Dear Stefan Schaal,
In message <[email protected]> you wrote:
> Sorry, I attached the wrong C-program in the previous posting ....
> here is the corrected version:
I'm not sure what exactly you are trying to test, but I think you
should invest a little more time in your test cases.
> attached is a little C program that spawns off a task which runs a
> heavy tiny math job. Despite my 8 processor machine, taking this one
Does it? Not for me.
> void
> run_task(void *dummy)
> {
> int i;
> double foo = 1.0;
>
> for (i=1; i<=100000000; ++i)
> foo = foo*1.1;
>
> return;
> }
On x86, this code compiles for me into this:
.text
.p2align 4,,15
.globl run_task
.type run_task, @function
run_task:
pushl %ebp
movl %esp, %ebp
popl %ebp
ret
.size run_task, .-run_task
.ident "GCC: (GNU) 4.4.1 20090725 (Red Hat 4.4.1-2)"
.section .note.GNU-stack,"",@progbits
Similar on ARM and Power.
As you can see, the compiler completely optimizes away your "tiny math
job". So what should be loading your CPU?
Best regards,
Wolfgang Denk
--
DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
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