---
name: "rwbypid.d"
section: "1m"
platform: "macos"
package: "dtrace"
version: "413"
release: "macOS 26.5"
platforms: ["macos"]
url: "https://new.carta.tech/rwbypid.d"
---

# rwbypid.d(1m)

read/write calls by PID. Uses DTrace.

## NAME

rwbypid.d - read/write calls by PID. Uses DTrace.

## SYNOPSIS

**rwbypid.d**

## DESCRIPTION

This script tracks the number of reads and writes at the syscall level by processes, printing the totals in a report. This matches reads and writes whether they succeed or not.

Since this uses DTrace, only users with root privileges can run this command.

## EXAMPLES

- This samples until Ctrl-C is hit.

  \#  **rwbypid.d**

## FIELDS

- PID

  process ID

- CMD

  process name

- DIR

  direction, Read or Write

- COUNT

  total calls

## DOCUMENTATION

See the DTraceToolkit for further documentation under the  Docs directory. The DTraceToolkit docs may include full worked examples with verbose descriptions explaining the output.

## EXIT

rwbypid.d will sample until Ctrl-C is hit.

## AUTHOR

Brendan Gregg \[Sydney, Australia\]

## SEE ALSO

rwbbypid.d(1M), dtrace(1M)