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<div class="moz-cite-prefix">On 06/18/2013 01:51 AM, thierry bordaz
wrote:<br>
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<div class="moz-cite-prefix">On 06/18/2013 12:35 AM, Mahadevan,
Venkat wrote:<br>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><br>
I do not know why your environment is prone to trigger
db_deadlock (lot of replica agreements, VM, slow disks...).<br>
I think the best way to progress is that you fill a
ticket/bug so that we may track the issue. Note this bug is
possibly affecting all operations (ADD/MOD/MODRDN/DEL)<o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D">-------<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Times New
Roman","serif";color:#1F497D;mso-fareast-language:EN-CA"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Times New
Roman","serif";color:#1F497D;mso-fareast-language:EN-CA">Hi
Thierry,<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Times New
Roman","serif";color:#1F497D;mso-fareast-language:EN-CA"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Times New
Roman","serif";color:#1F497D;mso-fareast-language:EN-CA">We
are running in a VMWare environment, is this known to
cause issues and are there any tuning steps you can
recommend or things<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Times New
Roman","serif";color:#1F497D;mso-fareast-language:EN-CA">to
watch out for? Thanks and sorry for so many questions.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Times New
Roman","serif";color:#1F497D;mso-fareast-language:EN-CA"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Times New
Roman","serif";color:#1F497D;mso-fareast-language:EN-CA">cheers,<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Times New
Roman","serif";color:#1F497D;mso-fareast-language:EN-CA"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Times New
Roman","serif";color:#1F497D;mso-fareast-language:EN-CA">VM<o:p></o:p></span></p>
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<font face="Times New Roman, Times, serif">Hi Mahadevan,<br>
<br>
</font>
<blockquote><font face="Times New Roman, Times, serif">Running in
a VM should not be an issue if it follows the usual tuning
recommendation. But of course it adds a layer when
investigating a RC.<br>
What is weird is to hit so frequent (50) deadlock in a single
DB call. In addition it looks like it always happen when
updating the CL so I can think to only RA threads, CL trimming
and Write thread (the one holding the backend lock) being in
competition.</font></blockquote>
</blockquote>
<font face="Times New Roman, Times, serif">Search threads also.
Searches acquire a read lock on the pages used by the entry and
the indexes.</font><br>
<blockquote cite="mid:51C01174.7000309@redhat.com" type="cite">
<blockquote><font face="Times New Roman, Times, serif">You may try
to disable the RA for a test to check if they are responsible
of that. You may also remove the CL maxage to prevent the CL
trimming thread to be in the loop. Also you may check if you
have pb with disk IO. Or tune the dbcache to be in memory.<br>
Sorry I have no easy answer to your question because it
requires deeper investigations.<br>
<br>
</font></blockquote>
<font face="Times New Roman, Times, serif">best regards<br>
thierry<br>
</font> <br>
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