Hi there,
in the thread
http://is.gd/4EMT8
David and I agreed that M4RI should have a better, more robust and cross-
platform mechanism to check for cache sizes.
Thus I wrote a little C program to check for the cache size using timings of
random-ish memory access.
The program is available at:
http://sage.math.washington.edu/home/malb/cache.c
On my Core 2 Duo and on my Opteron (both running Linux 64-bit) it does report
correct sizes. So far so good. On sage.math it reports L3 cache size instead
of L2 but I guess that this is probably what we want anyway (well, L2 is 3MB
which I don't check explicitly since I only check powers of two)
I'd appreciate if those people on this list who have different hardware or
software (OSX, Solaris, PPC, Sparc) could compile the program and report back
whether the program reports correct sizes for them. To compile and run:
gcc -std=c99 -O3 cache.c -o cache
./cache
Cheers,
Martin
--
name: Martin Albrecht
_pgp: http://pgp.mit.edu:11371/pks/lookup?op=get&search=0x8EF0DC99
_otr: 47F43D1A 5D68C36F 468BAEBA 640E8856 D7951CCF
_www: http://www.informatik.uni-bremen.de/~malb
_jab: martinralbre...@jabber.ccc.de
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