low-level profiling

[Nicolas Frisby]

No, nothing fancy. It's just a nofib program.

I am seeing the .size directives in the .s files. And objdump -S gives
output like this:

0000000000000368 <c2hw_info>:
 368: 48 83 e3 07           and    $0x7,%rbx
 36c: 48 83 fb 02           cmp    $0x2,%rbx
 370: 0f 83 96 00 00 00     jae    40c <c2hA_info+0x5c>
 376: 48 8b 45 08           mov    0x8(%rbp),%rax
...

so it's just perf that's going awry?

... investigating perf ...

This might be my issue:

http://us.generation-nt.com/answer/tip-perf-urgent-perf-symbols-handle-proc-sys-kernel-kptr-restrict-help-203499422.html

Now I just have to decode all of that!


On Fri, Feb 15, 2013 at 6:48 PM, Johan Tibell <johan.tibell at gmail.com>wrote:

> On Fri, Feb 15, 2013 at 10:24 AM, Nicolas Frisby <nicolas.frisby at gmail.com
> > wrote:
>
>> I'm not passing any flags related to code generation, I don't think.
>>
>> $HC -H64m -O -Rghc-timing -package array -H32m -hisuf hi -O1 -rtsopts -c
>> Main.hs -o Main.o
>>
>> So that'd just be the native code generator, right?.
>>
>> $ uname -a
>> Linux cam-05-unx 3.2.0-35-generic #55-Ubuntu SMP Wed Dec 5 17:42:16 UTC
>> 2012 x86_64 x86_64 x86_64 GNU/Linux
>>
>> Is there a objdump-ish way to directly look for these .size directives?
>>
>> Thanks Johan.
>>
>
> If you tell GHC to keep all temporary file you could look in the .S files
> for the .size directive. It could be that I missed some place where we
> ought to put a .size directive. Are you doing dynamic linking?
>
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