bw(1)

Name

bw - command used to measure system-wide bandwidth consumption

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.

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)

Performance Analyzer manual