Re: [mat-dev] How can we open huge heap dump having more than 2, 147, 48

[Andrew Johnson <andrew_johnson@xxxxxxxxxx>]

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

Unless stated otherwise above:
IBM United Kingdom Limited - Registered in England and Wales with number
741598. 
Registered office: PO Box 41, North Harbour, Portsmouth, Hampshire PO6
3AU