[389-users] Performance tuning - where to begin?
Daniel Fenert
daniel at fenert.pl
Thu Feb 10 11:18:32 UTC 2011
W dniu 03.02.2011 17:42, Gerrard Geldenhuis pisze:
> Hi Daniel,
> I am getting 1200 conn/sec on very old hardware so maybe something else is wrong.
>
> The very first thing to do is to run logconv.pl script which will come installed with 389. It has a flag for recommendations which I suggest you enable or just enable every flag.
>
> Sample command:
> logconv.pl /var/log/dirsrv/slapd-<hostname>/access -efcibaltnxrgjyp
>
> I don't yet understand all the errors that this tool reports but it is a good start.
>
> One other thing, I disabled log buffering at one stage to debug something. I forgot about this and then ended up debugging why the server was so slow until I realized that is what I had done. So make sure you have logbuffering enabled.
>
> dn: cn=config
> changetype: modify
> replace: nsslapd-accesslog-logbuffering
> nsslapd-accesslog-logbuffering: on
I've buffered logs, there's no problem with IO (below).
Are you sure that you have 1200 tcp connections/s to LDAP server? If
you've not mistaken connections/s with binds/s, then please tell me
what have you done to get this result?
# vmstat 5
procs -----------memory---------- ---swap-- -----io---- --system--
-----cpu------
r b swpd free buff cache si so bi bo in cs us sy
id wa st
.....
2 0 105388 15396 28320 6051316 0 0 10 573 5685 7408 24
4 72 0 0
2 0 105388 16012 28312 6050872 0 0 1 718 5891 7812 25
4 72 0 0
1 0 105388 16276 28328 6050336 0 0 8 662 5773 7518 24
4 72 0 0
4 0 105388 16464 28308 6050100 0 0 2 546 5577 7392 24
4 72 0 0
4 0 105388 15424 28324 6051228 0 0 6 665 5724 7480 23
4 73 0 0
> Regards
>
>> -----Original Message-----
>> From: 389-users-bounces at lists.fedoraproject.org [mailto:389-users-
>> bounces at lists.fedoraproject.org] On Behalf Of Daniel Fenert
>> Sent: 03 February 2011 16:30
>> To: General discussion list for the 389 Directory server project.
>> Subject: [389-users] Performance tuning - where to begin?
>>
>> Hi,
>>
>> I have performance problem on 389-ds server and don't really know where
>> to start fine tuning.
>>
>> My current setup is master (2xQuadCore, 8GB RAM), few read-only slaves.
>> It works (more or less) without problems, but I would like to migrate to
>> multi master (2 master servers).
>>
>> To check if one master will handle the whole load, I've tried switching
>> clients from slaves to master one by one.
>>
>> After switching clients from third slave, I've encountered weird problem
>> - master was about 50% busy (looking at the cpu, no IO waits), but there was
>> problem with new connections.
>> Looking at the network level - there was SYN from client, but no ACK until
>> one or two retransmissions of SYN.
>>
>> I've tried increasing thread number (from 30 to 60), but problem still exists.
>>
>> The problem is near 400-500 connections/second. My whole load is
>> ~750conn/sec. Looking at the CPU usage, this server should handle the load.
>> It works stable with load ~300conn/sec.
>>
>> There are plenty of configuration options, where should I look first?
>>
>> --
>> Daniel Fenert
>> --
>> 389 users mailing list
>> 389-users at lists.fedoraproject.org
>> https://admin.fedoraproject.org/mailman/listinfo/389-users
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