From ee686a4d426ac563b2d51a7a33fe59b92bae4ae6 Mon Sep 17 00:00:00 2001 From: immarvin <yangsbj@cn.ibm.com> Date: Mon, 14 Sep 2015 09:01:09 -0400 Subject: [PATCH] add an example on the packimage performance optimized with pigz enabled --- .../deployment/acc_initrd_rootimg_gen.rst | 82 ++++++++++++++++++- 1 file changed, 81 insertions(+), 1 deletion(-) diff --git a/docs/source/guides/admin-guides/manage_clusters/common/deployment/acc_initrd_rootimg_gen.rst b/docs/source/guides/admin-guides/manage_clusters/common/deployment/acc_initrd_rootimg_gen.rst index 3bfae7859..744d76705 100644 --- a/docs/source/guides/admin-guides/manage_clusters/common/deployment/acc_initrd_rootimg_gen.rst +++ b/docs/source/guides/admin-guides/manage_clusters/common/deployment/acc_initrd_rootimg_gen.rst @@ -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 +