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提交 d052d07b 编写于 作者: D David Yozie
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Docs - updating RG performance note

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gpdb-doc/dita/admin_guide/wlmgmt.xml
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......@@ -11,14 +11,15 @@
amount of memory used to execute a query, and the relative amount of CPU devoted to processing
a query. Greenplum Database provides two schemes to manage resources - Resource Queues and
Resource Groups.</p>
<note type="warning">Significant Greenplum Database performance degradation has been observed
<note type="important">Significant Greenplum Database performance degradation has been observed
when enabling resource group-based workload management on RedHat 6.x, CentOS 6.x, and SuSE 11
systems. This issue is caused by a Linux cgroup kernel bug. This kernel bug has been fixed in
CentOS 7.x and Red Hat 7.x systems. The performance problem is mitigated in Red Hat 6 systems
that use kernel version 2.6.32-696 or higher. <p>SuSE 11 does not have a kernel version that
resolves this issue; resource groups are considered to be an experimental feature on this platform. <ph
otherprops="pivotal">Resource groups are not supported on SuSE 11 for production
use.</ph></p></note>
CentOS 7.x and Red Hat 7.x systems. <p>If you use RedHat 6 and the performance with resource
groups is acceptable for your use case, upgrade your kernel to version 2.6.32-696 or higher
to benefit from other fixes to the cgroups implementation. </p><p>SuSE 11 does not have a
kernel version that resolves this issue; resource groups are still considered to be an
experimental feature on this platform. <ph otherprops="pivotal">Resource groups are not
supported on SuSE 11 for production use.</ph></p></note>
<p>Either the resource queue or the resource group management scheme can be active in Greenplum
Database; both schemes cannot be active at the same time.</p>
<p>Resource queues are enabled by default when you install your Greenplum Database cluster.
......
gpdb-doc/dita/admin_guide/workload_mgmt_resgroups.xml
浏览文件 @ d052d07b
......@@ -197,14 +197,16 @@
<topic id="topic71717999" xml:lang="en">
<title>Using Resource Groups</title>
<body>
<note type="warning">Significant Greenplum Database performance degradation has been observed
when enabling resource group-based workload management on RedHat 6.x, CentOS 6.x, and SuSE
11 systems. This issue is caused by a Linux cgroup kernel bug. This kernel bug has been
fixed in CentOS 7.x and Red Hat 7.x systems. The performance problem is mitigated in Red Hat
6 systems that use kernel version 2.6.32-696 or higher. <p>SuSE 11 does not have a kernel
version that resolves this issue; resource groups are considered to be an experimental
feature on this platform. <ph otherprops="pivotal">Resource groups are not supported on
SuSE 11 for production use.</ph></p></note>
<note type="important">Significant Greenplum Database performance degradation has been
observed when enabling resource group-based workload management on RedHat 6.x, CentOS 6.x,
and SuSE 11 systems. This issue is caused by a Linux cgroup kernel bug. This kernel bug has
been fixed in CentOS 7.x and Red Hat 7.x systems. <p>If you use RedHat 6 and the performance
with resource groups is acceptable for your use case, upgrade your kernel to version
2.6.32-696 or higher to benefit from other fixes to the cgroups implementation.
</p><p>SuSE 11 does not have a kernel version that resolves this issue; resource groups
are still considered to be an experimental feature on this platform. <ph
otherprops="pivotal">Resource groups are not supported on SuSE 11 for production
use.</ph></p></note>
<section id="topic833" xml:lang="en">
<title>Prerequisite</title>
<p>Greenplum Database resource groups use Linux Control Groups (cgroups) to manage CPU
......
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