How to determine CPU and memory consumption from inside a process?

Question

I once had the task of determining the following performance parameters from inside a running application:

• Total virtual memory available
• Virtual memo

Answer 1

For Linux You can also use /proc/self/statm to get a single line of numbers containing key process memory information which is a faster thing to process than going through a long list of reported information as you get from proc/self/status

See http://man7.org/linux/man-pages/man5/proc.5.html

   /proc/[pid]/statm
          Provides information about memory usage, measured in pages.
          The columns are:

              size       (1) total program size
                         (same as VmSize in /proc/[pid]/status)
              resident   (2) resident set size
                         (same as VmRSS in /proc/[pid]/status)
              shared     (3) number of resident shared pages (i.e., backed by a file)
                         (same as RssFile+RssShmem in /proc/[pid]/status)
              text       (4) text (code)
              lib        (5) library (unused since Linux 2.6; always 0)
              data       (6) data + stack
              dt         (7) dirty pages (unused since Linux 2.6; always 0)