Simple program to test fork() performance.
#include <sys/signal.h>
#include <sys/time.h>
int main(int argc, char *argv[])
{
int pid;
int i = 0, max = 100000;
struct timeval tv0, tv1;
struct timezone tz;
long diff;
if (argc >= 2)
max = atoi(argv[1]);
signal(SIGCHLD, SIG_IGN);
gettimeofday(&tv0, &tz);
while (i++ < max) {
pid = fork();
if (pid == 0) {
sleep(1);
exit (0);
}
}
gettimeofday(&tv1, &tz);
diff = (tv1.tv_sec - tv0.tv_sec)*1000000 + (tv1.tv_usec - tv0.tv_usec);
printf("Average per process fork+exit time is %ld usecs [diff=%lu,
max=%d].\n", diff/max, diff, max);
return 0;
}
Creating 10k forks 100 times.
Results on 2-way SMP(1+1HT) Xeon for one fork()+exit():
2.6.11-rc4-mm1 494 usec
2.6.11-rc4-mm1-fork-connector-no_userspace 509 usec
2.6.11-rc4-mm1-fork-connector-userspace 520 usec
5% fork() degradation(connector with userspace vs. vanilla) with fork()
connector.
On my test system global fork lock does not cost anything
(tested both with and without userspace listener), but it is only 2-way(pseudo).
--
Evgeniy Polyakov
Crash is better than data corruption -- Arthur Grabowski
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