Gravitational Wave search O1 all-sky tuning (O1AS20-100T)

rbpeake
rbpeake
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The server says there is

The server says there is work, but I am getting the following message. And I was getting work units until the new app version appeared.

  • 2/15/2016 1:55:22 PM | Einstein@Home | No work sent 2/15/2016 1:55:22 PM | Einstein@Home | No work is available for Gravitational Wave search O1 all-sky tuning
    2/15/2016 1:55:22 PM | Einstein@Home | see scheduler log messages on

https://einsteinathome.org/host_sched_logs/11674/11674479

ph2000
ph2000
Joined: 17 Mar 05
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"Why some hosts take 6h and

"Why some hosts take 6h and some 24h we don't know yet."

This may be a sign of that the memory size accessed randomly by an computational iteration (loop, subroutine, etc.) exceeds one level of the cache hierarchy on some machines, but not on other ones.
For example (since these units very rare), some or a couple of O1 units may fit in a large (8 MB or greater) L3 cache but CPUs with no L3 keeps under heavy pressure the RAM, showing a definite multiplier for run time for same computation capacity.

One of my machines is an APU (2x2 MB L2, no L3) running constantly BRP6 on iGPU with two threads; its GPU shares memory bandwidth with the CPU computation. At the last GW search turn I used to run 2 CPU threads with it, resulting 38K seconds BRP6 computation time. With current gamma-ray search (seems memory-intensive) the BRP6 run time is 15-20% longer. With running 2 O1 units it was expected to double the BRP6 run time - to 70-80K seconds - with 34 hour run time for O1s (stopped at 4% after 5K seconds).

rbpeake
rbpeake
Joined: 18 Jan 05
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RE: The server says there

Quote:

The server says there is work, but I am getting the following message. And I was getting work units until the new app version appeared.

  • 2/15/2016 1:55:22 PM | Einstein@Home | No work sent 2/15/2016 1:55:22 PM | Einstein@Home | No work is available for Gravitational Wave search O1 all-sky tuning
    2/15/2016 1:55:22 PM | Einstein@Home | see scheduler log messages on
https://einsteinathome.org/host_sched_logs/11674/11674479

Just got some! :)

AgentB
AgentB
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OK some observations based on

OK some observations based on validated tasks this host

Fastest task ~21K seconds this task is the 64 bit app

Gravitational Wave search O1 all-sky tuning v1.02 x86_64-pc-linux-gnu
Flags: LAL_NDEBUG, OPTIMIZE, HS_OPTIMIZATION, GC_SSE2_OPT, X64, SSE, SSE2, GNUC X86 GNUX86
glibc version/release: 2.19/stable


Slowest ~31K seconds this task is the 32 bit app

Gravitational Wave search O1 all-sky tuning v1.02 (SSE2) i686-pc-linux-gnu
Flags: LAL_NDEBUG, OPTIMIZE, HS_OPTIMIZATION, GC_SSE2_OPT, i386, SSE, SSE2, GNUC X86 GNUX86
glibc version/release: 2.11.1/stable

Edit: corrected some timings on slowest task
I don't know why i am getting 32 bit app, i will look again at the E@H settings.

Bernd Machenschalk
Bernd Machenschalk
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I don't think this has

I don't think this has anything to do with your settings. The Client reports both platforms, so it's up to the server to decide which work to send. For some past applications the 32Bit version was slightly faster than the 64Bit version, I guess the server configuration was just kept from there. I'll look into that tomorrow.

BM

BM

Bernd Machenschalk
Bernd Machenschalk
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This should be fixed now, if

This should be fixed now, if you can run the 64Bit version, you should get it.

BM

BM

AgentB
AgentB
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This is working fine now,

This is working fine now, thanks Bernd.

The i3-550 has picked up some 64bit as well, but time difference between the 32bit and 64bit is not so pronounced (not AVX). I'll go gpu free for a day to get a measure on timing.

Gary Roberts
Gary Roberts
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I just allowed a Haswell

I just allowed a Haswell based machine to join the test. It runs Linux x86_64 and I notice there are two apps listed on the app page - 1.03 (X64) and 1.03 (AVX).

Since AVX has been in Intel processors since Sandy Bridge (I believe - could be wrong) shouldn't the machine have been assigned the 1.03 (AVX) app? The downloaded app was labeled x86_64-pc-linux-gnu__X64. I presume there is another version labeled __AVX?

EDIT: Maybe no Linux hosts are getting AVX. These are GW tasks on a machine rather more powerful than mine and the app listed there is X64 and not AVX.

Cheers,
Gary.

tullio
tullio
Joined: 22 Jan 05
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An AVX task crashed on my AMD

An AVX task crashed on my AMD A10-6700 running Windows 10 while two X64 are running on my Opteron 1210, dated 2007 and running SuSE Linux Leap 42.1.
Tullio

Mike Hewson
Mike Hewson
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Yup. On two machines I've had

Yup. On two machines I've had runtimes from 39K through 95K for v1.03. Quicker on the Linux box. But going well though, just awaiting quorum. These hosts do nothing except BOINC and wait for me to turn up after work ....

Cheers, Mike.

I have made this letter longer than usual because I lack the time to make it shorter. Blaise Pascal

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