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[Grep-devel] NEWS update re performance improvements
From: |
Jim Meyering |
Subject: |
[Grep-devel] NEWS update re performance improvements |
Date: |
Sat, 13 Oct 2018 21:46:22 -0700 |
Better late than never.
Ideally, we would update NEWS in each corresponding commit.
>From c5c3b2ef023f996d0a80c8380945804a7575680a Mon Sep 17 00:00:00 2001
From: Jim Meyering <address@hidden>
Date: Sat, 13 Oct 2018 21:42:29 -0700
Subject: [PATCH] doc: NEWS: mention performance improvements
* NEWS (Improvements): Mention them.
---
NEWS | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/NEWS b/NEWS
index 084aa1c..4a8b4b8 100644
--- a/NEWS
+++ b/NEWS
@@ -15,6 +15,14 @@ GNU grep NEWS -*- outline
-*-
** Improvements
+ An over-30x performance improvement when many 'or'd expressions
+ share a common prefix, thanks to improvements in gnulib's dfa.c,
+ by Norihiro Tanaka. See gnulib commits v0.1-2110-ge648401be,
+ v0.1-2111-g4299106ce, v0.1-2117-g617a60974
+
+ An additional 3-23% speed-up when searching large files, via
+ increased initial buffer size.
+
grep now diagnoses stack overflow. Before grep-2.6, the included
regexp code would detect it. Since 2.6, grep defaulted to using
glibc's regexp, which lost that capability.
--
2.18.0
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