Hi Roy, Download link works for me: http://public.dhe.ibm.com/software/websphere/appserv/support/tools/HeapAnalyzer/ha456.jar
--
Kevin Grigorenko
IBM WebSphere Application Server SWATRoy Zhang --- [EXTERNAL] Re: [mat-dev] How can we open huge heap dump having more than 2, 147, 483, 639 objects ---
Thanks Kevin for ur kindly advice! Unfortunately download link in that page doesn't work.
Hi Roy,
Before IBM switched
its focus to MAT, an IBMer built another (free) heapdump analyzer tool
which you can also try: https://www.ibm.com/developerworks/community/groups/service/html/communityview?lang=ja&communityUuid=4544bafe-c7a2-455f-9d43-eb866ea60091
If it works, be
careful of its "size" calculations (the number in brackets to
the left of each object) and its leak suspects report because as far as
I know they're built by heuristics more than a formal digraph and retained
heap analysis.
--
Kevin Grigorenko
IBM WebSphere Application Server SWAT
From:
Roy
Zhang <roy.sunny.zhang007@xxxxxxxxx>
To:
Memory
Analyzer Dev list <mat-dev@xxxxxxxxxxx>
Date:
09/20/2019
02:28 AM
Subject:
[EXTERNAL]
Re: [mat-dev] How can we open huge heap dump having more than 2, 147, 483,
639 objects
Sent
by: mat-dev-bounces@xxxxxxxxxxx
Thanks Andrew for ur quick feedback!
I tried jprofiler and yourkit profiler,
it throws the same error message as Eclipse MAT.
Regarding netbean profiler, it throws
an strange message "an attempt was made to move the file pointer before
the beginning of the file", I don't know the reason.
I happen to find one expert can open
150G heap (http://blog.ragozin.info/2015/02/programatic-heapdump-analysis.html,
github: https://github.com/aragozin/jvm-tools/tree/master/hprof-heap),
limitation is Only forward reference traversing, I will give it a
shot.
>>>How
many people hit the 2^31 object limit? Would 2^32 objects be enough or
does it need to be more?
For my case, 91G
heap have 3 billion object (shown by Yourkit profiler), 2^32
objects is enough for me.
>>>Raising
the MAT object limit sounds a big project - my first guess before even
designing an approach would be 3 months of developers time, and unfortunately
my day job is not working on MAT
I am interested
in fixing it. If you could provide details, I am glad to contribute my
effort to MAT :)
Thanks,
Roy
On Fri, Sep 20, 2019 at 3:49 PM Andrew
Johnson <andrew_johnson@xxxxxxxxxx>
wrote:
Roy,
We have not done any work on increasing the limit on the number of objects
MAT can handle. We do not have a workaround either. I don't know what the
limits are for other memory analysis programs.
It might be possible to write a utility which reads a HPROF file, discards
some objects and writes the remainder to a new file, but the result would
be misleading unless there was some clever processing to decide which
objects to discard. There is HPROF reading and writing code in the org.eclipse.mat.hprof
plugin which might help writing such a utility.
Raising the MAT object limit sounds a big project - my first guess before
even designing an approach would be 3 months of developers time, and unfortunately
my day job is not working on MAT. When I've finished on integrating parallel
parsing improvements (bug 272324) I'll think about it some more,
but I don't see myself having the time to implement it. How many people
hit the 2^31 object limit? Would 2^32 objects be enough or does it need
to be more?
Andrew
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