From: Martin Jambon <m.jambon@ibcp.fr>
To: <caml-list@inria.fr>
Subject: [Caml-list] Memory leak
Date: Mon, 15 Apr 2002 21:24:15 +0200 (CEST) [thread overview]
Message-ID: <Pine.LNX.4.33L2.0204151905050.5606-100000@pc-bioinfo1.ibcp.fr> (raw)
Hello,
Is it possible that non-negligible amounts of unreachable data are never
freed by the GC?
My program seems to waste memory, even with Gc.max_overhead set to 50 (or
even 0).
What should I do?
The program is written only in OCaml.
It has been tested using version 3.04 and last friday's working version
(3.04+9 (2002-04-04)).
No dangerous feature of the language is used except Marshal, I think.
The program may sequentially handle several gigabytes of marshaled data,
but doesn't crash and always produces correct results.
Example of Gc.stat (OCaml 3.04):
minor_words: 1746668652
promoted_words: 104792423
major_words: 232260045
minor_collections: 121
major_collections: 75727
heap_words: 250683392 (* bytes *)
heap_chunks: 941
live_words: 28221788
live_blocks: 4657360
free_words: 34443371
free_blocks: 772158
largest_free: 21914
fragments: 5689
compactions: 11
In this case, the size of the heap should stay below 10 MB. Here, it is
250 MB.
Removal of some parts of the program doesn't produce expected results
[...].
Comments in module Gc say [about Gc.finalise]:
Some constant values can be heap-allocated but never deallocated
during the lifetime of the program, for example a list of integer
constants; this is also implementation-dependent.
How do I know if my program uses such permanent data?
Should I use Gc.finalise to look for missing deallocations?
Hoping I will get some help...
Thanks in advance,
Martin
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next reply other threads:[~2002-04-15 19:38 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-04-15 19:24 Martin Jambon [this message]
2002-04-16 13:22 ` Brian Rogoff
2002-04-16 22:41 ` Scott Cyphers
2002-04-17 9:22 ` Markus Mottl
2002-04-17 14:53 ` Brian Rogoff
2002-04-16 16:52 ` Martin Jambon
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