I know I read this somewhere in the forum before but I just can't find it.

I am running 3 WUs against my GTX 780 and no CPU WUs.

I have listed 0.04 CPUs + .33 NVIDIA GPUs.

Would like to know if raising the CPUs part of this might be beneficial.

Thanks

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It would be beneficial. I hope someone will post the directions.

I am not hardcore enough, so I just let it be.

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Hey there.

I know how to do it. Just not sure if I should or what value to set it to.

Mike

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Hey there.

I know how to do it. Just not sure if I should or what value to set it to.

Mike

Well. The values add up. Right now you have 0.04 per task. Lets say you have 4 tasks, so 4 tasks times 0.04 is equal to 0.16, that means you are going to use 16% of one cpu core.

If you change 0.04 to 0.25, then each task will use 25% of one cpu core. If you run 4 tasks, then 4*0.25=1, 1 in this case means 100%, so 4 tasks will use one cpu core 100%.

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Thanks for your reply.

This is running on a i7 quad processor. I don't use this machine for anything other than crunching.

So does changing it to .25 per task worth it? I thought I read once that it wasn't necessary to do.

Mike

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Thanks for your reply.

This is running on a i7 quad processor. I don't use this machine for anything other than crunching.

So does changing it to .25 per task worth it? I thought I read once that it wasn't necessary to do.

Mike

Is it necessary? No.
Will it help if you increase it? I think so.

The real question is how much to increase it. That I don't know. Like I said earlier, I just don't care enough to spend time to figure it out.

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Thanks for your reply.

This is running on a i7 quad processor. I don't use this machine for anything other than crunching.

So does changing it to .25 per task worth it? I thought I read once that it wasn't necessary to do.

Mike

Assuming you're talking multiband rather than astropulse -- the CPU percentage is mainly a suggestion, it in no way forces a limit. Except, as has been noted, if the number of GPUs times the percentage is greater than unity then BOINC will drop a CPU to service the tasks. If you're not running CPU tasks it probably makes no odds; otherwise check with Task Manager or similar to see what the actual CPU percentage is per task, and adjust if necessary.

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I was just checking into task manager.

I agree.

I switched from .04 to .25 and restarted boinc. Task manager shows 8 CPUs at around 35%. So it looks like there is plenty of CPU to handle the GPU.

Thanks
Mike

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Just beacuse you can run 4 work units on a GPU does not mean you should. What good does running four do when you trash 2 or 3?

The point in tweaking is to start slow and see how YOUR rig handles it. Then go up by one and see what happens. Im sure that 780 can do 3 no problem. But jeez make sure it can do 2 first then 3. And then try 4 and MONITOR the SOB to make sure your not trashing work.

Maybe I should do 4 work units on my 550Tis and see how many wingmen I can P.O.

Edit- you now have 103 errors. And most of them you have aborted.

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Old James

Don't bother going beyond three per '780 as they start to bog down and produce errors.

First get used to the time it takes at one per card, allow the system to bed in just in case you have a problem card, then go to two per, freeing up a core on your CPU to feed, then the three per card, freeing up another core, then try freeing up a third CPU core, but at each stage take time (at least a week for each change to show its full impact on the RAC).

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Bob Smith
Member of Seti PIPPS (Pluto is a Planet Protest Society)
Somewhere in the (un)known Universe?

Just beacuse you can run 4 work units on a GPU does not mean you should. What good does running four do when you trash 2 or 3?

Or if doing 4 at a time results in less work per hour than doing 3 at a time.
The idea of doing multiple WUs at the same time, is that it means you are able to do more WUs per hour. However you quickly reach the point of diminishing returns.

With my GTX 460 & GTX 560Ti the sweet spot is 2 at a time. I could do 3 at a time if a had more video RAM, but even then i'd only be doing a couple of WUs per hour more. Running 2 at a time means i'm able to process several dozen per hour more than just running 1 at a time.

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Grant
Darwin NT

And I also like to add my two cents. Dont go by CPU and or GPU utiliazation numbers. Id be hapy as hell if I could run 7 work units and 2 work units on my GPU and have low utilization. It means Im running cool and not stressing my system.
Your running a 4770 K I have a 3770 I7. Just beacuse you have more horses under the hood does'nt mean you have to run flat out.

And look at the work you have trashed and or aborted the past few days.

Stop trying to max out your card. Settle for what gives good work.

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[/quote]

Old James

trashing work.

Sorry for the off-topic but what does "trashing work" mean?

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trashing work.

Sorry for the off-topic but what does "trashing work" mean?

Trashing work means that you're not producing valid results.

Cheers.

Hey there.

I know how to do it. Just not sure if I should or what value to set it to.

Mike

Well. The values add up. Right now you have 0.04 per task. Lets say you have 4 tasks, so 4 tasks times 0.04 is equal to 0.16, that means you are going to use 16% of one cpu core.

If you change 0.04 to 0.25, then each task will use 25% of one cpu core. If you run 4 tasks, then 4*0.25=1, 1 in this case means 100%, so 4 tasks will use one cpu core 100%.

The <avg_ncpus> and <max_ncpus> entries aren't config options, changing them won't make the x41zc Cuda app use any more CPU, Boinc uses those estimates to determine hour many CPU tasks to run,
once all the ncpus values add up to more than One, Boinc will then schedule one less CPU task,

Jason was very particular about reducing CPU usage, there is no need to try and increase it, Change the app's priority in the mbcuda.cfg from the default 'Below Normal' to 'Normal' or 'Above Normal' Instead.

Claggy

OP, as with overclocking you have to find your own sweet spot. With exact same machines running the exact programs there will be a difference because of manufacturing tolerances. You have to find your own settings.

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It is all in the process of learning :)

I trashed the WUs yes, but now I know a lot more than a did.

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Ok and it's ok to settle down there. You sound mad and that's no good.

Feel free to ignore this thread if it upsets you.

Mike

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