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Which "on multiprocessors, use at most" line to use
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Glenn Green Send message Joined: 14 May 99 Posts: 32 Credit: 7,370,787 RAC: 0 |
and why are there two of them. I cannot see the difference... I have a quad core, with hyperthreading. Do I count that as 4 processors or 8? I have an ATI card that can do GPU crunching, and I am trying to decide how many processors or cores to keep free... Does the GPU need an actual core free or is a hyperthread enough? Fear is a path to the Dark Side: Fear leads to Anger; Anger leads to Hate; Hate leads to Suffering. ~ Master Yoda, a long time ago in a galaxy far, far away. |
rob smith Send message Joined: 7 Mar 03 Posts: 22199 Credit: 416,307,556 RAC: 380 |
Your processor effectively has 8 processors and by default SETI@Home will use them all for "CPU" tasks. That is, by default, it will run 8 tasks on the CPU and one on the GPU. Not being familiar with the ATI GPUs I can't say if you need to set aside a CPU core or not, but I'm sure someone will be along soon to answer that part of your question. Bob Smith Member of Seti PIPPS (Pluto is a Planet Protest Society) Somewhere in the (un)known Universe? |
Glenn Green Send message Joined: 14 May 99 Posts: 32 Credit: 7,370,787 RAC: 0 |
But why the two separate lines in the preferences? They both seem the same, except one uses % and the other is an integer. I have 75% selected now, and am running 6 tasks. I assume that is 3 processors and 3 hyperthreads, but I don't know how to tell for sure. Fear is a path to the Dark Side: Fear leads to Anger; Anger leads to Hate; Hate leads to Suffering. ~ Master Yoda, a long time ago in a galaxy far, far away. |
OzzFan Send message Joined: 9 Apr 02 Posts: 15691 Credit: 84,761,841 RAC: 28 |
Yes, ATi users should set aside a CPU core for their GPUs. There are two separate line items for the same preference because the integer one is for older versions of BOINC (for example, the last version of BOINC that would run on Windows Domain Controllers was v5.10.45 which uses this option). Newer versions of BOINC (as the preference says, v6.1+) support the percentage preference, so it should be set for newer versions. |
Glenn Green Send message Joined: 14 May 99 Posts: 32 Credit: 7,370,787 RAC: 0 |
Thanks. 75% runs 6 CPU tasks at a time, and keeps one core (two processors) free for the ATI card. I only see AP units on the graphics card, but I have had several in the past few days... Fear is a path to the Dark Side: Fear leads to Anger; Anger leads to Hate; Hate leads to Suffering. ~ Master Yoda, a long time ago in a galaxy far, far away. |
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