[
https://issues.apache.org/jira/browse/IO-515?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15530253#comment-15530253
]
ASF GitHub Bot commented on IO-515:
-----------------------------------
Github user brettlounsbury closed the pull request at:
https://github.com/apache/commons-io/pull/22
> 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.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
