Current memory usage of process at runtime on Solaris
Is there a way to determine (or even estimate) the memory usage of a process on Solaris from within the running process? I need to write a function to do some memory clean-up to keep my process below a certain threshold when it grows too large.
It seems like Solaris does not support getrusage or any way of querying the system for the current RSS/VSZ (memory usage) like Linux/Windows.
One way to get the information is to read the data from the /proc filesystem. You can get the information you want from /proc/self/psinfo , /proc/self/map , or /proc/self/xmap . See man -s 4 proc .
The /proc/self/psinfo file contains a struct psinfo / psinfo_t as described via procfs.h . The structure contains the size_t pr_size; which contains "the size of the process image in kBytes", and size_t pr_rssize; which contains "resident set size in kBytes".
The /proc/self/map and /proc/self/xmap files contain arrays of struct prmap / prmap_t structures and struct prxmap / prxmap_t structures, respecitively. Both structures contain a size_t pr_size; field defined as "size of mapping in bytes".
Be careful reading /proc - make sure you understand if the data you're trying to read is stored for a 32- or 64-bit process. Offhand, I think everything in Solaris /proc is now 64-bit.