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Message 13689 - Posted: 31 Mar 2015, 7:16:40 UTC - in response to Message 13688.  
Last modified: 31 Mar 2015, 7:20:20 UTC

Speedy wrote:
With discussion in previous post in regards to CPU and GPU utilisation would you still recommend keeping the CPU core free when using the GPU to process work?

I would recommend it. I just aborted a task which ran over 6 hours over night. After checking everything it seems that it had almost no GPU usage and all my cores were too busy with other tasks, so they couldn't feed the WU. Now, after clearing it out, the GPU usage is at max.

Janus wrote:
That is where those 0,412 originates from

My manager says it needs 0,587 cores. ;-)
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Message 13690 - Posted: 31 Mar 2015, 7:36:47 UTC - in response to Message 13689.  

Thanks. Shame to hear you lost 6 hours of processing time.

On a slight side note has anybody noticed a speed increase so far with this session since it is moved to GPU? It is hard for me to tell whether or not the processing has sped up
Have a crunching good day
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Message 13691 - Posted: 31 Mar 2015, 13:19:22 UTC - in response to Message 13690.  

On a slight side note has anybody noticed a speed increase so far with this session since it is moved to GPU?

I'm not quite sure either but just from feeling I would say it's at least a triple faster than before. ;-)
Surely Janus will know the exact numbers for it, as he can compare all old and new wus directly.
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Message 13692 - Posted: 31 Mar 2015, 14:14:34 UTC
Last modified: 31 Mar 2015, 14:17:07 UTC

Looks like the individual units are faster but there are fewer GPUs than CPUs available in the farm so the total speed for this session is somewhere around the same as before - maybe slightly faster. It does look like the rest of the sessions currently rendering have been speeding up because of the CPUs released from this one, though - so overall it looks like a fair increase in processing power could be possible with enough GPUs.

I haven't had time to pull the numbers just yet.
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Message 13697 - Posted: 31 Mar 2015, 22:13:54 UTC - in response to Message 13692.  
Last modified: 31 Mar 2015, 22:14:49 UTC

I just added a TITAN. That should help a little.

Question: Does this GPU app require double precision? I am wondering if increasing the DP setting would help or not.
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Message 13699 - Posted: 1 Apr 2015, 3:34:58 UTC - in response to Message 13692.  
Last modified: 1 Apr 2015, 3:36:24 UTC

Looks like the individual units are faster but there are fewer GPUs than CPUs available in the farm

Unfortunately, my nVidia is in my laptop, so it's only on a few hours a day and even then only a few days a week... I have two desktops with ATIs that would be eager to do some BURPing. And, there's also the Mac with an ATI...
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Message 13703 - Posted: 1 Apr 2015, 8:44:35 UTC - in response to Message 13697.  

Does this GPU app require double precision? I am wondering if increasing the DP setting would help or not.

As far as I know it is single precision floating point
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Message 13714 - Posted: 3 Apr 2015, 9:39:47 UTC - in response to Message 13703.  
Last modified: 3 Apr 2015, 9:49:32 UTC

I have only just started getting work for GPU today. Having CPU units running as high priority (because of low progress counter values or passed deadline) seems to prevent the scheduler from requesting GPU units if other projects are available for GPU.

The messages are similar to this: "BURP | Not requesting tasks: don't need (CPU: not highest priority project; NVIDIA GPU: not highest priority project)

Now that I have cleared my pending BURP CPU work units the scheduler has requested a new GPU Unit.
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Message 13717 - Posted: 5 Apr 2015, 1:50:57 UTC

Has the latest GPU app broke suspending? Every time it resumes from suspension, the duration starts from 0 again (I'm unsure if the actual render is starting from 0).

I'm reasonably sure this worked fine in the past.
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Message 13718 - Posted: 5 Apr 2015, 8:08:42 UTC - in response to Message 13717.  

I also see the GPU tasks restarting after being sustpended.
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Message 13720 - Posted: 6 Apr 2015, 0:21:09 UTC - in response to Message 13714.  
Last modified: 6 Apr 2015, 0:22:01 UTC

Having CPU units running as high priority (because of low progress counter values or passed deadline) seems to prevent the scheduler from requesting GPU units if other projects are available for GPU.


It looks like I was wrong about the CPU vs GPU scheduling above.
Over night I received a number of BURP GPU units while a high priority BURP CPU unit was active.
The priority of other GPU projects last week was most likely a time based priority while a very long BURP CPU work unit was running.
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Message 13732 - Posted: 9 Apr 2015, 18:08:21 UTC - in response to Message 13717.  

Has the latest GPU app broke suspending? Every time it resumes from suspension, the duration starts from 0 again (I'm unsure if the actual render is starting from 0).

I'm reasonably sure this worked fine in the past.


Have you had a chance to look at this Janus?
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Message 13733 - Posted: 10 Apr 2015, 17:39:08 UTC

Nope, not yet - I'm not too surprised that there are some issues with the GPU client, though, it is still fairly early in the dev cycle for it.
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Message 13734 - Posted: 11 Apr 2015, 0:52:12 UTC - in response to Message 13733.  

At least the render has sped up to 40 minutes per frame. At this rate, now it'll only take... let's see... 244 days!
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Message 13735 - Posted: 11 Apr 2015, 5:31:15 UTC - in response to Message 13734.  
Last modified: 11 Apr 2015, 5:32:06 UTC

I wish I could deliver more hosts, I'm intensively crunching the session on two GPUs since it started. ;-)
At least it did help me to finally reach the first credit million in a (relatively short) time period here. :-)
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Message 13789 - Posted: 30 Apr 2015, 19:55:53 UTC - in response to Message 13671.  

Depending on how much performance we're getting out of this we may be switching back to CPU rendering later in the session.

Hi, Janus. When you switch to the CPU client?
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Message 13802 - Posted: 5 May 2015, 0:16:06 UTC - in response to Message 13789.  

Depending on how much performance we're getting out of this we may be switching back to CPU rendering later in the session.

Hi, Janus. When you switch to the CPU client?

I am going to take an educated guess and answer your question. I would think that this session will get switched back to CPU if when there is no other CPU work to be done. Janus please correct me if I am wrong
Have a crunching good day
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Message 13803 - Posted: 5 May 2015, 8:19:44 UTC

Why not making a mixed session with CPU/GPU (if possible) when switching? Would probably accelerate the rendering even more.
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Message 13814 - Posted: 9 May 2015, 11:11:25 UTC
Last modified: 9 May 2015, 11:32:54 UTC

Really hoping to have enough time to do a Linux CUDA test on this one before it ends as it is almost a perfect test case; haven't had the time to look into it just yet.

The backend really doesn't like mixed-mode rendering yet. But we can switch back and forth between CPU/GPU as long as the CPU and GPU apps are the same version of Blender. We will stay in GPU mode for now, though.
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Message 13818 - Posted: 9 May 2015, 15:54:15 UTC - in response to Message 13814.  

...Linux CUDA...

This is good news. I look forward to will be tested.

We will stay in GPU mode for now, though.

I understand.
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