System calls analysys tool

strace -cp 18875

% time     seconds  usecs/call     calls    errors syscall
------ ----------- ----------- --------- --------- ----------------
 77.61    0.019695           0    782458       read
 12.31    0.003123           0      9456        write
  3.60    0.000913           0     47291        fcntl64
  3.32    0.000843           0      9463         open
  1.34    0.000341           0     18920        close
  1.27    0.000323           0     18914        dup2
  0.55    0.000140           0      9457         rt_sigprocmask
  0.00    0.000000           0         6           fstat64
  0.00    0.000000           0        12          getdents64
------ ----------- ----------- --------- --------- ----------------
100.00    0.025378                895977           total

vmstat

Report virtual memory statistics

SYNOPSIS

vmstat [-n] [delay [ count]]
vmstat[-V]

vmstat reports information about processes, memory, paging, block IO, traps, and cpu activity.

The first report produced gives averages since the last reboot. Additional reports give information on a sampling period of length delay. The process and memory reports are instantaneous in either case.

[root@]# vmstat 1
   procs                      memory      swap          io     system      cpu
 r  b  w   swpd   free   buff  cache   si   so    bi    bo   in    cs us sy id
 0  0  0 6085936  91884 1707572 1333604   48   50    70    73   46     7  1  1 23
 0  0  0 6085936  88464 1707608 1335120    0    0  1374    49 2750  1784  0  0 100
 0  0  0 6085936  88048 1707660 1335952    0    0   753   913 2532  1883  0  0 100
 0  0  0 6085936  87632 1707824 1337460    0    0  1282   908 2452  2054  0  0 100