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Issue 746558 link

Starred by 3 users

Issue metadata

Status: WontFix
Owner: ----
Closed: Jul 2017
Cc:
Components:
EstimatedDays: ----
NextAction: ----
OS: Mac
Pri: 2
Type: Bug



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#enable-asm-webassembly not enabled by default

Reported by jon...@zynga.com, Jul 19 2017

Issue description

UserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/59.0.3071.115 Safari/537.36

Steps to reproduce the problem:
Our application performance testing indicates a significant increase in asm.js performance with #enable-asm-webassembly explicitly enabled (i.e. not left in default state). We've reproduced this on OSX and Windows 7.
We can try to supply a test application if this is a real mystery.
asm.js code (generated via emscripten) does include the 'use asm'.

What is the expected behavior?
Slower .asm .js performance without #enable-asm-webassembly.

What went wrong?
We had expected the default state of the #enable-asm-webassembly to be enabled.

Did this work before? N/A 

Chrome version: 59.0.3071.115  Channel: stable
OS Version: OS X 10.11.6
Flash Version: Shockwave Flash 26.0 r0

Sorry this is all a big generic, we can try to provide a more detailed test if it's a real mystery. I believe the origin of this is probably our misunderstanding the nature of "asm.js to WASM conversion" being enabled by default.
 
Components: -Blink Blink>JavaScript

Comment 2 by habl...@google.com, Jul 25 2017

Status: WontFix (was: Unconfirmed)
It is great to hear that you get a performance boost with the new pipeline! The new asm.js pipeline is not enabled on 59 Stable per default. We are currently aiming of activating it on 61 Stable though.

Comment 3 by habl...@google.com, Jul 25 2017

Cc: bradnelson@chromium.org
Cc: hablich@chromium.org

Comment 5 by jon...@zynga.com, Jul 25 2017

That's great news.
Just to confirm we did note a significant performance improvement on Chrome 58.
With the #enable-asm-webassembly flag enabled however it improves further still. Frequently outperforming Firefox in our measures.
Much obliged for this info.
Indeed, glad to hear it.

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