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Number crunching :
New faster application?
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Send message Joined: 29 Aug 07 Posts: 115 Credit: 502,662,458 RAC: 545 |
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Send message Joined: 29 Aug 07 Posts: 327 Credit: 116,463,193 RAC: 0 |
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Send message Joined: 16 Jan 08 Posts: 98 Credit: 1,371,299 RAC: 0 |
So where do we stand? As Labbie said can people who have tested specify what download they used. Also can anyone get in contact with the guys/gals (or they themselves) who made the apps and find out if they did any testing before release. For your information I have been using the SSE3 version from the MW.rar file downloaded from Ice's site. For the moment I have set the machine to NNW and I will let it crunch out the remaining units. Then I guess I'll take it elsewhere while this is all sorted out. And can anyone confirm what Logan brought up?
If this is the case does that not mean there could be an issue with the stock app too? Never surrender and never give up. In the darkest hour there is always hope. |
Send message Joined: 12 Nov 07 Posts: 2425 Credit: 524,164 RAC: 0 |
So I guess this SSE3-Version saves the party for us. Are they close enough it won't change the outcome (of the search) or should they be exact? Doesn't expecting the unexpected make the unexpected the expected? If it makes sense, DON'T do it. |
Send message Joined: 30 Aug 07 Posts: 2046 Credit: 26,480 RAC: 0 |
So I guess this SSE3-Version saves the party for us. Yeah that's fine. I think the cutoff where it would start to matter would be differences greater than 10^-10ish |
Send message Joined: 26 Jul 08 Posts: 627 Credit: 94,940,203 RAC: 0 |
And can anyone confirm what Logan brought up? There are some issues with the stock app, but this accuracy thing is nothing you can really avoid between different architectures when using standard math libraries. And Travis answer (actually a question) to that problem At what level of accuracy? implies he is aware of that. Actually, this sort of differences in the last bits is what one often calls numerical noise. Both versions are likely to calculate results within the same error bars when compared to a (hypothetical) implementation with infinite (or just somewhat extended) precision. |
Send message Joined: 16 Jan 08 Posts: 98 Credit: 1,371,299 RAC: 0 |
And can anyone confirm what Logan brought up? Then perhaps the project can specify what the accepted 'error margin' is. Or is that the no difference greater than 10^-10ish. Never surrender and never give up. In the darkest hour there is always hope. |
Send message Joined: 27 Aug 07 Posts: 915 Credit: 1,503,319 RAC: 0 |
It's like Einstein and akosf all over again. Good times. me@rescam.org |
Send message Joined: 12 Nov 07 Posts: 2425 Credit: 524,164 RAC: 0 |
Yeah that's fine. I think the cutoff where it would start to matter would be differences greater than 10^-10ish So then the "new" optimized apps are fine to use as long as they are correct to the 10th place? So far only the ss3 has been confirmed to work out fine within the limit right? What about the sse2.rar app? Doesn't expecting the unexpected make the unexpected the expected? If it makes sense, DON'T do it. |
Send message Joined: 30 Aug 07 Posts: 2046 Credit: 26,480 RAC: 0 |
Yeah that's fine. I think the cutoff where it would start to matter would be differences greater than 10^-10ish Yeah, so long as it's just numerical noise. |
Send message Joined: 29 Nov 07 Posts: 39 Credit: 74,300,629 RAC: 0 |
Could someone please post a link to which one of these apps are supposedly ok. It's kind of confusing as there is more than one file download linked in the thread. thanks. |
Send message Joined: 12 Nov 07 Posts: 2425 Credit: 524,164 RAC: 0 |
Could someone please post a link to which one of these apps are supposedly ok. It's kind of confusing as there is more than one file download linked in the thread. If I have read it all I believe the sse3 app is the only one tested so far. No one else has said about the others. Doesn't expecting the unexpected make the unexpected the expected? If it makes sense, DON'T do it. |
Send message Joined: 29 Nov 07 Posts: 39 Credit: 74,300,629 RAC: 0 |
However there is more than one sse3 app linked in this thread one is astronomy_sse3_app and is 889kb and the other is astronomy_SSE3_s and is 920kb |
Send message Joined: 29 Aug 07 Posts: 327 Credit: 116,463,193 RAC: 0 |
So I guess this SSE3-Version saves the party for us. The app linked above is the only one I know of that is good. The last post above (the "Yeah that's fine" one) is from Travis. Calm Chaos Forum...Join Calm Chaos Now |
Send message Joined: 29 Nov 07 Posts: 39 Credit: 74,300,629 RAC: 0 |
Ok so that would make it the astronomy_SSE3_s one cool cause thats the one I'm using |
Send message Joined: 29 Aug 07 Posts: 115 Credit: 502,662,458 RAC: 545 |
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Send message Joined: 15 Aug 08 Posts: 163 Credit: 3,876,869 RAC: 0 |
@ Travis Didn't you tested it...? Bad boy...:) Try it, and give us your results. Best regards. Logan. BOINC FAQ Service (Ahora, también disponible en Español/Now available in Spanish) |
Send message Joined: 4 Oct 08 Posts: 1734 Credit: 64,228,409 RAC: 0 |
Travis/Dave Part of the assimilator update allows us to track users that repeatedly return invalid results and stop awarding credit to them How quickly do you guys expect this assimilator update to pick up users returning invalid results and stop awarding credit? Is it very soon (<1 day) or more? |
Send message Joined: 6 Apr 08 Posts: 2018 Credit: 100,142,856 RAC: 0 |
Travis/Dave And are you going to tell them or let them continue unaware? |
Send message Joined: 8 Mar 08 Posts: 4 Credit: 774,815 RAC: 0 |
So, we have a new version of the SSE3 app that meets the 10 digit requirement. Does anyone have an updated SSE or SSE2 version? Here we go... http://rapidshare.com/files/184217251/astronomy_sse2_app.rar.html Original app: fitness: -3.046272445362277 this one: fitness: -3.046272445362278 have fun... LB |
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