[picocontainer-scm] [jira] (PICO-395) Optimization for DefaultPicoContainer.getInstance

[Chris Simmons (JIRA)]

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<a class="user-hover" rel="cps" id="email_cps" href="https://jira.codehaus.org/secure/ViewProfile.jspa?name=cps" style="color:#005500;">Chris Simmons</a>
created <img src="Loading Image..." height="16" width="16" border="0" align="absmiddle" alt="Improvement"> <a style='color:#005500;text-decoration:none;' href='https://jira.codehaus.org/browse/PICO-395'>PICO-395</a>
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<a style='color:#005500;text-decoration:none;' href='https://jira.codehaus.org/browse/PICO-395'><strong>Optimization for DefaultPicoContainer.getInstance</strong></a>
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<strong style="font-weight:normal;color:#505050;">Issue Type:</strong>
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<img src="https://jira.codehaus.org/images/icons/issuetypes/improvement.png" height="16" width="16" border="0" align="absmiddle" alt="Improvement"> Improvement
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<strong style="font-weight:normal;color:#505050;">Affects Versions:</strong>
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2.14.1 </td>
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<strong style="font-weight:normal;color:#505050;">Assignee:</strong>
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<a class="user-hover" rel="paul" id="email_paul" href="https://jira.codehaus.org/secure/ViewProfile.jspa?name=paul" style="color:#005500;">Paul Hammant</a>
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<strong style="font-weight:normal;color:#505050;">Components:</strong>
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PicoContainer (Java) </td>
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<strong style="font-weight:normal;color:#505050;">Created:</strong>
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25/Apr/13 4:39 AM
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<strong style="font-weight:normal;color:#505050;">Description:</strong>
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<p style='margin-top:0;margin-bottom:10px;'>This method</p>

<p style='margin-top:0;margin-bottom:10px;'>DefaultPicoContainer.getInstance()</p>

<p style='margin-top:0;margin-bottom:10px;'>currently does this</p>

<p style='margin-top:0;margin-bottom:10px;'>getModifiableComponentAdapterList().contains(componentAdapter);</p>

<p style='margin-top:0;margin-bottom:10px;'>which involves scraping over an array. This is rather slow for a big container and is proving to be a bottleneck in our application.</p>

<p style='margin-top:0;margin-bottom:10px;'>If you have n containers being instantiated then you'll do contains n times on a list o<img class="emoticon" src="Loading Image..." height="19" width="19" align="absmiddle" alt="" border="0"/> which will be o(n^2) calls to equals.</p>

<p style='margin-top:0;margin-bottom:10px;'>Two simple fixes spring to mind:</p>

<ul>
<li>Keep the component adapters in a set instead - if you use a linked hash set then you'd get exactly the same iteration order but contains() will be fast.</li>
<li>Use the keyToAdapterCache map instead like so:<br/>
getComponentKeyToAdapterCache().get(componentAdapter.getComponentKey()) == componentAdapter</li>
</ul>


<p style='margin-top:0;margin-bottom:10px;'>A more involved alternative might be to admit that a given ComponentAdapter needs to know its parent PicoContainer and hence keep a back-reference so you could do componentAdapater.getPicoContainer() == this.</p>
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<strong style="font-weight:normal;color:#505050;">Project:</strong>
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<a style="color:#005500;" href="https://jira.codehaus.org/browse/PICO">PicoContainer</a>
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<strong style="font-weight:normal;color:#505050;">Priority:</strong>
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<img src="Loading Image..." height="16" width="16" border="0" align="absmiddle" alt="Major"> Major
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<strong style="font-weight:normal;color:#505050;">Reporter:</strong>
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<a class="user-hover" rel="cps" id="email_cps" href="https://jira.codehaus.org/secure/ViewProfile.jspa?name=cps" style="color:#005500;">Chris Simmons</a>
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[Paul Hammant (JIRA)]

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<a class="user-hover" rel="paul" id="email_paul" href="https://jira.codehaus.org/secure/ViewProfile.jspa?name=paul" style="color:#005500;">Paul Hammant</a>
commented on <img src="https://jira.codehaus.org/images/icons/issuetypes/improvement.png" height="16" width="16" border="0" align="absmiddle" alt="Improvement"> <a style='color:#005500;text-decoration:none;' href='https://jira.codehaus.org/browse/PICO-395'>PICO-395</a>
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<a style='color:#005500;text-decoration:none;' href='https://jira.codehaus.org/browse/PICO-395'><strong>Optimization for DefaultPicoContainer.getInstance</strong></a>
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<div class="comment-block" style="background-color:#edf5ff;border:1px solid #dddddd;color:#000000;padding:12px;"><p>Chris, Do you have some load tests that really show the problem? Why am I asking? You might find it easy to try out alternates, to say which one provably makes the issue go away.</p>

<p>Issues for us are that Unit tests are classically good at guarding functionality, and not so good at proving non-functional things. We can do some stuff to make sure thread-realted stuff us good, but performance is really hard with JUnit (etC).</p>

<p>Thoughts?</p>

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<li>Paul</li>
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[Chris Simmons (JIRA)]

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<a class="user-hover" rel="cps" id="email_cps" href="https://jira.codehaus.org/secure/ViewProfile.jspa?name=cps" style="color:#005500;">Chris Simmons</a>
updated <img src="https://jira.codehaus.org/images/icons/issuetypes/improvement.png" height="16" width="16" border="0" align="absmiddle" alt="Improvement"> <a style='color:#005500;text-decoration:none;' href='https://jira.codehaus.org/browse/PICO-395'>PICO-395</a>
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<a style='color:#005500;text-decoration:none;' href='https://jira.codehaus.org/browse/PICO-395'><strong>Optimization for DefaultPicoContainer.getInstance</strong></a>
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<div class="comment-block" style="background-color:#edf5ff;border:1px solid #dddddd;color:#000000;padding:12px;"><p>I've had a think and attempted to write a performance test that shows the performance I'm seeing.</p>

<p>Its a bit slow but it proves the point and hopefully wouldn't give too many spurious errors.</p></div>
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<strong style="font-weight:normal;color:#505050;">Change By:</strong>
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<a class="user-hover" rel="cps" id="email_cps" href="https://jira.codehaus.org/secure/ViewProfile.jspa?name=cps" style="color:#005500;">Chris Simmons</a>
(01/May/13 8:55 AM)
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<strong style="font-weight:normal;color:#505050;">Attachment:</strong>
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<span class="diffaddedchars" style="background-color:#ddfade;">TestDefaultPicoContainerPerformance.java</span>

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[Michal Skowronek (JIRA)]

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<p style="margin: 10px 0 0 0">I've noticed exactly the same thing as Chris - there's a serious drop of performance, when Pico is frequently being asked for any component in a bigger container. CPU snapshots from profiler confirm that the problem lays in List.contains(componentAdapter) calls.<br /> Are there plans to fix this issue soon?<br /> Maybe I could contribute the fix (which I don't have yet, of course <img class="emoticon" src="Loading Image..." height="16" width="16" align="absmiddle" alt="" border="0" /> ) ?</p>
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<td class="page-title-pattern-first-line " style="padding: 0px; border-collapse: collapse; font-family: Arial, sans-serif; font-size: 14px; padding-top: 10px"> <a href="https://jira.codehaus.org/browse/PICO" style="color: #3b73af; text-decoration: none">PicoContainer</a> / <a href="https://jira.codehaus.org/browse/PICO-395" style="color: #3b73af; text-decoration: none"><img src="https://jira.codehaus.org/images/icons/issuetypes/improvement.png" height="16" width="16" border="0" align="absmiddle" alt="Improvement" style="vertical-align: text-bottom" /></a> <a href="https://jira.codehaus.org/browse/PICO-395" style="color: #3b73af; text-decoration: none">PICO-395</a>
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This method <br /> <br /> DefaultPicoContainer.getInstance() <br /> <br /> currently does this <br /> <br /> getModifiableComponentAdapterList().contains(componentAdapter); <br /> <br /> which involves scraping over an array. This is rather slow for a big container and is proving to be a bottleneck in our application. <br /> <br /> If you have n containers being instantiated then you'll do contains n times o...
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<p style="margin: 10px 0 0 0">fixed as suggested</p>
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<td class="page-title-pattern-first-line " style="padding: 0px; border-collapse: collapse; font-family: Arial, sans-serif; font-size: 14px; padding-top: 10px"> <a href="https://jira.codehaus.org/browse/PICO" style="color: #3b73af; text-decoration: none">PicoContainer</a> / <a href="https://jira.codehaus.org/browse/PICO-395" style="color: #3b73af; text-decoration: none"><img src="https://jira.codehaus.org/images/icons/issuetypes/improvement.png" height="16" width="16" border="0" align="absmiddle" alt="Improvement" style="vertical-align: text-bottom" /></a> <a href="https://jira.codehaus.org/browse/PICO-395" style="color: #3b73af; text-decoration: none">PICO-395</a>
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Change By:
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<td style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <a class="user-hover" rel="paul" id="email_paul" href="https://jira.codehaus.org/secure/ViewProfile.jspa?name=paul" style="color:#005500;; color: #3b73af; text-decoration: none">Paul Hammant</a>
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Resolution:
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<td style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <span class="diffaddedchars" style="background-color:#ddfade;">Fixed</span>
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Fix Version/s:
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<td style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <span class="diffaddedchars" style="background-color:#ddfade;">2.15</span>
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Status:
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