I am now officially 21 years old and also the owner of this cool, Wacom Bamboo Pen Graphics Tablet from Amazon
I am now officially 21 years old and also the owner of this cool, Wacom Bamboo Pen Graphics Tablet from Amazon
“Perf” is a common command line linux tool used for code profiling, (perf wiki). A alpha version of a OCaml native code compiler that output code, that can be analysis by perf is now avalaible in OPAM
Installation
Installing the perf compatible OCaml compiler is straight forward with OPAM, though quite time-consuming due to the need to re-install many packages
$ opam remote add perf git://github.com/mshinwell/opam-repo-dev $ opam switch 4.01-perf-annotate $ eval `opam config env` $ opam install |
Installing perf was also straight forward, in fact I already had it via the linux-tools package in apt-get for Ubuntu.
sudo apt-get install linux-tools |
Usage
Compiling with the new perf-compatable Ocaml compiler was beautifully simple, running make within an existing project working first time without any further changes necessary.
Basics
Basic reporting is collected and viewed using:
sudo perf record ./myprogram.native -o myreport.data sudo perf report -i myreport.data sudo perf script -i myreport.data |
Similarly basic stats can be collected using:
sudo perf stat ./myprogram.native -o myreport.data sudo cat myreport.data |
When finished you can switch back to your normal compiler version, i.e.
$ opam switch 4.00.1 $ eval `opam config env` |
If your taking your first steps in Janestreet’s Async library, here’s some sources of help & support:
My top 5 sources of Async Documentation
Community
Google group for Janestreet’s Core & Async, the JS team are really helpful 🙂 : https://groups.google.com/forum/#!forum/ocaml-core
Async issue tracker on Github is quiet but still a good point to start a conversation: https://github.com/janestreet/async/issues?state=open
Installation
I recommend the installation chapter of Real World Ocaml: https://realworldocaml.org/beta3/en/html/installation.html and install instructions for OPAM: http://opam.ocamlpro.com/doc/Quick_Install.html
Janestreet provide some installation hints, though this is covered for comprehensively in RWO (linked above): http://janestreet.github.io/installation.html
Very light background reading: https://ocaml.janestreet.com/?q=node/100