Message boards :
Number crunching :
Topic revisited -- CPU frequency/scaling with Linux
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michael37 Send message Joined: 23 Jul 99 Posts: 311 Credit: 6,955,447 RAC: 0 |
Some users running Seti on their notebooks observed that their CPU clock speed reduced to the lowest. This happens because, under some conditions, Linux does not consider 'nice' (aka low priority) processes as CPU load. This happens even if the notebook is plugged in the AC. This is a great compromise for less heat+longevity of your notebook vs raw crunching power. Note: this works only for newer versions of Linux. cd /sys/devices/system/cpu/cpu0/cpufreq/ondemand more ignore_nice_load If this is set to 1, then your CPU speed will scale down when runnig Seti only. If this is set to 0, then you CPU will run at full speed when running Seti. You can change this value right there, but it won't persist through reboots. How to change it for gnome-based systems: Run gconf-editor go to /apps/gnome-power-manager/cpufreq check box consider_nice. Takes effect immediately. |
Natronomonas Send message Joined: 13 Apr 02 Posts: 176 Credit: 3,367,602 RAC: 0 |
Thanks, I actually had that problem with a C2D desktop - on niced loads it always downclocked. I got around it by disabling EIST etc in the BIOS, since this PC was always *meant* to be running at 100% anyway. However, especially for a laptop, you'd want that functionality, and a software change is probably a bit less drastic. Annoying that it doesn't persist, though. Crunching SETI@Home as a member of the Whirlpool BOINC Teams |
michael37 Send message Joined: 23 Jul 99 Posts: 311 Credit: 6,955,447 RAC: 0 |
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Desti Send message Joined: 28 Feb 03 Posts: 123 Credit: 519,284 RAC: 1 |
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