Uli Bubenheimer created IO-355:
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Summary: IOUtils read() and skip() methods are performance hogs
Key: IO-355
URL: https://issues.apache.org/jira/browse/IO-355
Project: Commons IO
Issue Type: Bug
Components: Utilities
Affects Versions: 2.4, 2.3
Reporter: Uli Bubenheimer
IOUtils.skip(InputStream, long) and IOUtils.skip(Reader, long) have the worst
possible performance as they always use read() on the input instead of using
skip(). In many cases, using skip() from a subclass of InputStream is much
faster than read(), as the skip() can be implemented via a disk seek.
The IOUtils.skip() methods are used in the read() methods of IOUtils and their
similarly named siblings, so they tend to bring down the performance of all
reads that involve a skip.
Case in point: I have observed this performance degradation with Java 7 on
Windows 7. A series of consecutive reads on a large file on disk that involved
skips changed my performance from 30 secs as my baseline to 10 minutes after
starting to use IOUtils.read().
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