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worker: improve MessagePort performance
Use a JS function as the single entry point for emitting `.onmessage()` calls, avoiding the overhead of manually constructing each message event object in C++. confidence improvement accuracy (*) (**) (***) worker/echo.js n=100000 sendsPerBroadcast=1 payload='object' workers=1 *** 16.34 % ±1.16% ±1.54% ±1.99% worker/echo.js n=100000 sendsPerBroadcast=1 payload='string' workers=1 *** 24.41 % ±1.50% ±1.99% ±2.58% worker/echo.js n=100000 sendsPerBroadcast=10 payload='object' workers=1 *** 26.66 % ±1.54% ±2.05% ±2.65% worker/echo.js n=100000 sendsPerBroadcast=10 payload='string' workers=1 *** 32.72 % ±1.60% ±2.11% ±2.73% worker/messageport.js n=1000000 payload='object' *** 40.28 % ±1.48% ±1.95% ±2.52% worker/messageport.js n=1000000 payload='string' *** 76.95 % ±2.19% ±2.90% ±3.75% Also fix handling exceptions returned from `MessagePort::New`. PR-URL: #31605 Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Denys Otrishko <shishugi@gmail.com> Reviewed-By: Rich Trott <rtrott@gmail.com>
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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,12 @@ | ||
'use strict'; | ||
class MessageEvent { | ||
constructor(data, target) { | ||
this.data = data; | ||
this.target = target; | ||
} | ||
} | ||
|
||
exports.emitMessage = function(data) { | ||
if (typeof this.onmessage === 'function') | ||
this.onmessage(new MessageEvent(data, this)); | ||
}; |
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