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

# seeksize.d(1m)

print disk event seek report. Uses DTrace.

## NAME

seeksize.d - print disk event seek report. Uses DTrace.

## SYNOPSIS

**seeksize.d**

## DESCRIPTION

seeksize.d is a simple DTrace program to print a report of disk event seeks by process.

This can be used to identify whether processes are accessing the disks in a "random" or "sequential" manner. Sequential is often desirable, indicated by mostly zero length seeks.

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

## EXAMPLES

- Sample until Ctrl-C is hit then print report,

  \#  **seeksize.d**

## FIELDS

- PID

  process ID

- CMD

  command and argument list

- value

  distance in disk blocks (sectors)

- count

  number of I/O operations

## 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

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

## AUTHOR

Brendan Gregg \[Sydney, Australia\]

## SEE ALSO

iosnoop(1M), bitesize.d(1M), dtrace(1M)