Measuring Memory Used by Application
Knowing how much memory an application session has consumed can be useful in many ways. It can help you determine whether adding more RAM will help performance, or the amount of available physical memory can be decreased without a negative effect on performance. It can be useful for workload management tasks required for distributed computing. You can also use this information to detect abnormal situations, for example, when the application is consuming too much memory.
This task is generally not trivial since today's operating systems, including Solaris, are very complex. The naive methods frequently used for this purpose do not work well. Examples include ps(1), swap(1), and vmstat(1) commands. For various reasons, none of those commands report the total memory consumption of a particular application. For example, the ps(1) SZ (size) field will report the amount of virtual memory, but not the actual memory consumed. The RSS (resident set size) field will include the memory occupied by the shared libraries, which many processes can use simultaneously.
It is not impossible however. Solaris has a very useful pmap(1) command based on the proc(4) interface. Here is a description of a couple of tools based on pmap(1) technology, which you can use with most applications, not just Pro/ENGINEER.
The readers who are not programmatically inclined can skip all the details given here, download the tools, and simply use them. These tools, with the exception of pmap(1), are not officially supported by Sun Microsystems. They are informal example programs and anyone is welcome to use them or modify them. They also demonstrate a few useful programming techniques.
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