I'm setting up a new installation of OpenLDAP 2.4.25 on RHEL machines each with 128GB RAM and 4 Intel Xeon E7530 CPUs (6 cores each, each core supporting two threads). /proc/cpuinfo shows there are 48 processors. The backend hdb database will eventually have millions of records with thousands of concurrent readers and writers. Is there a good equation to use for determining a value for threads and tool-threads? I'd like to take advantage of the hardware available. I get a warning if I set threads higher than 32:
olcThreads: value #0: warning, threads=48 larger than twice the default (2*16=32); YMMV.
I shouldn't be slapcat'ing and slapadd'ing it very often, but like to set tool-threads to an appropriate value for the hardware.
Any suggestions?
Thank you, Mark
--On Sunday, June 05, 2011 5:41 PM -0500 Mark mah042@gmail.com wrote:
I'm setting up a new installation of OpenLDAP 2.4.25 on RHEL machines each with 128GB RAM and 4 Intel Xeon E7530 CPUs (6 cores each, each core supporting two threads). /proc/cpuinfo shows there are 48 processors. The backend hdb database will eventually have millions of records with thousands of concurrent readers and writers. Is there a good equation to use for determining a value for threads and tool-threads? I'd like to take advantage of the hardware available. I get a warning if I set threads higher than 32:
olcThreads: value #0: warning, threads=48 larger than twice the default (2*16=32); YMMV.
I shouldn't be slapcat'ing and slapadd'ing it very often, but like to set tool-threads to an appropriate value for the hardware.
How many real cores do you have?
Generally tool-threads should be set to that number.
Generally threads should be set to no more than 4 threads per real core IIRC (8 is generally good for 1 or 2 cores, 16 for 4 cores, etc).
--Quanah
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Quanah Gibson-Mount Sr. Member of Technical Staff Zimbra, Inc A Division of VMware, Inc. -------------------- Zimbra :: the leader in open source messaging and collaboration
openldap-technical@openldap.org
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Mark -
Quanah Gibson-Mount