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Fix 5178, update document for performance tunning (#5199)

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Bin Xu
2018-05-11 18:18:42 +08:00
committed by yangsong
parent a545ff791a
commit c1f7362ecf
1 changed files with 4 additions and 3 deletions
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7
docs/source/advanced/performance_tuning/linux_os_tuning.rst
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@@ -9,13 +9,13 @@ Adjusting Operating System tunables can improve large scale cluster performance,
The open file limits are important to high concurrence network services, such as ``xcatd``. For a large cluster, it is required to increase the number of open file limit to avoid **Too many open files** error. The default value is *1024* in most OS distributions, to add below configuration in ``/etc/security/limits.conf`` to increase to *14096*.
::
* soft nofiles 14096
* hard nofiles 14096
* soft nofile 14096
* hard nofile 14096
#. Tuning Network kernel parameters:
There might be hundreds of hosts in a big network for large cluster, tuning the network kernel parameters for optimum throughput and latency could improve the performance of distributed application. For example, adding below configuration in ``/etc/sysctl.conf`` to increase the buffer.
There might be hundreds of hosts in a big network for large cluster, tuning the network kernel parameters for optimum throughput and latency could improve the performance of distributed application. For example, adding below configuration in ``/etc/sysctl.conf`` to increase the buffer size and queue length of **xCAT SSL listener** service access point ( port **3001** ).
::
@@ -23,6 +23,7 @@ Adjusting Operating System tunables can improve large scale cluster performance,
net.core.wmem_max = 33554432
net.core.rmem_default = 65536
net.core.wmem_default = 65536
net.core.somaxconn = 8192
net.ipv4.tcp_rmem = 4096 33554432 33554432
net.ipv4.tcp_wmem = 4096 33554432 33554432