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Old 2008-10-23, 06:10   #12
mdettweiler
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But even for users running Linux, it's still recommended to use separate instances rather than multiple threads within one instance, for performance reasons, right? Or were those performance issues resolved in a recent version?

Last fiddled with by mdettweiler on 2008-10-23 at 06:10
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Old 2008-10-23, 06:29   #13
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Thanks for the prompt replies. I'm using my work computer running WinXP 32 bit. Hopefully it'll all go well.
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Old 2008-10-23, 07:44   #14
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For some reason, I don't seem to be able to edit my own posts. The forum says I can, but there is no "Edit" button available.

Reporting, sieving commenced, looks good. ~40 hours for the 1T range. Looking at geoff's numbers, this seems about right.

(If a mod wants to merge this into the previous post, or figure out why I can't edit my own posts...? Ta!)
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Old 2008-10-23, 09:19   #15
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Quote:
Originally Posted by paleseptember View Post
For some reason, I don't seem to be able to edit my own posts. The forum says I can, but there is no "Edit" button available.
the edit button is available for only few minutes (5 to 10 i think) after entering your post!
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Old 2008-10-23, 15:20   #16
mdettweiler
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Quote:
Originally Posted by kar_bon View Post
the edit button is available for only few minutes (5 to 10 i think) after entering your post!
Actually, I think it's an hour (unless that's one of the many things that's gotten changed in the recent forum upgrade and the events surrounding it). After the specified period of time is up, only moderators can still see the Edit button.
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Old 2008-10-24, 23:10   #17
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Benchmark Timings for Q6700, four cores, one instance per core, sr2sieve 1.8.2 32-bit windows xp

Range: 5-6T
Time: 39hours 15mins
5303 factors.
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Old 2008-10-25, 00:49   #18
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Quote:
Originally Posted by mdettweiler View Post
But even for users running Linux, it's still recommended to use separate instances rather than multiple threads within one instance, for performance reasons, right? Or were those performance issues resolved in a recent version?
The sieving algorithm itself gains nothing in speed from multithreading (but it does use less memory), and there is a fixed overhead of communicating between parent and child threads, so you can expect it to run a little slower. But for a large sieve the fixed overhead works out as only a small percentage of overall time taken, so the gains in convenience are usually considered worth it. (My time is more valuable than CPU time :-)

Before anyone asks why the Windows version doesn't have multithreading, it is because the Windows executables were compiled with the MinGW cross-compiler which is missing some of the standard Unix library functions such as fork(). It might be possible to use the Cygwin compiler to create a multithreaded Windows executable.
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Old 2008-11-06, 21:25   #19
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As of sr2sieve version 1.8.3 The -d switch is no longer required.
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Old 2008-11-17, 06:12   #20
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My home computer was distinctly sluggish with version 1.8.3 until I ran it with the -z switch to choose a lower priority. This computer is practically an antique, a 1400 MHz Athlon XP based system, so maybe people with newer systems will not see this problem, but I just wanted to let you know in case you see the same thing.
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Old 2008-11-21, 01:42   #21
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Default New sieve file uploaded

I just replaced the old sieve file with a new one, about 8.2% smaller. In sieving from 1 trillion to 12 trillion, the file was reduced from 859,098 entries to 788,339 entries with a net elimination of 70,759 candidates. Thanks to hhh, paleseptember, myself, and champion siever geoff, the author of this outstanding sieving program!

PRP testing is almost complete up to all candidates below 500,000 digits, with ranges up to 540,000 digits already reserved. As the current work files only go up to about 632,000 digits, and paleseptember seems to be burning through them like there's no tomorrow, I plan to switch from PRP testing to sieving soon so that we can be ready with well-sieved files when we go past n=2.1 million. If anyone wants to join me, especially those with 64-bit systems (hint, hint!) - but even my lowly Pentium D can make a valuable contribution at this stage - please feel welcomed!

Last fiddled with by philmoore on 2008-11-21 at 06:33 Reason: Paleseptember is still crunching through new ranges!
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Old 2009-01-07, 19:06   #22
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Hey guys need a liltle help on Ubuntu 8.10 Ibex x64. I am not able to run sr2sieve on this box. When I type in or cut and paste " sr2sieve -i dual_s.abcd -p 29e12 -P 30e12 " I get command not found. I made sure that sr2sieve is executable.

Since this box is dual booted with XP32 sp3, I tried it on xp and it was able to run sr2sieve. I am using the correct files for each os. Windows on xp and linux on x64. Any areas I need to check or change. thanks.
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