NAME
bw - command used to measure system-wide bandwidth consump-
tion
SYNOPSIS
bw args app params
DESCRIPTION
The bw command measures system-wide bandwidth consumption
over the entire run of an application. If the application is
the only load on the system, then all the bandwidth can be
attributed to that one application. If there are multiple
applications running on the system, then it is not possible
to attribute bandwidth to a specific one of them.
The bw command is a wrapper for cpustat measuring activity
on the memory controller counters. Hence bw must be run with
the necessary privileges to access the performance counters
on a system wide basis.
OPTIONS
The following options are supported:
-g file
If gnuplot is available on the path, then produce a
graph showing the bandwidth consumption over the entire
run of the application.
-h Print help information
-o file
Output the results of the script to the given file,
rather than to stdout.
-V Print version information
-v Generate debug output
The output from the script will show system-wide read,
write, and total bandwidth consumption over the run of the
application. The results are in MB/s.
SEE ALSO
analyzer(1), collect(1), er_archive(1), er_cp(1),
er_export(1), er_mv(1), er_print(1), er_rm(1), er_src(1),
and the Performance Analyzer manual.