_memory_profile - It shows the amount of memory used by every pacakge.
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   _memory_profile [-f <filename>] [-h] [-p] [-u <units>]

   This  command  intregrates  the output from purify with a function map
   generated by a perlscript plus another perlscript to generate a memory
   profile of vis.

   This command relies on the output of purify to a file to call the script
   "memoryaccount" and produce a summary of how much memory has been allocated
   by each package. Although this command may appear simple it requires the
   interaction of two scripts and three files, so special care should be taken
   when attempting to modify it.

   Here is the way it works. The code in this command is conditionally compiled
   depending on the definition of the symbol PURIFY. If the symbol is not
   defined, the program prints a message notifying that the command is not
   operative in this executable. If PURIFY has been defined, there are certain
   things that are assumed. The executable has been linked with purify. The
   output of purify is being redirected to a file with name purify.log. The
   perl script memoryaccount is in $VIS/common/share and it is executable.
   There exists a file mapping function names to packages in the same place
   whose name is .fmap.

   The command then calls purify_all_inuse() to force purify to dump to the
   file purify.log the information about the memory that is currently visible
   to the program. This memory is not the total memory allocated by the program
   since there may be leaked memory that is no longer accessible. A temporary
   file is created and the script memoryaccount is called to analyze the file
   purify.log and write in the temporary file the memory profile obtained from
   it. Once the script is done, the temporary file is dumped to vis_stdout and
   deleted.

   Since most of the computation in this command is done by the pearlscript
   memoryaccount, for more information please refer to the message printed when
   the script is invoked with the option -h. Command options:

   -f <filename>
          File to read the dump from. The default is purify.log. This option
          should be used if and only if the option -log-file has been used at
          the linking stage when building the executable.

   -h
          Print the command usage.

   -p
          Print also the packages that did not allocated any visible memory

   -u <units>
          Units to print the memory usage in. It may be "b" for bytes, "k" for
          kilobytes, "m" for megabytes and "g" for gigabytes. The default is
          bytes.
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   Last updated on 20100410 00h02