[COMPRESS-234] Patch: TAR InputStream Huge Speed Improvements

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.6
• Component/s: Archivers
• Assignee: Unassigned
• Reporter: David Mollitor
• Created: 10/Jul/13 01:38
• Updated: 10/Dec/13 12:37
• Resolved: 08/Aug/13 15:58

Description

I have looked over TarBuffer And TarArchiveInputStream and found some ways to improve performance orders of magnitude.

I used a 1 GB TAR archive file (no compression).

Times for reading all entry file names:
Current - 630ms
Mine - 17ms

Times for extracting all entry files:
Current 2446ms
Mine - 2214ms

As you can see, I have enhanced the "skip" methods greatly. Actual extraction was within a margin of error and the timings bounces around a lot.

Issue Links

• breaks: COMPRESS-249 TarArchiveInputStream does not properly read from underlying InputStream
• is duplicated by: COMPRESS-233 Microbenchmarking TarBuffer#isEOFRecord
• relates to: COMPRESS-233 Microbenchmarking TarBuffer#isEOFRecord