projects / apple / shell_cmds.git / blame
| Commit | Line | Data |
|---|---|---|
| 57cab491 A |
1 | .Dd April 24, 2012\r |
| 2 | .Dt systime 1\r | |
| 3 | .Os Darwin\r | |
| 4 | .Sh NAME\r | |
| 5 | .Nm systime\r | |
| 6 | .Nd gather system-wide time during program execution\r | |
| 7 | .Sh SYNOPSIS\r | |
| 8 | .Nm\r | |
| 9 | .Op Fl P\r | |
| b5fe885e A |
10 | .Op Fl r\r |
| 11 | .Op Fl t Ar sleep_time\r | |
| 57cab491 A |
12 | .Ar utility Op Ar argument ...\r |
| 13 | .Nm\r | |
| 14 | .Fl p\r | |
| b5fe885e A |
15 | .Op Fl r\r |
| 16 | .Op Fl t Ar sleep_time\r | |
| 57cab491 A |
17 | .Nm\r |
| 18 | .Op Fl P\r | |
| 19 | .Fl u Ar user\r | |
| 20 | .Fl s Ar sys\r | |
| 21 | .Fl i Ar idle\r | |
| b5fe885e A |
22 | .Nm\r |
| 23 | .Op Fl P\r | |
| 24 | .Op Fl r\r | |
| 25 | .Op Fl t Ar sleep_time\r | |
| 26 | .Fl T Ar target_pid\r | |
| 57cab491 A |
27 | .Sh DESCRIPTION\r |
| 28 | .Nm\r | |
| 29 | is similar to\r | |
| 30 | .Xr time 1\r | |
| 31 | in that it allows you to execute a utility program. However after execution\r | |
| 32 | completes, it reports the system-wide time that was spent\r | |
| 33 | during that time period, instead of just the portion directly caused\r | |
| 34 | by the utility. This can be used to gather information about CPU\r | |
| 35 | utilization by kernel threads (AIO, networking) and interrupt routines\r | |
| 36 | on behalf of a program, but not directly attributed to it.\r | |
| 37 | .Pp\r | |
| 38 | The\r | |
| 39 | .Nm\r | |
| 40 | program can also be used to snapshot counters with\r | |
| 41 | .Fl p\r | |
| 42 | and then later used with\r | |
| 43 | .Fl u Fl s Fl i\r | |
| 44 | to calculate time spent during a time interval that doesn't correlate\r | |
| 45 | to a specific command execution. For example:\r | |
| 46 | .Pp\r | |
| 47 | .Bd -ragged -offset indent\r | |
| 48 | $ eval `systime -p`\r | |
| 49 | .Pp\r | |
| 50 | $ ... time passes ...\r | |
| 51 | .Pp\r | |
| 52 | $ systime -u $systime_user -s $systime_sys -i $systime_idle\r | |
| 53 | .Pp\r | |
| 54 | 18.79 real 2.03 user 1.04 sys\r | |
| 55 | .Ed\r | |
| 56 | .Pp\r | |
| b5fe885e A |
57 | The\r |
| 58 | .Nm\r | |
| 59 | program can also be used to print the usage of a process with\r | |
| 60 | .Fl T Ar target_pid\r | |
| 61 | , also printing the system wide usage\r | |
| 62 | .Pp\r | |
| 57cab491 A |
63 | .Fl P\r |
| 64 | can be used to print time spent as a percentage of overall CPU capacity\r | |
| 65 | of the system (capped at 100%)\r | |
| b5fe885e A |
66 | .Pp\r |
| 67 | .Fl r\r | |
| 68 | can be used to print the usage iteratively with\r | |
| 69 | .Ar sleep_time\r | |
| 70 | seconds sleep between iterations\r | |
| 71 | .Pp\r | |
| 72 | .Fl t Ar sleep_time\r | |
| 73 | can be used to specify sleep_time between iterations, defaults to 1 second if not specified.\r | |
| 57cab491 A |
74 | .Sh SEE ALSO\r |
| 75 | .Xr time 1 ,\r | |
| 76 | .Xr top 1\r |