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| From | Chet Ramey <chet.ramey@case.edu> |
| Newsgroups | gnu.bash.bug |
| Subject | Re: [PATCH 5.1] zread: read files in 4k chunks |
| Date | Mon, 22 Jun 2020 17:07:27 -0400 |
| Organization | ITS, Case Western Reserve University |
| Lines | 22 |
| Approved | bug-bash@gnu.org |
| Message-ID | <mailman.295.1592860057.2574.bug-bash@gnu.org> (permalink) |
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| To | Ilkka Virta <itvirta@iki.fi>, "Jason A. Donenfeld" <Jason@zx2c4.com>, bug-bash@gnu.org |
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On 6/22/20 4:16 PM, Ilkka Virta wrote: > On 22.6. 19.35, Chet Ramey wrote: >> On 6/22/20 1:53 AM, Jason A. Donenfeld wrote: >>> Currently a static sized buffer is used for reading files. At the moment >>> it is extremely small, making parsing of large files extremely slow. >>> Increase this to 4k for improved performance. >> >> I bumped it up to 1024 initially for testing. > > It always struck me as odd that Bash used such a small read of 128 bytes. > Most of the GNU utils I've looked at on Debian use 8192, and a simple test > program seems to indicate glibc's stdio reads 4096 bytes at one read() call. Yes, 128 is too small for modern systems. It made more sense when the code was written. -- ``The lyf so short, the craft so long to lerne.'' - Chaucer ``Ars longa, vita brevis'' - Hippocrates Chet Ramey, UTech, CWRU chet@case.edu http://tiswww.cwru.edu/~chet/
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Re: [PATCH 5.1] zread: read files in 4k chunks Chet Ramey <chet.ramey@case.edu> - 2020-06-22 17:07 -0400
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