Re: [Valgrind-users] using valgrind at specific point while running program

[Vasily G. <vas...@gm...>]

Yes, unfortunately, you are right. Since Valgrind binary translates your
program and track all memory read\write you have to run Memcheck at the
start of your program.
Maybe you can somehow reduce run path of your program changing some
functions to simpler one. So, my point is - try to localize problem fix it
and run full test (2,5 hours) only once.

Vasily


On Mon, Aug 26, 2013 at 5:17 PM, Mahmood Naderan <nt_...@ya...>wrote:

>
> >What particular tool would you like to use (Memcheck, Callgrind, Massif)?
>
> Unfortunately I want to use memcheck which seems to be impossible
>
> Regards,
> Mahmood*
> *
>
>   ------------------------------
>  *From:* Vasily Golubev <vas...@gm...>
> *To:* "val...@li..." <
> val...@li...>
> *Sent:* Monday, August 26, 2013 5:12 PM
>
> *Subject:* Re: [Valgrind-users] using valgrind at specific point while
> running program
>
> Hello, Mr. Naderan.
>
> What particular tool would you like to use (Memcheck, Callgrind, Massif)?
> If callgrind - you can switch off instrumentation at the start and then
> switch it on at some particular point (or time). In any case, at first -
> please test your program with:
> valgrind --tool=none ./path-to-your-program
> If it spends a lot of time then probably Valgrind (like Memcheck, Massif,
> etc) is useless for you because of time constrains.
> I mean: None - is the fastest tool of Valgrind. It doesn't detect any
> errors, simply run your code.
> If it runs quite fast (for you) and you want to collect only call-graph
> (use Callgrind) - then you can look at parameters for Callgrind.
>
> Vasily
>
>
> On Mon, Aug 26, 2013 at 12:00 PM, Mahmood Naderan <nt_...@ya...>wrote:
>
> Thanks. To be honest, I didn't understand!
> It seems that with these macros, I can insert them in the specific section
> of the code. However my problem is different. There are iterative
> functions. So I want to start valgrind after, say, 0.5 hours of execution
> to see what is going on.
>
>
> Regards,
> Mahmood
>
>
>
> ----- Original Message -----
> From: Konstantin Tokarev <an...@ya...>
> To: Mahmood Naderan <nt_...@ya...>; "
> val...@li..." <
> val...@li...>
> Cc:
> Sent: Monday, August 26, 2013 12:17 PM
> Subject: Re: [Valgrind-users] using valgrind at specific point while
> running program
>
>
>
> 26.08.2013, 11:45, "Mahmood Naderan" <nt_...@ya...>:
> > I want to use valrgind at a specific time while my program is running.
> For example, when I use -O3 it will take 0.5 hours to reach the desired
> point. When I use -g -ggdb it will take nearly 2.5 hours to reach the
> desired point.
> >
> > Now if I use valgrind with -g -ggdb, the program is extremely slow and I
> can not predict when it reach the desired point.
> > What should I do?
>
> Use client requests:
>
> http://valgrind.org/docs/manual/manual-core-adv.html
>
> --
> Regards,
> Konstantin
>
>
>
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> Vasily
>
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-- 
Best Regards,
Vasily