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https://issues.apache.org/jira/browse/COMPRESS-440?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dawid Weiss updated COMPRESS-440:
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Description:
With the buffer applied in COMPRESS-438 the decompression speed is actually
quite all right, but there's still room for improvement. I was quite curious
what the bounds for pure-java inflater would be and hacked a quick experiment
with ZipFile using jzlib's implementation [1] to decompress a large-ish archive
(openjdk8 repository).
The results for deflate, deflate64 and java's built-in decompressor are below.
{code}
Java (Inflater):
archive.zip 4.38 sec., 444,357,134 archived => 731,621,181 decompressed
jzlib's pure-java inflater:
archive.zip 6.65 sec., 444,357,134 archived => 731,621,181 decompressed
current deflate64 in commons-compress (with my allocation-reducing patch):
archive64.zip 11.35 sec., 443,209,798 archived => 731,630,120 decompressed
{code}
[1] http://www.jcraft.com/jzlib/
> Speed up decoder for deflate64
> ------------------------------
>
> Key: COMPRESS-440
> URL: https://issues.apache.org/jira/browse/COMPRESS-440
> Project: Commons Compress
> Issue Type: Improvement
> Reporter: Dawid Weiss
> Priority: Minor
>
> With the buffer applied in COMPRESS-438 the decompression speed is actually
> quite all right, but there's still room for improvement. I was quite curious
> what the bounds for pure-java inflater would be and hacked a quick experiment
> with ZipFile using jzlib's implementation [1] to decompress a large-ish
> archive (openjdk8 repository).
> The results for deflate, deflate64 and java's built-in decompressor are below.
> {code}
> Java (Inflater):
> archive.zip 4.38 sec., 444,357,134 archived => 731,621,181 decompressed
> jzlib's pure-java inflater:
> archive.zip 6.65 sec., 444,357,134 archived => 731,621,181 decompressed
> current deflate64 in commons-compress (with my allocation-reducing patch):
> archive64.zip 11.35 sec., 443,209,798 archived => 731,630,120 decompressed
> {code}
> [1] http://www.jcraft.com/jzlib/
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