Re: Opensim-users Digest, Vol 19, Issue 1

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Re: Opensim-users Digest, Vol 19, Issue 1

Erik Bainbridge (Apollo Manga)
Re: Opensim-users Digest, Vol 19, Issue 1 Doug, thank you for your advice.  This has been a really tough decision for me.  I haven't found any solid information about this, so getting the benefit of your experience is a definite help.  

There are two related questions I'm wondering about.

1. Is a hyperthreaded Xeon E3 or E5 CPU with hyperthreading turned off in BIOS at any disadvantage compared with a non-hyperthreaded member of the same family?

2. Do you have any opinion about using a six core Xeon (E5-2630 v2)?  A dual CPU system is out of the question for me because of its power consumption.

I appreciate any replies.  I've been putting a lot of time into researching how best to build my new server but haven't been coming up with much solid information to go by about hyperthreading except for Doug's reply.


> Classification: UNCLASSIFIED
> Caveats: NONE
> No.
> v/r -doug
> Douglas Maxwell, Ph.D.
> Science and Technology Manager
> Virtual World Strategic Applications
> U.S. Army Research Lab
> Simulation & Training Technology Center (STTC)
> (c) (407) 242-0209
> -----Original Message-----
> From: [hidden email]
> [mailto:[hidden email]] On Behalf Of Erik Gordon
> Bainbridge
> Sent: Sunday, September 27, 2015 1:08 PM
> To: [hidden email]
> Subject: [Opensim-users] Is hyperthreading useful in an OpenSim server?
> I'm planning to build a new server for my grid and am wondering whether the
> virtual cores provided by hyperthreading (i7, some Xeons) are an advantage
> in an OpenSim server over a non-hyperthreaded CPU (i5, most Xeons)?
> My current server's i7 CPU has hyperthreading. I would like to test its
> effect on performance by disabling and enabling hyperthreading in the BIOS.
> Is there a more accurate way to test than using viewer fps and statistics?
> I'm currently running OpenSim 0.7.6 on OpenSUSE Linux (I will upgrade soon
> to the latest OpenSim).
> I've considered dual Xeons, but power consumption is a problem. If a
> non-hyperthreaded CPU performs as well or close to one that's hyperthreaded,
> then I might get a dual socket motherboard but wait to buy the second Xeon
> until my grid expands (it's possible to use a single CPU on at least some
> dual socket Supermicro boards).
> Thanks!  I appreciate any advice.

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