Pitchfork: Rack HTTP server for shared-nothing architecture

1. pitchfork

   1 13 775 7.8 Ruby

   

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3. Puma

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   I'm the author of the original 'refork' feature introduced to Puma a couple years ago [1], that served as an inspiration for this project.

   As I understand it, Pitchfork is an implementation of a reforking feature on top of Unicorn, a single-threaded multi-process Rack HTTP server.

   The general idea of 'reforking' is that in addition to pre-forking worker processes at initialization time, you re-fork them on an ongoing basis, in order to optimize copy-on-write efficiency across processes, especially for memory allocations that might happen after initialization. The Pitchfork author mentions sharing YJIT machine code as a particularly important use-case [2], one that has become relevant in recent Ruby releases.

   I never saw much interest in the concept when I originally introduced the reforking feature to Puma, and it remained a kind of interesting experiment that never saw much production uptake. I'm thrilled that Shopify is iterating on the concept through this project and I hope the technique will continue to be refined and developed, and see broader adoption as a result.

   [1] https://github.com/puma/puma/pull/2099

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   Could you command on any projects within Shopify that are helping Ruby's concurrency story? I'm aware of Ractors (https://docs.ruby-lang.org/en/master/ractor_md.html) and Fibers, but it's unclear to how feasible these primitives currently are to build the necessary abstractions on top of them that would make Rails more concurrent.

   https://github.com/socketry/falcon is an interesting project, but again, it's not clear how difficult it would be deploying a Rails app on top of this.

   There's a lot of really great projects happening and plenty to be hopeful about, but when that stuff will land or the changes the rest of the community and ecosystem should think about making still isn't clear.

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