Re: [PATCH 5.1] zread: read files in 4k chunks

From	Ilkka Virta <itvirta@iki.fi>
Newsgroups	gnu.bash.bug
Subject	Re: [PATCH 5.1] zread: read files in 4k chunks
Date	2020-06-22 23:16 +0300
Message-ID	<mailman.287.1592857014.2574.bug-bash@gnu.org> (permalink)
References	<20200622055328.155106-1-Jason@zx2c4.com> <3cac1f66-697d-396d-3dc8-fc5b621638a4@case.edu> <271ebec9-fe1f-7823-a236-2e734657a279@iki.fi>

Show all headers | View raw

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.

-- 
Ilkka Virta / itvirta@iki.fi

Back to gnu.bash.bug | Previous | Next | Find similar | Unroll thread

Thread

Re: [PATCH 5.1] zread: read files in 4k chunks Ilkka Virta <itvirta@iki.fi> - 2020-06-22 23:16 +0300

csiph-web