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

From: Ilkka Virta
Subject: Re: [PATCH 5.1] zread: read files in 4k chunks
Date: Mon, 22 Jun 2020 23:16:40 +0300
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.13; rv:68.0) Gecko/20100101 Thunderbird/68.9.0

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

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