---
name: "otfmerge"
section: "1"
platform: "linux"
package: "otf-trace"
version: "1.12.5+dfsg-8+b5"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/otfmerge"
---

# otfmerge(1)

Change the number of streams for an OTF trace

## NAME

otfmerge - Change the number of streams for an OTF trace

## DESCRIPTION

-

  otfmerge - Change the number of streams for an existing OTF trace.

-

  Syntax: otfmerge \[options\] \<input file name\>

-

  options:

- **-h**, **--help**

  show this help message

- **-V**

  show OTF version

- **-p**

  show progress

- **-n** \<n\>

  set number of streams for output set this to 0 for using one stream per process (default: 1)

- **-f** \<n\>

  max. number of filehandles available per rank

- **-o** \<name\>

  namestub of the output file (default: out)

- **-rb** \<size\>

  set buffersize of the reader (for each rank)

- **-wb** \<size\>

  set buffersize of the writer (for each rank)

- **-z** \<zlevel\>

  write compressed output zlevel reaches from 0 to 9 where 0 is no compression and 9 is the highest level

- **--stats**

  cover statistics too

- **--snaps**

  cover snapshots too

- **--long**

  write long OTF format