测试数据生成

 要生成300亿的文本数据，刚开始用python，实在是太慢了，改成c后速度提升了10几倍，看来干大事还是不能用python。代码留一下，以后可能还可以用上。

#include <stdio.h>
#include <stdlib.h>
#include <time.h>int main(int argc, char *argv[])
{if (argc != 4){printf("[%d]o.exe filename startnum endnum \n",argc);return 1;}srand((unsigned)time(NULL));FILE* pf;char* filename = argv[1];pf = fopen(filename,"w");if (pf != NULL){long i = strtoul(argv[2],NULL,0);long e = strtoul(argv[3],NULL,0);for (;i<=e;i++){double r = ((double)rand() / RAND_MAX) *10000000000;int r1 = rand()%10;fprintf(pf,"INDEXA%ld,2023-08-25,ORG%d,%10.3F\n",i,r1,r);//printf("2023-08-24,INDEXA%ld,ORG%d,%10.3F\n",i,r1,r);}fclose(pf);}return 0;
}

#编译
gcc gen.c#生成300亿行数据
./a.out imp.csv 1 300000000000