max number of processes in red hat

[R.O.]

Hi,

I think the equivalency of the HPUX parameter nproc in red-hat is .kernel/threads-max. Can anyone tell me if is this correct or not??

Regards,

R.O.

[Huc_1]

If I got this right under linux a thread is not a process

A thread in linux executes kernel function, a process execute kernel function using systems
calls.

a thread only run in kernel mode

process run in user or kernel mode

cat /proc/sys/kernel/threads-max

will tell you the current/running number of threads

have look in at

/usr/src/linux-2.4.20-20.9/include/linux/threads.h

so I do not think it is strictly the same

Often databases ask that this be increased

Hope this helps

J-P

[R.O.]

Hi,

So what is the kernel parameter that establish the max number of processes in linux?

Regards,

R.O.

[Huc_1]

There are Process rlimit_*
like RLIMIT_NPROC "limit process that user can owne"

There are many other RLIMIT_*, like memory lock, etc ..

But there is no process max limit at the kernel level that I am awared of !

well the amount of memory is the limit, but kernel param ! not that I know !

I am no expert, just trying to fit all the pieces myself, but dus far I have not found the exact match to nproc in Linux kernel.

J-P

[Caesar_3 · Accepted solution]

Hello!

Because of that linux kernel is much
generic than HPUX there is no need to
set "nproc", the kernel will create
procs til it will finish all the resources.

Caesar

[Vitaly Karasik_1]

few parameters may be relevant for you:

- kernel.threads-max (man sysctl for more)

- nproc - max number of processes per user (/etc/security/linits.comf)

regards,
Vitaly

[Huc_1]

There is a new other question in the linux forum that is about the nearly the same subject and in there is a link to

http://linuxperf.nl.linux.org/general/kerneltuning.html

found this to be very good ! thanks to Shelstraete Bart for this

The pointer nearly same subject new forum message is

http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=239333

J-P