Re: Tracing memory allocation

You may try Performance Explorer (PEX).
PEX definition, created with the command below, will trace heap operations:
ADDPEXDFN DFN(<name>) TYPE(*TRACE) JOB(<job specification>) TRCTYPE
(*SLTEVT) SLTEVT(*YES) STGEVT((*ACTGRPHEAP))


    Alexei Pytel




                      "Simon Coulter"
                      <shc@flybynight.c        To:       mi400@midrange.com
                      om.au>                   cc:
                      Sent by:                 Subject:  [MI400] Tracing memory 
allocation
                      mi400-admin@midra
                      nge.com


                      02/11/2002 07:04
                      AM
                      Please respond to
                      mi400






Hello All,

I need to trace what's happening on the heap.  I'm using C functions to
allocate storage and I'm trying to verify that I haven't got any memory
leaks.  Any suggestions?  I'm trying to avoid writing wrappers for
malloc(), realloc(), and free() and tracking this myself.

TRCINT supports a *HEAPMGT option but that is far too low-level (and
system wide).

MI instruction MATHSAT should help but it is broken (see later note).

MI instruction MATRMD option 0x17 is helpful (but this instruction also
has problems -- see later note).

I'm sure IBM have some internal tools for this but what are customers
supposed to do to track/locate/verify memory leaks?  Normally I'm very
careful and allocate and deallocate storage in the same function or
require my caller to allocate storage.  In this case it is messier and I
don't have much control over that (long story ...) so how do I know I'm
not leaking?

Regards,
Simon Coulter.

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