iofile.d(1m) USER COMMANDS iofile.d(1m)NAME
iofile.d - I/O wait time by file and process. Uses DTrace.
SYNOPSIS
iofile.d
DESCRIPTION
This prints the total I/O wait times for each filename by process. This can help determine why an application is performing poorly by
identifying which file they are waiting on, and the total times. Both disk and NFS I/O are measured.
Since this uses DTrace, only users with root privileges can run this command.
EXAMPLES
Sample until Ctrl-C is hit then print report,
# iofile.d
FIELDS
PID process ID
CMD process name
TIME total wait time for disk events, us
FILE file pathname
BASED ON
/usr/demo/dtrace/iocpu.d
DOCUMENTATION
See the DTraceToolkit for further documentation under the Docs directory. The DTraceToolkit docs may include full worked examples with ver-
bose descriptions explaining the output.
EXIT
iofile.d will sample until Ctrl-C is hit.
SEE ALSO iosnoop(1M), dtrace(1M)version 0.70 Jul 24, 2005 iofile.d(1m)
Check Out this Related Man Page
pridist.d(1m) USER COMMANDS pridist.d(1m)NAME
pridist.d - process priority distribution. Uses DTrace.
SYNOPSIS
pridist.d
DESCRIPTION
This is a simple DTrace script that samples at 1000 Hz which process is on the CPUs, and what the priority is. A distribution plot is
printed.
With priorities, the higher the priority the better chance the process (actually, thread) has of being scheduled.
This idea came from the script /usr/demo/dtrace/profpri.d, which produces similar output for one particular PID.
Since this uses DTrace, only users with root privileges can run this command.
EXAMPLES
This samples until Ctrl-C is hit.
# pridist.d
FIELDS
CMD process name
PID process ID
value process priority
count number of samples of at least this priority
BASED ON
/usr/demo/dtrace/profpri.d
DOCUMENTATION
DTrace Guide "profile Provider" chapter (docs.sun.com)
See the DTraceToolkit for further documentation under the Docs directory. The DTraceToolkit docs may include full worked examples with ver-
bose descriptions explaining the output.
EXIT
pridist.d will sample until Ctrl-C is hit.
SEE ALSO dispadmin(1M), dtrace(1M)version 0.90 Jun 13, 2005 pridist.d(1m)
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