[Pharo-project] Memory usage

jannik.laval jannik.laval at gmail.com
Tue Jul 31 09:18:19 EDT 2012

Hi Dave,

I begin with a small problem (is it ?): my os is the latest apple macos.
It seems that there is no squeak vm 64 for macos (I did not find it).

How can I build one "easily" ?


On Jul 24, 2012, at 2:04 PM, David T. Lewis <lewis at mail.msen.com> wrote:

> On Tue, Jul 24, 2012 at 09:27:49AM +0200, jannik.laval wrote:
>> Hi Dave,
>> Should I load the SystemTracer available on SqueakSource ? The last version is from 2011, and seems old, no ?
>> When I try it, it calls some methods that do not exist in Pharo.
>> Do you have more information on how to use it ?
> Hi Jannik,
> The system tracer is explained in the class comment of class SystemTracer.
> The comment was written by Dan Ingalls (I think), and gives credit to Ted
> Kaehler as the inventor of the original. Class SystemTracer2 has additional
> documentation including how to run the trace. SystemTracer2 is a newer
> version that you will actually be using, so you can think of SystemTracer
> as the original reference implementation, while SystemTracer2 and its
> subclasses are variations on the original. SystemTracer64 is the subclass
> that implements conversion logic for copying 32-bit objects into the
> experimental 64-bit object memory format. This object format is described
> in the SystemTracer64 class comment, and more information is available at
> http://squeakvm.org/squeak64.
> A system tracer will first put your image into a "quiet" mode, then copy
> and convert the running object memory to a new image file, and then wake up
> and return to normal. This is similar to saving your image and restarting
> from a disk file, except that the system tracer will trace your object
> memory to a new format rather than saving it unchanged.
> To trace your running image to a new 64-bit image file, you would do this:
> 	SystemTracer64 writeImage: 'new64bitImage.image'
> The last update I did to SystemTracer (SystemTracing-dtl.23) works with
> closure-enabled images, including Pharo at one time. I have a 64-bit
> Pharo 1.4 image that I made about a year and a half ago. I don't know
> what has changed in Pharo since then, so probably some updates will be
> needed, or possibly a Pharo-specific version. I know that others on the
> Pharo list have worked on this, so hopefully someone else can give you
> some pointers about that.
> Dave

Jannik Laval

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