High disk activity running Gamma on GPU (but only one of them)?!
6 May 2020 18:51:01 UTC
Topic 222364
(moderation:
On one computer, I have a 4GB AMD Radeon RX 560 GPU running 2 gamma tasks simultaneously. I noticed the disk light flashing a lot, so I checked the Windows 10 task manager. The two gamma tasks are writing 1MB/second between them to the system drive.
On another computer, I have three 3GB AMD Radeon R9 280X GPUs running 2 gamma tasks each simultaneously. These are only writing 0.2MB/second per card, a fifth of the amount, on cards that do that tasks 2.5 times quicker.
So that's the equivalent of 12.5 times more disk activity than I would expect on the slower card.
It's not enough disk activity to cause a problem, as it's an SSD, I was just wondering why it's doing it.
If this page takes an hour to load, reduce posts per page to 20 in your settings, then the tinpot 486 Einstein uses can handle it.
Still doing it, but only now
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Still doing it, but only now and then. Once it starts doing it, it does it with every Gamma task until a reboot. Any ideas?
If this page takes an hour to load, reduce posts per page to 20 in your settings, then the tinpot 486 Einstein uses can handle it.
Hypothesis : one possible
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Hypothesis : one possible deduction is that the gamma tasks are not equivalent b/w the slower and the faster cards ie. they systematically differ in say, ( astronomical ) source template frequency. It's generally true that higher source frequencies require more templates to be tested per given frequency interval. Ergo more disk accesses to write out results/candidates? You could test this by examining the task names via Boinc Manager, as the naming scheme generally include/imply a source template frequency.
Cheers, Mike.
I have made this letter longer than usual because I lack the time to make it shorter ...
... and my other CPU is a Ryzen 5950X :-) Blaise Pascal
Mike Hewson
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Does b/w mean "between"?
It's not doing the high disk access just now, but the list of Gammas on my machines have a similar range of frequencies on the one with the slow card and the ones with the faster cards. If the 8 digit number is the frequency, they all range from about 24260000 to 35740000. The start of the task name is always LATeah1063L44_444.0_0_0.0_ on all machines.
I'll assume that my slow card gets higher frequency ones occasionally. Admittedly it's the only machine I'd be likely to spot high disk access on. The others I only look at when I need to.
If this page takes an hour to load, reduce posts per page to 20 in your settings, then the tinpot 486 Einstein uses can handle it.