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Re: Performance of MDB and BDB Please suggest?

Dear Experts,

Today we tried with to run the load with the below schema. We added about .6M entries in the DB.
Still our performance is severely poor. (10 TPS)

Can anybody review our slapd.conf file and point us where we are wrong, is there any other config we have missed out.

System we have is 64 bit 12 core machine RHEL having total memory of 49418952 kB.

dn: dc=example,dc=com
objectClass: dcObject
objectClass: organization
o: Example Company
dc: example

dn: cn=Manager0,dc=example,dc=com
objectClass: organizationalRole
cn: Manager0

Thanks and Regards


Insanity: Doing the same thing over and over again and expecting different results. Albert Einstein 

On Sat, Aug 25, 2012 at 2:37 PM, aryan rawat <aryanrawat24@gmail.com> wrote:
Hi ,
Chirs and Howard,
Please share the slapd.conf for MDB for which you have done the performance testing..

On Fri, Aug 24, 2012 at 11:46 PM, Howard Chu <hyc@symas.com> wrote:
Chris Card wrote:
>>>>> I am using openldap 2.4.32 on centos 6, on a 24 core box with 132 Gb RAM.
>>>>> My test directory has ~ 3 million entries, and I loaded it into mdb using
>>>> slapadd which took over 2 days (by comparison, the same load into bdb takes
>>>> 2-3 hours).
>>>> This is not normal. With slapadd -q MDB is faster than BDB assuming you're
>>>> using a decent filesystem and sensible mount options. JFS, EXT2, do better
>>>> than other filesystems in my tests. Very recent EXT4 may be better than EXT3
>>>> as well.
>>> The filesystem is xfs, mounted as a drbd device (although at the moment the other
>>> half of the drbd pair is not configured, so it doesn't have to wait for synchronous
>>> writes across the network)
>> Sounds like you're not using slapadd -q. Either that, or your filesystem cache
> Oh ****! You're quite right, I managed to lose the -q from the slapadd command when copy/pasting
> from a script. I'll try running it again with -q.
> Do you have an ETA for improvements to mdb write performance?

Not at this point. There are several approaches to test; most of them will
probably be dead ends.

  -- Howard Chu
  CTO, Symas Corp.           http://www.symas.com
  Director, Highland Sun     http://highlandsun.com/hyc/
  Chief Architect, OpenLDAP  http://www.openldap.org/project/

Attachment: slapd.conf
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