Message boards :
Number crunching :
blanked AP - faster or slower
Message board moderation
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merle van osdol Send message Joined: 23 Oct 02 Posts: 809 Credit: 1,980,117 RAC: 0 |
Does it make any difference if you give a highly blanked AP to your faster or slower gpu? I would think not, but? |
Cosmic_Ocean Send message Joined: 23 Dec 00 Posts: 3027 Credit: 13,516,867 RAC: 13 |
At present, blanking is done on the CPU, which is considerably slower than a GPU. Blanked AP GPU tasks will take longer the more blanking there is. Soon, though, with the next release of the AP apps, blanking won't be an issue for GPUs. For now, yes, the more blanking there is, the longer the task will take. Linux laptop: record uptime: 1511d 20h 19m (ended due to the power brick giving-up) |
tbret Send message Joined: 28 May 99 Posts: 3380 Credit: 296,162,071 RAC: 40 |
Does it make any difference HUH? The short answer is "yes." The long answer is that your faster GPU will always be faster than the slow GPU, so any part of the blanked WU done on the GPU will go by faster... So if you are running two highly blanked AP units at the same time, it doesn't matter. If you are running one highly blanked and the other not, then the not-blanked will be quicker on the quicker card. |
HAL9000 Send message Joined: 11 Sep 99 Posts: 6534 Credit: 196,805,888 RAC: 57 |
I'm not sure you could actually force BOINC to only run highly blanked tasks on one of two GPUs. Well not without constantly micromanaging the system task by task. Any efficiency gains would probably be lost in the constant stopping and starting of tasks to try and move them around. SETI@home classic workunits: 93,865 CPU time: 863,447 hours Join the [url=http://tinyurl.com/8y46zvu]BP6/VP6 User Group[ |
merle van osdol Send message Joined: 23 Oct 02 Posts: 809 Credit: 1,980,117 RAC: 0 |
That's what I did. I moved the highly blanked task to the slower gpu and let the faster one run through many unblanked tasks. I don't know if it makes any difference in the sum total of 'points efficiency' or not. |
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