[LUCENE-1119] Optimize TermInfosWriter.add

• Type: Improvement
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 2.3
• Component/s: core/index
• Lucene Fields: New
• Assignee: Michael McCandless
• Reporter: Michael McCandless
• Created: 05/Jan/08 11:06
• Updated: 28/Aug/22 11:44
• Resolved: 06/Jan/08 19:29

Description

I found one more optimization, in how terms are written in
TermInfosWriter. Previously, each term required a new Term() and a
new String(). Looking at the cpu time (using YourKit), I could see
this was adding a non-trivial cost to flush() when indexing Wikipedia.

I changed TermInfosWriter.add to accept char[] directly, instead.

I ran a quick test building first 200K docs of Wikipedia. With this
fix it took 231.31 sec (best of 3) and without the fix it took 236.05
sec (best of 3) = ~2% speedup.