MAWK
Mawk (Mike's AWK) is an interpreter for the AWK Programming Language.
| Tags | Software Development Interpreters |
|---|---|
| Licenses | GPLv2 |
| Implementation | Awk |
Recent releases
- 26 Jun 2010 09:09
Release Notes: Bugfixes for the interface to the system regular expression library and new RPM and Debian package scripts.
- 08 May 2010 09:42
Release Notes: A regression in the "delete" operation was fixed. Strict compiler warnings were cleaned up for 64-bit platforms.
- 20 Apr 2010 03:00
Release Notes: Parsing of the -W option was modified to make it more useful in the #-line of scripts. A port to OpenSolaris was made. There were many fixes and improvements for built-in regular expressions.
- 20 Dec 2009 23:29
Release Notes: This consolidates changes in the last set of releases, porting those to a variety of new platforms (vendor Unix, Cygwin, and MinGW). Several changes are made to the floating point configure and runtime to achieve this.
- 21 Sep 2009 01:18
Release Notes: This release supports nulls in the field-separator pattern. It improves the performance of associative arrays via a new hashing function. It has other fixes/improvements.
Recent comments
As a regular mawk user, I use it for lots of data slicing & dicing - I noticed that when the hash table become enormous (millions of entries), that the performance is very slow - I surmised that the hash function was having lots of collisions, thus made some changes to a modern hash function while I was trapped in a slow meeting.
In hash.c I replaced the 'hash' function with:
/*
FNV-1 hash function,
per en.wikipedia.org/wiki/...
*/
unsigned
hash(s)
register char *s ;
{
register unsigned h = 2166136261 ;
while (*s) h = (h * 16777619) ^ *s++ ;
return h ;
}
and in array.c replaced 'ahash' with:
/*
FNV-1 hash function,
per en.wikipedia.org/wiki/...
*/
static unsigned ahash(sval)
STRING* sval ;
{
register unsigned h = 2166136261 ;
register char *s = sval->str;
while (*s) h = (h * 16777619) ^ *s++ ;
return h ;
}
Will send benchmark results later, when I run it on an unloaded system.
tedickey
01 Apr 2002 19:16
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