Posts by D J Blumer

1) Questions and Answers : Macintosh : making the deadline... (Message 94475)
Posted 14 Apr 2020 by D J Blumer
Has the deadline for workunits been decreased lately? I now am getting ones with deadlines within 1- 2 days of when I receive them. I noticed that some are not completing in time anymore, which seldom, if ever, happened in all the many years I've run R@h. I have shortened the downloaded days of work to 1 day from the 2 days I had until now. I hope that solves the problem. I wasted quite a bit of computer time on results that were declared invalid due to missing the deadline.
2) Message boards : Number crunching : Rosetta@Home version 3.26 (Message 72844)
Posted 20 Apr 2012 by D J Blumer
As reported widely, the Mac OSX versions of 3.24 and 3.26 are showing extremely poor performance, which is reflected in abnormally low "granted credit" scores compared to all previous versions. The Granted Credit is ~4 -5 times lower than the "Claimed Credit" now! Clearly, version 3.26 did not fix the problem introduced by 3.24. At first, I thought this might be a glitch in the scoring system, but after analyzing the result reports, I no longer think that is the case. I have a 21000-second time preference set and usually a large number of decoys are attempted and finish within the time window on my 3.2 GHz Mac Pro. Many of my results have only one decoy attempt now, so the low granted credit is probably correct.

However, that implies that a serious bug was introduced in v3.24. Is this is receiving priority attention by the Rosetta programmers? Not only is the calculation efficiency dramatically reduced, but I worry that the technical accuracy of the results may be poor, also. As a Mac OSX developer, I know there have been lots of changes in Xcode recently and thus more opportunities for code to break that used to work fine previously.
3) Questions and Answers : Wish list : Optimized Client Versions or Source code? (Message 2549)
Posted 7 Nov 2005 by D J Blumer
Have the Rosetta clients been extensively optimized for each type of processor? I am running an optimized version of SETI@Home for the Mac G5 (hand optimized Altivec vectorized code, G5 compiler optimizations, Shark, etc.) which is about 2X-3X faster than the conventional OSX client (~3000 sec vs 9000 sec/SETI WU). Would Rosetta benefit much from the hardware vector processor and/or other optimizations, or has this already been exhausted?

©2021 University of Washington