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rsync rounds timestamps to the nearest second

I’m not sure how I’ve managed to use rsync for so many years without evernoticing this, but hey, you learn something new every day!

07 Oct 2015

Jane Street Tech Blog

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No (functional) experience required

Jane Street is a serious functional programming shop. We use OCaml, a staticallytyped functional language for almost everything and have what is probably the...

19 Aug 2015

Jane Street Tech Blog

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Introducing Incremental

I’m pleased to announce the release ofIncremental (wellcommented mlihere),a powerful library for building self-adjusting computations, i.e.,computations that...

18 Jul 2015

Jane Street Tech Blog

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Converting a code base from camlp4 to ppx

As with many projects in the OCaml world, at Jane Street we have been working onmigrating from camlp4 to ppx. After having developed equivalent ppx rewriters...

08 Jul 2015

Jane Street Tech Blog

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CPU Registers and OCaml

Even though registers are a low-level CPU concept, having some knowledge aboutthem can help write faster code. Simply put, a CPU register is a storage for as...

05 May 2015

Jane Street Tech Blog

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Reverse web proxy in ~50 lines of BASH

In the spirit of reinventing the wheel for fun, I hacked this together as aquick challenge to myself last week. It’s a little rough around the edges, but Ith...

01 May 2015

Jane Street Tech Blog

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Building a lower-latency GC

We’ve been doing a bunch of work recently on improving the responsiveness ofOCaml’s garbage collector. I thought it would be worth discussing thesedevelopmen...

10 Apr 2015

Jane Street Tech Blog

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Faster OCaml to C calls

The official OCaml documentation “Interfacing C withOCaml” doesn’tdocument some interesting performance features.

09 Apr 2015

Jane Street Tech Blog

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Why GADTs matter for performance

When GADTs (Generalized Algebraic DataTypes) landed inOCaml, I wasn’t particularly happy about it. I assumed that it was the kind ofnonsense you get when you...

30 Mar 2015

Jane Street Tech Blog

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A lighter Core

We recently released a version of our open source libraries with a muchanticipatedchange– Async_kernel, the heart of the Async concurrent programming library...

21 Mar 2015

Jane Street Tech Blog

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