Re: Maximum number of processes in Linux

["linux-os \(Dick Johnson\)" <linux-os@analogic.com>]

On Tue, 15 Aug 2006, Willy Tarreau wrote:

> On Tue, Aug 15, 2006 at 02:22:02PM -0400, linux-os (Dick Johnson) wrote:
>>
>> On Tue, 15 Aug 2006, 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
>>>
>>> Regards
>>> Irfan
>>
>> #include <stdio.h>
>> int main(){
>>      unsigned long i;
>       ^^^^^^^^^^^^^^^^
>
>>      while(fork() != -1)
>>          i++;
>>      printf("%u\n", i);
>>      return 0;
>> }
>> $ gcc -o xxx xxx.c
>> $ ./xxx
>>
>> 1251392833         <<---- At least this number
>
> Dick, would you please initialize your local variables when you send
> examples like this ? You should have been amazed by one billion processes
> on your box, at least.

Yep. I discovered it just as I hit the ^X button!


>
>> 1251392834
>> 1251392834
>> 1251392834
>> 1251392834
>> 1251392833
>> 1251392833
>> 1251392834
>> 1251392834
>> 1251392834
>> ^C
>> $ killall xxx
>>
>> BYW 40,000 threads? 40,000 tasks all sharing the same address space?
>> Hopefully this is just a training exercise to see if it's possible.
>>
>> Cheers,
>> Dick Johnson
>> Penguin : Linux version 2.6.16.24 on an i686 machine (5592.62 BogoMips).
>> New book: http://www.AbominableFirebug.com/
>
> Regards,
> Willy
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Cheers,
Dick Johnson
Penguin : Linux version 2.6.16.24 on an i686 machine (5592.62 BogoMips).
New book: http://www.AbominableFirebug.com/
_


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