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From "Wiktor N (JIRA)" <j...@apache.org>
Subject [jira] [Created] (JCS-148) Unnecessary use of FileChannel.force() in Indexed and Block Disk Caches
Date Sat, 04 Apr 2015 21:08:33 GMT
Wiktor N created JCS-148:
----------------------------

             Summary: Unnecessary use of FileChannel.force() in Indexed and Block Disk Caches
                 Key: JCS-148
                 URL: https://issues.apache.org/jira/browse/JCS-148
             Project: Commons JCS
          Issue Type: Improvement
          Components: Indexed Disk Cache
    Affects Versions: jcs-2.0-beta-1
            Reporter: Wiktor N


In: IndexedDisk.write() and BlokDisk.write() at the end FileChannel.force() is called.

It introduces a lot of I/O and affects performance.

After removal of these two lines, mvn test raises no issues.

The test case org.apache.commons.jcs.auxiliary.disk.indexed.HugeQuantityIndDiskCacheLoadTest
goes from 450 seconds needed for completion to 30 seconds on my system.

As the data file is useless without proper keyfile, which is stored only on shutdown, then
I guess we can resign from fc.force() on data writes.



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