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Profile [B^S] madmac
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Message 888327 - Posted: 25 Apr 2009, 20:22:26 UTC

Are we getting longer (timewise) MBs or is it because of the different ranges again. I can normal do a MB in 105 minutes however some are taking around 170 minutes. It seems to be one in every four for me.Can someone explain please.
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Message 888332 - Posted: 25 Apr 2009, 20:34:29 UTC - in response to Message 888327.

It all depends on the Angle Range.

F.
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Message 888334 - Posted: 25 Apr 2009, 20:36:37 UTC

I believe crunch time depends on the angle range, which determines the number of flops, which determines the claimed credit. A 'typical' MB WU has an AR of ~0.445. Some are slightly higher, some are slightly lower, but 0.445 used to be approximately 45 credits, but it appears that has skewed down to around 38 recently.
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Message 888341 - Posted: 25 Apr 2009, 21:27:00 UTC
Last modified: 25 Apr 2009, 21:27:27 UTC

There's a very large batch of VLARs crawling through at the moment.

Especially long/slow/bad for us CUDA crunchers :-(

Happy crunchin',
Martin
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Message 888347 - Posted: 25 Apr 2009, 21:53:57 UTC - in response to Message 888341.

There's a very large batch of VLARs crawling through at the moment.

Especially long/slow/bad for us CUDA crunchers :-(

Happy crunchin',
Martin

And they keep on coming, Eek!
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Message 888349 - Posted: 25 Apr 2009, 21:57:28 UTC - in response to Message 888327.

Are we getting longer (timewise) MBs or is it because of the different ranges again. I can normal do a MB in 105 minutes however some are taking around 170 minutes. It seems to be one in every four for me.Can someone explain please.

Here's a graph of execution time vs. angle range for a sample of CPU hosts,



The shape of the red line is the approximation now being used for initial estimates of how long work will take. As you can see, it is only a rough estimate, but usable for work fetch calculations. The image is from the Estimates and Deadlines Revisited thread, which has more discussion.
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Message 888384 - Posted: 26 Apr 2009, 1:50:34 UTC

The longer units take more time, but you get more credits for them.

Instead of the normal 38, you might get 50 to 80. So unless they are snarling up your CUDA rig then they aren't a problem.

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Message 888387 - Posted: 26 Apr 2009, 1:58:30 UTC - in response to Message 888384.

The longer units take more time, but you get more credits for them.

Instead of the normal 38, you might get 50 to 80. So unless they are snarling up your CUDA rig then they aren't a problem.

Ian

Yeah, their just unexpected, But not unwanted, At least to Me. My Cache was at 41 days earlier today, Now It's at just over 30 days. Inflation has come to Seti.
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Message 888388 - Posted: 26 Apr 2009, 2:16:36 UTC

Been getting almost nothing but VLAR's for 3 days now, and the ones from the 26Dec08 series are particularly nasty and prone to hanging.

It's all those VLAR units that have been previously bounced by CUDA users being re-sent because they're clogging up the system. It's the law of "Swings and Roundabouts". *Someone* has to eat all the black jelly beans that have been left behind in the jar :-)

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Message 888394 - Posted: 26 Apr 2009, 3:21:39 UTC - in response to Message 888388.
Last modified: 26 Apr 2009, 3:28:24 UTC

Been getting almost nothing but VLAR's for 3 days now, and the ones from the 26Dec08 series are particularly nasty and prone to hanging.

It's all those VLAR units that have been previously bounced by CUDA users being re-sent because they're clogging up the system. It's the law of "Swings and Roundabouts". *Someone* has to eat all the black jelly beans that have been left behind in the jar :-)

Brodo

I like almost any flavor but Black Jelly Beans and Black Licorice I abhor the most, The rest are fine, My Nephew likes Black Licorice and I like Red Vine Licorice(Which He detests, go figure).

Oh and some of the VLARs do hang and I've been getting a lot that actually work, But wow, cpu or not they take a long, Long time to do.

Oh and the cache is now down to 20 days, This is too weird.
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Message 888402 - Posted: 26 Apr 2009, 4:02:21 UTC

I run CUDA with VLARkill like most people here. Of course there are always fear that those VLAR units will go round and round until they get killed for having errored out too many times. Right now, looking at the wingmen my MBs validate against, chances of a CUDA-CUDA pairing seems to be around 10% (anyone got a better statistics?)

If a unit has about 5 resends for validation, chances of being rejected due to CUDA-CUDA pairing for everytime it gets resend is approx 1 in a million (2 initial replications + 5 resends, could have 1 CPU there and if the other 6 are CUDA vlarkills then it will die). (i'm not expert in how it works, this is the impression in my mind, plesae kindly correct if its wrong.. Of course this assumes that all CUDA clients are vkill ones

Hopefully the rebranding script becomes easy enough to run (or integrated into the opt app) before CUDA-CUDA pairings becomes higher
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Message 888407 - Posted: 26 Apr 2009, 5:23:33 UTC - in response to Message 888402.

yeah i notice mine going up to 31 hours on 2 of them and i am running a extreme oc 9800gtx+

but what really gets me are my is the wingmen's that slow it down.

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Message 888408 - Posted: 26 Apr 2009, 5:34:03 UTC - in response to Message 888394.
Last modified: 26 Apr 2009, 5:53:49 UTC

Been getting almost nothing but VLAR's for 3 days now, and the ones from the 26Dec08 series are particularly nasty and prone to hanging.

As of 26 Apr 2009 5:20:09 UTC 26Dec08 has done 10 channels so it has 4 channels left to go. I've had nothing but AP units for the last 8 days my pending credit is 19,973.40, i have all aps selected to get work from. all my pending credit is from 16 ap units. My RAC is only 98.29. Should it be higher than that with a pending credit of 19,973.40? Thank's in advance.
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Message 888410 - Posted: 26 Apr 2009, 6:09:47 UTC

For the moment the cache is down to a little over 12 days and the times are more like normal. Oh well, It could be worse I guess the PC could get the swine flu. ;)
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Message 888413 - Posted: 26 Apr 2009, 6:20:57 UTC - in response to Message 888410.

For the moment the cache is down to a little over 12 days and the times are more like normal. Oh well, It could be worse I guess the PC could get the swine flu. ;)

You are so right regarding Swine flu & thank's for info
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Message 888415 - Posted: 26 Apr 2009, 6:29:45 UTC - in response to Message 888413.
Last modified: 26 Apr 2009, 6:30:44 UTC

For the moment the cache is down to a little over 12 days and the times are more like normal. Oh well, It could be worse I guess the PC could get the swine flu. ;)

You are so right regarding Swine flu & thanks for info

No problem, I last heard of the swine flu was back in 1976. Oh and a PC can't get the swine flu as It isn't biological, Humans are, PCs aren't.

As to WU's I'm having a WU(cuda) just sit there twiddling It's proverbial thumbs from time to time, most of the time suspending the WU and unsuspending the WU starts It back up, Although sometimes I have to shut down Boinc 6.6.20 and restart Boinc to unfreeze the WU, weird indeed.
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Message 888726 - Posted: 27 Apr 2009, 8:43:14 UTC - in response to Message 888408.
Last modified: 27 Apr 2009, 8:44:20 UTC

Been getting almost nothing but VLAR's for 3 days now, and the ones from the 26Dec08 series are particularly nasty and prone to hanging.

Tape 26dec08 has finished. I'd be interested to know the next tape that contains VLAR'S work units is. At present I'm getting all ap units. This has shot my pending credit to 25,012.85. I like how my pending credit is growing, I wish my RAC would start to climb it's been at 98.29 for over two days. I'm sure it will start to increase.
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Message 890296 - Posted: 1 May 2009, 21:59:56 UTC

Looking at the Arecibo observing schedule for December, it looks as if all those VLARs came from P2030: An ALFA Pulsar Survey of the Galactic Plane. Surveys usually give higher ARs, but it looks like they finished the first scan in 2005 and they're now studying individual locations in more detail.

P2030 is managed by Cornell University, and there's a new Cornell publication Arecibo pulsar survey is using 50,000 PCs worldwide to generate supercomputing power linked from the BOINC home page. It's a BOINC project, but under the wing of Einstein@Home, not us.

So we have an interesting BOINC dilemma. Einstein's new ABP1 application relies on precisely the same data that drags SETI/CUDA to its knees. What's a cruncher to do?

Starting today, P2030 is getting five more observing slots on consecutive days (01 May - 05 May). I hope Eric can come up with some way of alleviating the CUDA VLAR problem before those tapes hit the splitters.

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Message 890304 - Posted: 1 May 2009, 22:25:29 UTC - in response to Message 890296.
Last modified: 1 May 2009, 22:40:21 UTC

Hi, last time I mainly crunch , AP units, on the 3 QUADs that is.
On my 'old'P4 Dual (2.8GHz), I get MB's. I've taken my LT, out.
.I let it crunch for more then a year, with optimized MB SSE3 applications, once recued by my insurance {:)}.

I do constantly need it for other, quite demanding programs and a LINUX setup.

I get more AP then MB WU's now a day, I'm pleased with them.
2 a day, per core on the fastest QUAD and 3 per 2 day's on the Q6600's.
And, they do are part of the sky survey just like the Multi Beam (Narrow Band;1.42x.xxx.xxx Hz.)!

That means more AR (0.2-0.5) or VLAR?
Still aproblem for CUDA?

Keep On Crunching
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Message 890338 - Posted: 1 May 2009, 23:40:22 UTC - in response to Message 890296.


Starting today, P2030 is getting five more observing slots on consecutive days (01 May - 05 May). I hope Eric can come up with some way of alleviating the CUDA VLAR problem before those tapes hit the splitters.

Fred J, out of interest where did you see that they are allowing five more observing slots for P2030 on consecutive days (01 May - 05 May)? Thanks in advance. If the tapes hit the splitters before the 10th Anniversary I doubt that it will get looked at because all focus is been into nitpicker
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