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From: Eric Wong <e@yhbt.net>
To: Jean Boussier <jean.boussier@shopify.com>
Cc: unicorn-public@yhbt.net
Subject: Re: [PATCH] Add early hints support
Date: Thu, 16 Jul 2020 12:16:43 +0000	[thread overview]
Message-ID: <20200716121643.GA26942@dcvr> (raw)
In-Reply-To: <242F0859-0F83-4F14-A0FF-5BE392BB01E6@shopify.com>

Jean Boussier <jean.boussier@shopify.com> wrote:
> Thanks for the very timely response.
> 
> > Since this RDoc ends up on the website, links to any relevant
> > Rails documentation and RFC 8297 would also be appropriate.
> > Otherwise non-Rails users like me might have no clue what
> > it's for.
> 
> I updated the documentation, let me know what you think of it.

It's fine, pushed for now.  Will release in a few days or a week
in case there's comments from others.

> > Are the method calls for .to_s necessary?
> 
> I don't think they are, I mostly took inspiration from the puma implementation
> that does all this defensive checks. Based on how that interface is
> used by Rails, we could assume both keys and values are strings already.
> 
> I simplified the implementation.

OK.

> > Eep, extra branch...  What's the performance impact for existing
> > users when not activated? (on Unix sockets).
> 
> Extremely small.

Alright, numbers would've been helpful but I'll take your word
for it.

If we get more branches in the main loop for other new features;
I wonder if generating the code for process_client dynamically
at initialize-time is worth it to avoid branches in the main
loop... (or if there's some way to hint MJIT to do that).

> > Perhaps bypassing the method and accessing the @early_hints ivar
> > directly can be slightly faster w/o method dispatch.  That
> > should also allow using attr_writer instead of attr_accessor,
> > I think.
> 
>  attr_reader is very optimized in MRI, it's barely slower than @early_hints.
> Also it ensure that it doesn't emit a warning in verbose mode if the variable
> isn't initialized.

Thanks again.

  reply	other threads:[~2020-07-16 12:16 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-16 10:05 Jean Boussier
2020-07-16 10:50 ` Eric Wong
2020-07-16 11:41   ` Jean Boussier
2020-07-16 12:16     ` Eric Wong [this message]
2020-07-16 12:24       ` Jean Boussier
2020-07-17  1:19         ` Eric Wong
2020-07-20  9:18           ` Jean Boussier
2020-07-20 10:09             ` Eric Wong
2020-07-20 10:27               ` Jean Boussier
2020-07-20 10:55                 ` Eric Wong
2020-07-20 11:53                   ` Jean Boussier
2020-07-20 20:27                     ` Eric Wong

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