GPU CORE22 0.0.2 coming to FAH - p11737-9 feedback thread

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Re: GPU CORE22 0.0.2 coming to FAH - p11737-9 feedback threa

Postby squads » Tue Feb 04, 2020 11:40 pm

yeah it seems a Radeon VII should be able to do better than 1.8-1.9M PPD on 11738, so your riser is probably costing you there. I have a Vega 56 that does 1.4M on those WU in a PCI3 x16 slot
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Re: GPU CORE22 0.0.2 coming to FAH - p11737-9 feedback threa

Postby Prettz » Wed Feb 05, 2020 4:18 pm

Seeing fairly wild fluctuating PPD on 11738 (0, 346, 39) on a GTX 1070 Ti. It's not pushing the GPU very hard, power and heat-wise. Jumping around between roughly 730k and 810k, which unfortunately happens to be the range of PPD I get from all of the core 21 projects. Not used to seeing fluctuations like that.

bruce wrote: Large atom-count projects generally need wider bandwidth so they tend to have degraded performance on Windows and/or with 1x risers.

What's the connection between Windows and PCI bandwidth?
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Re: GPU CORE22 0.0.2 coming to FAH - p11737-9 feedback threa

Postby bruce » Wed Feb 05, 2020 8:16 pm

There's really no direct connection. It also depends on what project we're talking about.

For a long time, FAH contended that PCIe bandwidth wasn't particularly important ... but projects have grown, requiring more data to move across the bus ... and GPUs have gotten faster, requiring a better supply of data (i.e.-bandwidth) to keep up with the speed of the computations.

1x risers or even a 4x slot can slow down a fast GPU when working on a large-atom-count-protein. Windows is less effective than Linux at utilizing all of the bandwidth that's actually avaiable.

If you've got a 16x 3.0 slot the bandwidth probably won't limit your GPU's computation capabilities but successive limitations become more an more important if you want to see progress limited entirely by the computational capabilities of your top-of-the-line GPU. Adding an additional moderate speed GPU on a moderate speed slot with the limitations imposed by Windows will be a positive benefit, but your mileage may vary.
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Re: GPU CORE22 0.0.2 coming to FAH - p11737-9 feedback threa

Postby Prettz » Thu Feb 06, 2020 2:13 am

bruce wrote:Windows is less effective than Linux at utilizing all of the bandwidth that's actually avaiable.

Adding an additional moderate speed GPU on a moderate speed slot with the limitations imposed by Windows will be a positive benefit, but your mileage may vary.

What limitations?
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Re: GPU CORE22 0.0.2 coming to FAH - p11737-9 feedback threa

Postby bruce » Thu Feb 06, 2020 4:39 pm

What limitations?


I don't think we need to get into a discussion of why MacOS or Linux or Windows is better than the other two. That's mostly a matter of preferences and this forum is aimed at helping people with difficulties getting FAH to work. Your choice of OS is a personal discision (aka "prejudice") and I'm sure we can find peopole who make other choices for equally prejudiced reasons, but we're not going to do that here.

The internal construction of how Windows handles moving data to/from the GPU is different than the internal construction of Linux. Device drivers, interrupt handlers, task schedulers, etc. are inherent parts of an OS and you're pretty much stuck with the performance of the aggregated results. Measurements show that Windows is less effective than Linux at utilizing all of the bandwidth that the hardware can actually provide.

Why? Because that's the way it was written.
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Re: GPU CORE22 0.0.2 coming to FAH - p11737-9 feedback threa

Postby n_w95482 » Fri Feb 14, 2020 8:52 am

I took a look at my logs yesterday and noticed that I'm now receiving core 22 WUs - this is without using the advanced flag. I received my first core 22 WU (p11737) on January 31st, with a steady trickle until about February 9th. Since then, I've mostly received core 22 work on both my GTX 1080 Ti and RX 580, all of it being p11737.

I haven't noticed much difference yet with the RX 580 in terms of performance or power consumption, but the 1080 Ti has had a marked increase in both PPD (~1.2-1.4m -> ~1.65m) and power consumption (80-90% TDP (250w) -> 98-111%).

The 1080 Ti is running 441.87 drivers from late December, and the RX 580 is running 20.1.1 from mid-January. Both cards have been perfectly stable, even with a custom clock/voltage curve on the 1080 Ti. I did have the RX 580 underclocked 7% for lower noise, but reverted to stock (1366 MHz) just now for testing. The 1080 Ti runs at 1999-2012 MHz.

I just enabled the advanced flag on both machines to see if p11738/11739 show up, as well as the new core 21 WUs. Fun stuff :).

Edit: Forgot to add that the 1080 Ti is sitting at 20-21% PCIe bus utilization (3.0 @ x16).
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Re: GPU CORE22 0.0.2 coming to FAH - p11737-9 feedback threa

Postby bruce » Fri Feb 14, 2020 5:45 pm

Thanks for the report.

FAHCore_22 is expected to provide improvements over what FAHCore_21 has provided, both scientifically and in GPU utilization. I expect that the current research being done with Core_21 will gradually be completed and new projects will be initiated on Core_22, so that Core_21 will gradually be phased out. (That's consistent with your report.)

I don't have a much data associated with GPU utilization factors associated with specific projects on specific GPUs. What GPU utilization do you observe, tabulated by project and GPU? Is the increase in PPD directly related to increased utilization percentage and power/heat? If more work is being done, PPD should increase. If not, then it shouldn't.
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Re: GPU CORE22 0.0.2 coming to FAH - p11737-9 feedback threa

Postby n_w95482 » Sat Feb 15, 2020 8:34 am

Unfortunately, I don't have specific numbers for prior projects as I wasn't paying too much attention to all of the details then, just that the 1080 Ti seemed to be averaging 80-90% of rated TDP most of the time, with GPU utilization % close to those numbers as well.

I'm unsure of the exact power consumption of the RX 580 as the numbers reported by AMD's API are usually all over the place for me, same with GPU utilization.

Here's what I've seen thus far from the projects that are the subject of this thread (also, this is my first time using HFM's Work Unit History viewer, very neat!):
1080 Ti
  • p11737: 69 WUs thus far (1 in progress), 1.57-1.66m PPD, 98-111% rated TDP, GPU utilization was usually about 97-98% IIRC. The power consumption exception is the one running right now (R6, C9, G126), which appears to be lighter on power consumption (88-92% TDP) but particularly heavy on memory bandwidth utilization (42-48%)
  • p11738: 2 WUs thus far, 1.36-1.4m PPD, unknown power/GPU utilization (I wasn't home when they ran)
  • p11739: 3 WUs thus far, 1.62-2.15m PPD, unknown power/GPU utilization (I wasn't home when they ran)

RX 580
  • p11737: 38 WUs thus far, 299k-313k PPD (most of that was underclocked)
  • p11738: 1 WU thus far (1 in progress), 565k PPD on the one that finished - the one in progress was paused for a couple of hours, currently at 474k. Power consumption/heat doesn't seem any higher than normal, at least based on the fan noise.
  • p11739: No WUs thus far

One other thing that I've noticed is that both with these core 22 WUs and the core 21 ones in advanced, my 1080 Ti's coil whine has been greatly reduced :D.
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