Re: [OctDev] valgrind for oct files?

[Andy B. <and...@gm...>]

> On Wed, 2012-08-22 at 12:21 +0100, Andy Buckle wrote:
>> On 22 August 2012 12:11, dirk <dir...@co...> wrote:
>> > Hello all -
>> > I'm trying to learn valgrind for oct files... can anyone share a working
>> > example I could study?
>> > Hope so, thanks
>> > - dirk
>>
>> Invoke octave from the command line of your OS, in a way that calls
>> your oct-file function. Run the whole of octave through valgrind. You
>> will probably want to generate suppressions by doing this and not
>> calling your oct-file.
>>
>> In the past i have also used pre-processor to change around the code,
>> so i can call parts of my code from the OS, instead of from Octave.
>> This is much faster than running the whole of Octave through valgrind.
>>
>> Which bit do you want examples of?

On 22 August 2012 20:58, dirk <dir...@co...> wrote:
> thanks for the tips Andy.
> I suspect my issues are just newbie problems, so any & all advice is
> helpful.  Here's an example point of confusion:
>
> $ valgrind octave --eval exit &> octave_grind.txt
>
> gets me this in the .txt:
>
> ==17994== LEAK SUMMARY:
> ==17994==    definitely lost: 3,108 bytes in 116 blocks
> ==17994==    indirectly lost: 27,994 bytes in 201 blocks
> ==17994==      possibly lost: 659,439 bytes in 3,101 blocks
> ==17994==    still reachable: 34,585,196 bytes in 6,407 blocks
> ==17994==         suppressed: 0 bytes in 0 blocks
>
> which seems to be telling that I lose 3k by just starting and stopping
> octave... hard to believe.
>
> If it matters, I'm running octave 3.4.2 under linux, installed via
> apt-get.
>
> - dirk

(ooops, I forgot to reply-all)

It's common to see that. I get the same kind of thing. It is probably
Octave (or the libraries it depends on).

Run that and make a suppression file to exclude the things that are
not your fault. Then run your code through valgrind in a similar way,
and you should only see things that are your fault. Write a bit of bad
code on purpose to see what you get.

Andy



-- 
/* andy buckle */