On Wednesday, December 19, 2012 11:03:34 AM UTC-8, Isaac Schlueter wrote:
>
> Relevant to this discussion:
> http://mrale.ph/blog/2012/12/15/microbenchmarks-fairy-tale.html
>
just because of this one link....
1. read the fairy tale, checked out its links.
a) read the Ask a Foolish question link
b) then read about Self (from the other universe link).
2. went to the rest of the mraleph blog.
3. liked his shaky diagrams.
a) cloned his dart repo and made some distasteful shaky diagrams.
4. an hour gone, decided to get back to work...
oh and i had a cup of coffee too.
good read though.
>
> Always profile before you optimize! (Flamegraphs are pretty much the
> ideal tool for this.) Then optimize the bits where your program is
> *actually* spending time. If you're spending less than 10% of your
> programs' time in a particular function, then don't even bother.
>
> If your application's performance is impacted by even as much as 0.5%
> as a result of whether you return the cb call, or return right after
> it, I'll be flabbergasted. If you are accurately *testing* this with
> a microbenchmark (and not just doing silly little dances with the
> compiler), then you deserve a medal.
>
>
> On Wed, Dec 19, 2012 at 9:13 AM, mscdex <[email protected] <javascript:>>
> wrote:
> > On Dec 19, 12:08 pm, mscdex <[email protected]> wrote:
> >> On Dec 19, 10:11 am, Camilo Aguilar <[email protected]> wrote:
> >>
> >> > I updated the jsperf test to reflect a bit better the scenario being
> >> > discussed:http://jsperf.com/return-vs-no-return/4
> >> > It seems like v8 optimizes better callback(); return; than return
> >> > callback();
> >>
> >> On Chrome 23 doesReturn is fastest followed by doesValuelessReturn and
> >> then noReturn.
> >
> > I forgot to add: it's also faster on the node master branch -- they
> > must use similar versions of v8?
> >
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