On 30 March 2006 14:34, Pete wrote:
> The executable is produced with:
>
> $ make
> g++ -W -Wall -O9 -funroll-loops -mtune=pentium4 -c
> -o matrix_mult_r.o matrix_mult_r.cc
Heh.
matrix_mult_r.cc:5:19: Timer.h: No such file or directory
matrix_mult_r.cc: In function `int main()':
matrix_mult_r.cc:20: error: `Timer' undeclared (first use this function)
matrix_mult_r.cc:20: error: (Each undeclared identifier is reported only once
for each function it appears in.)
matrix_mult_r.cc:20: error: expected `;' before "timer"
matrix_mult_r.cc:21: error: `timer' undeclared (first use this function)
> g++ -W -Wall -O9 -funroll-loops -mtune=pentium4 -c
> -o Timer.o Timer.cc
Ah, yes. I had a bit of a problem with that particular stage of the
proceedings as well....
However, it's straightforward enough. The default thread stack is 1Mb (or
is it 2, I can't remember off the top of my head). Once your stack-based auto
vars exceed the size of the stack, it go BOOOOOM!
Your problem can be fixed /either/ by making them of static storage duration
(move them out of the function body OR add the 'static' qualifier depending on
scoping considerations), or by using the -Wl,--stack flag. Correctly. You
told ld to provide an 8kB stack. Try 80 meg instead, it works a lot beter!
cheers,
DaveK
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