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add an example on the packimage performance optimized with pigz enabled

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immarvin 2015-09-14 09:01:09 -04:00
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docs/source/guides/admin-guides/manage_clusters/common/deployment/acc_initrd_rootimg_gen.rst
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@ -1,7 +1,7 @@
Accelerating the diskless initrd and rootimg generating
========================================================
Generating diskless initrd with ``genimage`` and compressed rootimg with ``packimage`` and ``liteimg`` is a time-comsuming process, it can be accelerated by enabling paralell compression tool ``pigz`` on the management node with multiple processors and cores.
Generating diskless initrd with ``genimage`` and compressed rootimg with ``packimage`` and ``liteimg`` is a time-comsuming process, it can be accelerated by enabling paralell compression tool ``pigz`` on the management node with multiple processors and cores. See :ref:`Appendix <pigz_example>` for an example on ``packimage`` performance optimized with ``pigz`` enabled.
The paralell compression tool ``pigz`` can be enabled by installing ``pigz`` package on the management server or diskless rootimg. Depending on the method of generating the initrd and compressed rootimg, the steps differ in different Linux distributions.
@ -56,5 +56,85 @@ Please refer to the http://fedoraproject.org/wiki/EPEL for more details on EPEL
``pigz`` should be installed on the management server. Please download ``pigz`` package from https://dl.fedoraproject.org/pub/epel/ , then install the ``pigz`` with ``yum`` or ``rpm``.
.. _pigz_example:
Appendix: An example on ``packimage`` performance optimization with "pigz" enabled
----------------------------------------------------------------------------------
This is an example on performance optimization with ``pigz`` enabled.
In this example, a xCAT command ``packimage rhels7-ppc64-netboot-compute`` is run on a Power 7 machine with 4 cores.
The system info: ::
# uname -a
Linux c910f03c01p03 3.10.0-123.el7.ppc64 #1 SMP Mon May 5 11:18:37 EDT 2014 ppc64 ppc64 ppc64 GNU/Linux
# cat /etc/os-release
NAME="Red Hat Enterprise Linux Server"
VERSION="7.0 (Maipo)"
ID="rhel"
ID_LIKE="fedora"
VERSION_ID="7.0"
PRETTY_NAME="Red Hat Enterprise Linux Server 7.0 (Maipo)"
ANSI_COLOR="0;31"
CPE_NAME="cpe:/o:redhat:enterprise_linux:7.0:GA:server"
HOME_URL="https://www.redhat.com/"
BUG_REPORT_URL="https://bugzilla.redhat.com/"
REDHAT_BUGZILLA_PRODUCT="Red Hat Enterprise Linux 7"
REDHAT_BUGZILLA_PRODUCT_VERSION=7.0
REDHAT_SUPPORT_PRODUCT="Red Hat Enterprise Linux"
REDHAT_SUPPORT_PRODUCT_VERSION=7.0
The CPU info: ::
# cat /proc/cpuinfo
processor : 0
cpu : POWER7 (architected), altivec supported
clock : 3550.000000MHz
revision : 2.0 (pvr 003f 0200)
processor : 1
cpu : POWER7 (architected), altivec supported
clock : 3550.000000MHz
revision : 2.0 (pvr 003f 0200)
processor : 2
cpu : POWER7 (architected), altivec supported
clock : 3550.000000MHz
revision : 2.0 (pvr 003f 0200)
processor : 3
cpu : POWER7 (architected), altivec supported
clock : 3550.000000MHz
revision : 2.0 (pvr 003f 0200)
timebase : 512000000
platform : pSeries
model : IBM,8233-E8B
machine : CHRP IBM,8233-E8B
The time spent on ``packimage`` with ``gzip``: ::
# time packimage rhels7-ppc64-netboot-compute
Packing contents of /install/netboot/rhels7/ppc64/compute/rootimg
compress method:gzip
real 1m14.896s
user 0m0.159s
sys 0m0.019s
The time spent on ``packimage`` with ``pigz``: ::
# time packimage rhels7-ppc64-netboot-compute
Packing contents of /install/netboot/rhels7/ppc64/compute/rootimg
compress method:pigz
real 0m23.177s
user 0m0.176s
sys 0m0.016s