is this an HP parameter?

[Rusty Sapper]

We are having a problem with a third party app and they wanted to know what this parameter was set at for our system.

PTHREAD_THREADS_MAX

I know it isn't a kernel parameter and they have already inquired about nkthreads and max_thread_proc.

thanks,

Rusty

[Jeff Schussele]

Rusty,

This earlier thread might help:

http://forums.itrc.hp.com/cm/QuestionAnswer/1,,0xf05b0b0717d1d5118ff40090279cd0f9,00.html

This is basically a thread limit variable.

HTH,
Jeff

[S.K. Chan]

The max_thread_proc parameter is related to PTHREAD_THREADS_MAX. Whatever value you got assigned to max_thread_proc becomes the limit value assigned to the limit variables PHTREAD_THREADS_MAX. Check /usr/include/limits.h. This is where PHTREAD_THREADS_MAX is defined.

[Helen French]

Hi Rusty,

Check this out and see the description about the parameter:

http://us-support.external.hp.com/cki/bin/doc.pl/sid=94bc17db0158731a44/screen=ckiDisplayDocument?docId=200000059774355

HTH,
Shiju

[Helen French]

Hi Rusty,

The defenition:

PTHREAD_THREADS_MAX - Maximum number of pthreads that can be created per process.

Check this document for related information, about all type of system configurable parameters:


http://www.docs.hp.com/cgi-bin/fsearch/framedisplay?top=/hpux/onlinedocs/B2355-90682/B2355-90682_top.html&con=/hpux/onlinedocs/B2355-90682/00/02/212-con.html&toc=/hpux/onlinedocs/B2355-90682/00/02/212-toc.html&searchterms=PTHREAD_THREADS_MAX&queryid=20020408-081439

HTH,
Shiju

[Rusty Sapper]

I looked in limits.h but did not find PTHREAD_THREADS_MAX
the only thing close was _POSIX_THREAD_KEYS_MAX

are they related? or the same?

also I rean getconf THREAD_THREAD_MAX which came back as 64. what is THREAD_THREAD_MAX ?

thanks,

Rusty

[Jeff Schussele]

Same a max_thread_proc.

The minimum & DEFAULT is 64 - so you need to ask them what value (up to 3000) do they think they'll need & set that (maybe plus 5-10% for wiggle room) & see if that solves the problem.

Rgds,
Jeff

[Helen French]

Hi Rusty,

Do a 'man sysconf' and it will give you the defenitions. THREAD_THREADS_MAX and PTHREAD_THREADS_MAX are the same. The other parameter might be related to POSIX shell and the defenition says - The number of pthread data keys per process.

HTH,
Shiju

[Rusty Sapper]

They already know that max_thread_proc is set to 1024. I have written a script that keeps track of threads and the most threads any one process is using is around 124. I they know what max_thread_proc is set at, why would they want to know about PTHREAD_THREADS_MAX?


TIA

Rusty

[MANOJ SRIVASTAVA]

Hi Rusty

Yes this is a HP kernel Parameter the value of PTHREAD_THREADS_MAX in limits.h defines the
maximum number of threads per process and must have
as a minimum value _POSIX_THREAD_THREADS_MAX. The definition
of PTHREAD_THREADS_MAX may be omitted from limits.h
on implementations where the corresponding value is
equal to or greater than the stated minimum, but is
indeterminate.


Manoj Srivastava

[Jeff Schussele]

Not sure because PTHREAD_THREADS_MAX gets set to whatever the value of max_thread_proc is.....unless they think their app can redefine it......OR.......if another process has runaway essentially eating all system resources. Also note that a DOS (or DDOS) attack can make use of a high max_thread_proc & really hammer you.

Jeff