topic Disable Hyperthreading still advised in QV 11? in QlikView https://community.qlik.com/t5/QlikView/Disable-Hyperthreading-still-advised-in-QV-11/m-p/325427#M1277520 <HTML><HEAD></HEAD><BODY><P>I don't believe this has changed in QV11. There is a scalability group though <A _jive_internal="true" href="https://community.qlik.com/groups/qlikview-scalability">http://community.qlik.com/groups/qlikview-scalability</A>, if you ask there someone might have more information on this.</P></BODY></HTML> Tue, 28 Feb 2012 19:12:16 GMT danielrozental 2012-02-28T19:12:16Z Disable Hyperthreading still advised in QV 11? https://community.qlik.com/t5/QlikView/Disable-Hyperthreading-still-advised-in-QV-11/m-p/325426#M1277519 <HTML><HEAD></HEAD><BODY><P>Hi!</P><P></P><P>I know this rule was valid for 8.5 and 9.0.</P><P>Is it advised to disable Intel's hyperthreading with QV11? (servers and developer's PCs)</P><P></P><P>regards</P></BODY></HTML> Mon, 26 Jan 2026 18:19:17 GMT https://community.qlik.com/t5/QlikView/Disable-Hyperthreading-still-advised-in-QV-11/m-p/325426#M1277519 2026-01-26T18:19:17Z Disable Hyperthreading still advised in QV 11? https://community.qlik.com/t5/QlikView/Disable-Hyperthreading-still-advised-in-QV-11/m-p/325427#M1277520 <HTML><HEAD></HEAD><BODY><P>I don't believe this has changed in QV11. There is a scalability group though <A _jive_internal="true" href="https://community.qlik.com/groups/qlikview-scalability">http://community.qlik.com/groups/qlikview-scalability</A>, if you ask there someone might have more information on this.</P></BODY></HTML> Tue, 28 Feb 2012 19:12:16 GMT https://community.qlik.com/t5/QlikView/Disable-Hyperthreading-still-advised-in-QV-11/m-p/325427#M1277520 danielrozental 2012-02-28T19:12:16Z Disable Hyperthreading still advised in QV 11? https://community.qlik.com/t5/QlikView/Disable-Hyperthreading-still-advised-in-QV-11/m-p/325428#M1277521 <HTML><HEAD></HEAD><BODY><P>I asked QT this recently and was told it hadn't changed.</P></BODY></HTML> Tue, 28 Feb 2012 19:53:07 GMT https://community.qlik.com/t5/QlikView/Disable-Hyperthreading-still-advised-in-QV-11/m-p/325428#M1277521 2012-02-28T19:53:07Z Re: Disable Hyperthreading still advised in QV 11? https://community.qlik.com/t5/QlikView/Disable-Hyperthreading-still-advised-in-QV-11/m-p/325429#M1277522 <HTML><HEAD></HEAD><BODY><P>Note that in some environments disabling Hyperthreading doesn't seem to make any difference but sometimes the difference it can make is vast.</P></BODY></HTML> Thu, 01 Mar 2012 15:32:10 GMT https://community.qlik.com/t5/QlikView/Disable-Hyperthreading-still-advised-in-QV-11/m-p/325429#M1277522 dde 2012-03-01T15:32:10Z Disable Hyperthreading still advised in QV 11? https://community.qlik.com/t5/QlikView/Disable-Hyperthreading-still-advised-in-QV-11/m-p/325430#M1277523 <HTML><HEAD></HEAD><BODY><P>That's very true. It depends on the size of the L1 cache as hyperthreading simply splits it in half to make a single processor appear as if it were 2. If the L1 is too small, splitting it can mean the processing pages QV is writing are too large for the available cache and they get writen to RAM instead which is many times slower. The effect is similar to running out of available physical RAM and data being writen to page files instead.</P><P></P><P>I've seen reload times half in some environments simply by turning hyperthreading off and in others not seen any noticable difference at all. </P></BODY></HTML> Fri, 02 Mar 2012 22:15:43 GMT https://community.qlik.com/t5/QlikView/Disable-Hyperthreading-still-advised-in-QV-11/m-p/325430#M1277523 2012-03-02T22:15:43Z Disable Hyperthreading still advised in QV 11? https://community.qlik.com/t5/QlikView/Disable-Hyperthreading-still-advised-in-QV-11/m-p/325431#M1277524 <HTML><HEAD></HEAD><BODY><P>Thanks for the explanation Matt. I've always wondered why and under what circumstances it made a difference.</P><P></P><P>-Rob</P></BODY></HTML> Sat, 03 Mar 2012 01:58:25 GMT https://community.qlik.com/t5/QlikView/Disable-Hyperthreading-still-advised-in-QV-11/m-p/325431#M1277524 rwunderlich 2012-03-03T01:58:25Z Disable Hyperthreading still advised in QV 11? https://community.qlik.com/t5/QlikView/Disable-Hyperthreading-still-advised-in-QV-11/m-p/325432#M1277525 <HTML><HEAD></HEAD><BODY><P>It puzzled me for a while Rob until I spotted it was linked to the processor and finally narrowed it down to the L1. </P></BODY></HTML> Sat, 03 Mar 2012 20:46:43 GMT https://community.qlik.com/t5/QlikView/Disable-Hyperthreading-still-advised-in-QV-11/m-p/325432#M1277525 2012-03-03T20:46:43Z Disable Hyperthreading still advised in QV 11? https://community.qlik.com/t5/QlikView/Disable-Hyperthreading-still-advised-in-QV-11/m-p/325433#M1277526 <HTML><HEAD></HEAD><BODY><P>Thanks Matt. </P><P></P><P>I got a bit of idea on it too..</P><P></P><P></P><P>Deepak</P></BODY></HTML> Sun, 04 Mar 2012 11:34:22 GMT https://community.qlik.com/t5/QlikView/Disable-Hyperthreading-still-advised-in-QV-11/m-p/325433#M1277526 deepakk 2012-03-04T11:34:22Z