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From: "Buchbinder, Barry (NIH/NIAID) [E]" <BBuchbinder AT niaid DOT nih DOT gov>
To: "cygwin AT cygwin DOT com" <cygwin AT cygwin DOT com>
CC: "'Byron Boulton'" <daytonb AT zoho DOT com>
Subject: RE: locate and updatedb
Date: Wed, 17 Feb 2016 16:00:49 +0000
Message-ID: <6CF2FC1279D0844C9357664DC5A08BA21BD31EAE@msgb09.nih.gov>
References: <56BC940F DOT 6070109 AT zoho DOT com> <56BCD05C DOT 2040409 AT gmail DOT com> <56BCD414 DOT 2010304 AT zoho DOT com> <56BD0D87 DOT 6030008 AT gmail DOT com> <56BF1E4D DOT 5000901 AT tlinx DOT org> <6CF2FC1279D0844C9357664DC5A08BA21BD2FA07 AT msgb09 DOT nih DOT gov> <56C478E0 DOT 70904 AT zoho DOT com>
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Byron Boulton sent the following at Wednesday, February 17, 2016 8:43 AM
>On 2/16/2016 5:55 PM, Buchbinder, Barry (NIH/NIAID) [E] wrote:
>>
>> This is technically OT since this involved a non-cygwin tool.
>>
>> find is slow compared with a non-Cygwin tool, specifically dir (cmd.exe).
>>
>> Compare find with cmd.exe's dir.  Note that even with the benefit of
>> caching (compare the 1st and 3rd times), find takes twice as long as dir.
>> Comparing cached times (2nd vs 3rd), dir is 3X faster.
>>
>> $ time cmd /c dir /s /b 'C:\usr' > /dev/null ; \ time find /c/usr >
>> /dev/null ; \ time cmd /c dir /s /b 'C:\usr' > /dev/null
>>
>> real    0m1.326s
>> user    0m0.000s
>> sys     0m0.047s
>>
>> real    0m2.465s
>> user    0m0.280s
>> sys     0m2.184s
>>
>> real    0m0.874s
>> user    0m0.000s
>> sys     0m0.031s
>>
>> (Note: c:\usr has nothing to do with /usr.)
>>
>> Here's how I use dir *in the abstract* for drives C: and D:.  (Note:
>> the
>> /a: option of dir lists all files, including hidden ones; /o:n sorts
>> by
>> name.)
>>
>> for D in /c /d
>> do
>>      "$(cygpath "${COMSPEC}")" /c dir /s /b /a: /o:n "$(cygpath -w "$D")"
>> done | \
>> tr -s '\r\n' '\n' | \
>> cygpath -u -f - | \
>> sed -e '/^$/d' -e 's,/\+,/,g' \
>> sort -u \
>> /usr/libexec/frcode > /tmp/updatedb.tmp chmod --reference
>> /var/locatedb /tmp/updatedb.tmp mv /tmp/updatedb.tmp /var/locatedb
>>
>> What I actually do (attached) is more complicated.  My script chooses
>> which directories are scanned, does them in parallel, and prints
>> pretty messages.  I get error messages for very long paths (> ~250
>> bytes).  It works well enough for me; YMMV.
>
>Are you using dir in some sort of custom way to build the database
>used by locate? Or are you saying that rather than ever using the find
>command to find files, you use a custom script which uses dir?

I use dir only to generate the locate database, because scanning the
better part of several disks takes so long.  I do not substitute dir for
find for other purposes.  One could, but usually locate does what I need,
and when it doesn't, I use find.

Best wishes,

- Barry
  Disclaimer: Statements made herein are not made on behalf of NIAID.

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