[Freeipa-users] ns-slapd high cpu usage
Ludwig Krispenz
lkrispen at redhat.com
Mon Jul 13 14:58:46 UTC 2015
can you get a pstack of the slapd process along with a top -H to find th
ethread with high cpu usage
Ludwig
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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