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Re: Why does not rgrep use "grep -r"?
From: |
Eli Zaretskii |
Subject: |
Re: Why does not rgrep use "grep -r"? |
Date: |
Sat, 03 Nov 2007 13:01:55 +0200 |
> From: David Kastrup <address@hidden>
> Cc: Miles Bader <address@hidden>, address@hidden, address@hidden,
> address@hidden
> Date: Sat, 03 Nov 2007 10:43:03 +0100
>
> Totally warm cache:
>
> address@hidden:/usr/local/texlive/2007$ time find -name \*.tex|xargs grep
> snort
> ./texmf-dist/source/latex/ae/aesample.tex:and whooping and sneezing and
> snorting, that I could not hear myself think for
>
> real 0m0.974s
> user 0m0.372s
> sys 0m0.536s
> address@hidden:/usr/local/texlive/2007$ time grep -r --include=\*.tex snort .
> ./texmf-dist/source/latex/ae/aesample.tex:and whooping and sneezing and
> snorting, that I could not hear myself think for
>
> real 0m1.225s
> user 0m0.376s
> sys 0m0.764s
> [...]
> On a warm cache, it is pretty much the same.
Perhaps for the Linux filesystem, it is. It looks as it's quite
different on Windows:
With warm cache:
timep grep -r snort d:/gnu/gdb-CVS/src/gdb > nul
real 00h00m03.171s
user 00h00m00.234s
sys 00h00m02.312s
timep find d:/gnu/gdb-CVS/src/gdb -name "*.c" | xargs grep snort > nul
real 00h00m03.921s
user 00h00m00.015s
sys 00h00m00.015s
That's a 20% difference in elapsed time (the fact that user and sys
are zero is just an artefact of the timep command implementation on
Windows).
With cold cache:
timep grep -r snort d:/gnu/gdb-CVS/src/gdb > nul
real 00h00m15.531s
user 00h00m00.328s
sys 00h00m03.140s
timep find d:/gnu/gdb-CVS/src/gdb -name "*.c" | xargs grep snort > nul
real 00h00m13.687s
user 00h00m00.015s
sys 00h00m00.078s
That's 11%, a much smaller gain, and in the other direction.
- Why does not rgrep use "grep -r"?, Lennart Borgman (gmail), 2007/11/02
- Re: Why does not rgrep use "grep -r"?, Miles Bader, 2007/11/02
- Re: Why does not rgrep use "grep -r"?, Andreas Schwab, 2007/11/02
- Re: Why does not rgrep use "grep -r"?, Lennart Borgman (gmail), 2007/11/02
- Re: Why does not rgrep use "grep -r"?, Miles Bader, 2007/11/02
- Re: Why does not rgrep use "grep -r"?, Lennart Borgman (gmail), 2007/11/02
- Re: Why does not rgrep use "grep -r"?, Miles Bader, 2007/11/02
- Re: Why does not rgrep use "grep -r"?, Eli Zaretskii, 2007/11/03
- Re: Why does not rgrep use "grep -r"?, David Kastrup, 2007/11/03
- Re: Why does not rgrep use "grep -r"?,
Eli Zaretskii <=
- Re: Why does not rgrep use "grep -r"?, Lennart Borgman (gmail), 2007/11/03
- Re: Why does not rgrep use "grep -r"?, David Kastrup, 2007/11/04
- Re: Why does not rgrep use "grep -r"?, Eli Zaretskii, 2007/11/05
- Re: Why does not rgrep use "grep -r"?, Ken Raeburn, 2007/11/03
- Re: Why does not rgrep use "grep -r"?, Eli Zaretskii, 2007/11/03
- Re: Why does not rgrep use "grep -r"?, Eli Zaretskii, 2007/11/03
Re: Why does not rgrep use "grep -r"?, Stefan Monnier, 2007/11/03
Re: Why does not rgrep use "grep -r"?, Kim F. Storm, 2007/11/03