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<dt>Revision</dt> <dd><a href="http://trac.webkit.org/projects/webkit/changeset/209157">209157</a></dd>
<dt>Author</dt> <dd>beidson@apple.com</dd>
<dt>Date</dt> <dd>2016-11-30 14:59:28 -0800 (Wed, 30 Nov 2016)</dd>
</dl>
<h3>Log Message</h3>
<pre>IndexedDB 2.0: Send operations off to the server in batches instead of one at a time.
https://bugs.webkit.org/show_bug.cgi?id=165221
Reviewed by Myles C. Maxfield.
No new tests (No observable behavior change).
On a profile of "Lots of writes to an IndexedDB", timer scheduling/firing presented as over 10% of the time.
This patch negates much of that.
* Modules/indexeddb/IDBTransaction.cpp:
(WebCore::IDBTransaction::pendingOperationTimerFired): Send 100 operations off to the server
before spinning the runloop, instead of only 1.</pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#trunkSourceWebCoreChangeLog">trunk/Source/WebCore/ChangeLog</a></li>
<li><a href="#trunkSourceWebCoreModulesindexeddbIDBTransactioncpp">trunk/Source/WebCore/Modules/indexeddb/IDBTransaction.cpp</a></li>
</ul>
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<div id="patch">
<h3>Diff</h3>
<a id="trunkSourceWebCoreChangeLog"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/ChangeLog (209156 => 209157)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/ChangeLog 2016-11-30 22:45:38 UTC (rev 209156)
+++ trunk/Source/WebCore/ChangeLog 2016-11-30 22:59:28 UTC (rev 209157)
</span><span class="lines">@@ -1,3 +1,20 @@
</span><ins>+2016-11-30 Brady Eidson <beidson@apple.com>
+
+ IndexedDB 2.0: Send operations off to the server in batches instead of one at a time.
+ https://bugs.webkit.org/show_bug.cgi?id=165221
+
+ Reviewed by Myles C. Maxfield.
+
+ No new tests (No observable behavior change).
+
+ On a profile of "Lots of writes to an IndexedDB", timer scheduling/firing presented as over 10% of the time.
+
+ This patch negates much of that.
+
+ * Modules/indexeddb/IDBTransaction.cpp:
+ (WebCore::IDBTransaction::pendingOperationTimerFired): Send 100 operations off to the server
+ before spinning the runloop, instead of only 1.
+
</ins><span class="cx"> 2016-11-30 Antoine Quint <graouts@apple.com>
</span><span class="cx">
</span><span class="cx"> [Modern Media Controls] Controls are not visible when returning from picture-in-picture playback
</span></span></pre></div>
<a id="trunkSourceWebCoreModulesindexeddbIDBTransactioncpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/Modules/indexeddb/IDBTransaction.cpp (209156 => 209157)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/Modules/indexeddb/IDBTransaction.cpp 2016-11-30 22:45:38 UTC (rev 209156)
+++ trunk/Source/WebCore/Modules/indexeddb/IDBTransaction.cpp 2016-11-30 22:59:28 UTC (rev 209157)
</span><span class="lines">@@ -406,17 +406,19 @@
</span><span class="cx"> if (!m_transactionOperationsInProgressQueue.isEmpty() && !m_transactionOperationsInProgressQueue.last()->nextRequestCanGoToServer())
</span><span class="cx"> return;
</span><span class="cx">
</span><del>- if (!m_pendingTransactionOperationQueue.isEmpty()) {
</del><ins>+ // We want to batch operations together without spinning the runloop for performance,
+ // but don't want to affect responsiveness of the main thread.
+ // This number is a good compromise in ad-hoc testing.
+ static const size_t operationBatchLimit = 128;
+
+ for (size_t iterations = 0; !m_pendingTransactionOperationQueue.isEmpty() && iterations < operationBatchLimit; ++iterations) {
</ins><span class="cx"> auto operation = m_pendingTransactionOperationQueue.takeFirst();
</span><span class="cx"> m_transactionOperationsInProgressQueue.append(operation.get());
</span><span class="cx"> operation->perform();
</span><span class="cx">
</span><del>- // If this operation we just started has an associated IDBRequest, we might be able to send
- // another operation to the server before it completes.
- if (operation->idbRequest() && !m_pendingTransactionOperationQueue.isEmpty())
- schedulePendingOperationTimer();
</del><ins>+ if (!operation->nextRequestCanGoToServer())
+ break;
</ins><span class="cx">
</span><del>- return;
</del><span class="cx"> }
</span><span class="cx">
</span><span class="cx"> if (!m_transactionOperationMap.isEmpty() || !m_openRequests.isEmpty())
</span></span></pre>
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