Brett Lounsbury created IO-515:
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Summary: 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
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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