<html><head><meta http-equiv="Content-Type" content="text/html charset=windows-1252"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;"><div><br></div><div>Hi Paul,</div><div><br></div><div> It is not time critical, but we should probably take care of it before we forget about it. I’m CC-ing this discussion to the halld-online mailing list so anyone working on gluon47-gluon51 can speak up if rebooting one of these will cause them problems right now.</div><div><br></div><div> For the sake of scheduling, I suggest a time for doing this as first thing Thursday morning where “first thing” means whenever Paul comes in. I assume it will only take a few minutes per node. Paul, if this doesn’t work for you, please suggest another time. If anyone else needs this procedure to happen at a later time, let Paul and me know when a better time would be.</div><div><br></div><div>Regards,</div><div>-David</div><div><br></div><br><div><div>On May 14, 2014, at 11:22 AM, Paul Letta <<a href="mailto:letta@jlab.org">letta@jlab.org</a>> wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><style type="text/css">p { margin: 0; }</style><div><div style="font-family: arial, helvetica, sans-serif; font-size: 12pt;">I checked out gluon52. It was showing 16 logical CPUs... and they all had the HT flag set.<div>I took it down to BIOS and found HT was disabled. I enabled it.</div><div>It now shows 32 logical CPUs.</div><div><br></div><div>So we will need to plan a time that I can walk through the EMUs and fix them.</div><div><br></div><div>Paul</div><div><br></div><div><br></div><div><br><hr id="zwchr"><div style="font-weight: normal; font-style: normal; text-decoration: none; font-family: Helvetica, Arial, sans-serif; font-size: 12pt;"><b>From: </b>"Paul Letta" <<a href="mailto:letta@jlab.org">letta@jlab.org</a>><br><b>To: </b>"David Lawrence" <<a href="mailto:davidl@jlab.org">davidl@jlab.org</a>>, "David Abbott" <<a href="mailto:abbottd@jlab.org">abbottd@jlab.org</a>><br><b>Cc: </b>"Hovanes Egiyan" <<a href="mailto:hovanes@jlab.org">hovanes@jlab.org</a>><br><b>Sent: </b>Friday, May 9, 2014 11:48:46 AM<br><b>Subject: </b>Re: hyper threads on gluon47-gluon51<br><br><style>p { margin: 0; }</style><div style="font-family: arial, helvetica, sans-serif; font-size: 12pt;">They all have 16 cores each. So if HT is on, they should show as 32 cpus.. <div>gluon46-52 (16 core EMUs) (7 servers)</div><div>gluon104-111 (16 core farms) (8 servers)</div><div><br></div><div>should all show the same.</div><div><br></div><div>Did the HT get turned off on 47-51 because they are EMUs maybe?</div><div><br></div><div>Let me know, and I will be happy to go through them and turn HT on everywhere..</div><div><br></div><div>Also note: gluon53 is the 32 core AMD box -- no HT with it.</div><div><br></div><div>Paul</div><div><br></div><div><br><br><hr id="zwchr"><div style="font-weight: normal; font-style: normal; text-decoration: none; font-family: Helvetica, Arial, sans-serif; font-size: 12pt;"><b>From: </b>"David Lawrence" <<a href="mailto:davidl@jlab.org">davidl@jlab.org</a>><br><b>To: </b>"Paul Letta" <<a href="mailto:letta@jlab.org">letta@jlab.org</a>><br><b>Cc: </b>"Hovanes Egiyan" <<a href="mailto:hovanes@jlab.org">hovanes@jlab.org</a>><br><b>Sent: </b>Friday, May 9, 2014 10:53:36 AM<br><b>Subject: </b>hyper threads on gluon47-gluon51<br><br>Hi Paul and Hovanes,<br><br> When I look at gluon47-gluon51, I’m not seeing as many “processors” as I expect. These all show a total of 16 processors with the “ht” flag present. I assumed the “ht” flag meant that hyper threading was enabled. However, these machines indicate each core is in a group of only 8 siblings while for gluon46 as well as gluon104-gluon111, they indicate there are 16 siblings and a total of 32 processors (half of which I assume are real cores and the other half hyper threads). Paul, can you confirm that hyper threading is turned on for all of these nodes? Or, is there a reason it is off?<br><br>Regards,<br>-David</div><br></div></div></div><br></div></div></div></blockquote></div><br></body></html>