FEED ME MORE - FEED ME MORE!

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Profile Cliff Harding
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Message 1548702 - Posted: 28 Jul 2014, 0:01:03 UTC

If this old man's mind has not gone completely senile, the servers have been feeding my 2 hungry GTX750Ti FTW GPUs with a steady diet of AP WUs since we came back up from the weekly maintenance period on Tuesday. That's going on 5+ days now and I'm certainly not complaining and I hope I don't put a jinx on it. The question is - Do any of you old heads out there in the Setiverse remember the longest we've been served such a rich diet?


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Message 1548834 - Posted: 28 Jul 2014, 7:25:21 UTC

In the past I seem to recall AP work being much more common. With the few AP only crunchers only mentioning running out of work every few months.

- With the introduction of v7 of MB a large difference in credit between MB & AP lead more people to run AP only.
- We now have a Nvidia AP app. So the crunchers that have beefy GPU systems can tear though the AP work faster than ever.
- With people favoring AP work over MB the MB tasks are not getting burned through as quickly as they otherwise would.

- Moving to the colo may also play a part in things. As they move the data for splitting to the servers and back over the network. I'm not sure if that is how it was done before or if they were just plugging drives into the system to dump the data.
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Message 1548859 - Posted: 28 Jul 2014, 8:23:27 UTC - in response to Message 1548702.  
Last modified: 28 Jul 2014, 8:24:04 UTC

The more tapes they put in one go, the longer they will last, but then the longer will be the starvation period for APs.

The best, which depends on each computer crunching capabilities, would be that they put as many tapes so that with 200 WUs in cache you can survive the period during which the AP splitters are disabled while MB Wus are still being split.

The more powerful your PC is, the lower number of tapes you would wish to be loaded at any one time if you want to have a continuos supply of AP WUs.

Paradoxically, this present bonanza can mean a long starvation when the AP splitters will stop for medium to high capacity crunchers.

Which may not be in line with your happyness.

Though things are actually generally going much better (I would say very well) since colo transfer.

All the best,
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Profile Cliff Harding
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Message 1548975 - Posted: 28 Jul 2014, 14:28:08 UTC

Paradoxically, this present bonanza can mean a long starvation when the AP splitters will stop for medium to high capacity crunchers.

 Which may not be in line with your happyness.

 Though things are actually generally going much better (I would say very well) since colo transfer.


Yeah, there is that dreadful drought that keeps popping up, but with the addition of my new toy, it make those periods more bearable.


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Message 1549128 - Posted: 28 Jul 2014, 18:47:51 UTC

APs are not being split and it looks like it will be a long time before they start up again.
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Message 1549158 - Posted: 28 Jul 2014, 19:55:51 UTC

APs being much more available in the past was also do to the feeder proportions, as well. Used to be 97 MBs and 3 APs in every load of 100 tasks for the feeder. So that limited the number of APs that were available to the scheduler every 2 (?) seconds to being 3. So.. 10,000 APs in RTS queue would last a while. Now it's just kind of a free-for-all and they go fast.

Plus all of the advancements in processing speed doesn't help, either.

I still think if we cut the number of AP splitters down to one or two instead of 6, AP splitting would slow down closer to the speed of MB splitting and then we wouldn't end up with these huge backlogs of waiting for MB to catch up...but I guess the staff doesn't see a problem with the way things are and it seems to work fine..it just kind of annoys some of us crunchers, but it makes no difference to the science. *shrug*
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Message 1549180 - Posted: 28 Jul 2014, 20:29:56 UTC

Bah! You jinxed us....

:)


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Message 1549263 - Posted: 29 Jul 2014, 2:06:53 UTC

APs are gone now we have to live on resends or something else for a real long time.
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Message 1549266 - Posted: 29 Jul 2014, 2:19:48 UTC

Dag nab it just as 1 machine starts to show a real remaning time we run out of AP's grrr

FEED US MORE ......HUNGRY .......HUNGRY.......HUNGRY
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Message 1549276 - Posted: 29 Jul 2014, 2:46:49 UTC

You can have more AP when you finish with all of your MB!
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Message 1549280 - Posted: 29 Jul 2014, 2:55:29 UTC - in response to Message 1549276.  

ops ! i'll have to hide me puters next time forgot everyone can see ....:):)
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Message 1550270 - Posted: 31 Jul 2014, 1:09:53 UTC - in response to Message 1549158.  

I still think if we cut the number of AP splitters down to one or two instead of 6, AP splitting would slow down closer to the speed of MB splitting and then we wouldn't end up with these huge backlogs of waiting for MB to catch up...but I guess the staff doesn't see a problem with the way things are and it seems to work fine..it just kind of annoys some of us crunchers, but it makes no difference to the science. *shrug*


At the moment there are only 5 of the 7 MB splitters working with the other 2 being disabled and they have been for some time now. It would improve things some what if/when they were put back online.


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Message 1550282 - Posted: 31 Jul 2014, 1:59:12 UTC - in response to Message 1550270.  

I still think if we cut the number of AP splitters down to one or two instead of 6, AP splitting would slow down closer to the speed of MB splitting and then we wouldn't end up with these huge backlogs of waiting for MB to catch up...but I guess the staff doesn't see a problem with the way things are and it seems to work fine..it just kind of annoys some of us crunchers, but it makes no difference to the science. *shrug*


At the moment there are only 5 of the 7 MB splitters working with the other 2 being disabled and they have been for some time now. It would improve things some what if/when they were put back online.

The 5 MB splitter are generally more than fast enough to keep up with demand. They actually cycle off every so often as the amount of work RTS is large enough. If there is an error it takes a bit of time to catch up.
Some time ago, shortly after moving to the CoLo IIRC, it was mentioned that they limit the speed/amount of the splitters because they were hitting a disk i/o limit with the storage array.
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Message 1550431 - Posted: 31 Jul 2014, 11:33:06 UTC - in response to Message 1549158.  


I still think if we cut the number of AP splitters down to one or two instead of 6, AP splitting would slow down closer to the speed of MB splitting and then we wouldn't end up with these huge backlogs of waiting


Though I would find it some kind of elegant solution, I fear that many would start complaining about difficulties in downloading AP WUs, which would be generalised and source for headaches for the staff to manage.
The way it is done now is a nuisance for those few of us going 100% AP and consistently checking the systems. We know what is happening, we may not like it entirely and complain once in a while, but that's it and everything goes on smoothly.
In other words, this is a nuisance for few informed people.
The way you suggest may end in problems to many more less informed people who would find themselves in unexpected problems.

Therefore, I think the present solution is wiser.

Though I always look with terror when I see 600 channels loaded at the same time! :-) ;-)

My 2 cents.

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Message 1550450 - Posted: 31 Jul 2014, 12:25:12 UTC
Last modified: 31 Jul 2014, 12:36:30 UTC

The simple answer to eliminate this problem is fix creditscrew. Then MB & AP work will "pay" the same number of "meaningless" credits and then, only then, the work balance MB vs AP will be restored since will make no diference to do any of both works.

Actualy there are few who is working hard to try to do, you could follow them at albert@home.
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Message 1550565 - Posted: 31 Jul 2014, 17:35:55 UTC - in response to Message 1550450.  

Dear Juan,
I know from what has been written here what is being tested and tried to fix the credit madness. And my best wishes goes to them.
This would obviously be the best and final thing. Granted.

What I was discussing (and I think also the others) is what to do and what may be best in the meantime. Meantime that I fear will be rather long.

Cheers!
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Message 1550568 - Posted: 31 Jul 2014, 17:40:28 UTC
Last modified: 31 Jul 2014, 17:41:16 UTC

The kitties have no complaints....
They feast on AP when it is available and then dutifully crunch away at the MB cache to help the servers towards the next batch of AP.

It would be nice if the credits were normalized between the two types of work though.
"Freedom is just Chaos, with better lighting." Alan Dean Foster

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Message 1550615 - Posted: 31 Jul 2014, 19:00:13 UTC - in response to Message 1550568.  

The kitties have no complaints....
They feast on AP when it is available and then dutifully crunch away at the MB cache to help the servers towards the next batch of AP.

It would be nice if the credits were normalized between the two types of work though.

AstroPulse v7 will probably do that. It is current being tested on Beta.
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Message 1550784 - Posted: 1 Aug 2014, 4:43:55 UTC - in response to Message 1550615.  

The kitties have no complaints....
They feast on AP when it is available and then dutifully crunch away at the MB cache to help the servers towards the next batch of AP.

It would be nice if the credits were normalized between the two types of work though.

AstroPulse v7 will probably do that. It is current being tested on Beta.


Most likely the wrong direction though.

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Message 1550803 - Posted: 1 Aug 2014, 5:43:32 UTC - in response to Message 1550784.  

The kitties have no complaints....
They feast on AP when it is available and then dutifully crunch away at the MB cache to help the servers towards the next batch of AP.

It would be nice if the credits were normalized between the two types of work though.

AstroPulse v7 will probably do that. It is current being tested on Beta.


Most likely the wrong direction though.

That's the way I took it too.
"Freedom is just Chaos, with better lighting." Alan Dean Foster

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