On Wednesday 16 August 2006 01:12, Robert Hancock wrote:
> Irfan Habib wrote:
> > Hi,
> >
> > What is the maximum number of process which can run simultaneously in
> > linux? I need to create an application which requires 40,000 threads.
> > I was testing with far fewer numbers than that, I was getting
> > exceptions in pthread_create
>
> What architecture is this? On a 32-bit architecture with a 2MB stack
> size (which I think is the default) you couldn't possibly create more
> than 2048 threads just because of stack space requirements. Reducing the
> stack size would get you more.
Hm, I'm on a 4way PPC64 machine with 2.5G RAM.
It can only create 509 pthreads and fails with ENOMEM
on the 510th.
That's not a really big machine, but I expected it to be able
to create somewhere around 8000 threads or so, at least. Especially
as it has a 64bit kernel and lots of memory.
Well...
That's my test app:
#include <stdio.h>
#include <pthread.h>
#include <string.h>
#include <errno.h>
static void * thread(void *arg)
{
while (1)
sleep(10);
}
int main(void)
{
int err = 0;
unsigned long i = 0;
pthread_t t;
while (!err) {
err = pthread_create(&t, NULL, thread, NULL);
i++;
if (err) {
printf("Creating pthread %lu failed with \"%s\"\n",
i, strerror(errno));
break;
}
printf("%lu pthreads created\n", i);
}
return 0;
}
--
Greetings Michael.
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