RE: Segfault during Auth Benchmark request

[Quanah Gibson-Mount <quanah@zimbra.com>]

--On Wednesday, April 22, 2009 10:52 AM +0200 "SAGNIMORTE Thomas (CAMPUS)" 
<thomas.sagnimorte@oxylane-group.com> wrote:

> Hi,
>
> I am using hdb backend.
>
> Here is the gdb backtrace
> Program received signal SIGSEGV, Segmentation fault.
> [Switching to Thread 1140881728 (LWP 31250)]
> 0x0000003c024082e9 in pthread_mutex_lock () from /lib64/libpthread.so.0

Hi Thomas,

This is not a backtrace, this just tells us where the segfault is being 
recorded from in gdb.  What we need is the output of "thr apply all bt" 
inside gdb after this happens.

Thanks!

> I set entry cache to 100000, idlcache to 10000 and dncache to 10000.

Seems reasonable.

--Quanah


> -----Original Message-----
> From: Quanah Gibson-Mount [mailto:quanah@zimbra.com]
> Sent: Tuesday, April 21, 2009 6:58 PM
> To: SAGNIMORTE Thomas (CAMPUS); openldap-technical@openldap.org
> Subject: Re: Segfault during Auth Benchmark request
>
> --On Tuesday, April 21, 2009 6:24 PM +0200 "SAGNIMORTE Thomas (CAMPUS)"
> <thomas.sagnimorte@oxylane-group.com> wrote:
>
> > Hi,
> >
> > I am working on building and benchmarking OpenLDAP v2.4.16 for a large
>
> > entries directory (actual test: 2 000 000 but final objective 10 000
> > 000 users).
> >
> > I use SLAMD to test authentication in order to evaluate what is the
> > maximum number of authentication I can do on my server. So I try to do
>
> > 5 authentications per 5ms during 5min.
> >
> > My OpenLDAP 2.4.16 is install on the X86 two core 2.8Ghz server with
> > 4Go of memory.
> >
> > I set 3Go in cache of DB_Config and I have look a lot on how configure
>
> > properly slapd.
> >
> > Is it normal because I have reach system limits or can I change some
> > parameter to optimize slapd performance?
> >
> > Do some people have some figures about slapd performance with large
> > entries directory on standard server?
>
> Where is the gdb backtrace of your segfault?
>
> Which slapd backend are you using? bdb? hdb? something else?  Did you
> properly tune the entry cache, idlcache, and dncache?
>
> --Quanah
>
> --
>
> Quanah Gibson-Mount
> Principal Software Engineer
> Zimbra, Inc
> --------------------
> Zimbra ::  the leader in open source messaging and collaboration



--

Quanah Gibson-Mount
Principal Software Engineer
Zimbra, Inc
--------------------
Zimbra ::  the leader in open source messaging and collaboration