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| -rw-r--r-- | doc/server/configuration.txt | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/doc/server/configuration.txt b/doc/server/configuration.txt index bb4983367..383367a46 100644 --- a/doc/server/configuration.txt +++ b/doc/server/configuration.txt @@ -218,3 +218,46 @@ To select which backend to use, set the ``backend`` option in the * ``best`` (the default; currently the same as ``builtin``) ``best`` may change in future releases. + +Multiprocessing core configuration +---------------------------------- + +If you use the multiprocessing core, there are other bits you may wish +to twiddle. + +By default, the server spawns as many children as the host has CPUs. +(This is determined by ``multiprocessing.cpu_count()``.) To change +this, set: + +.. code-block:: conf + + [server] + children = 4 + +The optimal number of children may vary depending on your workload. +For instance, if you are using :ref:`native yum +library support <native-yum-libraries>`, then a separate process is +spawned for each client to resolve its package dependencies, so +keeping the children at or below the CPU count is likely a good idea. +If you're not using native yum library support, though, you may wish +to oversubscribe the core slightly. It's recommended that you test +various configurations and use what works best for your workload. + +Secondly, if ``tmpwatch`` is enabled, you must either disable it or +exclude the pattern ``/tmp/pymp-\*``. For instance, on RHEL or CentOS +you may have a line like the following in +``/etc/cron.daily/tmpwatch``: + +.. code-block:: bash + + /usr/sbin/tmpwatch -x /tmp/.X11-unix -x /tmp/.XIM-unix -x /tmp/.font-unix \ + -x /tmp/.ICE-unix -x /tmp/.Test-unix 240 /tmp + +You would need to add ``-X /tmp/pymp-\*`` to it, like so: + +.. code-block:: bash + + /usr/sbin/tmpwatch -x /tmp/.X11-unix -x /tmp/.XIM-unix -x /tmp/.font-unix \ + -x /tmp/.ICE-unix -x /tmp/.Test-unix -X /tmp/pymp-\* 240 /tmp + +See https://bugzilla.redhat.com/show_bug.cgi?id=1058310 for more information. |