Bug 87124 - Web Inspector: HeapSnapshot: speed-up calculateRetainedSize functon.
Summary: Web Inspector: HeapSnapshot: speed-up calculateRetainedSize functon.
Alias: None
Product: WebKit
Classification: Unclassified
Component: Web Inspector (Deprecated) (show other bugs)
Version: 528+ (Nightly build)
Hardware: All All
: P2 Normal
Assignee: Ilya Tikhonovsky
Depends on:
Blocks: 87107
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Reported: 2012-05-22 05:54 PDT by Ilya Tikhonovsky
Modified: 2012-05-22 07:21 PDT (History)
11 users (show)

See Also:

Patch (11.11 KB, patch)
2012-05-22 06:11 PDT, Ilya Tikhonovsky
yurys: review+
Details | Formatted Diff | Diff

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Description Ilya Tikhonovsky 2012-05-22 05:54:59 PDT
I found that in all dominators related functions we use nodeOrdinals.
At the moment we divide nodeIndex to nodeFieldCount and this operation too expensive for these simple algorithms.
Comment 1 Ilya Tikhonovsky 2012-05-22 06:03:31 PDT
RESULT heap-snapshot: _calculateRetainedSizes= 245 ms
RESULT heap-snapshot: _buildDominatedNodes= 33 ms


RESULT heap-snapshot: _calculateRetainedSizes= 87 ms
RESULT heap-snapshot: _buildDominatedNodes= 15 ms
Comment 2 Ilya Tikhonovsky 2012-05-22 06:11:54 PDT
Created attachment 143290 [details]
Comment 3 Yury Semikhatsky 2012-05-22 06:14:50 PDT
Comment on attachment 143290 [details]

View in context: https://bugs.webkit.org/attachment.cgi?id=143290&action=review

> Source/WebCore/inspector/front-end/HeapSnapshot.js:462
> +        return this._snapshot._dominatorsTree[this.nodeIndex / this._snapshot._nodeFieldCount] * nodeFieldCount;

this._snapshot._nodeFieldCount ->  nodeFieldCount
Comment 4 Ilya Tikhonovsky 2012-05-22 06:25:10 PDT
Committed r117962: <http://trac.webkit.org/changeset/117962>