OpenGrok

rwtop - display top read/write bytes process. Uses DTrace. rwtop [-Cc] [-j|-Z] [-n name] [-p PID] [-t top] [interval [count]] This is measuring reads and writes at the application level. This matches read and write system calls. Since this uses DTrace, only the root user or users with the dtrace_kernel privilege can run this command. Solaris stable - needs the sysinfo provider.

-C don't clear the screen

-c print counts

-j print project ID

-Z print zone ID

-n name process name to track

-p PID PID to track

-t top print top number only

Default output, print summary every 5 seconds # rwtop

One second samples, # rwtop 1

Print top 10 lines only, # rwtop -t 10

Monitor processes named "bash", # rwtop -n bash

Print 12 x 5 second samples, scrolling, # rwtop -C 5 12

PROJ project ID

ZONE zone ID

UID user ID

PID process ID

PPID parent process ID

CMD command name for the process

D direction, Read or Write

BYTES total bytes during sample

load 1 minute load average

app_r total read Kb for sample

app_w total write Kb for sample

See the DTraceToolkit for further documentation under the Docs directory. The DTraceToolkit docs may include full worked examples with verbose descriptions explaining the output. rwtop will run forever until Ctrl-C is hit, or the specified interval is reached. Brendan Gregg [Sydney, Australia] iotop(1M), dtrace(1M)

Indexes created Wed Apr 29 00:23:26 UTC 2026