On 2/3/24 3:29 PM, Casey Johnson wrote:
Bash Version: 5.1 Patch Level: 16 Release Status: releaseDescription: The current implementation of the command history takes a long time to load a large HISTFILE when history is stifled. This is because there is a memmove() for every line of HISTFILE once HISTSIZE lines have been loaded. If N is the number of lines in HISTFILE then the cost of the memmoves ends up being something like (N - HISTSIZE) * HISTSIZE, peaking when HISTSIZE is roughly N/2.
Thanks for the report and the patch. I applied it with some tweaks and
saw a dramatic performance improvement for very large history files (I
tested with one that was about 690000 entries) where HISTSIZE is
significantly smaller (I tested with HISTSIZE=100000): from around 11
seconds to less than 0.3 seconds.
Chet
--
``The lyf so short, the craft so long to lerne.'' - Chaucer
``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU c...@case.edu http://tiswww.cwru.edu/~chet/
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