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<div class="moz-cite-prefix">On 02/19/2015 12:11 PM, Jim Richard
wrote:<br>
</div>
<blockquote
cite="mid:09887AA8-5F57-495E-9AFC-2B34969DBB66@placeiq.com"
type="cite">
<meta http-equiv="Content-Type" content="text/html;
charset=windows-1252">
Hi Rich, here’s what all 4 of my IPA servers look like right now.
You can see that SSO-107’s CPU usage is much higher than the other
3 and it spikes to over 100% often. And what I see over time is
that the higher and higher cpu usage will happen between two of my
four servers, one will drop off and the other increases and each
time this cycle happens, the cpu usage on the one server that is
spiking will get a little bit higher.
<div class=""><br class="">
</div>
<div class="">The two servers that show this behavior are SSO-107
and SSO-109.</div>
</blockquote>
<br>
SSO-107 is almost entirely idle except for 1 thread doing
replication updates, and the poll thread. There are 255 descriptors
it is polling on.<br>
<br>
SSO-109 is entirely idle except for the poll thread. There are 230
descriptors it is polling on.<br>
<br>
You might try using top with the ns-slapd process and the 'H' -
Threads mode flag. It would be very interesting to see the cpu
usage breakdown by thread.<br>
<br>
If it is indeed the poll thread that is consuming all of the cpu,
there's not much that can be done. CPU usage in the poll thread is
a function of the number of connections, but since there is not much
difference between 230 and 255, I would not expect a large CPU usage
difference between 107 and 109 based solely on number of
connections.<br>
<br>
Are you seeing timeouts or application failures or poor performance
that seems to be due to high CPU usage? If so, and these are
virtual machines, you might consider adding more virtual CPUs to
give the server more processing power for the worker threads to
compensate for monopolization by the poll thread.<br>
<br>
<blockquote
cite="mid:09887AA8-5F57-495E-9AFC-2B34969DBB66@placeiq.com"
type="cite">
<div class=""><br class="">
</div>
<div class="">I’ve attached some more detailed stack trace as
well.</div>
<div class=""><br class="">
</div>
<br>
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<div class=""><br class="">
</div>
<div class=""><br class="">
</div>
<div class=""><br class="">
</div>
<div class="">Here’s what my replication agreements look like:</div>
<div class=""><br class="">
</div>
<div class="">
<div class="">[root@sso-107 (NY) ~]$ ipa-replica-manage list</div>
<div class=""><a moz-do-not-send="true"
href="http://sso-108.nym1.placeiq.net" class="">sso-108.nym1.placeiq.net</a>:
master</div>
<div class=""><a moz-do-not-send="true"
href="http://sso-110.nym1.placeiq.net" class="">sso-110.nym1.placeiq.net</a>:
master</div>
<div class=""><a moz-do-not-send="true"
href="http://sso-107.nym1.placeiq.net" class="">sso-107.nym1.placeiq.net</a>:
master</div>
<div class=""><a moz-do-not-send="true"
href="http://sso-109.nym1.placeiq.net" class="">sso-109.nym1.placeiq.net</a>:
master</div>
<div class=""><br class="">
</div>
<div class="">[root@sso-107 (NY) ~]$ ipa-replica-manage list <a
moz-do-not-send="true"
href="http://sso-107.nym1.placeiq.net" class="">sso-107.nym1.placeiq.net</a></div>
<div class=""><a moz-do-not-send="true"
href="http://sso-108.nym1.placeiq.net" class="">sso-108.nym1.placeiq.net</a>:
replica</div>
<div class=""><a moz-do-not-send="true"
href="http://sso-110.nym1.placeiq.net" class="">sso-110.nym1.placeiq.net</a>:
replica</div>
<div class=""><br class="">
</div>
<div class="">[root@sso-107 (NY) ~]$ ipa-replica-manage list <a
moz-do-not-send="true"
href="http://sso-108.nym1.placeiq.net" class="">sso-108.nym1.placeiq.net</a></div>
<div class=""><a moz-do-not-send="true"
href="http://sso-107.nym1.placeiq.net" class="">sso-107.nym1.placeiq.net</a>:
replica</div>
<div class=""><a moz-do-not-send="true"
href="http://sso-109.nym1.placeiq.net" class="">sso-109.nym1.placeiq.net</a>:
replica</div>
<div class=""><br class="">
</div>
<div class="">[root@sso-107 (NY) ~]$ ipa-replica-manage list <a
moz-do-not-send="true"
href="http://sso-109.nym1.placeiq.net" class="">sso-109.nym1.placeiq.net</a></div>
<div class=""><a moz-do-not-send="true"
href="http://sso-108.nym1.placeiq.net" class="">sso-108.nym1.placeiq.net</a>:
replica</div>
<div class=""><a moz-do-not-send="true"
href="http://sso-110.nym1.placeiq.net" class="">sso-110.nym1.placeiq.net</a>:
replica</div>
<div class=""><br class="">
</div>
<div class="">[root@sso-107 (NY) ~]$ ipa-replica-manage list <a
moz-do-not-send="true"
href="http://sso-110.nym1.placeiq.net" class="">sso-110.nym1.placeiq.net</a></div>
<div class=""><a moz-do-not-send="true"
href="http://sso-107.nym1.placeiq.net" class="">sso-107.nym1.placeiq.net</a>:
replica</div>
<div class=""><a moz-do-not-send="true"
href="http://sso-109.nym1.placeiq.net" class="">sso-109.nym1.placeiq.net</a>:
replica</div>
</div>
<div class=""><br class="">
</div>
<div class=""><br class="">
</div>
<div class=""><br class="">
<div class="">
<div class=""><br class="">
</div>
<div class=""><br class="">
</div>
<div class="">
<div class="">SSO-107</div>
<div class=""><br class="">
</div>
<div class="">top - 15:58:08 up 2 days, 10:00, 1 user,
load average: 0.00, 0.03, 0.06</div>
<div class="">Tasks: 1 total, 0 running, 1 sleeping,
0 stopped, 0 zombie</div>
<div class="">Cpu(s): 12.2%us, 1.1%sy, 0.0%ni, 86.7%id,
0.1%wa, 0.0%hi, 0.0%si, 0.0%st</div>
<div class="">Mem: 2952788k total, 2160216k used,
792572k free, 182584k buffers</div>
<div class="">Swap: 4094972k total, 0k used,
4094972k free, 678292k cached</div>
<div class=""><br class="">
</div>
<div class=""> PID USER PR NI VIRT RES SHR S %CPU
%MEM TIME+ COMMAND</div>
<div class="">11615 dirsrv 20 0 2063m 843m 19m S 25.5
29.3 403:53.56 ns-slapd</div>
<div class=""><br class="">
</div>
<div class="">[root@sso-107 (NY)
/var/log/dirsrv/slapd-PLACEIQ-NET]$ ls -al /proc/`cat
/var/run/dirsrv/slapd-PLACEIQ-NET.pid`/fd|grep socket|wc
-l</div>
<div class="">245</div>
<div class=""><br class="">
</div>
<div class=""><br class="">
</div>
<div class=""><br class="">
</div>
<div class=""><br class="">
</div>
<div class="">SSO-108</div>
<div class=""><br class="">
</div>
<div class="">top - 15:57:26 up 3 days, 17:25, 1 user,
load average: 0.03, 0.03, 0.00</div>
<div class="">Tasks: 1 total, 0 running, 1 sleeping,
0 stopped, 0 zombie</div>
<div class="">Cpu(s): 0.3%us, 0.2%sy, 0.0%ni, 99.4%id,
0.1%wa, 0.0%hi, 0.0%si, 0.0%st</div>
<div class="">Mem: 2952788k total, 2200792k used,
751996k free, 182084k buffers</div>
<div class="">Swap: 4094972k total, 0k used,
4094972k free, 713848k cached</div>
<div class=""><br class="">
</div>
<div class=""> PID USER PR NI VIRT RES SHR S %CPU
%MEM TIME+ COMMAND</div>
<div class="">24399 dirsrv 20 0 2055m 819m 19m S 0.8
28.4 54:48.53 ns-slapd</div>
<div class=""><br class="">
</div>
<div class="">[root@sso-108 (NY)
/var/log/dirsrv/slapd-PLACEIQ-NET]$ ls -al /proc/`cat
/var/run/dirsrv/slapd-PLACEIQ-NET.pid`/fd|grep socket|wc
-l</div>
<div class="">232</div>
<div class=""><br class="">
</div>
<div class=""><br class="">
</div>
<div class=""><br class="">
</div>
<div class=""><br class="">
</div>
<div class="">SSO-109</div>
<div class=""><br class="">
</div>
<div class="">top - 16:00:05 up 4 days, 9:10, 1 user,
load average: 0.06, 0.32, 0.35</div>
<div class="">Tasks: 1 total, 0 running, 1 sleeping,
0 stopped, 0 zombie</div>
<div class="">Cpu(s): 0.7%us, 0.3%sy, 0.0%ni, 98.9%id,
0.2%wa, 0.0%hi, 0.0%si, 0.0%st</div>
<div class="">Mem: 2952788k total, 2422572k used,
530216k free, 235472k buffers</div>
<div class="">Swap: 4094972k total, 0k used,
4094972k free, 906080k cached</div>
<div class=""><br class="">
</div>
<div class=""> PID USER PR NI VIRT RES SHR S %CPU
%MEM TIME+ COMMAND</div>
<div class="">22522 dirsrv 20 0 2065m 772m 19m S 1.2
26.8 308:13.07 ns-slapd</div>
<div class=""><br class="">
</div>
<div class="">[root@sso-109 (NY) ~]$ ls -al /proc/`cat
/var/run/dirsrv/slapd-PLACEIQ-NET.pid`/fd|grep socket|wc
-l</div>
<div class="">219</div>
<div class=""><br class="">
</div>
<div class=""><br class="">
</div>
<div class=""><br class="">
</div>
<div class=""><br class="">
</div>
<div class=""><br class="">
</div>
<div class="">SSO-110</div>
<div class=""><br class="">
</div>
<div class="">top - 16:07:54 up 14 days, 18:03, 1 user,
load average: 0.00, 0.01, 0.00</div>
<div class="">Tasks: 1 total, 0 running, 1 sleeping,
0 stopped, 0 zombie</div>
<div class="">Cpu(s): 2.0%us, 1.0%sy, 0.0%ni, 96.7%id,
0.3%wa, 0.0%hi, 0.0%si, 0.0%st</div>
<div class="">Mem: 2952788k total, 2304556k used,
648232k free, 155216k buffers</div>
<div class="">Swap: 4094972k total, 64k used,
4094908k free, 748972k cached</div>
<div class=""><br class="">
</div>
<div class=""> PID USER PR NI VIRT RES SHR S %CPU
%MEM TIME+ COMMAND</div>
<div class=""> 2401 dirsrv 20 0 2074m 839m 18m S 4.8
29.1 48:25.58 ns-slapd</div>
<div class=""> </div>
<div class="">[root@sso-110 (NY)
/var/log/dirsrv/slapd-PLACEIQ-NET]$ ls -al /proc/`cat
/var/run/dirsrv/slapd-PLACEIQ-NET.pid`/fd|grep socket|wc
-l</div>
<div class="">257</div>
</div>
<div class=""><br class="">
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text-indent: 0px; text-transform: none; white-space:
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0px; vertical-align: top; background-color:
rgb(99, 80, 178);" class="" width="5"><br>
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0px; vertical-align: top; background-color:
rgb(119, 117, 171);" class="" width="5"><br>
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rgb(119, 117, 171);" class="" width="5"><br>
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0px; vertical-align: top; background-color:
rgb(119, 117, 171);" class="" width="5"><br>
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0px; vertical-align: top; background-color:
rgb(119, 117, 171);" class="" width="5"><br>
</td>
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0px; vertical-align: top; background-color:
rgb(119, 117, 171);" class="" width="5"><br>
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0px; vertical-align: top; background-color:
rgb(119, 117, 171);" class="" width="5"><br>
</td>
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0px; vertical-align: top; background-color:
rgb(119, 117, 171);" class="" width="5"><br>
</td>
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0px; vertical-align: top; background-color:
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0px; vertical-align: top; background-color:
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</tbody><tbody class="">
<tr class="" height="10">
<td colspan="36" style="font-family: Georgia,
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padding-top: 5px; font-style: italic; font-size:
10px; letter-spacing: 0.1em; line-height: 1.5em;
color: rgb(117, 107, 172);" class=""><span
style="color: rgb(70, 70, 70);" class="">Jim
Richard | </span><a moz-do-not-send="true"
href="http://www.google.com/url?q=http%3A%2F%2Fwww.placeiq.com%2F&sa=D&sntz=1&usg=AFrqEzcYjZpDPyqW7feNK9EgLq-c9JlHiw"
target="_blank" style="color: rgb(117, 107,
172); text-decoration: none;" class="">PlaceIQ</a> |
Systems Administrator | jrichard<a
moz-do-not-send="true"
href="mailto:name@placeiq.com" target="_blank"
style="color: rgb(117, 107, 172);
text-decoration: none;" class="">@placeiq.com</a> | <a
moz-do-not-send="true" style="color: rgb(17,
85, 204);" class="">+1 (646) 338-8905</a></td>
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<div>
<blockquote type="cite" class="">
<div class="">On Feb 19, 2015, at 9:33 AM, Rich
Megginson <<a moz-do-not-send="true"
href="mailto:rmeggins@redhat.com" class="">rmeggins@redhat.com</a>>
wrote:</div>
<br class="Apple-interchange-newline">
<div class="">
<meta content="text/html; charset=windows-1252"
http-equiv="Content-Type" class="">
<div bgcolor="#FFFFFF" text="#000000" class="">
<div class="moz-cite-prefix">On 02/18/2015 11:05 PM,
Jatin Nansi wrote:<br class="">
</div>
<blockquote cite="mid:54E57D28.103@redhat.com"
type="cite" class="">
<meta content="text/html; charset=windows-1252"
http-equiv="Content-Type" class="">
Check the ns-slapd access and error logs of the DS
instance hosting the IPA instance. The strace
output indicates that ns-slapd spent most of its
time waiting for network activity to happen
(poll), which is normal for ns-slapd.<br class="">
</blockquote>
<br class="">
The number of open connections correlates to the CPU
usage. Do this:<br class="">
<br class="">
# ls -al /proc/`cat
/var/run/dirsrv/slapd-MY-DOMAIN.pid`/fd|grep
socket|wc -l<br class="">
<br class="">
How many socket connections do you have?<br class="">
<br class="">
Also, it will be very useful to get some stack
traces of the running server to see what the various
threads are doing. See <a moz-do-not-send="true"
class="moz-txt-link-freetext"
href="http://www.port389.org/docs/389ds/FAQ/faq.html#debugging-hangs">http://www.port389.org/docs/389ds/FAQ/faq.html#debugging-hangs</a><br
class="">
<br class="">
<blockquote cite="mid:54E57D28.103@redhat.com"
type="cite" class=""> <br class="">
Jatin<br class="">
<div class="moz-cite-prefix">On 19/02/15 15:52,
Jim Richard wrote:<br class="">
</div>
<blockquote
cite="mid:30BE1A3D-7170-485D-9A91-C868682450D9@placeiq.com"
type="cite" class="">
<meta http-equiv="Content-Type"
content="text/html; charset=windows-1252"
class="">
I’ve got 4 Redhat IDM masters in a multi-master
config. 3.0.0-42.el6.centos is the IPA version,
389-ds-base version 1.2.11.15-48.el6_6, Centos
6.6
<div class=""><br class="">
</div>
<div class="">Monitoring established connections
on port 389 and dsInOps over time shows a
consistent/even level of activity however 2 of
the 4 IPA servers show ever increasing CPI
usage by ns-slapd. One ns-slapd process will
start to show increased CPU for a time, then
drop off as another then increases. This cycle
continues with each switch seeing more and
more total SPU usage by ns-slapd.</div>
<div class=""><br class="">
</div>
<div class="">strace timing for the offending
ns-slapd looks like the following:</div>
<div class=""><br class="">
</div>
<div class=""><br class="">
</div>
</blockquote>
</blockquote>
</div>
</div>
</blockquote>
<br class="">
<blockquote type="cite" class="">
<div class="">
<div bgcolor="#FFFFFF" text="#000000" class="">
<blockquote cite="mid:54E57D28.103@redhat.com"
type="cite" class="">
<blockquote
cite="mid:30BE1A3D-7170-485D-9A91-C868682450D9@placeiq.com"
type="cite" class="">
<div class=""> </div>
<div class="">
<div class="">% time seconds usecs/call
calls errors syscall</div>
<div class="">------ ----------- -----------
--------- --------- ----------------</div>
<div class=""> 96.12 9.342272 1133
8243 poll</div>
<div class=""> 3.86 0.375457 53
7066 41 futex</div>
<div class=""> 0.01 0.000668 0
8244 8244 getpeername</div>
<div class=""> 0.00 0.000374 0
929 close</div>
<div class=""> 0.00 0.000368 0
3201 read</div>
<div class=""> 0.00 0.000151 0
882 setsockopt</div>
<div class=""> 0.00 0.000095 2
42 access</div>
<div class=""> 0.00 0.000033 0
1365 fcntl</div>
<div class=""> 0.00 0.000000 0
42 open</div>
<div class=""> 0.00 0.000000 0
39 stat</div>
<div class=""> 0.00 0.000000 0
42 fstat</div>
<div class=""> 0.00 0.000000 0
1 madvise</div>
<div class=""> 0.00 0.000000 0
441 accept</div>
<div class=""> 0.00 0.000000 0
441 getsockname</div>
<div class=""> 0.00 0.000000 0
1 restart_syscall</div>
<div class="">------ ----------- -----------
--------- --------- ----------------</div>
<div class="">100.00 9.719418
30979 8285 total</div>
</div>
<div class=""><br class="">
</div>
<div class=""><br class="">
</div>
<div class="">I have carefully reviewed
cn=config settings on all four master servers
to confirm that they match.</div>
<div class=""><br class="">
</div>
<div class="">Based on this strace output can
you perhaps point me in the right direction,
give me a clue on what I should be looking at.</div>
<div class=""><br class="">
</div>
<div class="">Here’s a screen shot of my Zabbix
reporting to help describe the problem. Note
the graph in the bottom right corner.</div>
<div class=""><br class="">
</div>
<div class="">The problem is most certainly
related to replication but I just don’t know
what specifically to look at.</div>
<div class=""><br class="">
</div>
<div class=""><span
id="cid:part1.04040701.00090201@redhat.com"><Mail
Attachment.png></span></div>
<div class=""><br class="">
</div>
<div class=""><br class="">
</div>
<div class=""><br class="">
</div>
<div class="">Thanks in advance for any clues
you can provide.<br class="">
<div class="">
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class="">
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class="">
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vertical-align: top;
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<td colspan="36" style="font-family:
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vertical-align: top; padding-top:
5px; font-style: italic;
font-size: 10px; letter-spacing:
0.1em; line-height: 1.5em; color:
rgb(117, 107, 172);" class=""><span
style="color: rgb(70, 70, 70);"
class="">Jim Richard | </span><a
moz-do-not-send="true"
href="http://www.google.com/url?q=http%3A%2F%2Fwww.placeiq.com%2F&sa=D&sntz=1&usg=AFrqEzcYjZpDPyqW7feNK9EgLq-c9JlHiw"
target="_blank" style="color:
rgb(117, 107, 172);
text-decoration: none;" class="">PlaceIQ</a> |
Systems Administrator |
jrichard<a moz-do-not-send="true"
href="mailto:name@placeiq.com"
target="_blank" style="color:
rgb(117, 107, 172);
text-decoration: none;" class="">@placeiq.com</a> | <a
moz-do-not-send="true"
style="color: rgb(17, 85, 204);"
class="">+1 (646) 338-8905</a></td>
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Go To <a class="moz-txt-link-freetext" href="http://freeipa.org">http://freeipa.org</a> for more info on the project</div>
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