When the application uses malloc() to dynamically allocate memory from the system, the amount of memory that the application consumes cannot decrease while the application is running. The malloc() package contains a memory management system. When the application calls free(), the freed memory is not returned to the operating system but saved for future use by the same process. (Actually, malloc() can be written to return memory to the system, but most malloc() implementations, including Sun's, do not do it that way because it would be hard to do and unnecessary in most cases.)
Therefore, to estimate the amount of memory that the application consumes, it is enough to measure it only once, immediately before the application exits. This will provide the "high-water mark" value. The actual measurement and calculations are performed by the Perl script measure_proe_mem.pl that the library interposer invokes. Listing 2 contains its source.
Perl is a part of Solaris 8 and above, where it is automatically installed in /bin. For the earlier Solaris releases, you can download Perl from a number of locations, including:
http://sunfreeware.com
If Perl is not in /bin on your system, make sure to modify the first line in the script to point to your Perl executable.
The measure_proe_mem.pl script runs the ps(1) command to find all the running processes related to Pro/ENGINEER. It assumes that any process with an executable name containing characters "pro" or "appmgr" qualifies. (These patterns can be easily changed if necessary.)
For each process with a name matching the specified pattern, the script runs the Solaris pmap(1) command with parameter "-x" producing a detailed memory map for the process. After parsing the pmap(1) output, the script adds the amounts of private memory that each process has used, and selects the maximum amount of shared memory among the processes. We do not want to add the shared memory many times since many processes share it. We assume that the Pro/ENGINEER-related processes share most of the same libraries. The resulting value (Max shared + Total private) is a good approximation for the amount of memory this Pro/ENGINEER session has consumed. You can download both source files from the Web:
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