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Simon .... answer this please?

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Azzitude:
how does this actually see the L2 Cache? is there something I can edit to show it?



I have tried V2 sse and it shows the same as V1.41 SSSE4

Simon:
Ben Herndon coded a CPU identification program which he then included in the S@H source code.

That checks out what kind of CPU you have, how much cache and how many CPUs, how quick the L1, L2 and RAM are and what SIMD level is supported.

No, you can not edit what it prints, that comes with the optimized app. You could recompile it and change what it prints, or the table it gets its info from by modifying the source code.

Regards,
Simon.

Azzitude:
so  does boinc see and use the L2 or no?

just a little confused at how 2 almost identical machines have an 800-900 rac difference

Simon:
BOINC does not "see" the cache because the stock BOINC app doesn't really measure cache, it has a fixed value set (because until now 5.4.x at least, cache detection just wasn't implemented). So every Windows host using stock BOINC lists exactly the same amount in the online stats (BenHer built a version that does correct cache detection and future/current beta stock BOINC versions should have code that does this).

However, that's got nothing to do with whether it gets used for crunching. Your CPU's L1 & L2 cache definitely gets used fully, that's for sure - and all crunching is done by the science app, not BOINC directly.

L1 & L2 cache get filled with stuff before it's needed in current generation CPUs (like your Core 2 system) most of the time because of "prefetching" logic built into the CPU hardware itself. Some of the optimized code also uses prefetching commands to fill the cache with necessary data and speed up execution.

What systems are you talking about, and can you provide a CPU-Z report for both? I'd like to compare the components, maybe I can figure out what's the matter then.

Regards,
Simon.

msattler:

--- Quote from: Azzitude on 05 Jan 2007, 12:27:23 pm ---so  does boinc see and use the L2 or no?

just a little confused at how 2 almost identical machines have an 800-900 rac difference

--- End quote ---

Azzy, which 2 nearly identical machines are you referring to?  Boinc doesn't define using the L cache.  That's strictly a processor thingy.  I gotta problem with my core 2 using the hard drive all the time, but I haven't really found the problem yet.  To page or not to page, that is the question...........

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