Hi, Do we need HT enabled on CentOS release 5.5 (Final) and Kernel Version :- 2.6.18-194.el5 Please help me understand the pros and cons of having HT enabled or disabled on the Server Dell R 710. cat /proc/cpuinfo -> http://fpaste.org/K2dT/ Do let me know if anyone needs more information. Regards, Kaushal
On Fri, Mar 09, 2012 at 11:15:29AM +0530, Kaushal Shriyan wrote:> Hi, > > Do we need HT enabled on CentOS release 5.5 (Final) and Kernel Version :- > 2.6.18-194.el5I don't think it harms anything to have it enabled, and there may be some small performance gains in some cases. I'd leave it on.> Please help me understand the pros and cons of having HT enabled or > disabled on the Server Dell R 710. > > cat /proc/cpuinfo -> http://fpaste.org/K2dT/ > > Do let me know if anyone needs more information. > > Regards, > > Kaushal > _______________________________________________ > CentOS mailing list > CentOS at centos.org > http://lists.centos.org/mailman/listinfo/centos-- ---- Fred Smith -- fredex at fcshome.stoneham.ma.us ----------------------------- "Not everyone who says to me, 'Lord, Lord,' will enter the kingdom of heaven, but only he who does the will of my Father who is in heaven." ------------------------------ Matthew 7:21 (niv) -----------------------------
On Fri, Mar 9, 2012 at 1:35 PM, Sorin Srbu <sorin.srbu at orgfarm.uu.se> wrote:> -----Original Message----- > From: centos-bounces at centos.org [mailto:centos-bounces at centos.org] On > Behalf > Of John R Pierce > Sent: den 9 mars 2012 08:54 > To: centos at centos.org > Subject: Re: [CentOS] HT (Hyper Threading) on CentOS 5.5 > > On 03/08/12 11:44 PM, Sorin Srbu wrote: > > I know there might be some negative performance issues with certain > > applications, but would you notice it in day-to-day use? >Hi Pierce > if you're using the server for pure floating point compute, don't run > more threads than you have actual cores. Not sure i understand about your earlier comment regarding pure floating point compute, help me understand with some examples. Regards Kaushal
On 03/08/2012 11:45 PM, Kaushal Shriyan wrote:> Hi, > > Do we need HT enabled on CentOS release 5.5 (Final) and Kernel Version :- > 2.6.18-194.el5 > Please help me understand the pros and cons of having HT enabled or > disabled on the Server Dell R 710. > > cat /proc/cpuinfo -> http://fpaste.org/K2dT/ > > Do let me know if anyone needs more information. >Hyperthreading is not enabled or disabled in CentOS ... it is something that you enable or disable on your machine in the computers BIOS settings. If Hypertheading is enabled in your BIOS, then CentOS sees 2x the processors from your machine at boot up time. -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 262 bytes Desc: OpenPGP digital signature URL: <http://lists.centos.org/pipermail/centos/attachments/20120309/c61487c2/attachment-0004.sig>
On Friday, March 09, 2012 04:33:30 AM John R Pierce wrote:> gaming uses the graphics card for rendering, yes. by 'rendering', I > was thinking more of production rendering, like Pixar does when making a > movie, using clusters of 100s of multicore nodes to render frames.The same engine that renders for games works very well rendering for CG animation for movies, and nVidia's Tesla and other CUDA GPU's pretty much own this space. A single Tesla can outperform a dozen general-purpose compute nodes in production rendering workloads. Note that the Tesla cards don't even have a video output.