question about gc

question about gc

[Nicolas Ojeda Bar]

Hi all,

Is there a way to tell how much time has been spent in
the gc at a particular point in time from inside your
compiled code?

Thanks!
N

Re: [Caml-list] question about gc

[Richard W.M. Jones]

On Wed, Dec 15, 2010 at 04:15:34PM -0500, Nicolas Ojeda Bar wrote:
> Is there a way to tell how much time has been spent in
> the gc at a particular point in time from inside your
> compiled code?

Yes, use standard profiling tools.  gprof will give you some idea, but
oprofile is much more accurate.

Rich.

-- 
Richard Jones
Red Hat

Re: [Caml-list] question about gc

[Jesper Louis Andersen]

On Thu, Dec 16, 2010 at 00:43, Richard W.M. Jones <rich@annexia.org> wrote:
> On Wed, Dec 15, 2010 at 04:15:34PM -0500, Nicolas Ojeda Bar wrote:
>> Is there a way to tell how much time has been spent in
>> the gc at a particular point in time from inside your
>> compiled code?
>
> Yes, use standard profiling tools.  gprof will give you some idea, but
> oprofile is much more accurate.

Is 'perf' from the linux kernel source tree, /usr/src/linux/tools/perf
i believe, useful here? I tend to find it more useful and simpler than
oprofile - but I am not sure you can find the gc-entry point.



-- 
J.

Re: [Caml-list] question about gc

[Eray Ozkural]

[-- Attachment #1: Type: text/plain, Size: 459 bytes --]

On Thu, Dec 16, 2010 at 1:43 AM, Richard W.M. Jones <rich@annexia.org>wrote:

> On Wed, Dec 15, 2010 at 04:15:34PM -0500, Nicolas Ojeda Bar wrote:
> > Is there a way to tell how much time has been spent in
> > the gc at a particular point in time from inside your
> > compiled code?
>
> Yes, use standard profiling tools.  gprof will give you some idea, but
> oprofile is much more accurate.
>


I wasn't aware of oprofile, it looks wicked!!!

Best,

--
Eray

[-- Attachment #2: Type: text/html, Size: 827 bytes --]

Re: [Caml-list] question about gc

[Richard W.M. Jones]

On Fri, Dec 17, 2010 at 03:22:41AM +0200, Eray Ozkural wrote:
> On Thu, Dec 16, 2010 at 1:43 AM, Richard W.M. Jones <rich@annexia.org>wrote:
> 
> > On Wed, Dec 15, 2010 at 04:15:34PM -0500, Nicolas Ojeda Bar wrote:
> > > Is there a way to tell how much time has been spent in
> > > the gc at a particular point in time from inside your
> > > compiled code?
> >
> > Yes, use standard profiling tools.  gprof will give you some idea, but
> > oprofile is much more accurate.
> >
> 
> 
> I wasn't aware of oprofile, it looks wicked!!!

oprofile is quite nice.

However, systemtap is really interesting.  [From a language
perspective ...] it's a type-safe language with type inference that
compiles down to C, compiles the C into a kernel module which is
injected into the Linux kernel and lets you do all sorts of amazing
stuff.  The fact that it's a mainstream tool that uses proper type
inference is significant alone, the fact that it's seriously useful is
icing on the cake.

http://sourceware.org/systemtap/examples/keyword-index.html

Rich.

-- 
Richard Jones
Red Hat