Засекаем время выполнения команды/скрипта в Linux

Категория: Linux

Замеряем длительность выполнения и расход ресурсов (память, проц) запущенной команды или скрипта с помощью замечательной Unix-утилиты - time.

Примеры использования

Например, засекаем время выгрузки дампа БД:

time mysql -uroot -p database < database.sql

Форматируем вывод нагрузки на проц и расход памяти:

/usr/bin/time -f '(%e %P %M)' php script.php
/usr/bin/time -f '%em %Pcpu %Mkb' php script.php

Форматирование вывода

The resource specifiers, which are a superset of those recognized by the tcsh(1) builtin `time' command, are:
%      A literal `%'.
C      Name and command line arguments of the command being timed.
D      Average size of the process's unshared data area, in Kilobytes
E      Elapsed real (wall clock) time used by the process, in [H:]M:S.mcsec
F      Number of major, or I/O-requiring, page faults that occurred while the process was running.  These are faults where the
     page has actually migrated out of primary memory.
I      Number of file system inputs by the process.
K      Average total (data+stack+text) memory use of the process, in Kilobytes.
M      Maximum resident set size of the process during its lifetime, in Kilobytes.
O      Number of file system outputs by the process.
P      Percentage of the CPU that this job got.  This is just user + system times divided by the total running time.  It also
     prints a percentage sign.
R      Number of minor, or recoverable, page faults.  These are pages that are not valid (so they fault) but which have not yet
     been claimed by other virtual pages.  Thus the data in the page is still valid but the system tables must be updated.
S      Total number of CPU-seconds used by the system on behalf of the process (in kernel mode), in seconds.
U      Total number of CPU-seconds that the process used directly (in user mode), in seconds.
W      Number of times the process was swapped out of main memory.
X      Average amount of shared text in the process, in Kilobytes.
Z      System's page size, in bytes.  This is a per-system constant, but varies between systems.
c   Number of times the process was context-switched involuntarily (because the time slice expired).
e   Фактическое время выполнения процесса в сек.
k   Number of signals delivered to the process.
p      Average unshared stack size of the process, in Kilobytes.
r      Number of socket messages received by the process.
s      Number of socket messages sent by the process.
t      Average resident set size of the process, in Kilobytes.
w      Number of times that the program was context-switched voluntarily, for instance while waiting for an I/O operation to
     complete.
x      Exit status of the command.

#time, #memory usage, #cpu usage, #benchmark

категория: Linux