Author Topic: [Split] PowerSpectrum Unit Test (Read 164816 times)

Jason G · « **Reply #30 on:** 19 Nov 2010, 06:06:32 am »

A source of a subtle stock code precision variation on pre-Fermi cards found, will test patch mod1 & mod3 & leave stock alone, probably fix mod2 but leave precision un-fixed as a test (fixing mod2 will make it slower anyway)

[A Bit Later:] Updated first post:

Quote

[Updated] Mod3_UnitTest attached, changed both mods & added a third
Mod1: Tuned precision such that non-Fermi & Fermi match, and exceed stock pre-fermi precision
Mod2: Fixed, but sadly is slow now, remains at stock accuracy
Mod3: As with Mod1, adding extra threads & split loads (May be suitable for some ranges of cards)

Some variation on #1 and/or #3 may need to end up contributing to a stock update down the road due to the stock code (very tiny) precision mismatch on CPU Vs PreFermi Vs Fermi ). The issue could be a contributor to the 'dodgy Gaussians', time will tell whether that's the case or not.

glennaxl · « **Reply #31 on:** 19 Nov 2010, 11:40:16 am »

-device 0
Device: GeForce GTX 295, 1476 MHz clock, 874 MB memory.
Compute capability 1.3
Compiled with CUDA 3020.
Stock GetPowerSpectrum():
64 threads: 26.5 GFlops 10.6 GB/s 1183.3ulps

GetPowerSpectrum() mod 1: (made Fermi & Pre-Fermi match in accuracy.)
32 threads: 18.5 GFlops 7.4 GB/s 121.7ulps
64 threads: 26.5 GFlops 10.6 GB/s 121.7ulps
128 threads: 26.7 GFlops 10.7 GB/s 121.7ulps
256 threads: 26.7 GFlops 10.7 GB/s 121.7ulps

GetPowerSpectrum() mod 2 (fixed, but slow):
32 threads: 6.2 GFlops 2.5 GB/s 1183.3ulps
64 threads: 6.3 GFlops 2.5 GB/s 1183.3ulps
128 threads: 6.2 GFlops 2.5 GB/s 1183.3ulps
256 threads: 6.2 GFlops 2.5 GB/s 1183.3ulps

GetPowerSpectrum() mod 3: (As with mod1, +threads & split loads)
32 threads: 18.5 GFlops 7.4 GB/s 121.7ulps
64 threads: 26.5 GFlops 10.6 GB/s 121.7ulps
128 threads: 26.7 GFlops 10.7 GB/s 121.7ulps
256 threads: 26.7 GFlops 10.7 GB/s 121.7ulps
512 threads: 26.6 GFlops 10.7 GB/s 121.7ulps
1024 threads: N/A

-device 1
Device: GeForce GTX 295, 1476 MHz clock, 873 MB memory.
Compute capability 1.3
Compiled with CUDA 3020.
Stock GetPowerSpectrum():
64 threads: 26.1 GFlops 10.4 GB/s 1183.3ulps

GetPowerSpectrum() mod 1: (made Fermi & Pre-Fermi match in accuracy.)
32 threads: 18.4 GFlops 7.4 GB/s 121.7ulps
64 threads: 26.1 GFlops 10.4 GB/s 121.7ulps
128 threads: 26.3 GFlops 10.5 GB/s 121.7ulps
256 threads: 26.4 GFlops 10.5 GB/s 121.7ulps

GetPowerSpectrum() mod 2 (fixed, but slow):
32 threads: 6.1 GFlops 2.4 GB/s 1183.3ulps
64 threads: 6.2 GFlops 2.5 GB/s 1183.3ulps
128 threads: 6.2 GFlops 2.5 GB/s 1183.3ulps
256 threads: 6.2 GFlops 2.5 GB/s 1183.3ulps

GetPowerSpectrum() mod 3: (As with mod1, +threads & split loads)
32 threads: 18.5 GFlops 7.4 GB/s 121.7ulps
64 threads: 25.9 GFlops 10.3 GB/s 121.7ulps
128 threads: 26.0 GFlops 10.4 GB/s 121.7ulps
256 threads: 26.4 GFlops 10.6 GB/s 121.7ulps
512 threads: 26.4 GFlops 10.6 GB/s 121.7ulps
1024 threads: N/A

-device 2
Device: GeForce GTX 260, 1487 MHz clock, 874 MB memory.
Compute capability 1.3
Compiled with CUDA 3020.
Stock GetPowerSpectrum():
64 threads: 25.5 GFlops 10.2 GB/s 1183.3ulps

GetPowerSpectrum() mod 1: (made Fermi & Pre-Fermi match in accuracy.)
32 threads: 18.7 GFlops 7.5 GB/s 121.7ulps
64 threads: 25.6 GFlops 10.2 GB/s 121.7ulps
128 threads: 25.9 GFlops 10.4 GB/s 121.7ulps
256 threads: 25.9 GFlops 10.4 GB/s 121.7ulps

GetPowerSpectrum() mod 2 (fixed, but slow):
32 threads: 5.9 GFlops 2.4 GB/s 1183.3ulps
64 threads: 6.1 GFlops 2.4 GB/s 1183.3ulps
128 threads: 6.0 GFlops 2.4 GB/s 1183.3ulps
256 threads: 5.9 GFlops 2.4 GB/s 1183.3ulps

GetPowerSpectrum() mod 3: (As with mod1, +threads & split loads)
32 threads: 18.7 GFlops 7.5 GB/s 121.7ulps
64 threads: 25.6 GFlops 10.2 GB/s 121.7ulps
128 threads: 25.9 GFlops 10.4 GB/s 121.7ulps
256 threads: 25.9 GFlops 10.4 GB/s 121.7ulps
512 threads: 25.8 GFlops 10.3 GB/s 121.7ulps
1024 threads: N/A

M_M · « **Reply #32 on:** 19 Nov 2010, 11:42:05 am »

Device: GeForce GTX 460, 810 MHz clock, 993 MB memory.
Compute capability 2.1
Compiled with CUDA 3020.
Stock GetPowerSpectrum():
   64 threads: 14.7 GFlops 5.9 GB/s 0.0ulps

GetPowerSpectrum() mod 1: (made Fermi & Pre-Fermi match in a
   32 threads: 8.1 GFlops 3.2 GB/s 121.7ulps
   64 threads: 14.5 GFlops 5.8 GB/s 121.7ulps
   128 threads: 22.2 GFlops 8.9 GB/s 121.7ulps
   256 threads: 26.2 GFlops 10.5 GB/s 121.7ulps

GetPowerSpectrum() mod 2 (fixed, but slow):
   32 threads: 9.4 GFlops 3.8 GB/s 0.0ulps
   64 threads: 12.2 GFlops 4.9 GB/s 0.0ulps
   128 threads: 14.7 GFlops 5.9 GB/s 0.0ulps
   256 threads: 14.3 GFlops 5.7 GB/s 0.0ulps

GetPowerSpectrum() mod 3: (As with mod1, +threads & split lo
   32 threads: 7.6 GFlops 3.0 GB/s 121.7ulps
   64 threads: 14.0 GFlops 5.6 GB/s 121.7ulps
   128 threads: 21.5 GFlops 8.6 GB/s 121.7ulps
   256 threads: 20.8 GFlops 8.3 GB/s 121.7ulps
   512 threads: 20.0 GFlops 8.0 GB/s 121.7ulps
   1024 threads: 17.5 GFlops 7.0 GB/s 121.7ulps

Miep · « **Reply #33 on:** 19 Nov 2010, 11:56:46 am »

Device: Quadro FX 570M, 950 MHz clock, 242 MB memory.
Compute capability 1.1
Compiled with CUDA 3020.
Stock GetPowerSpectrum():
     64 threads:        4.6 GFlops    1.8 GB/s 1183.3ulps


GetPowerSpectrum() mod 1: (made Fermi & Pre-Fermi match in accuracy.)
     32 threads:        2.9 GFlops    1.2 GB/s 121.7ulps
     64 threads:        4.3 GFlops    1.7 GB/s 121.7ulps
    128 threads:        4.3 GFlops    1.7 GB/s 121.7ulps
    256 threads:        4.3 GFlops    1.7 GB/s 121.7ulps


GetPowerSpectrum() mod 2 (fixed, but slow):
     32 threads:        0.8 GFlops    0.3 GB/s 1183.3ulps
     64 threads:        0.7 GFlops    0.3 GB/s 1183.3ulps
    128 threads:        0.7 GFlops    0.3 GB/s 1183.3ulps
    256 threads:        0.7 GFlops    0.3 GB/s 1183.3ulps


GetPowerSpectrum() mod 3: (As with mod1, +threads & split loads)
     32 threads:        3.0 GFlops    1.2 GB/s 121.7ulps
     64 threads:        4.4 GFlops    1.8 GB/s 121.7ulps
    128 threads:        4.4 GFlops    1.7 GB/s 121.7ulps
    256 threads:        4.3 GFlops    1.7 GB/s 121.7ulps
    512 threads:        3.3 GFlops    1.3 GB/s 121.7ulps
   1024 threads: N/A

Oh, look, I'm faster than an ION...
And look how horrible even mod3 is a whole 5% slower than stock. That's 4 minutes on a 90' task. Which means I'd diminish throughput by one task per 4-5 days. Simply outrageous.

Jason G · « **Reply #34 on:** 19 Nov 2010, 12:08:27 pm »

LoL, don't worry, we'll put a crappy stock codepath in just for you

[Edit:] I'm leaning toward the simpler Mod1 Kernel for the rest of us. On the Fermi's at least there is some cache control to play with yet, but then the denser threadcount of Mod3, at little cost, may allow more active kernels to fit on the Fermi GPU concurrently... Hmmm....

Claggy · « **Reply #35 on:** 19 Nov 2010, 01:22:41 pm »

My 9800GTX+'s rerun:

Device: GeForce 9800 GTX/9800 GTX+, 1900 MHz clock, 496 MB memory.
Compute capability 1.1
Compiled with CUDA 3020.
Stock GetPowerSpectrum():
64 threads: 16.2 GFlops 6.5 GB/s 1183.3ulps

GetPowerSpectrum() mod 1: (made Fermi & Pre-Fermi match in accuracy.)
32 threads: 15.2 GFlops 6.1 GB/s 121.7ulps
64 threads: 16.2 GFlops 6.5 GB/s 121.7ulps
128 threads: 15.9 GFlops 6.4 GB/s 121.7ulps
256 threads: 15.8 GFlops 6.3 GB/s 121.7ulps

GetPowerSpectrum() mod 2 (fixed, but slow):
32 threads: 2.7 GFlops 1.1 GB/s 1183.3ulps
64 threads: 2.6 GFlops 1.1 GB/s 1183.3ulps
128 threads: 2.6 GFlops 1.1 GB/s 1183.3ulps
256 threads: 2.5 GFlops 1.0 GB/s 1183.3ulps

GetPowerSpectrum() mod 3: (As with mod1, +threads & split loads)
32 threads: 15.2 GFlops 6.1 GB/s 121.7ulps
64 threads: 16.2 GFlops 6.5 GB/s 121.7ulps
128 threads: 15.9 GFlops 6.4 GB/s 121.7ulps
256 threads: 15.9 GFlops 6.3 GB/s 121.7ulps
512 threads: 15.1 GFlops 6.0 GB/s 121.7ulps
1024 threads: N/A

Claggy

Edit: and my 128Mb 8400M GS:

Device: GeForce 8400M GS, 800 MHz clock, 114 MB memory.
Compute capability 1.1
Compiled with CUDA 3020.
Stock GetPowerSpectrum():
64 threads: 1.2 GFlops 0.5 GB/s 1183.3ulps

GetPowerSpectrum() mod 1: (made Fermi & Pre-Fermi match in accuracy.)
32 threads: 1.2 GFlops 0.5 GB/s 121.7ulps
64 threads: 1.2 GFlops 0.5 GB/s 121.7ulps
128 threads: 1.2 GFlops 0.5 GB/s 121.7ulps
256 threads: 1.2 GFlops 0.5 GB/s 121.7ulps

GetPowerSpectrum() mod 2 (fixed, but slow):
32 threads: 0.3 GFlops 0.1 GB/s 1183.3ulps
64 threads: 0.3 GFlops 0.1 GB/s 1183.3ulps
128 threads: 0.3 GFlops 0.1 GB/s 1183.3ulps
256 threads: 0.2 GFlops 0.1 GB/s 1183.3ulps

GetPowerSpectrum() mod 3: (As with mod1, +threads & split loads)
32 threads: 1.2 GFlops 0.5 GB/s 121.7ulps
64 threads: 1.2 GFlops 0.5 GB/s 121.7ulps
128 threads: 1.2 GFlops 0.5 GB/s 121.7ulps
256 threads: 1.2 GFlops 0.5 GB/s 121.7ulps
512 threads: 1.2 GFlops 0.5 GB/s 121.7ulps
1024 threads: N/A

M_M · « **Reply #36 on:** 19 Nov 2010, 01:30:12 pm »

Very strange the both 9800GTX+ and GTX260 seems to be faster then GTX460, since in every game and benchmark GTX460 wins... something's wrong...

Also, what is the "clock" measurement, as displayed in this test? Is it a shader clock? If it is, why is it showing just 810MHz for me, it should be much higher.

Miep · « **Reply #37 on:** 19 Nov 2010, 01:36:13 pm »

Looks like 256 gets best performance out of fermis with no or only little loss for smaller cards.

Jason G · « **Reply #38 on:** 19 Nov 2010, 01:46:12 pm »

Quote from: M_M on 19 Nov 2010, 01:30:12 pm

Very strange the both 9800GTX+ and GTX260 seems to be faster then GTX460, since in every game and benchmark GTX460 wins... something's wrong...

Also, what is the "clock" measurement, as displayed in this test? Is it a shader clock? If it is, why is it showing just 810MHz for me, it should be much higher.

The clock rate is just what the driver/library reports, which is some fixed number & doesn't measure any hardware (or mean much other than some general indication of the original core spec).

As far as GTX 260 Vs 9800GTX+ Vs GTX 460 goes, quite right

but not strange at all, This is a 'memory bound' kernel, almost purely instead of 'compute bound'. That makes it not overly dependant on the processing speed of the GPU at all, but instead on the specific memory implementation, clocks & quality of the RAM chips used, as well as the kernel playing around I've been trying out.

So for that reason, this should be taken as a comparison of memory bound operations on different cards, and relative memory subsystem performance of the cards with respect to kernel tweaking, not a guide to GPU compute performance .... as there simply is very little to compute in a powerspectrum at all.

The goals at this time involve isolating effective strategies at shovelling data in and out of the GPU, rather than what's going on inside.... That comes later with some more meaty (compute intensive) kernels.

Jason

Jason G · « **Reply #39 on:** 19 Nov 2010, 01:51:11 pm »

Quote from: Miep on 19 Nov 2010, 01:36:13 pm

Looks like 256 gets best performance out of fermis with no or only little loss for smaller cards.

Yes it's looking not bad. I can readily embed a couple of codepaths in now, As the drivers have their own built n dispatch ( YaY ). To me that means we probably can have our cake & eat it too, but it is just a matter of running around picking up all the crumbs & sticking them together first.

Ghost0210 · « **Reply #40 on:** 19 Nov 2010, 01:54:14 pm »

And on the 465:

Device: GeForce GTX 465, 1215 MHz clock, 994 MB memory.
Compute capability 2.0
Compiled with CUDA 3020.
Stock GetPowerSpectrum():
64 threads: 16.0 GFlops 6.4 GB/s 0.0ulps

GetPowerSpectrum() mod 1: (made Fermi & Pre-Fermi match in accuracy.)
32 threads: 9.8 GFlops 3.9 GB/s 121.7ulps
64 threads: 15.8 GFlops 6.3 GB/s 121.7ulps
128 threads: 20.8 GFlops 8.3 GB/s 121.7ulps
256 threads: 23.1 GFlops 9.2 GB/s 121.7ulps

GetPowerSpectrum() mod 2 (fixed, but slow):
32 threads: 10.8 GFlops 4.3 GB/s 0.0ulps
64 threads: 13.2 GFlops 5.3 GB/s 0.0ulps
128 threads: 13.3 GFlops 5.3 GB/s 0.0ulps
256 threads: 12.1 GFlops 4.9 GB/s 0.0ulps

GetPowerSpectrum() mod 3: (As with mod1, +threads & split loads)
32 threads: 9.4 GFlops 3.7 GB/s 121.7ulps
64 threads: 15.3 GFlops 6.1 GB/s 121.7ulps
128 threads: 20.8 GFlops 8.3 GB/s 121.7ulps
256 threads: 20.6 GFlops 8.3 GB/s 121.7ulps
512 threads: 20.6 GFlops 8.2 GB/s 121.7ulps
1024 threads: 18.6 GFlops 7.4 GB/s 121.7ulps

Jason G · « **Reply #41 on:** 19 Nov 2010, 02:08:43 pm »

Cheers,
Will have to test the kernel concurrency next ( launch 2 - 16 powerspectrums at the same time ). No idea how much, if any, overall speed improvement might be achievable with that, but needs testing. I'll keep stock & all 3 mods in play for that, since one may 'pack' better than the others (smaller thread counts might pass the larger ones in performance if executing multiple on the same multiprocessor).

M_M · « **Reply #42 on:** 19 Nov 2010, 02:09:58 pm »

@Ghost: Didn't you post about 50% higher results for GTX465 results yesterday? Why's the difference? Did you change something? Drivers?

Or are there 2 different versons of PowerSpectrum floating around?

Jason G · « **Reply #43 on:** 19 Nov 2010, 02:11:28 pm »

Quote from: M_M on 19 Nov 2010, 02:09:58 pm

Or are there 2 different versons of PowerSpectrum floating around?

Check the first post, for the updated build & notes. The Mod2 kernel was doing suspect things, so I've knobbled it (for now).

[I see you used the newer build yourself, so yes, mod2 numbers will be lower than yesterday ]

SciManStev · « **Reply #44 on:** 19 Nov 2010, 04:44:41 pm »

Device: GeForce GTX 480, 810 MHz clock, 1503 MB memory
Compute capability 2.0
Compiled with CUDA 3020
Stock GetPowerSpectrum<>:
63 threads: 27.7 GFlops 11.1 GB/s 0.0ulps

GetPowerSpectrum<> mod 1: <made Fermi & Pre-Fermi match in accuracy.>
32 threads: 17.4 GFlops 7.0 GB/s 121.7ulps
64 threads: 27.5 GFlops 11.0 GB/s 121.7ulps
128 threads: 36.4 GFlops 14.5 GB/s 121.7ulps
256 threads: 39.6 GFlops 15.8 GB/s 121.7ulps

GetPowerSpectrum<> mod 2 <fixed, but slow>:
32 threads: 18.9 GFlops 7.6 GB/s 0.0ulps
64 threads: 23.1 GFlops 9.2 GB/s 0.0ulps
128 threads: 24.1 GFlops 9.6 GB/s 0.0ulps
256 threads: 22.7 GFlops 9.1 GB/s 0.0ulps

GetPowerSpectrum<> mod 3: <As with mod1, +threads & split loads>
32 threads: 16.7 GFlpos 6.7 GB/s 121.7ulps
64 threads: 26.9 GFlops 10.8 GB/s 121.7ulps
128 threads: 36.0 GFlops 14.4 GB/s 121.7ulps
256 threads: 34.9 GFlops 13.9 GB/s 121.7ulps
512 threads: 34.7 GFlops 13.9 GB/s 121.7ulps
1024 threads: 33.5 GFlops 13.4 GB/s 121.7ulps

Steve

Author Topic: [Split] PowerSpectrum Unit Test (Read 164816 times)

Jason G

Re: [Split] PowerSpectrum Unit Test

glennaxl

Re: [Split] PowerSpectrum Unit Test

M_M

Re: [Split] PowerSpectrum Unit Test

Miep

Re: [Split] PowerSpectrum Unit Test

Jason G

Re: [Split] PowerSpectrum Unit Test

Claggy

Re: [Split] PowerSpectrum Unit Test

M_M

Re: [Split] PowerSpectrum Unit Test

Miep

Re: [Split] PowerSpectrum Unit Test

Jason G

Re: [Split] PowerSpectrum Unit Test

Jason G

Re: [Split] PowerSpectrum Unit Test

Ghost0210

Re: [Split] PowerSpectrum Unit Test

Jason G

Re: [Split] PowerSpectrum Unit Test

M_M

Re: [Split] PowerSpectrum Unit Test

Jason G

Re: [Split] PowerSpectrum Unit Test

SciManStev

Re: [Split] PowerSpectrum Unit Test