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Faster output header handling #528

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Faster output header handling #528

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benaadams
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From #519

@davidfowl
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How much does this actually save?

@benaadams
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It could save more, but are some oddities with nulls (being valid stored values but not output; is even a test for it and related things)

Otherwise a fair bit and moves CreateResponseHeader out of the heavy functions; as without it, it repeatedly does:

new Enumerator -> Movenext -> Current -> Movenext for every header; as well as keep-alive check

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@benaadams I'd like to see numbers. This looks like an uber micro-optimization.

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Perf is in #519 (comment)

Numbers are hard to get matching; but look at the ratios for FrameResponseHeaders.CopyToFast - CopyFrom is the same in both and doesn't include enumerator .ctor

Pre change
pre-change
Without
post-change

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Can run longer perf tests if you want more equivalent numbers?

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StringValues enumerator is currently fairly inefficient; this might become less a factor after PR dotnet/extensions#74

@benaadams benaadams mentioned this pull request Dec 28, 2015
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@benaadams benaadams force-pushed the stringvalue-enumerator branch from b2611a2 to 36789e4 Compare December 29, 2015 09:28
@benaadams benaadams changed the title Skip StringValue enumerator when < 2 values Faster output header handling Dec 29, 2015
@benaadams benaadams force-pushed the stringvalue-enumerator branch from 36789e4 to da2d666 Compare December 29, 2015 09:32
benaadams added a commit to benaadams/KestrelHttpServer that referenced this pull request Dec 29, 2015
@benaadams
Known headers have known offsets
3a501ec 
Also has aspnet#528
Faster output header handling aspnet#528 in it :-/
benaadams added a commit to benaadams/KestrelHttpServer that referenced this pull request Dec 29, 2015
@benaadams
Known headers have known offsets
0578baf 
Also has aspnet#528
Faster output header handling aspnet#528 in it :-/
@benaadams benaadams mentioned this pull request Dec 29, 2015
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@benaadams
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Merged with #524 due to Generated file clash

@benaadams benaadams closed this Dec 29, 2015
benaadams added a commit to benaadams/KestrelHttpServer that referenced this pull request Dec 30, 2015
@benaadams
Known headers have known offsets
429c04f 
Also has "Faster output header handling" aspnet#528 in it :-/
benaadams added a commit to benaadams/KestrelHttpServer that referenced this pull request Jan 2, 2016
@benaadams
Known headers have known offsets
aeff8fc 
Also has "Faster output header handling" aspnet#528 in it :-/
benaadams added a commit to benaadams/KestrelHttpServer that referenced this pull request Jan 5, 2016
@benaadams
Known headers have known offsets
650e6e7 
Also has "Faster output header handling" aspnet#528 in it :-/
benaadams added a commit to benaadams/KestrelHttpServer that referenced this pull request Jan 5, 2016
@benaadams
Known headers have known offsets
f096964 
Also has "Faster output header handling" aspnet#528 in it :-/
@benaadams benaadams deleted the stringvalue-enumerator branch May 10, 2016 10:59
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3 participants
@benaadams @davidfowl @dnfclas