ruby-core

Issue #14739 has been updated by ioquatix (Samuel Williams).


I've made a new branch with the new implementation above.

It shows a slightly improved performance improvement over `libcoro`.

Here is without the PR:

```
^_^ > ./build/bin/ruby ./fiber_benchmark.rb 10000 1000
setup time for 10000 fibers:   0.161763
execution time for 1000 messages:  14.018874
setup time for 10000 fibers:   1.572869
execution time for 1000 messages:  13.778874
setup time for 10000 fibers:   0.917040
execution time for 1000 messages:  13.942525
setup time for 10000 fibers:   1.616929
execution time for 1000 messages:  13.991115
setup time for 10000 fibers:   1.623587
execution time for 1000 messages:  14.281334
```

And here it is with the PR, on macOS (the same system used in previous benchmarks):

```
^_^ > ./build/bin/ruby ./fiber_benchmark.rb 10000 1000 
setup time for 10000 fibers:   0.160637
execution time for 1000 messages:   6.009332
setup time for 10000 fibers:   0.244175
execution time for 1000 messages:   6.246711
setup time for 10000 fibers:   0.242718
execution time for 1000 messages:   6.142166
setup time for 10000 fibers:   0.233410
execution time for 1000 messages:   5.994752
setup time for 10000 fibers:   0.288830
execution time for 1000 messages:   6.216617
```

Performance is about 2~2.5x faster depending on your analysis. Both creation and execution time is improved. But remember this is micro-benchmark.

I was also interested in mjit performance:

Without PR, enabled mjit:

```
^_^ > ./build/bin/ruby --jit ./fiber_benchmark.rb 10000 1000
setup time for 10000 fibers:   0.172145
execution time for 1000 messages:  25.176702
setup time for 10000 fibers:   1.654751
execution time for 1000 messages:  14.729177
setup time for 10000 fibers:   1.016810
execution time for 1000 messages:  15.154141
setup time for 10000 fibers:   1.726305
execution time for 1000 messages:  14.797269
setup time for 10000 fibers:   2.025997
execution time for 1000 messages:  15.124753
```

With PR, enabled mjit:

```
x_x > ./build/bin/ruby --jit ./fiber_benchmark.rb 10000 1000
setup time for 10000 fibers:   0.179744
execution time for 1000 messages:  13.793318
setup time for 10000 fibers:   0.354717
execution time for 1000 messages:  10.664870
setup time for 10000 fibers:   0.308818
execution time for 1000 messages:   6.956352
setup time for 10000 fibers:   0.378568
execution time for 1000 messages:   6.553922
setup time for 10000 fibers:   0.295583
execution time for 1000 messages:   7.274086
```

We can see it still needs a bit of work.

I will try to isolate some interesting results from higher level frameworks.

The updated branch is here: https://github.com/ioquatix/ruby/tree/native-fiber

It only work on Darwin x84 at the moment, because changes to autoconf do not cover all platforms yet. I'll fix this soon.

----------------------------------------
Feature #14739: Improve fiber yield/resume performance
https://bugs.ruby-lang.org/issues/14739#change-72339

* Author: ioquatix (Samuel Williams)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
----------------------------------------
I am interested to improve Fiber yield/resume performance.

I've used this library before: http://software.schmorp.de/pkg/libcoro.html and handled millions of HTTP requests using it.

I'd suggest to use that library.

As this is used in many places in Ruby (e.g. enumerable) it could be a big performance win across the board.

Here is a nice summary of what was done for RethinkDB: https://rethinkdb.com/blog/making-coroutines-fast/

Does Ruby currently reuse stacks? This is also a big performance win if it's not being done already.



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