1) Questions and Answers : Wish list : Boinc Version 5.1.3 (Message 10095)
Posted 12 Sep 2005 by Charles Elliott
Post:
Boinc Version 5.1.3 appears to work, and it solves a number of problems associated with versions 4.19 and 4.45. 5.1.3 will upload completed LHC WUs, but it will not download new ones. Please consider upgrading the LHC server.
2) Questions and Answers : Sixtrack : optimize sixtrack for amd athlon xp (Message 10094)
Posted 12 Sep 2005 by Charles Elliott
Post:
What's a TGV?
3) Questions and Answers : Wish list : Numerical Accuracy (Message 7321)
Posted 29 Apr 2005 by Charles Elliott
Post:
> Arbitrary precision comes at the price of speed, by a factor of possibly
> several hundred. This is OK if there is a small amount of calculation, but is
> completely unacceptable for a program that has days worth of floating point
> processing to do.
>

When I run one of my programs under a debugger it can take hours to execute a few hundred instructions, but when I am done the program is correct.
4) Questions and Answers : Sixtrack : Cryptography (Message 7136)
Posted 21 Apr 2005 by Charles Elliott
Post:
Repeat after me: "I am cryptic."
5) Questions and Answers : Wish list : Numerical Accuracy (Message 7036)
Posted 15 Apr 2005 by Charles Elliott
Post:
I have a suggestion for attacking the differences you are observing between CPUs. Why not reprogram the parts of your algorithm that are exhibiting problems in Lisp or some other language that has infinite (arbitrary) precision arithmetic built in? In the alternative you could put in one of the several infinite (arbitrary) precision arithmetic packages written in C/C++ available on the Internet. (References to these can be found in several issues of C/C++ Users Journal or you could Google it. Also Knuth has several algorithms for (arbitrary) infinite precision arithmetic in one of his books, but the language is somewhat obtuse.) You might see two benefits to this approach: 1) You would know exactly what the answers should be; and 2) If you output intermediate results (to a file or somewhere) you could determine where in the calculations the differences were first appearing.
6) Questions and Answers : Sixtrack : Alpha Test Server (Message 6818)
Posted 4 Apr 2005 by Charles Elliott
Post:
Where is this alpha test server? The regular URL reports no work available.
7) Questions and Answers : Sixtrack : No Work (Message 5842)
Posted 22 Feb 2005 by Charles Elliott
Post:
I reset the project. I have never received a WU this year. Yet the server returns "No work available (daily quota exceeded)"
8) Questions and Answers : Sixtrack : can't open log file (Message 5367)
Posted 30 Nov 2004 by Charles Elliott
Post:
It has been doing this for hours:

2004-11-30 07:33:38 [LHC@home] Scheduler RPC to http://lhcathome-sched1.cern.ch/scheduler/cgi succeeded
2004-11-30 07:33:38 [LHC@home] Message from server: Server can't open log file

Please don't post that your system is working when it is not. It costs us money to do this.
9) Questions and Answers : Sixtrack : Changed credit computation (Message 4768)
Posted 1 Nov 2004 by Charles Elliott
Post:
Did LHC change the formula for computing credit? New values are obviously not an average with highest and lowest entries ignored.
10) Questions and Answers : Sixtrack : WU State (Message 3799)
Posted 14 Oct 2004 by Charles Elliott
Post:
The following two WUs exhibit the same symptom (where first column is WU identifier):
394065 5624 6.62 1 Oct 2004 6:46:18 UTC
394068 5624 6.56 1 Oct 2004 6:46:18 UTC

Three copies were handed out to be processed on 9/27, one has been completed, one has been declared to be over, and one is still being waited for. Isn't this an inconsistent state? Why is one still being waited for? Should not both handed out on 9/27 and not received be declared over?



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