I have a Pentium II (no SSE) running Linux and BOINC 5.4.9. My ACE is about 0.81 on both SETI and Einstein, while DCF is 0.82 on SETI app 5.12 and 0.59 on Einstein app 4.16. Does this mean that Einstein runs better than SETI on my CPU? I gave a 3:1 relative share in favour of Einstein.
Tullio
Hello,
the DCF is an factor which describes how much a science application differs from its own standard.
Example:
Lets assume the initial Einstein S4 application had an DCF of 1
Then the estimated end time will be exactly met.
Akos optimized the application, now the computation is done 5 times faster. Then the DCF will drop to 0.2 - after that the estimated end time will also be correct.
Reducing DCF is done in small steps (each result finishing earlier than estimated reduces DCF a little bit) but increasing DCF is done in big steps (results finishing later than estimated increase DCF to that value that matches to the current processing time.
After all - you cann't compare DCFs between different projects!
Udo
Hello,
the DCF is an factor which describes how much a science application differs from its own standard.
Example:
Lets assume the initial Einstein S4 application had an DCF of 1
Then the estimated end time will be exactly met.
Akos optimized the application, now the computation is done 5 times faster. Then the DCF will drop to 0.2 - after that the estimated end time will also be correct.
Reducing DCF is done in small steps (each result finishing earlier than estimated reduces DCF a little bit) but increasing DCF is done in big steps (results finishing later than estimated increase DCF to that value that matches to the current processing time.
After all - you cann't compare DCFs between different projects!
Udo
Udo, thanks for the explanation. I am running also QMC@home, where my DCF is 1.5. This means that a WU shall be completed later than estimated. I see that in that project the CPU time/clock tima ratio is lower than in the other two.Also CPU efficiency is lower. Thanks again.
Tullio
RE: I have a Pentium II (no
)
Hello,
the DCF is an factor which describes how much a science application differs from its own standard.
Example:
Lets assume the initial Einstein S4 application had an DCF of 1
Then the estimated end time will be exactly met.
Akos optimized the application, now the computation is done 5 times faster. Then the DCF will drop to 0.2 - after that the estimated end time will also be correct.
Reducing DCF is done in small steps (each result finishing earlier than estimated reduces DCF a little bit) but increasing DCF is done in big steps (results finishing later than estimated increase DCF to that value that matches to the current processing time.
After all - you cann't compare DCFs between different projects!
Udo
Udo
RE: Hello, the DCF is an
)
Udo, thanks for the explanation. I am running also QMC@home, where my DCF is 1.5. This means that a WU shall be completed later than estimated. I see that in that project the CPU time/clock tima ratio is lower than in the other two.Also CPU efficiency is lower. Thanks again.
Tullio
RE: RE: That's odd.
)
I looked at my old posts about speeds with Akos S4 applications.
On my Sempron 3000+ I had the following speeds with these different versions.
U41.01 2,660.72 (SSE3)
S41.06 2,960.84 (SSE)
S40.12 3,779.44 (SSE)
Then you're really interested in a subject, there is no way to avoid it. You have to read the Manual.