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author | 2021-05-09 14:20:58 -0400 | |
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committer | 2021-05-09 14:20:58 -0400 | |
commit | 5fd83771641d15c418f747bd343ba6738d3875f7 (patch) | |
tree | 5abf0f78f680d9837dbd93d4d4c3933bb7509599 /shell_cmds/systime/systime.1 | |
download | apple_cmds-5fd83771641d15c418f747bd343ba6738d3875f7.tar.gz apple_cmds-5fd83771641d15c418f747bd343ba6738d3875f7.tar.zst apple_cmds-5fd83771641d15c418f747bd343ba6738d3875f7.zip |
Import macOS userland
adv_cmds-176
basic_cmds-55
bootstrap_cmds-116.100.1
developer_cmds-66
diskdev_cmds-667.40.1
doc_cmds-53.60.1
file_cmds-321.40.3
mail_cmds-35
misc_cmds-34
network_cmds-606.40.1
patch_cmds-17
remote_cmds-63
shell_cmds-216.60.1
system_cmds-880.60.2
text_cmds-106
Diffstat (limited to 'shell_cmds/systime/systime.1')
-rw-r--r-- | shell_cmds/systime/systime.1 | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/shell_cmds/systime/systime.1 b/shell_cmds/systime/systime.1 new file mode 100644 index 0000000..ce296b6 --- /dev/null +++ b/shell_cmds/systime/systime.1 @@ -0,0 +1,76 @@ +.Dd April 24, 2012
+.Dt systime 1
+.Os Darwin
+.Sh NAME
+.Nm systime
+.Nd gather system-wide time during program execution
+.Sh SYNOPSIS
+.Nm
+.Op Fl P
+.Op Fl r
+.Op Fl t Ar sleep_time
+.Ar utility Op Ar argument ...
+.Nm
+.Fl p
+.Op Fl r
+.Op Fl t Ar sleep_time
+.Nm
+.Op Fl P
+.Fl u Ar user
+.Fl s Ar sys
+.Fl i Ar idle
+.Nm
+.Op Fl P
+.Op Fl r
+.Op Fl t Ar sleep_time
+.Fl T Ar target_pid
+.Sh DESCRIPTION
+.Nm
+is similar to
+.Xr time 1
+in that it allows you to execute a utility program. However after execution
+completes, it reports the system-wide time that was spent
+during that time period, instead of just the portion directly caused
+by the utility. This can be used to gather information about CPU
+utilization by kernel threads (AIO, networking) and interrupt routines
+on behalf of a program, but not directly attributed to it.
+.Pp
+The
+.Nm
+program can also be used to snapshot counters with
+.Fl p
+and then later used with
+.Fl u Fl s Fl i
+to calculate time spent during a time interval that doesn't correlate
+to a specific command execution. For example:
+.Pp
+.Bd -ragged -offset indent
+$ eval `systime -p`
+.Pp
+$ ... time passes ...
+.Pp
+$ systime -u $systime_user -s $systime_sys -i $systime_idle
+.Pp
+18.79 real 2.03 user 1.04 sys
+.Ed
+.Pp
+The
+.Nm
+program can also be used to print the usage of a process with
+.Fl T Ar target_pid
+, also printing the system wide usage
+.Pp
+.Fl P
+can be used to print time spent as a percentage of overall CPU capacity
+of the system (capped at 100%)
+.Pp
+.Fl r
+can be used to print the usage iteratively with
+.Ar sleep_time
+seconds sleep between iterations
+.Pp
+.Fl t Ar sleep_time
+can be used to specify sleep_time between iterations, defaults to 1 second if not specified.
+.Sh SEE ALSO
+.Xr time 1 ,
+.Xr top 1
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