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

# hotspot.d(1m)

print disk event by location. Uses DTrace.

## NAME

hotspot.d - print disk event by location. Uses DTrace.

## SYNOPSIS

**hotspot.d**

## DESCRIPTION

hotspot.d is a simple DTrace script to determine if disk activity is  occuring in the one place - a "hotspot". This helps us understand the  system's usage of a disk, it does not imply that the existance or not  of a hotspot is good or bad (often may be good, less seeking).

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

## EXAMPLES

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

  \#  **hotspot.d**

## FIELDS

- Disk

  disk instance name

- Major

  driver major number

- Minor

  driver minor number

- value

  location of disk event, megabytes

- count

  number of events

## 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

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

## AUTHOR

Brendan Gregg \[Sydney, Australia\]

## SEE ALSO

dtrace(1M)