threadscope: A graphical tool for profiling parallel Haskell programs.

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ThreadScope is a graphical viewer for thread profile information generated by the Glasgow Haskell compiler (GHC).

The Threadscope program allows us to debug the parallel performance of Haskell programs. Using Threadscope we can check to see that work is well balanced across the available processors and spot performance issues relating to garbage collection or poor load balancing.

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Versions 0.1, 0.1.1, 0.1.2, 0.1.3, 0.2.0, 0.2.1, 0.2.2, 0.2.3, 0.2.4, 0.2.5, 0.2.6, 0.2.7, 0.2.8, 0.2.9, 0.2.10, 0.2.11,, 0.2.12, 0.2.12, 0.2.13, 0.2.14,
Change log None available
Dependencies array (<0.6), base (>=4.10 && <5), binary (<0.11), bytestring (<0.11), cairo (<0.14), containers (>=0.2 && <0.7), deepseq (>=1.1), file-embed (<0.1), filepath (<1.5), ghc-events (>=0.5 && <0.13), glib (<0.14), gtk (>=0.12 && <0.16), mtl (<2.3), pango (<0.14), template-haskell (<2.16), temporary (>=1.1 && <1.4), text (<1.3), time (>=1.1 && <1.10), unix (>=2.3 && <2.8) [details]
License BSD-3-Clause
Copyright 2009-2010 Satnam Singh, 2009-2011 Simon Marlow, 2009 Donnie Jones, 2011-2012 Duncan Coutts, 2011-2014 Mikolaj Konarski, 2011 Nicolas Wu, 2011 Eric Kow
Author Satnam Singh <>, Simon Marlow <>, Donnie Jones <>, Duncan Coutts <>, Mikolaj Konarski <>, Nicolas Wu <>, Eric Kow <>
Maintainer Simon Marlow <>
Category Development, Profiling, Trace
Home page
Bug tracker
Source repo head: git clone
Uploaded by MitsutoshiAoe at 2020-03-03T22:45:47Z


Maintainer's Corner

Package maintainers

For package maintainers and hackage trustees

Readme for threadscope-0.2.12

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Using pre-built binaries

Currently pre-built binaries for the following platforms are provided:

GTK+2 needs to be installed for those binaries to work.

On OS X, gtk-mac-integration also needs to be installed:

brew install gtk+ gtk-mac-integration

On Windows, the MSYS2 is the recommended way to install GTK+2. In MSYS2 MINGW64 shell:


then you can run the threadscope binary from the shell.

Building from source

Use git clone or cabal unpack threadscope to get the source and move into the threadscope directory.


GTK+2 is required to be installed. On Ubuntu-like systems:

sudo apt install libgtk2.0-dev

Then you can build threadscope using cabal:

cabal v2-build

Or using stack:

stack setup
stack install


GTK+, gtk-mac-integration and GCC 9 are required:

brew install gtk+ gtk-mac-integration gcc@9

Then you can build threadscope using cabal:

cabal v2-build --project-file=cabal.project.osx

Or using stack:

stack setup
stack install --flag gtk:have-quartz-gtk


Chocolatey can be used to install GHC and MSYS2 is the recommended way to install GTK+.

choco install ghc
set PATH=C:\\msys64\\mingw64\\bin;C:\\msys64\\usr\\bin;%PATH%
pacman -Sy mingw-w64-x86_64-gtk2

then you can build threadscope using cabal:

cabal v2-build

Or you can use stack instead.

CAVEAT: gtk2 needs to be installed twice: one for stack's MSYS2 environment and another for local MSYS2 environment.

In command prompt:

stack setup
stack exec -- pacman --needed -Sy bash pacman pacman-mirrors msys2-runtime msys2-runtime-devel
stack exec -- pacman -Syu
stack exec -- pacman -Syuu
stack exec -- pacman -S base-devel mingw-w64-x86_64-pkg-config mingw-w64-x86_64-toolchain mingw-w64-x86_64-gtk2
stack install

Then in MSYS2 MINGW64 shell:

echo 'export PATH=$APPDATA/local/bin:$PATH' >> .profile
source .profile

Building using stack is not tested in CI. If you find any issues with building with stack, please update the instructions and send a PR.