QuChemPedIA@home

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Hal Bregg
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#11 Re: QuChemPedIA@home

Post by Hal Bregg »

davidBAM wrote: Wed Jan 01, 2020 3:20 pm 30 hours with no checkpointing !!!!! Sounds as bad as SRbase

I'll maybe try it on one 2990wx with HT off but, man, when I said 'difficult', I didn't realise how bdooly difficult.
SRBase has checkpoints. The progress bar doesn't reflect actual percentage of work done if you restart the task (see stderr.txt file for actual work progress).

More about checkpoints in this thread
http://srbase.my-firewall.org/sr5/forum ... =1001#4460
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#12 Re: QuChemPedIA@home

Post by davidbam »

Oh, TYVM. That would certainly help a lot
I think this is fool-proof but could you just try it for me please? • There are 10 types of people in the world; those who understand binary, and those who don’t
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#13 Re: QuChemPedIA@home

Post by Megacruncher »

I only joined this project yesterday. Mostly because I hadn't noticed it before.
It doesn't seem to be causing any problems and the credit isn't too bad. As well as getting some FB points for us I'm making it my next million credit target.
I notice an issue above about it not working well with hyperthreading. But my experience suggests that it is working okay. My Threadripper 1950X 16-Core Processor Linux machine is running 32 WU at a time without error and is more or less matching a 32 CPU instance on my Threadripper 2990WX 32-Core Processor, also Linux, machine.
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#14 Re: QuChemPedIA@home

Post by Bryan »

The problem isn't hyperthreading. The issue is it slams ALL WU onto the 1st 32 threads of a machine. If you only have 32 threads then it isn't an issue.
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#15 Re: QuChemPedIA@home

Post by Alez »

It also seems to require quite a bit of memory. Had more than a few tasks sitting with waiting for memory whilst running it.
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#16 Re: QuChemPedIA@home

Post by Megacruncher »

I just tried it on Windows. Total wipeout. 169 tasks. 169 errors. I'll stick to Linux.
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#17 Re: QuChemPedIA@home

Post by Bryan »

Linux runs native, Win runs VBox.
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#18 Re: QuChemPedIA@home

Post by Megacruncher »

Bryan wrote: Sun Jan 05, 2020 11:32 pm Win runs VBox.
I'll not bother then!
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#19 Re: QuChemPedIA@home

Post by Alez »

Same for me, Vbox has been a pointless exercise.
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#20 Re: QuChemPedIA@home

Post by davidbam »

Not a good start from me. Two WU errored, 50 were invalid after significant run times. Only 3 validated at about 8pts per thread per hour on an OC 3900X. To add insult to injury, I forgot to join the team so even they didn't count.

Is this normal? (Linux)
I think this is fool-proof but could you just try it for me please? • There are 10 types of people in the world; those who understand binary, and those who don’t
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#21 Re: QuChemPedIA@home

Post by UBT - Woodles »

The only errors I've had have been during downloading or cancelled by the server, none resulted in any time being lost.

However, I do have about a third ending up as invalid, most after 30 ish seconds but some running to the normal execution time.

Every one has invalids, it's a project "feature" :)

I'm getting about 50 credits an hour with a single thread, are you running them multithreaded?
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#22 Re: QuChemPedIA@home

Post by davidbam »

Thanks. No, not running MT. Does the last setting really mean # threads per WU ?
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I think this is fool-proof but could you just try it for me please? • There are 10 types of people in the world; those who understand binary, and those who don’t
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#23 Re: QuChemPedIA@home

Post by UBT - Woodles »

You would think so but no. I'm not sure what it's used for, I have it set to "No Limit" but tasks run on a single thread.

They have no work at the moment so I can't try different options.

The project developer has said that they've experimented and there's no advantage to using more than one core per workunit.
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#24 Re: QuChemPedIA@home

Post by davidbam »

Okay thanks. Maybe I'll try again later on a lesser machine but there is no way I am putting my thoroughbred 3900X onto something which has 50 out of 55 invalid :D
I think this is fool-proof but could you just try it for me please? • There are 10 types of people in the world; those who understand binary, and those who don’t
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#25 Re: QuChemPedIA@home

Post by UBT - Woodles »

Makes sense :lol:
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#26 Re: QuChemPedIA@home

Post by davidbam »

tried an Intel machine this time, older OS (ubuntu 18.10): 3 valid, 74 invalid

Not a good ratio, especially when some of the invalid WU have run for 20-30 mins before failing.
I think this is fool-proof but could you just try it for me please? • There are 10 types of people in the world; those who understand binary, and those who don’t
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#27 Re: QuChemPedIA@home

Post by UBT - Woodles »

I only have the one box on QuChem so can't help with different CPUs or OS.

If it helps, I've just downloaded four tasks and all ended up as invalid, three after 30 seconds, one after twenty minutes. Normally I'd get at least one valid out of four but it's a small sample size.
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#28 Re: QuChemPedIA@home

Post by davidbam »

the CPU/OS may be a red herring but, out of interest, what are you running on please and I'll see if I have anything close
I think this is fool-proof but could you just try it for me please? • There are 10 types of people in the world; those who understand binary, and those who don’t
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#29 Re: QuChemPedIA@home

Post by UBT - Woodles »

It's a 1950X, default settings with 32 Gig of RAM running Ubuntu 19.04 if I remember correctly. QuChem is down again so I can't check.

Edit: Just had a thought and checked on WUProp, details are correct (also Boinc version 7.14.2 if it matters?)
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#30 Re: QuChemPedIA@home

Post by Dirk Broer »

Any specs on the machine in question? 64-bit is pretty standard on modern machines now.
I'd even go so far as saying that QuChemPedIA only has 64-bit apps for vbox (used for Windows and MacOS), and needs at least a 64-bit CPU for the rest (=Linux).
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