Maps, sets, and hashtables in core
The below post is mostly lifted from an email I sent to the Core mailing list. It explains the type hackery we employ in order...
Bootstrapping OCaml/async on the Raspberry Pi
On Friday morning I discovered a Raspberry Pi on my desk. The Raspberry Pi is a small single-board computer powered by a 700MHz ARM CPU....
By: Michael Bacarella
Announcing OCaml Labs
Jane Street is deeply invested in OCaml and in the larger OCaml community, which we depend on both for the new recruits it provides as...
By: Yaron Minsky
Jane Street at OUD
Jane Street gave a collection of talks at the collection of conferences colocated with this year’s ICFP. For me, the most exciting day was the...
By: David House
Observer effect and YOU (NSLCD and GetPWNam()-a-plenty)
So, whilst rooting around on one of our servers’s /var/log/*, I noticed that nslcd was attempting to look up, as usernames, apparently just regular strings...
By: Pavel May
Repos, RPMs, and bootstraps, oh my!
Dell’s OMSA (Open Manage Server Administrator) tools are quite nice, but the 6.5.x (and prior) version’s installation process did not lend itself to being automated...
By: Pavel May
Speed Up
Sometimes we need to inspect a lot of systems at once and its annoying to have to wait a long time for a result. What...
By: John Kilburg
Finding references to lazily unmounted filesystems
Just because a file system is lazily unmounted (or so claims the mount command and /proc/mounts), doesn't mean it is no longer in use. Here's...
By: Pavel May
OCaml for the Sysadmins
I sent a link to Yaron Minsky’s article OCaml for the Masses to some long time buddies of mine and one of them said that...
By: John Kilburg
S-Expressions in ruby
We use a lot of S-Expressions at Jane Street. Almost every system written at Jane Street in OCaml uses sexps for config files, and we...
By: Ralph Douglass
Linux disk crypto, now with ease
Imagine that you want to host a Linux machine outside of your own physical control. Imagine that it can get resold later to people who...
By: Pavel May
ML workshop
The upcoming ML workshop is September 13th in Copenhagen. The goal is to bring together users and researchers, with users particularly welcome to propose a...
By: Stephen Weeks
Do you solve real problems with FP? Then come talk about it at CUFP!
The 2012 CUFP call for presentations is out. CUFP is the Commerical Users of Functional Programming workshop, and it’s a great place to interact with...
By: Yaron Minsky
The adventures in NIC bonding
So. Had an interesting problem happen. On a CentOS 5.5 system (2.6.18-194.26.1.el5), an attempt was made to establish a 3-way LACP-style (aka 802.3ad) bonded NIC...
By: Pavel May
OpenLDAP, DBD, and you.
So, today we’ve had us a wee bit of an issue with our OpenLDAP servers – to LDAP clients, the server, on attempts to do...
By: Pavel May
Iterative email problem solving with python, Part 2
Once we’d fixed up all our message IDs (see part 1) we let imapsync loose on the first few beta testers who noticed that the...
By: Patrick Hahn
Iterative email problem solving with python.
One of the little joys of being a sysadmin is being able to solve a problem by composing a highly specific tool out of a...
By: Patrick Hahn
Making staging explicit
We just had an interesting discussion around the office about staging and curried functions. I was reading over a new string-escaping routine, which had the...
By: Yaron Minsky
