[Freeipa-users] 389-ds memory usage

[Rich Megginson]

On 04/22/2012 01:50 PM, Sigbjorn Lie wrote:
> Hi,
>
> I have different ipa domains, installed on Red Hat 6.2 or CentOS 6.2 
> servers, with all 389-ds updates applied. After some time all the 
> memory in the server is consumed, mostly by the ns-slapd process.
>
> I've looked at the RH Directory Server tuning manual at 
> docs.redhat.com and looked through the various tuning options. I found 
> the "nsslapd-cachememsize" and "nsslapd-dbcachesize" options to be set 
> to around 10MB by default. The id2entry.db4 file for the database in 
> the test IPA domain comes in at 6.7MB.
>
> If I restart the directory server the memory is released. And then 
> slowly consumed again over time.
>
> Running benchmarks with ldclt reveals much better numbers for the 
> directory servers that's recently been rebootet and does not yet 
> consume all the memory in the machine.
>
> Am I missing some configuration?

Try increasing your nsslapd-cachememsize and monitoring it closely.  
Using the size of id2entry.db4 is a good place to start, but that will 
not be enough.

http://docs.redhat.com/docs/en-US/Red_Hat_Directory_Server/9.0/html/Administration_Guide/Monitoring_Server_and_Database_Activity-Monitoring_Database_Activity.html

See also https://fedorahosted.org/389/ticket/51 and 
https://bugzilla.redhat.com/show_bug.cgi?id=697701

> Is this normal behaviour for 389-ds to consume all physical memory AND 
> all swap memory?

It is not normal behaviour.

> It certainly seem to have a performance impact for the ldap server.

Indeed.

>
>
>
> top - 21:31:51 up 52 days, 22:03,  2 users,  load average: 0.33, 0.15, 
> 0.07
> Tasks: 136 total,   1 running, 135 sleeping,   0 stopped,   0 zombie
> Cpu(s):  0.3%us,  0.7%sy,  0.0%ni, 92.7%id,  6.3%wa,  0.0%hi,  
> 0.0%si,  0.0%st
> Mem:   2055084k total,  1981892k used,    73192k free,      996k buffers
> Swap:  1048568k total,  1048568k used,        0k free,    17172k cached
>
>   PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
>  1347 dirsrv    20   0 3301m 1.4g 2736 S  0.3 70.0 340:27.17 ns-slapd
>
>
>
> Regards,
> Siggi
>
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