21:23

P4451 [国家集训队] 整数的lqp拆分

传送门:洛谷解题思路: 考虑设 f ( i ) f(i) f(i)为和为 i i i的拆分权值和,那么我们可以得到一个递推关系式 f ( i ) ∑ i 1 n f ( n − i ) ∗ f i b ( i ) f(i)\sum_{i1}^nf(n-i)*fib(i) f(i)i1∑nf(n−i)∗fib(i)这个表达式的含义就是枚举一个数的值,由于分配率,我们…...

编程日记 2023/10/15 19:19:19

索引操作加联合组件： ALTER TABLE dws_stock_age_material_transactions_total_pri_rpt_update ADD INDEX index_sio (organization_id(16),item_code,subinventory_code); 查看索引： SHOW INDEX FROM dws_stock_age_material_transactions_detail_…...

编程日记 2023/10/15 19:18:18

可视化上证50结构图

可视化上证50结构图缘由收集数据先获取50支成分股列表获取各成分股票K线数据数据处理找出来，再删除，然后重新下载数据最终获得每日报价的变化值图形结构处理聚类分析使用affinity_propagation(亲和传播)聚类嵌入二维平面空间可视化小结热力图缘由 …...

编程日记 2023/10/15 19:17:17

STM32_PID通用算法增量式和位置式

STM32_PID通用算法增量式和位置式前言： 此算法为入门级PID算法，调试好参数后可应用于温度控制、舵机控制、直流电机的转速控制和直流电机的角度控制等等，下面就以温度控制举例 pid.c #include "pid.h" #include "sensor.h&q…...

编程日记 2023/10/15 19:16:15

Spark的数据输入、数据计算、数据输出

PySpark的编程，主要氛围三大步骤：1）数据输入、2）数据处理计算、3）数据输出 1）数据输入:通过SparkContext对象，晚上数据输入 2）数据处理计算:输入数据后得到RDD对象，对RDD…...

编程日记 2023/10/15 19:15:14

Windows端口号被占用的查看方法及解决办法

Windows端口号被占用的查看方法及解决办法 Error starting ApplicationContext. To display the conditions report re-run your application with debug enabled. 2023-10-14 22:58:32.069 ERROR 6488 --- [ main] o.s.b.d.LoggingFailureAnalysisReporter : ***…...

编程日记 2023/10/15 19:14:14

Web3 整理React项目导入Web3 并获取区块链信息

上文 WEB3 创建React前端Dapp环境并整合solidity项目，融合项目结构便捷前端拿取合约 Abi 我们用react 创建了一个 dapp 项目并将前后端代码做了个整合那么我们就来好好整理一下我们的前端react的项目结构我们在 src 目录下创建一个 components 用来存放我们的…...

编程日记 2023/10/15 19:13:12

基于SpringBoot的旅游网站开题报告

一、选题背景随着旅游业的蓬勃发展和人们对旅游需求的增长，开发一个基于Spring Boot的旅游网站具有重要的意义。传统的旅行社模式逐渐不能满足人们个性化、多样化的旅游需求，因此开发一个在线旅游网站能够为用户提供更加便捷、灵活、个性化的旅游服务&…...

编程日记 2023/10/15 19:12:11

基于SSM的班级事务管理系统

基于SSM的班级事务管理系统开发语言：Java数据库：MySQL技术：SpringSpringMVCMyBatisVue工具：IDEA/Ecilpse、Navicat、Maven 系统展示前台界面登录界面班委界面学生界面管理员界面摘要基于SSM（Spring、Spring…...

编程日记 2023/10/15 19:09:05

基于Spring Boot开发的汽车租赁管理系统

文章目录项目介绍主要功能截图：后台前台部分代码展示设计总结项目获取方式🍅 作者主页：超级无敌暴龙战士塔塔开 🍅 简介：Java领域优质创作者🏆、简历模板、学习资料、面试题库【关注我，都给你】 🍅文末获取源码联系🍅 项目介绍基于Spring Boot开发的汽车租赁…...

编程日记 2023/10/15 19:08:04

精品基于django的高校竞赛比赛管理系统Python

《[含文档PPT源码等]精品基于django的高校竞赛管理系统》该项目含有源码、文档、PPT、配套开发软件、软件安装教程、项目发布教程等！ 软件开发环境及开发工具： 开发语言：python 使用框架：Django 前端技术：JavaScri…...

编程日记 2023/10/15 19:06:01

RustDay04------Exercise[01-10]

1.做题须知这一题告诉我们可以尝试修改下面的输出,在觉得OK之后删除// I AM NOT DONE注释即可进入下一题 // intro1.rs // About this I AM NOT DONE thing: // We sometimes encourage you to keep trying things on a given exercise, even // after you already figured …...

编程日记 2023/10/15 19:05:00

ARM day9

src/key_it.c #include "key_it.h" #include "led.h" void key_it_config() {//RCC使能GPIOF时钟RCC->MP_AHB4ENSETR | (0x1<<5);//设置PF9 PF7 PF8GPIO输入//PF9GPIOF->MODER & (~(0x3<<18));//PF8GPIOF->MODER & (~(0x3&l…...

编程日记 2023/10/15 19:03:59

【TensorFlow2 之013】TensorFlow-Lite

一、说明在这篇文章中，我们将展示如何构建计算机视觉模型并准备将其部署在移动和嵌入式设备上。有了这些知识，您就可以真正将脚本部署到日常使用或移动应用程序中。教程概述： 介绍在 TensorFlow 中构建模型将模型转换为 TensorFlow Lite训练…...

编程日记 2023/10/15 19:02:58

Java基础--阳光总在风雨后，请相信彩虹

1、今日任务 JAVA SE-韩顺平视频教程–30p以上（今天得50p以上因为是基础）计算机基础八股记忆总结刷题（两题）可以先用python 1、SSM ssm->Spring（轻量级的文本开发框架）/SpringMVC（分层的w…...

编程日记 2023/10/15 19:01:57

高级网络调试技巧：使用Charles Proxy捕获和修改HTTP/HTTPS请求

今天我将与大家分享一种强大的网络调试技巧，那就是使用Charles Proxy来捕获和修改HTTP/HTTPS请求。如果您是一位开发人员或者网络调试爱好者，那么这个工具肯定对您有着很大的帮助。接下来，让我们一起来学习如何使用Charles Proxy进行高级网络…...

编程日记 2023/10/15 19:00:56

【磁盘】每天掌握一个Linux命令 - iostat

目录【磁盘】每天掌握一个Linux命令 - iostat工具概述安装方式核心功能基础用法进阶操作实战案例面试题场景生产场景注意事项【磁盘】每天掌握一个Linux命令 - iostat 工具概述 iostat（I/O Statistics）是Linux系统下用于监视系统输入输出设备和CPU使…...

编程新知 2025/9/30 16:39:11

多模态商品数据接口：融合图像、语音与文字的下一代商品详情体验

一、多模态商品数据接口的技术架构 （一）多模态数据融合引擎跨模态语义对齐通过Transformer架构实现图像、语音、文字的语义关联。例如，当用户上传一张“蓝色连衣裙”的图片时，接口可自动提取图像中的颜色（RGB值&…...

编程新知 2025/7/23 3:55:49

C# SqlSugar：依赖注入与仓储模式实践

C# SqlSugar：依赖注入与仓储模式实践在 C# 的应用开发中，数据库操作是必不可少的环节。为了让数据访问层更加简洁、高效且易于维护，许多开发者会选择成熟的 ORM（对象关系映射）框架，SqlSugar 就是其中备受…...

编程新知 2025/11/25 6:49:02

JDK 17 新特性

#JDK 17 新特性 /**************** 文本块 *****************/ python/scala中早就支持，不稀奇 String json “”" { “name”: “Java”, “version”: 17 } “”"; /**************** Switch 语句 -> 表达式 *****************/ 挺好的&#xff…...

编程新知 2026/1/29 5:34:29

Device Mapper 机制

Device Mapper 机制详解 Device Mapper（简称 DM）是 Linux 内核中的一套通用块设备映射框架，为 LVM、加密磁盘、RAID 等提供底层支持。本文将详细介绍 Device Mapper 的原理、实现、内核配置、常用工具、操作测试流程，并配以详细的…...

编程新知 2025/12/14 13:11:33

保姆级教程：在无网络无显卡的Windows电脑的vscode本地部署deepseek

文章目录 1 前言2 部署流程2.1 准备工作2.2 Ollama2.2.1 使用有网络的电脑下载Ollama2.2.2 安装Ollama（有网络的电脑）2.2.3 安装Ollama（无网络的电脑）2.2.4 安装验证2.2.5 修改大模型安装位置2.2.6 下载Deepseek模型 2.3 将deepse…...

编程新知 2026/2/6 16:59:24

【Post-process】【VBA】ETABS VBA FrameObj.GetNameList and write to EXCEL

ETABS API实战：导出框架元素数据到Excel 在结构工程师的日常工作中，经常需要从ETABS模型中提取框架元素信息进行后续分析。手动复制粘贴不仅耗时，还容易出错。今天我们来用简单的VBA代码实现自动化导出。 🎯 我们要实现什么？一键点击，就能将ETABS中所有框架元素的基…...

编程新知 2026/2/6 5:51:08

2025年低延迟业务DDoS防护全攻略：高可用架构与实战方案

一、延迟敏感行业面临的DDoS攻击新挑战 2025年，金融交易、实时竞技游戏、工业物联网等低延迟业务成为DDoS攻击的首要目标。攻击呈现三大特征： AI驱动的自适应攻击：攻击流量模拟真实用户行为，差异率低至0.5%，传统规则引…...

编程新知 2025/8/29 1:00:19

新版NANO下载烧录过程

一、序言搭建 Jetson 系列产品烧录系统的环境需要在电脑主机上安装 Ubuntu 系统。此处使用 18.04 LTS。二、环境搭建 1、安装库 $ sudo apt-get install qemu-user-static$ sudo apt-get install python 搭建环境的过程需要这个应用库来将某些 NVIDIA 软件组件安装到 Je…...

编程新知 2026/1/22 21:54:45

20250609在荣品的PRO-RK3566开发板的Android13下解决串口可以执行命令但是脚本执行命令异常的问题

20250609在荣品的PRO-RK3566开发板的Android13下解决串口可以执行命令但是脚本执行命令异常的问题 2025/6/9 20:54 缘起，为了跨网段推流，千辛万苦配置好了网络参数。但是命令iptables -t filter -F tetherctrl_FORWARD可以在调试串口/DEBUG口正确执行。…...

编程新知 2026/2/1 12:22:07

参考