[jboss-jira] [JBoss JIRA] Created: (JBVFS-26) Optimize frequently called methods to improve AS boot time.

Wed May 21 04:42:59 EDT 2008

Optimize frequently called methods to improve AS boot time.
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                 Key: JBVFS-26
                 URL: http://jira.jboss.com/jira/browse/JBVFS-26
             Project: JBoss VFS
          Issue Type: Task
      Security Level: Public (Everyone can see)
    Affects Versions:  2.0.0.Beta11
            Reporter: Dimitris Andreadis
         Assigned To: Ales Justin
             Fix For:  2.0.0.CR1

Profiler analysis of AS bootstrap in JBAS-5224 shows a lot of time is spent in VFS methods.

Look in particular at: http://jira.jboss.com/jira/secure/attachment/12320206/as5_hotspots_20_may.html

One direction is to try to reduce the number of calls to the VFS methods from the callers, so this needs to be handled elsewhere.

But another goal is to improve the execution time of the hotspot methods in vfs, e.g.

PathTokenizer.getTokens are called about +330k times in beta4 and ~600k times in trunk. 
AbstractVirtualFileHandler.structuredFindChild has the same increase in calls as PathTokenizer.getTokens. 
AbstractVirtualFileHandler.checkClosed have increased from ~1.4million calls to 3million calls 
MatcherStrategy.subtypeOf have increased from 500k to 680k calls. 

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