<html><head><title>Re: Opensim-users Digest, Vol 19, Issue 1</title>
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<span style=" font-family:'Arial'; font-size: 11pt;">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. <br>
<br>
There are two related questions I'm wondering about.<br>
<br>
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?<br>
<br>
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.<br>
<br>
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.<br>
<br>
Erik/Apollo<br>
<br>
> Classification: UNCLASSIFIED<br>
> Caveats: NONE<br>
><br>
> No.<br>
><br>
> v/r -doug<br>
><br>
> Douglas Maxwell, Ph.D.<br>
> Science and Technology Manager<br>
> Virtual World Strategic Applications<br>
> U.S. Army Research Lab<br>
> Simulation & Training Technology Center (STTC)<br>
> (c) (407) 242-0209<br>
><br>
><br>
><br>
> -----Original Message-----<br>
> From: opensim-users-bounces@opensimulator.org<br>
> [mailto:opensim-users-bounces@opensimulator.org] On Behalf Of Erik Gordon<br>
> Bainbridge<br>
> Sent: Sunday, September 27, 2015 1:08 PM<br>
> To: opensim-users@opensimulator.org<br>
> Subject: [Opensim-users] Is hyperthreading useful in an OpenSim server?<br>
><br>
> <br>
> I'm planning to build a new server for my grid and am wondering whether the<br>
> virtual cores provided by hyperthreading (i7, some Xeons) are an advantage<br>
> in an OpenSim server over a non-hyperthreaded CPU (i5, most Xeons)?<br>
><br>
> My current server's i7 CPU has hyperthreading. I would like to test its<br>
> effect on performance by disabling and enabling hyperthreading in the BIOS.<br>
> Is there a more accurate way to test than using viewer fps and statistics?<br>
> I'm currently running OpenSim 0.7.6 on OpenSUSE Linux (I will upgrade soon<br>
> to the latest OpenSim).<br>
><br>
> I've considered dual Xeons, but power consumption is a problem. If a<br>
> non-hyperthreaded CPU performs as well or close to one that's hyperthreaded,<br>
> then I might get a dual socket motherboard but wait to buy the second Xeon<br>
> until my grid expands (it's possible to use a single CPU on at least some<br>
> dual socket Supermicro boards).<br>
><br>
> Thanks! I appreciate any advice.<br>
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