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