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Posted to issues@commons.apache.org by "Gary Gregory (JIRA)" <ji...@apache.org> on 2016/09/28 02:12:20 UTC
[jira] [Updated] (IO-515) Allow Specifying Initial Buffer Size of
DeferredFileOutputStream
[ https://issues.apache.org/jira/browse/IO-515?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Gary Gregory updated IO-515:
----------------------------
Fix Version/s: 2.6
> Allow Specifying Initial Buffer Size of DeferredFileOutputStream
> ----------------------------------------------------------------
>
> Key: IO-515
> URL: https://issues.apache.org/jira/browse/IO-515
> Project: Commons IO
> Issue Type: Improvement
> Components: Streams/Writers
> Reporter: Brett Lounsbury
> Assignee: Gary Gregory
> Fix For: 2.6
>
>
> Right now the DeferredFileOutputStream uses a ByteArrayOputStream for its in memory buffer. It simply does new ByteArrayOutputStream() which initializes the ByteArrayOutputStream's internal buffer to 32B. In the case of large threshold values for in-memory buffering this can become very inefficient (Requiring 15 array doubling operations to grow to 1MB and producing an extra 1MB of garbage along the way).
> By allowing the user to specify the initial buffer size we allow them to tune how many times the array will need to double to something that meets their application's needs.
> In our testing we had an application that used a DeferredFileOutputStream to capture incoming data. Once that data was fully captured it did some fairly CPU intensive processing of the data. The ByteArrayOutputStream used by DeferredFileOutputStream was using 60% of our host's CPU simply on array copying.
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