From 37f89d2b209dcf4e6dec8af652206918305b46af Mon Sep 17 00:00:00 2001 From: GONG Jie Date: Sun, 31 Dec 2017 23:59:59 +0000 Subject: [PATCH] Remove trailing spaces in file docs/source/advanced/performance_tuning/linux_os_tuning.rst --- docs/source/advanced/performance_tuning/linux_os_tuning.rst | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/docs/source/advanced/performance_tuning/linux_os_tuning.rst b/docs/source/advanced/performance_tuning/linux_os_tuning.rst index 331d140c0..c45a9a65c 100644 --- a/docs/source/advanced/performance_tuning/linux_os_tuning.rst +++ b/docs/source/advanced/performance_tuning/linux_os_tuning.rst @@ -4,8 +4,8 @@ System Tuning Settings for Linux Adjusting Operating System tunables can improve large scale cluster performance, avoid bottlenecks, and prevent failures. The following sections are a collection of suggestions that have been gathered from various large scale HPC clusters. You should investigate and evaluate the validity of each suggestion before applying them to your cluster. -#. Tuning Linux ulimits: - +#. Tuning Linux ulimits: + 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*. :: @@ -24,7 +24,7 @@ Adjusting Operating System tunables can improve large scale cluster performance, 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 net.ipv4.tcp_mem= 33554432 33554432 33554432