---
name: "perf_3.2-diff"
section: "1"
platform: "linux"
package: "linux-tools-3.2"
version: "3.2.17-1"
release: "Debian 7 (Wheezy)"
platforms: ["linux"]
url: "https://new.carta.tech/perf_3.2-diff"
---

# perf\_3.2-diff(1)

Read two perf.data files and display the differential profile

## NAME

perf-diff - Read two perf.data files and display the differential profile

## SYNOPSIS

```
perf diff [oldfile] [newfile]
```

## DESCRIPTION

This command displays the performance difference amongst two perf.data files captured via perf record.

If no parameters are passed it will assume perf.data.old and perf.data.

## OPTIONS

- \-M, --displacement

  Show position displacement relative to baseline.

- \-D, --dump-raw-trace

  Dump raw trace in ASCII.

- \-m, --modules

  Load module symbols. WARNING: use only with -k and LIVE kernel

\-d, --dsos=

Only consider symbols in these dsos. CSV that understands **file://filename** entries.

\-C, --comms=

Only consider symbols in these comms. CSV that understands **file://filename** entries.

\-S, --symbols=

Only consider these symbols. CSV that understands **file://filename** entries.

\-s, --sort=

Sort by key(s): pid, comm, dso, symbol.

\-t, --field-separator=

Use a special separator character and don’t pad with spaces, replacing all occurrences of this separator in symbol names (and other output) with a *.* character, that thus it’s the only non valid separator.

- \-v, --verbose

  Be verbose, for instance, show the raw counts in addition to the diff.

- \-f, --force

  Don’t complain, do it.

- \--symfs=\<directory\>

  Look for files with symbols relative to this directory.

## SEE ALSO

[**perf\_3.2-record**(1)](/perf_3.2-record/1.md)