low RAC with RX 570 card?

melk
melk
Joined: 26 May 17
Posts: 16
Credit: 211,483,682
RAC: 102,245
Topic 226724

Hi all, I have a RX 570 card that turns in very low RAC (1,652) compared to even a 1050 Ti (56,625)

Does this seem right? different hosts but similar CPU and OS

 

Gravitational Wave search O3 All-Sky #1 v1.01 () windows_x86_64 tasks

mikey
mikey
Joined: 22 Jan 05
Posts: 8,432
Credit: 642,331,200
RAC: 135,032

melk wrote:Hi all, I have a

melk wrote:

Hi all, I have a RX 570 card that turns in very low RAC (1,652) compared to even a 1050 Ti (56,625)

Does this seem right? different hosts but similar CPU and OS

 

Gravitational Wave search O3 All-Sky #1 v1.01 () windows_x86_64 tasks

 

A 570 has 5095 fp32gflops  318 fp64gflops and most importantly the FP64 = 1/16 FP32 ratio

 

while the 1050Ti has 2138 fp32gflops 66 fp64 gflops and again most importantly a FP64 = 1/32 FP32 ratio

 

data from here: https://www.geeks3d.com/20140305/amd-radeon-and-nvidia-geforce-fp32-fp64-gflops-table-computing/

Gary Roberts
Gary Roberts
Moderator
Joined: 9 Feb 05
Posts: 5,542
Credit: 76,585,828,764
RAC: 65,050,966

melk wrote:Does this seem

melk wrote:
Does this seem right?

No, something is drastically wrong with the hardware/software setup for that machine.

Tasks are taking something like 20 times longer than they should.  The funny thing is that tasks are validating so that sort of hints at some incredibly low core speed for the GPU or some sort of GPU throttling or over-committing.

Have you checked for heat issues?  Are the GPU's fans running correctly?  Are you running something compute heavy on all the available CPU threads?  Your tasks list shows only GW GPU tasks.  Maybe you're running other projects?  Are you running multiple concurrent GPU tasks?  Have you updated hardware or software on that machine recently?

Unfortunately, something is wrong with your setup and you'll just have to find what it is.  If it was a task problem, they wouldn't be validating.

Cheers,
Gary.

cecht
cecht
Joined: 7 Mar 18
Posts: 1,024
Credit: 1,464,760,869
RAC: 1,531,171

Gary Roberts wrote:...Tasks

Gary Roberts wrote:
...Tasks are taking something like 20 times longer than they should.  ...

But as of 6 Jan, Melk's tasks are completing in the expected time range, so that RAC should tick up in the coming week.  Glad to see things are running well now!  What did you change Melk?

What seems odd now though is the relatively long CPU time for each task. My RX570s run GW tasks with CPU times about 1/3 of completion times, but Melk's CPU times are closer to 3/4 of completion times. That's not a problem per se, but I can't think of why there would be a difference. 

Ideas are not fixed, nor should they be; we live in model-dependent reality.

Ian&Steve C.
Ian&Steve C.
Joined: 19 Jan 20
Posts: 1,602
Credit: 11,879,195,361
RAC: 27,615,668

cecht wrote: What seems odd

cecht wrote:

What seems odd now though is the relatively long CPU time for each task. My RX570s run GW tasks with CPU times about 1/3 of completion times, but Melk's CPU times are closer to 3/4 of completion times. That's not a problem per se, but I can't think of why there would be a difference. 

possibly due to differences in CPU speed/IPC (as GW tasks are fairly CPU bound, a slow CPU slows down overall computation) and or differences in "multiplicity", or a combination of the two, or more (other CPU loads, environmental differences, etc), factors.

_________________________________________________________________________

Tom M
Tom M
Joined: 2 Feb 06
Posts: 1,933
Credit: 3,464,316,335
RAC: 6,123,963

Based on current tasks and

Based on current tasks and processing speeds your rx 570 should top out at over 50,000 RAC.

Still a Member of the O.F.A (Old Farts Association).
The illusion of control is sustained by the randomness of "murphy's law."

 

 

melk
melk
Joined: 26 May 17
Posts: 16
Credit: 211,483,682
RAC: 102,245

Well it must have been some

Well it must have been some sort of glitchy driver issue, as I did a "clean install' of the most recent version and immediately my RAC has jumped up for that card.

Thanks all for taking a look. I wish I would have realized sooner, I've been running this box for quite a while.

I do run CPU tasks on the host as well, but generally have boinc client set to use 75% of available cpu in order to leave room for GPU overhead and such.

melk
melk
Joined: 26 May 17
Posts: 16
Credit: 211,483,682
RAC: 102,245

RAC still climbing, about to

RAC still climbing, about to crack 45k :)

That said, anyone else notice that during processing the O3AS tasks seem to stall out at 99% with no gpu load. They eventually do finish and validate but there's long chunks of time where the gpu is idle and boinc client reports the tasks at 99%. I've observed this same behavior on multiple hosts with different gpu's.

Ian&Steve C.
Ian&Steve C.
Joined: 19 Jan 20
Posts: 1,602
Credit: 11,879,195,361
RAC: 27,615,668

melk wrote: RAC still

melk wrote:

RAC still climbing, about to crack 45k :)

That said, anyone else notice that during processing the O3AS tasks seem to stall out at 99% with no gpu load. They eventually do finish and validate but there's long chunks of time where the gpu is idle and boinc client reports the tasks at 99%. I've observed this same behavior on multiple hosts with different gpu's.

yes that's normal for the gravitational wave tasks. I believe the final step is doing some CPU processing so it takes longer.

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Betreger
Betreger
Joined: 25 Feb 05
Posts: 965
Credit: 745,931,637
RAC: 278,878

You can run the GWs 2X on

You can run the GWs 2X on that card. Then stagger the start times and the GPU will always have something to do. By doing that my GTX1660s processes apx. 15 to 20% more work. 

 

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