[[Lots of stuff to explain.]]

Doug Lea's dlmalloc page, which is very interesting, is at:
   http://g.oswego.edu/dl/html/malloc.html

''libdlmalloc'' is the default memory allocator for most Linux
distributions at this time.

----
[Phil Ehrens] makes available at
http://www.imbe.net/dlmalloc_tcl.tar.bz2
"a thread safe version of dlmalloc which also exposes a
couple of useful functions at the tcl layer so you can watch it
work".  http://starbase.neosoft.com/~claird/comp.lang.tcl/binaries/dlmalloc_tcl.tar.bz2
mirrors it.

'''PSE-''' This library is being used to handle the memory allocation on all
of our Solaris systems (up to 8 cpu's) and is stable and works
exactly as advertised.

All of our production Linux systems are, for better or worse,
running RedHat 7.1, and this distro uses it's own thread-patched
version of libdlmalloc for ALL memory alocation.
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Tcl itself provides memory introspection through the [memory] command. This command will be enabled only if Tcl was compiled with the MEM_DEBUG preprocessor flag defined (-DMEM_DEBUG).

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A commercial tool for memory introspection and checking is Purify:

  http://www.rational.com/products/purify_unix/index.jsp
  http://www.rational.com/products/purify_nt/index.jsp

'''Purify does not and never will support GCC'''

A commercial tool for memory introspection and checking
'''that DOES support gcc''', and works very well, is ''Insure'':

  http://www.parasoft.com/products/insure/index.htm
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An open source memory checker: Electric Fence 
   http://freshmeat.net/projects/efence