logmem $(pidof foo) $(pidof bar) > memstats Run these script for the duration of your test, passing the set of processes ids that you'd like to monitor and redirecting its output to a log file./logcpu $(pidof foo) $(pidof bar) > cpustats Memory is a bit easier as we directly obtain the instantaneous values. During each poll interval, write all results on a single line to stdout.įor memory stats, write a similar script, but simply log the per-process memory usage. At a fixed interval (ex: 1 second) poll / calculate the cumulative totals for each process and the system as a whole. With that in mind, I'll focus on the high-level strategy.įor CPU stats, use your favorite scripting language to create an executable that takes a set of process ids for monitoring. If you google a bit you'll find plenty of detailed info on these files, and pointers to libraries / apps / code snippets that can help you obtain / derive the values you need. For each process, the file /proc/$PID/stat (Table 1-4 in proc.txt) will provide you with both process-specific cpu usage stats and memory usage stats (see rss). The first line of /proc/stat (Section 1.8 in proc.txt) will give you cumulative cpu usage stats (i.e. Take a look at the kernel documentation for the proc filesystem (Google 'linux proc.txt').
I typically throw together a simple script for this type of work.
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