NAME
maxuprc — limits the maximum number of concurrent user processes per user
VALUES
Allowed values
Between 3 and (nproc -5).
DESCRIPTION
maxuprc
is a dynamic tunable that limits the maximum number of processes per user.
Only root can have more than the number of processes limited by
maxuprc.
Who is Expected to Change This Tunable?
System administrators can change the value of
maxuprc
depending on the usage of the system.
Restrictions on Changing
None. This tunable is dynamic.
When Should the Value of This Tunable Be Raised?
The value of
maxuprc
should be changed if users require more processes than what they are
currently allowed by
maxuprc.
If
fork()
fails with an error value of
EAGAIN,
it could be an indication that
maxuprc
was reached by that particular user.
However, that is not the only reason that could cause
fork()
to fail with an errno value of
EAGAIN.
EAGAIN
may be returned if
nproc
system tunable has been reached or memory on the system has been exhausted.
What Are the Side Effects of Raising the Value?
Raising the value of
maxuprc
allows a single user to consume a greater percentage of the system resources.
When Should the Value of This Tunable Be Lowered?
The value of
maxuprc
should be lowered when individual users are monopolizing system
resources by running too many concurrent processes.
What Are the Side Effects of Lowering the Value?
Applications that depend on a large number of processes may behave
differently or fail. Existing processes will continue to run but new
process creations which would result in the user exceeding
maxuprc
will fail.
What Other Tunable Values Should Be Changed at the Same Time?
When tuning
maxuprc
you should keep in mind the value of
nproc.
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
maxuprc
was developed by HP.
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