Posts by Otter

1) Message boards : Application Code Discussion : PPC64 Optimizations (Message 16158) Posted 20 Mar 2009 by Otter Post: Unless you write SPE specific code, and plug it into the app - the performance you are going to see is that of 2 Power5 PPC chips using AltiVec. Which is dated (but not bad) The trick will be taking some function in the MW code (a large FFT would be good), and then using the SPUs to solve it. I am not sure of the state of opensource Cell libraries, but there must be something. Also, just using gcc on the linux command line will only generate PPE code (Power5 code), the SPU code must be compiled separately and then linked to the PPE code.
2) Message boards : Number crunching : Core i7 and Optimized App (Message 12483) Posted 23 Feb 2009 by Otter Post: I have been running dry periodically, so increasing the work available would be nice, that and changing the work unit per core quota to double. Would give you more units in progress, and lower the chance that some machine ends up idle
3) Message boards : Number crunching : search progress visualization (Message 11557) Posted 19 Feb 2009 by Otter Post: I'd like to know the definition of fitness. Also when you say the particles are 'swarming' - how do stars swarm? Or better - what are particles? My naive thoughts are - I look at the sky from time to time, and (from my perspective), those stars move reallllly slowly. So if you are looking at telescopic imagery, how are you getting motion? Edit- I am being naive on purpose, as people that crunch aren't necessarily astrophysicists, so simple things are undefined to them, the galaxy just boils down to stars and space, and they may have little knowledge of anything more!
4) Message boards : Number crunching : search progress visualization (Message 11468) Posted 18 Feb 2009 by Otter Post: Bump, I would highly recommend you keep the little blurb about this thread on the main page. It is definitely more interesting than credit/code changes!
5) Message boards : Number crunching : search progress visualization (Message 11128) Posted 17 Feb 2009 by Otter Post: Fun stuff! SOR is just an optimal Gauss-Seidel method, which is just an optimized Jacobi method. I'll be honest, I have *almost* no idea what you are talking about, but I think I get the big picture. But when you say convergence - what the particles converging to? Also in the big picture how does this relate to images of the galaxy?
6) Message boards : Number crunching : search progress visualization (Message 11120) Posted 17 Feb 2009 by Otter Post: Interesting stuff. Travis wrote: p[i][j] = w * v[i][j] + c1 * r1 * (g[j] - p[i][j]) + c2 * r2 * (l[i][j] - p[i][j]) So tell me, your equation looks similar to the SOR iterative method (but not). Is that what W is? (The relaxation constant). I have studied (introductory) iterative methods, so please be gentle ><
7) Message boards : Application Code Discussion : source v0.16 :P (Message 9501) Posted 1 Feb 2009 by Otter Post: Hi I am fairly new to MilkyWay, to the devs, if possible could you add your Visual Studio solution/project files to the source release? I have VS 2005, but I am not sure how to get the BOINC source and milkyway to talk in VS. Alternatively, if you could just put the entire source tree (plus the required boinc source code) in SVN/CVS/Git it would be much easier. Just checkout and click the solution. I say this because I don't mind test compiling milkyway on windows, but I need to figure out how to compile it on Windows first ><, I do most of my development work on Linux (MPI/cluster applications). Anyway, good luck on get windows optimized!