多进程和多线程信能测试
创建然后终止进程50000次
创建进程代码
// fork.c #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <sys/wait.h> #define NFORKS 50000 void do_nothing() { int i; i= 0; } int main(int argc, char *argv[]) { int pid, i, status; for (i=0; i<NFORKS; i++) { /*** error handling ***/ if ((pid = fork()) < 0 ) { printf ("fork failed with error code= %d\n", pid); exit(0); } /*** this is the child of the fork ***/ else if (pid ==0) { do_nothing(); exit(0); } /*** this is the parent of the fork ***/ else { waitpid(pid, &status, 0); } } exit(0); } |
创建线程代码
创建然后终止线程50000次
// pthread_create.c #include <pthread.h> #include <stdio.h> #include <stdlib.h> #define NTHREADS 50000 void *do_nothing(void *null) { int i; i=0; pthread_exit(NULL); } int main(int argc, char *argv[]) { int rc, i; pthread_t tid; for (i=0; i<NTHREADS; i++) { rc = pthread_create(&tid, NULL, do_nothing, NULL); if (rc) { printf("ERROR; return code from pthread_create() is %d\n", rc); exit(-1); } /* Wait for the thread */ rc = pthread_join(tid, NULL); if (rc) { printf("ERROR; return code from pthread_join() is %d\n", rc); exit(-1); } } pthread_exit(NULL); } |
编译
gcc fork.c -o fork -Wall
gcc pthread_create.c -o pthread_create -Wall
执行
测试环境信息
$ cat /proc/cpuinfo | grep name | uniq
model name: AMD Athlon(tm) 64 X2 Dual Core Processor 5200+
$ uname -a
Linux Mint 3.16.0-36-generic #48~14.04.1-Ubuntu SMP Wed Apr 15 13:11:28 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
测试进程创建然后销毁的时间
$ time ./fork
real0m12.539s
user0m0.124s
sys0m13.070s
测试线程创建然后销毁的时间
$ time ./pthread_create
real0m1.995s
user0m0.503s
sys0m1.821s
