On 03/31/2006 15:08 +0200, Miguel González Castaños wrote: >> Dear all, >> >> I am trying to launch CPU tests on a Pentium IV Prescott 3.0 Ghz with >> 4Gb of RAM. I have tried some tests from distributed.net and everything >> seems to be ok, although with the test attached in the email (sorry for >> the size of the mail), I am experiencing some problems. As you can see >> with the static flag the number generation is faster than without that That part is not surprising once you understand the dynamic linking mechanism - it adds a small amount of overhead to every function call into the library, because each function call is essentially an indirect call. That said, the amount of overhead you're seeing does seem a bit higher than I would expect (and the sqrt() case is possibly because the compiler converts the sqrt() call into a fsqrt instruction in both cases because of the -O3 - there is no instruction set equivalent for the rand(), random() and log() cases). tw -- twalberg@xxxxxxxxxxxxxx - : send the line "unsubscribe linux-admin" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
