I'd probably need more details to understand what is seen, e.g. a graph over time of the CPU utilization of each core... I've been discussing with people in the past who were saying "not using" mistakingly :-)

-----Original Message----- From: Ulrich Windl [mailto:Ulrich.Windl@rz.uni-regensburg.de] Sent: Thursday, July 2, 2020 7:15 AM To: daniel.zuniga@gmail.com; Maucci, Cyrille cyrille.maucci@hpe.com; quanah@symas.com Cc: openldap-technical@openldap.org Subject: Antw: [EXT] RE: slapd 2.4.44 Performance problems

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"Maucci, Cyrille" cyrille.maucci@hpe.com schrieb am 01.07.2020 um 18:06 in

Nachricht <DF4PR8401MB0555595797F072395C494F66926C0@DF4PR8401MB0555.NAMPRD84.PROD.OUTLOOK. OM>:

I assume this is with back-bdb/hdb and is because Berkeley DB does not scale beyond 8 cores.

There's a difference between "not using" and "not scaling".

From: Daniel Zuniga [mailto:daniel.zuniga@gmail.com] Sent: Wednesday, July 1, 2020 3:43 PM To: Quanah Gibson-Mount quanah@symas.com Cc: openldap-technical@openldap.org Subject: Re: slapd 2.4.44 Performance problems

Is there a reason why OpenLDAP does not seem to use more than 8 cores regardless of the number of threads it is being told to use? With 16 threads it saturates 8 cores, 16 threads and 16 cores still uses 8 cores, 32 threads and 16 cores... only 8 cores are used.