Hi, Imran;
On an operating system the maximum number of processs is
limited by two things:
(1) The number of descriptors available for processors. A long
time ago, linux used 256 descriptors allowing at max 256
process (I´m not sure if it is always the case). These
descriptors are consummed by OS process (ex. daemons) so
we have less than that.
(2) The total virtual memory available. In a broader way, RAM
size + swap space. The sum of process memory comsumation
can´t exceed this limit. Again, we shoul consider the area
ocuppied by OS and by all others process (for exemple,
X server, windows manager etc)
So... when you have problems on running process on a
single node you should verify these two conditions. On the
modern OS I imagine that (2) should be the main raison for failling
on process creation.
ASC
imran shaik wrote:
>
>
> Note: forwarded message attached.
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> Subject:
> Maximum number of processes
> From:
> imran shaik <sk.imran_at_[hidden]>
> Date:
> Tue, 4 Apr 2006 06:56:01 -0700 (PDT)
> To:
> mpich-discuss_at_[hidden]
>
> To:
> mpich-discuss_at_[hidden]
>
>
> Hi,
> I want to run around 200 MPI processes. I have two p4,256MB nodes
> connected via cross cable. I have installed redhat9 on it. Now i am able
> to run 90 simple "hello world" processes. If i exceed it says, no of
> clients for lamboot exceeded. It says 72 is the limit. But i get 90,
> dont know how.Anyways i need to execute more processes (around 200 ) on
> these nodes i have. Can any one suggest any way to do that?
>
> Also can anyone say whats the problem i am getting. Is it any unusual
> thing ?
>
> Thanks in advance.
>
> Regards,
> Imran
>
>
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> <http://us.rd.yahoo.com/mail_us/taglines/postman1/*http://us.rd.yahoo.com/evt=39663/*http://voice.yahoo.com>
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>
>
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