Text-based interactive GHC .prof viewer

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LTS Haskell 9.1:
Stackage Nightly 2017-08-17:
Latest on Hackage:
BSD3 licensed by Mitsutoshi Aoe
Maintained by Mitsutoshi Aoe

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viewprof is a text-based interactive GHC .prof viewer.


It has three display modes:

  • Aggregate cost centers view: This is the default view. It groups cost centers by their name and module name, like the middle section of .prof files.
  • Call sites view: If you press enter on a cost center, viewprof displays call sites of the cost center you selected. This view tells how much the cost center spent for each call site.
  • Modules view: If you press M, viewprof displays the module level breakdown. This view tells coarse overview of cost attribution.


stack install viewprof

On Windows


How to install and launch

git clone
cd viewprof/docker
docker-machine start
docker build -t viewprof .
.\viewprof.bat path/to/


| keys | action | |-------------------|---------------------------------------------| | q or escape | quit the current view | | j or | move focus down          | | k or | move focus up         | | gg | move focus to the top | | G | move focus to the bottom | | C | display aggregate cost center view | | M | switch to module breakdown | | enter | select a cost center and display call sites | | t | sort by time | | a | sort by allocation | | e | sort by # of entries | | h or ? | show key bindings | | i | show profile information |


viewprof was originally meant to be a Haskell port of mkotha/viewprof, which is a text-based .prof viewer written in Common Lisp.


Revision history for viewprof - 2017-08-09

  • Relax upper version bound for vty and brick - 2017-07-31

  • Relax upper version bound for base - 2017-07-21

  • Relax upper version bound for vty - 2017-07-10

  • Relax upper version bound for brick
  • Add Docker support on Windows - 2017-06-28

  • Relax upper version bound for brick - 2017-06-12

  • Relax upper version bound for brick - 2017-02-14

  • Update ghc-prof to 1.4.0 - 2017-01-25

  • Relax upper version bounds for vty and brick

0.0.0 - 2017-01-20

  • Initial release
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