feat: use faster isal when available

[bdraco]

isal recommended for speed by pycompression authors pycompression/python-zlib-ng#24 (comment)

Tested on x86_64, macos arm64, and aarch64

[codecov]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (6b57e33) 77.77% compared to head (6ab36b6) 71.42%.
Report is 1 commits behind head on main.

Files	Patch %	Lines
src/aiohttp_zlib_ng/__init__.py	60.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main       #6      +/-   ##
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- Coverage   77.77%   71.42%   -6.35%     
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  Files           1        1              
  Lines          18       21       +3     
  Branches        4        4              
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+ Hits           14       15       +1     
- Misses          2        4       +2     
  Partials        2        2              

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[rhpvorderman]

As a general comment: isa-l compresses to much lower compression levels by default. In case that is undesirable, it is better to use zlib-ng.

On the other hand, if deflate compression is bottlenecking, shaving another 20% of the filesize is not really worth the delay in latency sensitive situations. The difference in speed between zlib-ng level 2 and isa-l level 2 will be much less than the difference between isa-l level 2 (default) and zlib-ng level 6 (default).

zlib-ng level 1 is much bigger than either zlib level 1 or isa-l level 1, at least on genomic data. So I don't recommend using that.

[bdraco]

Seems to be a better trade off with using isal. It's faster and we get better compression for the websocket use case

[rhpvorderman]

Then they are probably already using level 1. Then ISA-L is so much better. The compression speed is incredible, almost as fast as the decompression speed, 5 times faster than zlib. It really is an incredible library. I prefer using ISA-L where I can, and I maintain python-zlib-ng only because python-isal cannot cover all use cases. So all the cool innovations happen in python-isal first and are then ported over later when they proved stable.

[rhpvorderman]

I wonder, have you considered porting this work over to aiohttp directly? In that way everyone will benefit from your work.

[bdraco]

That's the eventual plan.

Usually I try out changes in libraries for a few months before upstreaming them into aiohttp.