Bug 612292

Summary: Performance loss querying object database from command line
Product: Red Hat Enterprise Linux 6 Reporter: Lon Hohberger <lhh>
Component: corosyncAssignee: Steven Dake <sdake>
Status: CLOSED CURRENTRELEASE QA Contact: Cluster QE <mspqa-list>
Severity: medium Docs Contact:
Priority: low    
Version: 6.0CC: cluster-maint, syeghiay
Target Milestone: rc   
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: corosync-1.2.3-12.el6 Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2010-11-15 13:53:53 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
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Description Flags
flatiron revision 2987 to fix problem none

Description Lon Hohberger 2010-07-07 19:23:46 UTC 
Description of problem:

In order to report errors with /dev/shm being full, writes zeroes to all of the pages.  This was done to resolve bug 607738.

This introduces a performance regression for utilities which query a couple of things from the object database (ex: rgmanager's cmdline utility 'clulog').

Version-Release number of selected component (if applicable): 1.2.3-9

How reproducible: 100%

Steps to Reproduce: 
1. time clulog -s7 hi
  
Actual results: 1+ second per run

Expected results: faster ;)

Additional info: clulog is not the only piece of software affected; it just happens to be the one I noticed.

A couple of cursory tests with Steve showed that increasing the buffer size to 4096 had a significant improvement, while values larger than that had little improvement.
Comment 2 Steven Dake 2010-07-07 21:55:06 UTC 
Created attachment 430185 [details]
flatiron revision 2987 to fix problem
Comment 3 Lon Hohberger 2010-07-07 22:53:23 UTC 
[root@crackle ~]# time clulog -s7 hi
hi

real    0m0.211s
user    0m0.007s
sys     0m0.070s

[root@crackle ~]# rpm -q corosync corosynclib corosynclib-devel
corosync-1.2.3-12.el6.x86_64
corosynclib-1.2.3-12.el6.x86_64
corosynclib-devel-1.2.3-12.el6.x86_64

Works for me.
Comment 5 releng-rhel@redhat.com 2010-11-15 13:53:53 UTC 
Red Hat Enterprise Linux 6.0 is now available and should resolve
the problem described in this bug report. This report is therefore being closed
with a resolution of CURRENTRELEASE. You may reopen this bug report if the
solution does not work for you.