peak memory usage

[Rares Vernica]

Hi,

What is the right way/tool to find the peak memory usage of a C++ program?

I tried Valgrind but is does not seem to be able to answer my question.

Thanks a lot,
Ray

[Ian Collins]

Rares Vernica wrote:

Hi,

What is the right way/tool to find the peak memory usage of a C++ program?

Either do it yourself with a custom allocator, or use whatever tools
your operating environment provides.

--
Ian Collins.

[Rares Vernica]

Ian Collins wrote:

Rares Vernica wrote:

>Hi,

What is the right way/tool to find the peak memory usage of a C++ program?

Either do it yourself with a custom allocator, or use whatever tools
your operating environment provides.

Can you please name a few tools? I am using Linux.

I know "top" shows the memory usage, but it shows it in real time and it
is difficult to get the peak.

Thanks,
Ray

[Ian Collins]

Rares Vernica wrote:

Ian Collins wrote:

>Rares Vernica wrote:

>>Hi,

What is the right way/tool to find the peak memory usage of a C++
program?

Either do it yourself with a custom allocator, or use whatever tools
your operating environment provides.

Can you please name a few tools? I am using Linux.

I prefer the custom allocator approach, as for tools, you should ask on
a Linux development group or comp.unix.programmer.

--
Ian Collins.

[Michael Oswald]

Can you please name a few tools? I am using Linux.
IIRC memusage. Puts out a log or even a png graphic with the memory
usage. Used it a lot some time ago for debugging purposes
Michael

[Fei Liu]

Rares Vernica wrote:

Hi,

What is the right way/tool to find the peak memory usage of a C++ program?

I tried Valgrind but is does not seem to be able to answer my question.

Thanks a lot,
Ray

You didn't try valgrind hard enough, search 'messif'. Valgrind does give
you detailed memory usage. Why wouldn't it? All your memory
allocation/deallocation are detoured through valgrind.

Fei

[Jacek Dziedzic]

Rares Vernica wrote:
<OT>

I know "top" shows the memory usage, but it shows it in real time and it
is difficult to get the peak.

Well, "man top" says top has batch mode operation, perhaps you could
use that?

</OT>

[Rares Vernica]

Fei Liu wrote:

Rares Vernica wrote:

>Hi,

What is the right way/tool to find the peak memory usage of a C++
program?

I tried Valgrind but is does not seem to be able to answer my question.

Thanks a lot,
Ray

You didn't try valgrind hard enough, search 'messif'. Valgrind does give
you detailed memory usage. Why wouldn't it? All your memory
allocation/deallocation are detoured through valgrind.

Fei

I especially tried Massif.

Quote from the Valgrind mailing list:

"I would like to know just the size of the memory my program is using.

Does the following information from memcheck answer my question?

==14776== malloc/free: 594,317 allocs, 594,317 frees, 15,403,721 bytes
allocated.

No. That's the total allocated. You want the peak, I presume.

If not, how can I compute the total memory usage from this massif

output:

>
==14494== Total spacetime: 522,204,199,298 ms.B

You can't, unfortunately.

---

Yes, I would like to know the peak.

Is there a way to find it out?

Not without modifying Massif.
"

Ray

[Rares Vernica]

Jacek Dziedzic wrote:

Rares Vernica wrote:
<OT>

>I know "top" shows the memory usage, but it shows it in real time and
it is difficult to get the peak.

Well, "man top" says top has batch mode operation, perhaps you could
use that?

</OT>

Even in batch mode, I would need to run top exactly when the memory
usage in my program is at peak.

Thanks,
Ray

[Rares Vernica]

Michael Oswald wrote:

>Can you please name a few tools? I am using Linux.

IIRC memusage. Puts out a log or even a png graphic with the memory
usage. Used it a lot some time ago for debugging purposes
Michael

memusage seems to do the job.

Thanks a lot,
Ray

[Michael Ekstrand]

On Wed, 21 Mar 2007 09:54:46 -0700, Rares Vernica wrote:

If not, how can I compute the total memory usage from this massif

output:

>
==14494== Total spacetime: 522,204,199,298 ms.B

>
You can't, unfortunately.
>
>

---

Yes, I would like to know the peak.

Is there a way to find it out?

Not without modifying Massif.

If memory serves correctly, Massif produces a plot of memory consumption
over time. Would that get you at least close enough to what you need?

- Micchael

[Rares Vernica]

Michael Ekstrand wrote:

On Wed, 21 Mar 2007 09:54:46 -0700, Rares Vernica wrote:

> If not, how can I compute the total memory usage from this massif

output:

> >
==14494== Total spacetime: 522,204,199,298 ms.B

You can't, unfortunately.

---

> Yes, I would like to know the peak.

Is there a way to find it out?

Not without modifying Massif.

If memory serves correctly, Massif produces a plot of memory consumption
over time. Would that get you at least close enough to what you need?

- Micchael

Yes, you are correct, it produces a plot, but is difficult to get the
peak exactly.

Thanks,
Ray