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Send message Joined: 12 Jul 11 Posts: 857 Credit: 1,619,050 RAC: 0 |
My colleague has cleaned database and I think that is the end of http errors etc etc. I have submitted new work and I am always getting results anyway. There is still a whole bag of worms around sse2 sse3 ssse3 pni and whatever, not helped by Intel's ifort refusal to run optimised code on non-Intel hardware. Igor has much improved version distribution and some people are getting "PNI" versions. The important thing is that SSE2 upwards is much faster than the generic version. Don't want to waste resources. All versions are completely numerically portable (I hope so) but when panic is over I shall be looking at all rejected results as I believe they are due to hardware failures (over-clocked?). If all goes well I shall try and issue an update to whatever happened to lhc@home this weekend. In the meantime someone has changed the WWW pages, or whatever and I don't even know if you can read this. All my bookmarks failed and usual start page NOT available. Eric (from his new super MAC notebook pro, bought at great personal expense, but have never had the time to set up. I am going to try and install BOINC now.) |
Send message Joined: 12 Sep 11 Posts: 38 Credit: 218,154 RAC: 0 |
I think I am back to normal now. Happily crunching 4 tasks at the moment. It's just been a heck of a week for everybody! I never had any doubt that the problems would get resolved, and I don't worry about loss of credit because it's all for science anyway. And such great science it is. I'm with this project all the way. |
Send message Joined: 4 May 07 Posts: 250 Credit: 826,541 RAC: 0 |
Still not getting new Rasks. I suspended the other Projects I am running and did an Update (twice). Received no Tasks in spite of the fact that Server Status shows 5,000+ available. Here's the log showing where I suspended the other Projects and then "pumped" LHC ... 7/11/2012 11:27:39 | Einstein@Home | project suspended by user |
Send message Joined: 9 Aug 11 Posts: 3 Credit: 49,644 RAC: 0 |
Same thing here, many tasks available but boinc says none available: wo 11 jul 20:42:18 2012 | LHC@home 1.0 | update requested by user wo 11 jul 20:42:21 2012 | LHC@home 1.0 | Sending scheduler request: Requested by user. wo 11 jul 20:42:21 2012 | LHC@home 1.0 | Requesting new tasks for CPU wo 11 jul 20:42:27 2012 | LHC@home 1.0 | Scheduler request completed: got 0 new tasks wo 11 jul 20:42:27 2012 | LHC@home 1.0 | No tasks sent Running on one of the brand new shiny MacBook Pro's (Retina) as well, i see there are no SSE2/SSE3 applications available for Mac OSX? |
Send message Joined: 27 Sep 08 Posts: 847 Credit: 692,008,677 RAC: 113,683 |
Last time around this was the disk was full so, I'm assuming the same again? |
Send message Joined: 12 Jul 11 Posts: 857 Credit: 1,619,050 RAC: 0 |
NO; actually. We now have the correct and planned amount of disk space. There are scheduling issues out with my comprehension. The MAC executable uses SSE always. (There are other issues with it though.....). Eric. |
Send message Joined: 27 Sep 08 Posts: 847 Credit: 692,008,677 RAC: 113,683 |
Sorry Eric, thanks for all the effort that your putting into this! |
Send message Joined: 12 Jul 11 Posts: 857 Credit: 1,619,050 RAC: 0 |
SNAFU on our side. Sending jobs with bad disk quota. Fixed, but you will probably see some jobs fail rather quickly. At least not wasting so much CPU. Eric. |
Send message Joined: 6 Jun 10 Posts: 6 Credit: 57,797 RAC: 0 |
2 Eric Mcintosh What "PNI" version means? Generec (non-optimized, standart x87 FPU)? If so - then what is the difference from the normal version (without specifying a modification) and "PNI" version? I get a wild mix of versions - simple, "PNI" and "SSE2". http://lhcathomeclassic.cern.ch/sixtrack/results.php?userid=193270SixTrack v444.01 SixTrack v444.01 (pni) SixTrack v444.01 (sse2) In general all except correct for my CPU - SSE3 :) The problem with the work of SSE3 code on AMD CPU has not been solved yet? (My main CPU AMD Phenom II X6) If so sheduler must send SSE2 - it work and validate OK. Why it mix versions? P.S. Speed comparation of versions (actualy not speed but Cr/hour ratio, but i read before that credits in project are awarded now in proportion to the volume of real work done, not the CPU time * CPU benchmark) standart 22.7 Cr/h (hour = CPU time, not runtime) PNI - 34.08 (average from last 9 tasks, 126k sec total) SSE2 - 37.71 (average from last 6 tasks, 42k sec total) |
Send message Joined: 9 Oct 10 Posts: 77 Credit: 3,671,357 RAC: 0 |
PNI stands for Prescott New Instructions. It's just another name of SSE3 instructions. |
Send message Joined: 19 Feb 08 Posts: 708 Credit: 4,336,250 RAC: 0 |
I am getting both sse2 tasks and pni tasks on my Opteron 1210. I am unable to say which run faster because the tasks may have different runtimes. All execute with no error and that is the important thing. Tullio |
Send message Joined: 12 Jul 11 Posts: 857 Credit: 1,619,050 RAC: 0 |
Assuming they work correctly (and I have tested all versions for numerical compatibility) SSE2/SSE3/PNI versions ate typically at least two times faster than the generic version which will run on any PC. Eric. |
Send message Joined: 9 Aug 05 Posts: 36 Credit: 7,698,293 RAC: 0 |
Assuming they work correctly (and I have tested all versions Now that we have the sse2/sse3/pni versions working quite impressively, any news about the development of an CUDA App? Thanks. Filipe. |
Send message Joined: 27 Aug 05 Posts: 2 Credit: 1,792,903 RAC: 0 |
I am still getting a few PNI and SSE2 at times. Not knowing the meaning of PNI (=SSE3) I aborted those alongside the SSE2. What about having an option to select apps in project preferences? PS: Congrats on your likely sensational finding at LHC! \o/ Never hoped we would see this so soon. |
Send message Joined: 27 Sep 08 Posts: 847 Credit: 692,008,677 RAC: 113,683 |
I can't see this happening, the effort to demonstate mathmatical equilvence would exceed the benifit of using CUDA. |
Send message Joined: 9 Aug 05 Posts: 36 Credit: 7,698,293 RAC: 0 |
I can't see this happening, the effort to demonstate mathmatical equilvence would exceed the benifit of using CUDA. There was a post from Eric talking about a GPU app (Before the cleaning of the news forum. I can't find it know). |
Send message Joined: 12 Jul 11 Posts: 857 Credit: 1,619,050 RAC: 0 |
Dear All; bit overwhelmed by our progress. Trying to keep up and keep the work flowing. Must take some time to analyse the results (very) soon. Even more important I have to finish the "user" doc so my colleagues can take advantage of this powerful tool. Plan to produce new executables with the new elements for the LHC, sse4 support too. Need to fix the MAC executable as well. GPUs are on the back burner at the moment; first SixTrack is Fortran and also I would need to track many more particles in each job. That might imply some serious re-design....Still I have used openMP and perhaps I could use openCL...all a bit vague. Personally I MUST take the time to publish my work on numeric portability. We are also planning a major improvement on the (CERN) user end to facilitate work submission and result retrieval. Eric. P.S. Using GPU's shouldl NOT be a problem for "mathematical equivalence". The parallelism is over particles which are independent during a turn. So we perform exactly the same computations, synchronise at each turn and so on. This would be fun and exciting but I can't do everything ! :-) |
Send message Joined: 9 Aug 05 Posts: 36 Credit: 7,698,293 RAC: 0 |
Thanks for the news Eric! Filipe |
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