NAME
max_thread_proc — defines the maximum number of concurrent threads allowed per process.
VALUES
Allowed values
Between 64 and nkthread
DESCRIPTION
max_thread_proc
is a dynamic tunable that limits the maximum number of threads
allowed per process on the system. When tuning
max_thread_proc,
the maximum number of threads allowed per process will be the new
value of
max_thread_proc.
No process will be able to create new threads such that the total count of
its threads exceeds
max_thread_proc.
Who is Expected to Change This Tunable?
System administrators that run applications on their systems requiring
a high number of threads per process.
Restrictions on Changing
The effect of tuning
max_thread_proc
on existing processes is undefined. However, existing threads will not be
effected.
When Should the Value of This Tunable Be Raised?
The value of
max_thread_proc
should be raised if there is a need to run an application that requires
a higher number of threads per process than what
max_thread_proc
is currently set to accommodate.
Also, if thread creation fails with the
errno
value of
EAGAIN,
then it could indicate that the
max_thread_proc
has been reached.
However, reaching
max_thread_proc
is not the only reason why a thread creation could fail with
EAGAIN.
EAGAIN
may be returned if the
nkthread
system tunable has been reached or memory on the system is exhausted.
What Are the Side Effects of Raising the Value?
A group of processes may be able to exhaust the system wide limit of
threads on the system.
When Should the Value of This Tunable Be Lowered?
If you feel that it is necessary to limit the number of threads
allowed per process.
What Are the Side Effects of Lowering the Value?
Some applications which need a high number of threads may behave
differently or fail to operate.
What Other Tunable Values Should Be Changed at the Same Time?
You may want to look at the value of
nkthread.
WARNINGS
All HP-UX kernel tunable parameters are release specific.
This parameter may be removed or have its meaning changed in
future releases of HP-UX.
Installation of optional kernel software, from HP or other vendors,
may cause changes to tunable parameter values. After installation,
some tunable parameters may no longer be at the default or
recommended values. For information about the effects of
installation on tunable values, consult the documentation
for the kernel software being installed.
For information about optional kernel software that was
factory installed on your system, see
HP-UX Release Notes
at
http://docs.hp.com.
AUTHOR
max_thread_proc
was developed by HP.
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