[Freeipa-users] ns-slapd high cpu usage
Ludwig Krispenz
lkrispen at redhat.com
Mon Jul 13 15:29:13 UTC 2015
On 07/13/2015 05:05 PM, Andrew E. Bruno wrote:
> On Mon, Jul 13, 2015 at 04:58:46PM +0200, Ludwig Krispenz wrote:
>> can you get a pstack of the slapd process along with a top -H to find th
>> ethread with high cpu usage
> Attached is the full stacktrace of the running ns-slapd proccess. top -H
> shows this thread (2879) with high cpu usage:
>
> 2879 dirsrv 20 0 3819252 1.962g 11680 R 99.9 3.1 8822:10 ns-slapd
this thread is a replication thread sending updates, what is strange is
that the current csn_str is quite old (july, 7th), I can't tell which
agreeement this thread is handling, but looks like it is heavily reading
the changeglog and sending updates. anything changed recently in
replication setup ?
>
>
>
>
>
>> On 07/13/2015 04:46 PM, Andrew E. Bruno wrote:
>>> We have 3 freeipa-replicas. Centos 7.1.1503, ipa-server 4.1.0-18, and
>>> 389-ds 1.3.3.1-16.
>>>
>>> Recently, the ns-slapd process on one of our replicas started showing higher
>>> than normal CPU usage. ns-slapd is pegged at high CPU usage more or less
>>> constantly.
>>>
>>> Seems very similar to this thread:
>>> https://www.redhat.com/archives/freeipa-users/2015-February/msg00281.html
>>>
>>> There are a few errors showing in /var/log/dirsrv/slapd-[domain]/errors (not
>>> sure if these are related):
>>>
>>>
>>> [13/Jul/2015:02:56:49 -0400] retrocl-plugin - retrocl_postob: operation failure [1]
>>> [13/Jul/2015:04:11:50 -0400] - dn2entry_ext: Failed to get id for changenumber=2277387,cn=changelog from entryrdn index (-30993)
>>> [13/Jul/2015:04:11:50 -0400] - Operation error fetching changenumber=2277387,cn=changelog (null), error -30993.
>>> [13/Jul/2015:04:11:50 -0400] DSRetroclPlugin - replog: an error occured while adding change number 2277387, dn = changenumber=2277387,cn=changelog: Operations error.
>>> [13/Jul/2015:04:11:50 -0400] retrocl-plugin - retrocl_postob: operation failure [1]
>>> [13/Jul/2015:07:41:49 -0400] - Operation error fetching Null DN (01de36ac-295411e5-b94db2ab-07afbca6), error -30993.
>>> [13/Jul/2015:07:41:49 -0400] - dn2entry_ext: Failed to get id for changenumber=2281464,cn=changelog from entryrdn index (-30993)
>>> [13/Jul/2015:07:41:49 -0400] - Operation error fetching changenumber=2281464,cn=changelog (null), error -30993.
>>> [13/Jul/2015:07:41:49 -0400] DSRetroclPlugin - replog: an error occured while adding change number 2281464, dn = changenumber=2281464,cn=changelog: Operations error.
>>> [13/Jul/2015:07:41:49 -0400] retrocl-plugin - retrocl_postob: operation failure [1]
>>>
>>>
>>> access logs seem to be showing normal activity. Here's the number of open
>>> connections:
>>>
>>> # ls -al /proc/`cat /var/run/dirsrv/slapd-[domain].pid`/fd|grep socket|wc -l
>>> 62
>>>
>>> Note: the other two replicas have much higher open connections (>250) and low
>>> cpu load avgs.
>>>
>>> Here's some output of logconv.pl from our most recent access log on the replica
>>> with high cpu load:
>>>
>>> Start of Logs: 13/Jul/2015:04:49:18
>>> End of Logs: 13/Jul/2015:10:06:11
>>>
>>> Processed Log Time: 5 Hours, 16 Minutes, 53 Seconds
>>>
>>> Restarts: 0
>>> Total Connections: 2343
>>> - LDAP Connections: 2120
>>> - LDAPI Connections: 223
>>> - LDAPS Connections: 0
>>> - StartTLS Extended Ops: 45
>>> Secure Protocol Versions:
>>> - TLS1.2 128-bit AES - 45
>>>
>>> Peak Concurrent Connections: 22
>>> Total Operations: 111865
>>> Total Results: 111034
>>> Overall Performance: 99.3%
>>>
>>> Searches: 95585 (5.03/sec) (301.64/min)
>>> Modifications: 3369 (0.18/sec) (10.63/min)
>>> Adds: 0 (0.00/sec) (0.00/min)
>>> Deletes: 0 (0.00/sec) (0.00/min)
>>> Mod RDNs: 0 (0.00/sec) (0.00/min)
>>> Compares: 0 (0.00/sec) (0.00/min)
>>> Binds: 7082 (0.37/sec) (22.35/min)
>>>
>>> Proxied Auth Operations: 0
>>> Persistent Searches: 0
>>> Internal Operations: 0
>>> Entry Operations: 0
>>> Extended Operations: 5317
>>> Abandoned Requests: 416
>>> Smart Referrals Received: 0
>>>
>>> VLV Operations: 96
>>> VLV Unindexed Searches: 0
>>> VLV Unindexed Components: 32
>>> SORT Operations: 64
>>>
>>> Entire Search Base Queries: 0
>>> Paged Searches: 3882
>>> Unindexed Searches: 0
>>> Unindexed Components: 5
>>>
>>> FDs Taken: 2566
>>> FDs Returned: 2643
>>> Highest FD Taken: 249
>>>
>>> Broken Pipes: 0
>>> Connections Reset By Peer: 0
>>> Resource Unavailable: 0
>>> Max BER Size Exceeded: 0
>>>
>>> Binds: 7082
>>> Unbinds: 2443
>>> - LDAP v2 Binds: 0
>>> - LDAP v3 Binds: 6859
>>> - AUTOBINDs: 223
>>> - SSL Client Binds: 0
>>> - Failed SSL Client Binds: 0
>>> - SASL Binds: 6814
>>> GSSAPI - 6591
>>> EXTERNAL - 223
>>> - Directory Manager Binds: 0
>>> - Anonymous Binds: 6591
>>> - Other Binds: 491
>>>
>>>
>>>
>>>
>>> strace timing on the ns-slapd process:
>>>
>>>
>>> % time seconds usecs/call calls errors syscall
>>> ------ ----------- ----------- --------- --------- ----------------
>>> 94.40 0.346659 5977 58 poll
>>> 4.10 0.015057 15057 1 restart_syscall
>>> 0.91 0.003353 57 59 59 getpeername
>>> 0.49 0.001796 150 12 futex
>>> 0.10 0.000364 73 5 read
>>> ------ ----------- ----------- --------- --------- ----------------
>>> 100.00 0.367229 135 59 total
>>>
>>>
>>> top output (with threads 'H'):
>>>
>>> PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
>>> 2879 dirsrv 20 0 3819252 1.962g 11680 R 99.9 3.1 8822:10 ns-slapd
>>> 2895 dirsrv 20 0 3819252 1.962g 11680 R 34.1 3.1 115:10.62 ns-slapd
>>> 2889 dirsrv 20 0 3819252 1.962g 11680 R 2.4 3.1 115:34.42 ns-slapd
>>> 2917 dirsrv 20 0 3819252 1.962g 11680 S 2.4 3.1 115:26.87 ns-slapd
>>> 2898 dirsrv 20 0 3819252 1.962g 11680 S 2.1 3.1 116:33.12 ns-slapd
>>> 2904 dirsrv 20 0 3819252 1.962g 11680 S 2.1 3.1 115:08.56 ns-slapd
>>> 2892 dirsrv 20 0 3819252 1.962g 11680 S 1.8 3.1 115:33.04 ns-slapd
>>> 2897 dirsrv 20 0 3819252 1.962g 11680 R 1.8 3.1 114:54.28 ns-slapd
>>> 2914 dirsrv 20 0 3819252 1.962g 11680 R 1.8 3.1 116:03.35 ns-slapd
>>> 2907 dirsrv 20 0 3819252 1.962g 11680 S 1.5 3.1 115:42.25 ns-slapd
>>> 2910 dirsrv 20 0 3819252 1.962g 11680 R 1.5 3.1 116:01.99 ns-slapd
>>> 2870 dirsrv 20 0 3819252 1.962g 11680 R 1.2 3.1 611:30.22 ns-slapd
>>> 2890 dirsrv 20 0 3819252 1.962g 11680 S 1.2 3.1 115:18.25 ns-slapd
>>> 2891 dirsrv 20 0 3819252 1.962g 11680 S 1.2 3.1 115:22.24 ns-slapd
>>> 2899 dirsrv 20 0 3819252 1.962g 11680 R 1.2 3.1 116:11.85 ns-slapd
>>> 2888 dirsrv 20 0 3819252 1.962g 11680 S 0.9 3.1 114:51.19 ns-slapd
>>> 2896 dirsrv 20 0 3819252 1.962g 11680 R 0.9 3.1 115:46.84 ns-slapd
>>> 2915 dirsrv 20 0 3819252 1.962g 11680 S 0.9 3.1 115:49.34 ns-slapd
>>> 2887 dirsrv 20 0 3819252 1.962g 11680 R 0.6 3.1 115:49.85 ns-slapd
>>> 2894 dirsrv 20 0 3819252 1.962g 11680 S 0.6 3.1 115:58.02 ns-slapd
>>> 2911 dirsrv 20 0 3819252 1.962g 11680 S 0.6 3.1 116:22.84 ns-slapd
>>> 2913 dirsrv 20 0 3819252 1.962g 11680 S 0.6 3.1 114:43.56 ns-slapd
>>>
>>>
>>> ns-slapd stays pegged >99%. Trying to figure out what ns-slapd is doing? Any
>>> pointers on where else to look?
>>>
>>> Thanks in advance.
>>>
>>> --Andrew
>>>
>> --
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>>
>>
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