Re: [gridengine users] num_proc and hyperthreading

2016-07-19 Thread Rémy Dernat
Hi Reuti, William and Gowtham. So, I set 'slots' for each node which allow our users to benefit the additional threads or I create a script based on William idea to avoid the need to reboot all my nodes and turn HT off in the BIOS ? Both solutions are quite interesting. Thanks a lot, Best regar

Re: [gridengine users] num_proc and hyperthreading

2016-07-19 Thread Reuti
Hi, > Am 19.07.2016 um 10:22 schrieb Rémy Dernat : > > Hi, > > I have many nodes with hyperthreading enable. > I would like to know if modifying the complex value 'num_proc' or 'slots' Setting slots would be the way to go. > to the half of cores is the same thing that to disable the hyperthre

Re: [gridengine users] num_proc and hyperthreading

2016-07-19 Thread William Hay
On Tue, Jul 19, 2016 at 10:22:39AM +0200, R??my Dernat wrote: >Hi, >I have many nodes with hyperthreading enable. >I would like to know if modifying the complex value 'num_proc' or 'slots' >to the half of cores is the same thing that to disable the hyperthreading. >If not, what

Re: [gridengine users] num_proc and hyperthreading

2016-07-19 Thread Gowtham
Quick answer: No, they're not the same. Reason: If HT is not disabled but the num_proc or slots is set to half the available cores, the fake/virtual cores might still be used/assigned for computation. The result/performance could then depend on whether or not its corresponding real core is also bu

[gridengine users] num_proc and hyperthreading

2016-07-19 Thread Rémy Dernat
Hi, I have many nodes with hyperthreading enable. I would like to know if modifying the complex value 'num_proc' or 'slots' to the half of cores is the same thing that to disable the hyperthreading. If not, what is the difference ? Thanks, Best regards, Rémy _