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Re: bash hash bug


From: Chet Ramey
Subject: Re: bash hash bug
Date: Tue, 21 Nov 2006 09:15:11 -0500
User-agent: Thunderbird 1.5.0.8 (Macintosh/20061025)

Bob Proulx wrote:

>> Chet Ramey wrote:
>>> When this option is on, bash has to check the hashed filename for
>>> each hash lookup.  This essentially causes the hash entry to be
>>> deleted and re-added each time, which resets the number of hits to 1.
>>> (It could probably be done without the deletion and re-addition; I
>>> should look at that.)

I looked, and it can.  So performance will improve slightly, since there
doesn't need to be a redundant path search, and the `hit count', which is
just a coarse estimate of hashing effectiveness, will be more meaningful.

It was a bug, or at least a case of code no longer working as originally
intended.

Chet
-- 
``The lyf so short, the craft so long to lerne.'' - Chaucer
                       Live Strong.  No day but today.
Chet Ramey, ITS, CWRU    address@hidden    http://cnswww.cns.cwru.edu/~chet/




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