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On the Farm (Feb 03 2010)
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Author | Message |
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Matt Lebofsky Send message Joined: 1 Mar 99 Posts: 1444 Credit: 957,058 RAC: 0 |
Nothing major to report, hence the lack of updates. We had our usual weekly outage yesterday for mysql maintenance. During that threw a newly compiled transitioner and scheduler into beta containing various bug fixes. The recovery was fine, though it's hard to tell as the network graphs (which are hosted by central campus, not us) seem to be broken at the moment. We're actually having server closet temperature issues again as well. So I spent a chunk of time going around to various servers and implementing "sensors" to get more temperature data - want to make sure we're not being misled by a single server with a broken fan or something. Should have done this a while ago, but I can say that about pretty much everything I'm working on. The science database is having a bit of a headache, mostly due to some extra Astropulse related analysis queries above and beyond the usual set of splitters/assimilators hitting the thing. We had to give it a kick an hour ago, and it recovered just fine (mostly since that kick killed the analysis query hogging all the i/o). We really need to improve this part of our server farm - when the NTPCkr is fully operational the science database is going to need all the juice it can get! - Matt -- BOINC/SETI@home network/web/science/development person -- "Any idiot can have a good idea. What is hard is to do it." - Jeanne-Claude |
Claggy Send message Joined: 5 Jul 99 Posts: 4654 Credit: 47,537,079 RAC: 4 |
Thanks for the update Matt. Claggy |
ront Send message Joined: 25 Aug 01 Posts: 77 Credit: 386,336 RAC: 0 |
Thanks Matt Question - Are the "astropulse" generally available to us yet? Would love to get some. Thanks! ront |
W-K 666 Send message Joined: 18 May 99 Posts: 19370 Credit: 40,757,560 RAC: 67 |
Thanks Matt They are available but only in the ratio of about, Enhanced Multibeam 40:1 Astropulse 505. Therefore at any one time the download server only has a max of three AP tasks available. This means most of the heavy hitters have only seen a few, if any, since AP was switched back on last week. |
ront Send message Joined: 25 Aug 01 Posts: 77 Credit: 386,336 RAC: 0 |
Thanks for your response. Will this improve in the forseeable future? ront |
W-K 666 Send message Joined: 18 May 99 Posts: 19370 Credit: 40,757,560 RAC: 67 |
Thanks for your response. If and when the bandwidth of Berkeley's connection is increased, then it may be. But at the moment trying to get more 8MByte downloads to us just cloggs up the connection and we all suffer. |
John McLeod VII Send message Joined: 15 Jul 99 Posts: 24806 Credit: 790,712 RAC: 0 |
Thanks for your response. If I recall, they are produced in a ratio of about 40:1 from the same tape. BOINC WIKI |
1mp0£173 Send message Joined: 3 Apr 99 Posts: 8423 Credit: 356,897 RAC: 0 |
Thanks for your response. My understanding matches JM7's. Multibeam is a narrowband search, and therefore slices nicely into nice small work units. Astropulse is a broadband search, so the work units have to have a lot more data in them -- but once you search one, you've covered that whole slice of recorded time. That's why there is a 40:1 ratio. |
W-K 666 Send message Joined: 18 May 99 Posts: 19370 Credit: 40,757,560 RAC: 67 |
Thanks for your response. What did I say in post 968033? |
John McLeod VII Send message Joined: 15 Jul 99 Posts: 24806 Credit: 790,712 RAC: 0 |
Thanks for your response. You did not say why the ratio was there. You did say that they were given out in that ratio though. BOINC WIKI |
1mp0£173 Send message Joined: 3 Apr 99 Posts: 8423 Credit: 356,897 RAC: 0 |
Thanks for your response. What John said. The fact that we don't get as much Astropulse as some would like is well established. The idea that there is an "organic" reason (that it isn't really possible to make more) is important too. Edit: it's also interesting that people talk about the science on one hand, and then complain about things like "not enough AP" which is a direct result of the science itself. |
W-K 666 Send message Joined: 18 May 99 Posts: 19370 Credit: 40,757,560 RAC: 67 |
I was under the impression that if the bandwidth was greater, that old data that has been processed with the enhanced MB app already, could be resurrected and put through the AP splitter using the s/ware filter. Including the data we have recently used when AP was switched off. And in that case the organic reason of the 8 MByte and 350 KByte sizes would not apply. |
1mp0£173 Send message Joined: 3 Apr 99 Posts: 8423 Credit: 356,897 RAC: 0 |
I was under the impression that if the bandwidth was greater, that old data that has been processed with the enhanced MB app already, could be resurrected and put through the AP splitter using the s/ware filter. Including the data we have recently used when AP was switched off. ... and it's been my understanding that without the radar blanking signal the older data wasn't that useful. But hey, we're all out here in the peanut gallery. We'll all see what happens, won't we. :-) |
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