Re: [platform-core-dev] RE: core.resources Performance Test question

[Boris Bokowski <bokowski@xxxxxxxxx>]

Binary search for required heap size? Interesting idea, I think it's
worth a try. Though I wonder how stable the results would be...

Boris



On 2009-10-16, at 17:44, "Oberhuber, Martin" <Martin.Oberhuber@xxxxxxxxxxxxx
 > wrote:

> Hi again,
>
> I thought a bit more about this, and I am afraid that the way
> the test (WorkspacePerformanceTest#testRefreshProject())
> is written today, the heap size data will not at all
> help me.
>
> Right now, heap size is measured after the test completes;
> but in my case (Refresh resources), memory consumption is
> temporary during the algorithm. In other words, the algorithm
> needs a lot of memory, but once the computation is done the
> memory is returned for garbage collection so the value after
> the test is not interesting.
>
> I assume that there are many other similar cases, so perhaps
> somebody has an idea for how to measure memory consumption in
> this situation?
>
> Right now, my feeling ist that the only reliable and realistic
> way to measure memory consumption is running the test in a
> separate VM process with varying memory limits set by -Xmx
> vm argument, until the test runs into an OutOfMemoryException.
> This seems to be the only way how garbage collection can be
> taken into account, coming up with a value that matters for
> end users.
>
> Has anybody tried this before? Or how else could I get
> realistic data for memory consumption?
>
>
> Cheers,
> --
> Martin Oberhuber, Senior Member of Technical Staff, Wind River
> Target Management Project Lead, DSDP PMC Member
> http://www.eclipse.org/dsdp/tm
>
>
>
>> -----Original Message-----
>> From: platform-core-dev-bounces@xxxxxxxxxxx
>> [mailto:platform-core-dev-bounces@xxxxxxxxxxx] On Behalf Of
>> Oberhuber, Martin
>> Sent: Friday, October 16, 2009 5:33 PM
>> To: Frederic Fusier
>> Cc: Eclipse Platform Core component developers list.; John
>> Arthorne; Boris Bokowski
>> Subject: [platform-core-dev] RE: core.resources Performance
>> Test question
>>
>> Hi Frederic,
>>
>>> BTW, I had a look on my tool and saw that it was not too
>>> costly to finalize the implementation to display a new number
>>
>> that is great! - But I don't think I'll need the pages for the
>> latest I-build since I'll want to compare an upcoming N-build
>> or I-build on the official performance machines against the
>> baseline anyways. So it'll be sufficient if that upcoming
>> N-build or I-build has the new number (heapsize) displayed
>> for both the new build and the previous baseline.
>>
>>> Would it be possible to open a bug for this against
>>> Platform/Releng in order to track the work around this?
>>
>> You are welcome:
>> https://bugs.eclipse.org/bugs/show_bug.cgi?id=292545
>>
>> Cheers,
>> --
>> Martin Oberhuber, Senior Member of Technical Staff, Wind River
>> Target Management Project Lead, DSDP PMC Member
>> http://www.eclipse.org/dsdp/tm
> _______________________________________________
> platform-core-dev mailing list
> platform-core-dev@xxxxxxxxxxx
> https://dev.eclipse.org/mailman/listinfo/platform-core-dev