You are viewing a plain text version of this content. The canonical link for it is here.

Posted to issues@commons.apache.org by "Wiktor N (JIRA)" <ji...@apache.org> on 2015/04/04 23:08:33 UTC

[jira] [Created] (JCS-148) Unnecessary use of FileChannel.force() in Indexed and Block Disk Caches

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.



--
This message was sent by Atlassian JIRA
(v6.3.4#6332)