Re: [389-users] Performance tuning - where to begin?

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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@xxxxxxxxxxxxxxxxxxxxxxx [mailto:389-users-
>> bounces@xxxxxxxxxxxxxxxxxxxxxxx] 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@xxxxxxxxxxxxxxxxxxxxxxx
>> https://admin.fedoraproject.org/mailman/listinfo/389-users
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