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Bug 181194 - Speed-up computation of retained sizes
Speed-up computation of retained sizes
Product: profiler
Classification: Unclassified
Component: Base
All All
: P2 (vote)
: 7.2
Assigned To: Tomas Hurka
Depends on: 207728
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Reported: 2010-02-25 05:45 UTC by Egor Ushakov
Modified: 2012-09-27 15:08 UTC (History)
0 users

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Description Egor Ushakov 2010-02-25 05:45:05 UTC
Process of computing retained sizes takes very long time and it is serial (uses only one core of my 4 core cpu), can that be performed in parallel and so faster?
Comment 1 Egor Ushakov 2010-02-25 06:24:01 UTC
Still analyzing crash dump.
So far I can see lots of StreamTerm.OutputMonitor threads alive...
Comment 2 Tomas Hurka 2010-02-25 06:38:37 UTC
I am not sure if this is possible. It will be better to improve the algorithm. Note that GC can run in parallel with the computation.
Comment 3 Egor Ushakov 2010-02-25 06:46:54 UTC
please do not pay attention to the comment about crash dump - wrong IZ, sorry
Comment 4 Tomas Hurka 2010-02-25 07:01:08 UTC
I did not. I already thought that this comment was attached to wrong IZ.
Comment 5 Jiri Sedlacek 2012-01-23 11:13:16 UTC
From the related bugdb:

"Open uploaded hprof 
Click Find button, to see the top retained objects 
Bug: Takes 15 mins"


"I'm using my 64bit Linux box. I have not changed the memory IDE uses.

I can open the same file on Windows in YourKit in 1m30s, Initializing Statics
takes 16s. Click calculating exact retained size for the top 10 takes 10s.

In addition to this it's 15 mins every time I want to look at the dump."
Comment 6 Tomas Hurka 2012-02-23 12:48:33 UTC
changeset:   213536:66c61c15f53c
user:        Tomas Hurka <>
date:        Thu Feb 23 13:42:00 2012 +0100
summary:     issue #181194, improve efficiency of dirtySet cache

changeset:   213535:61322416909d
user:        Tomas Hurka <>
date:        Thu Feb 23 13:39:51 2012 +0100
summary:     issue #181194, memory map NumberList data, once they will not grow too much

The above fixes improved retained size computation (including references and GC roots) on tested heap dump from 717 seconds to 232 seconds.
Comment 7 Quality Engineering 2012-02-28 10:51:30 UTC
Integrated into 'main-golden', will be available in build *201202280400* on (upload may still be in progress)
User: Tomas Hurka <>
Log: issue #181194, memory map NumberList data, once they will not grow too much
Comment 8 Tomas Hurka 2012-03-19 13:33:29 UTC
Done for 7.2.

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