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Technical News :
Working as Expected (Jul 13 2009)
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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 |
The data pipeline over the weekend seemed to be more or less okay, thanks to running out of Astropulse workunits and not having any raw data to split to create new ones. Of course, I shovelled some more raw data to the pile this morning, and our bandwidth shot right back up again. This pretty much proves that our recent headaches have been largely due to the disparity of workunit sizes/compute times between multibeam/Astropulse, but that's all academic at this point as Eric is close to implementing a configuration change which will increase the resolution of chirp rates (thus increasing analysis/sensitivity) and also slowing clients down so they don't contact our servers as often. We should be back to lower levels of traffic soon enough. We are running fairly low on data from our archives, which is a bit scary. We're burning through it rather quickly. Luckily, Andrew is down at Arecibo now, with one of our new drive bays - he'll plug it in perhaps today and we'll hopefully be collecting data later tonight...? To be clear, we actually have hundreds of raw data files in our archives, but most of them suffer from (a) lack of embedded hardware radar signals (therefore making it currently impossible to analyse without being blitzed by RFI), or (b) accidental extra coordinate precession, or (c) both of the above. Software is in the works (mostly waiting on me) to solve all the above. - 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 |
Borgholio Send message Joined: 2 Aug 99 Posts: 654 Credit: 18,623,738 RAC: 45 |
Good deal. One of the commonly suggested methods to work around the bandwidth and database issues are to increase the amount of science done with the various apps, so that clients will take longer to do them. Will changing the resolution of chirping cause any problems for GPU crunchers, or will it basically be the same thing as it is now, just slower? You will be assimilated...bunghole! |
John McLeod VII Send message Joined: 15 Jul 99 Posts: 24806 Credit: 790,712 RAC: 0 |
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zpm Send message Joined: 25 Apr 08 Posts: 284 Credit: 1,659,024 RAC: 0 |
I hope that the deadlines also increased with the increased work. for sure please. i some grab wu's for gpu and have work stacked for cpu and i end up running ggrid until like 5 days left for the deadline on seti work... sometimes. |
RandyF Send message Joined: 8 Jan 07 Posts: 15 Credit: 12,296,855 RAC: 1 |
Send me the largest WU's you got, Matt! :D |
HAL9000 Send message Joined: 11 Sep 99 Posts: 6534 Credit: 196,805,888 RAC: 57 |
Send me the largest WU's you got, Matt! :D "you have mail! 857,000 AP wu's!" lol Thanks for the update Matt! SETI@home classic workunits: 93,865 CPU time: 863,447 hours Join the [url=http://tinyurl.com/8y46zvu]BP6/VP6 User Group[ |
CryptokiD Send message Joined: 2 Dec 00 Posts: 150 Credit: 3,216,632 RAC: 0 |
any ideas how much longer the workunits will take? with how fast modern computers are coupled with the optamized apps, i would suggest making everything take 10x longer. this would go reasonably well with moores law. for a little while anyways. |
Dirk Sadowski Send message Joined: 6 Apr 07 Posts: 7105 Credit: 147,663,825 RAC: 5 |
I have a lot of results ready for UL, but the UL server is offline? Longer crunching time for MB.. I hope the credits will increase also.. ;-) The applications don't need to be adjusted? But.. BTW.. if AP overload the internet traffic to the server.. why not 'disable' AP to the time faster traffic is possible ('bigger cable')? |
Dirk Sadowski Send message Joined: 6 Apr 07 Posts: 7105 Credit: 147,663,825 RAC: 5 |
... Is this really well/better for the science or only to resolve the bandwidth prob? Isn't MB then like AP? (only difference the narrowband/broader-band) |
Dave_In_Oz Send message Joined: 26 Jul 99 Posts: 6 Credit: 12,797,191 RAC: 22 |
I am smiling as I read this thread. Over the weekend I built an i7-950 with a nvidia GTX295. For the first 24hrs I did not run any GPU CUDA work just so I could get a feel of how quick my new toy was. Having 8 threads increased my throughput significantly, but when I upgraded the graphics driver to a release that supported CUDA it all took off. I have had a dramatic increase in completing units. I participate in a number of projects, and went from about 900 to 1000 credits a day to over 5,000 today. And the new toy is stock, no over clocking at all, and temps are all very reasonable. Wow!!!! But alas I am probably contributing to the infrastructure stress - I have over 30 results waiting to upload, the majority of them were done on the i7 in the past 12 hrs. |
ML1 Send message Joined: 25 Nov 01 Posts: 21209 Credit: 7,508,002 RAC: 20 |
Indeed so... Working exactly as expected. For the link limits and congestion... Note: In a email that was sent to Seti Staff. At a point in time the 100Megabit link was Full Duplex. Meaning Uploads should not interfere with Downloads and vice versa (each is in its own channel). Regards, Martin See new freedom: Mageia Linux Take a look for yourself: Linux Format The Future is what We all make IT (GPLv3) |
Dirk Sadowski Send message Joined: 6 Apr 07 Posts: 7105 Credit: 147,663,825 RAC: 5 |
BTW. ~ 400 results in the BOINC UL overview and every few minutes increasing.. |
Sebastian M. Bobrecki Send message Joined: 7 Feb 02 Posts: 23 Credit: 38,375,443 RAC: 0 |
Hello everyone
It seams that it only need changes in <analysis_cfg> in result header. Am I right? But I'm curious, what with already computed workunits? Will they be resend to be analysed with new more sensitive settings, that sounds good to me. Or maybe only new one will be treated in that way. Hm it also sounds good to me :) |
DJStarfox Send message Joined: 23 May 01 Posts: 1066 Credit: 1,226,053 RAC: 2 |
We are running fairly low on data from our archives, which is a bit scary. We're burning through it rather quickly.... Matt, We have 3.5M tasks out in the field. Would it be such a tragedy for SETI to take a break, turn in a couple million outstanding tasks, do some software development, and setup a server or two while the project is down? You could even run the splitters for a couple days before bringing the project back online, to build-up a cache of tasks. If there's enough of a reward in terms of project accomplishment, then I see no problem with a week or two worth of PLANNED project downtime to focus on some much needed work. Many BOINC projects have planned downtime in their lifecycle for upgrades, different steps in their research, etc. There's no reason SETI needs to be different and expect 100% continuous work available. |
Richard Haselgrove Send message Joined: 4 Jul 99 Posts: 14679 Credit: 200,643,578 RAC: 874 |
Matt, Please turn uploads back on during maintenance, while we have nice clean bandwidth to use. |
# Bob Ahlers # Send message Joined: 30 Mar 01 Posts: 18 Credit: 10,209,954 RAC: 0 |
I have 10 E5420 CPU's waiting for WU's and about 50 WU's ready to be uploaded, the lists are getting realy long :-( Please activate the upload server for a couple of hours. |
PSY0NIC Send message Joined: 17 Apr 02 Posts: 1 Credit: 34,667 RAC: 0 |
I have 10 E5420 CPU's waiting for WU's and about 50 WU's ready to be uploaded, the lists are getting realy long :-( Aye... I had to suspend mine as well. 50+- uploads and stacking up fast. It's downloading plenty of replacements though. |
Pappa Send message Joined: 9 Jan 00 Posts: 2562 Credit: 12,301,681 RAC: 0 |
Reading Matts Tech News the other day and the Cricket Graphs when the Feeder was putting out Just MultiBeam... You could see that Uploads (Uploads and Scheduler Requests) were getting through and eating about 17.5% of the bandwidth. Downloads due to the feeder settings were keeping up and eating ~63% In that cirucumstance the balance was very visible. Now as Uploads have been turned Off, I presume that Matt is tunning the "Feeder" to see what settings might be better. In order to accurately set this Uploads would interfere with the calibrations Regards Please consider a Donation to the Seti Project. |
HAL9000 Send message Joined: 11 Sep 99 Posts: 6534 Credit: 196,805,888 RAC: 57 |
Reading Matts Tech News the other day and the Cricket Graphs when the Feeder was putting out Just MultiBeam... You could see that Uploads (Uploads and Scheduler Requests) were getting through and eating about 17.5% of the bandwidth. Downloads due to the feeder settings were keeping up and eating ~63% That makes good sense. Let's hope they get it all tuned before there are so many work units out trying to be returned that it just clogs the uploads for days. SETI@home classic workunits: 93,865 CPU time: 863,447 hours Join the [url=http://tinyurl.com/8y46zvu]BP6/VP6 User Group[ |
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