bugGNU Octave - Bugs: bug #39430, regexp: performance for cell...


bug #39430: regexp: performance for cell arrays is slow

Submitted by:  Rik <rik5>
Submitted on:  Sun 07 Jul 2013 11:55:02 PM UTC  
Category: LibrariesSeverity: 3 - Normal
Priority: 5 - NormalItem Group: Performance
Status: ConfirmedAssigned to: None
Originator Name: Open/Closed: Open
Release: devOperating System: Any

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Mon 21 Nov 2016 10:17:37 PM UTC, comment #1:

This issue is still present in Octave 4.2.0.

Hartmut <hardy>
Sun 07 Jul 2013 11:55:02 PM UTC, original submission:

The performance of regexp is an order of magnitude slower than the same functionality in strfind. Some performance penalty is expected, but not this great.

Sample Code:

There seem to be several causes. It appears that Octave is re-compiling the PCRE pattern every time it does a match for one row. Octave is also bothering to process and restore all possible return values (start, end, tokens, tokenextents, match, and splits) even if only a subsection is desired. I haven't done a hotspot analysis though.

Rik <rik5>
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