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<base href="https://bugs.webkit.org/" />
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<body><table border="1" cellspacing="0" cellpadding="8">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [ES6] Typical Promise chain easily exhaust memory"
href="https://bugs.webkit.org/show_bug.cgi?id=150295">150295</a>
</td>
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<th>Summary</th>
<td>[ES6] Typical Promise chain easily exhaust memory
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr>
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<th>Product</th>
<td>WebKit
</td>
</tr>
<tr>
<th>Version</th>
<td>WebKit Nightly Build
</td>
</tr>
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<th>Hardware</th>
<td>Unspecified
</td>
</tr>
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<th>OS</th>
<td>Unspecified
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>Normal
</td>
</tr>
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<th>Priority</th>
<td>P2
</td>
</tr>
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<th>Component</th>
<td>JavaScriptCore
</td>
</tr>
<tr>
<th>Assignee</th>
<td>webkit-unassigned@lists.webkit.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>utatane.tea@gmail.com
</td>
</tr></table>
<p>
<div>
<pre>This is originally reported in Chromium/Blink context[1].
In the following example,
```js
"use strict";
var p = null;
(function () {
var N = 1000 * 1000;
var counter = 0;
var resolve;
function read() {
return Promise.resolve({done: ++counter >= N});
}
function pump() {
return read().then(function(r) {
if (counter % 10000 == 0)
gc();
if (r.done) {
return;
}
return pump();
});
}
p = pump();
}());
```
Since it chains promises like `a => b => c => ... too much promises => final`, if there are too much promises, it exhausts memory.
This behavior is well-specified correct behavior, but in practice, we would like to collect / reduce these promises.
[1]: <a href="https://github.com/domenic/streams-demo/issues/4">https://github.com/domenic/streams-demo/issues/4</a></pre>
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