Re: scaling performance impact beyond 4 socket Intel CPU on Linux
From: Stefan Koehler <contact_at_soocs.de>
Date: Tue, 19 Apr 2016 19:55:22 +0200 (CEST)
Message-ID: <158081727.747862.1461088522500.JavaMail.open-xchange_at_app03.ox.hosteurope.de>
Hello Dave,
are you referring to NUMA scaling issues (Intel QPI)? If yes, then it is based on 3 QPI links per socket. Various sockets have no direct connection/link, which increases latency.
Date: Tue, 19 Apr 2016 19:55:22 +0200 (CEST)
Message-ID: <158081727.747862.1461088522500.JavaMail.open-xchange_at_app03.ox.hosteurope.de>
Hello Dave,
are you referring to NUMA scaling issues (Intel QPI)? If yes, then it is based on 3 QPI links per socket. Various sockets have no direct connection/link, which increases latency.
Best Regards
Stefan Koehler
Freelance Oracle performance consultant and researcher
Homepage: http://www.soocs.de
Twitter: _at_OracleSK
> Dave Moore <dsmoorekz0s_at_gmail.com> hat am 18. April 2016 um 20:30 geschrieben:
>
> Is there an Intel CPU scaling issue (non-linear performance), when using more than 4 sockets Intel CPU with Linux?
> If 'yes', then what are the background technical reasons for the non-linear scaling beyond 4 sockets Intel CPU?
> Understand each socket/chip can have many cores, for example 8
> corresponding to 32 total cores.
-- http://www.freelists.org/webpage/oracle-lReceived on Tue Apr 19 2016 - 19:55:22 CEST