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From: Bart Schaefer <schaefer@brasslantern.com>
Message-Id: <150428093435.ZM30556@torch.brasslantern.com>
Date: Tue, 28 Apr 2015 09:34:35 -0700
In-Reply-To: <20150428151950.GB4973@ypig.lip.ens-lyon.fr>
Comments: In reply to Vincent Lefevre <vincent@vinc17.net>
        "Re: Filename generation: sorting by inode number" (Apr 28,  5:19pm)
References: <20150425001719.GA12262@xvii.vinc17.org> 
	<CAHYJk3TqVJHja61ADBqfH228Q5ZchSCcO1_Bi=Y8g5uW8Q=Kdg@mail.gmail.com> 
	<150425111451.ZM32010@torch.brasslantern.com> 
	<20150428151950.GB4973@ypig.lip.ens-lyon.fr>
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Subject: Re: Filename generation: sorting by inode number
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[Sorry for the long context / short reply below]

On Apr 28,  5:19pm, Vincent Lefevre wrote:
}
} $ sudo drop-caches && time grep -q zzz 1000*(oN)
} grep -q zzz 1000*(oN)  0.03s user 0.32s system 0% cpu 40.726 total
} 
} $ sudo drop-caches && time grep -q zzz 1000*(noe:'zstat -L -A REPLY +inode $REPLY:')
} grep -q zzz 1000*(noe:'zstat -L -A REPLY +inode $REPLY:')  0.06s user 0.14s system 12% cpu 1.590 total
} 
} but "oc" is slower (confirmed by 3 tests each), even though the files
} have been created with no inode change, e.g.:
} 
} $ sudo drop-caches && time grep -q zzz 1000*(oc)
} grep -q zzz 1000*(oc)  0.01s user 0.19s system 7% cpu 2.589 total
} 
} The probable cause is the low ctime resolution (1 second?).

Looks like (oc) is significantly faster than (oN), though, even though it
is slower than (o+byinode).  So it may be a reasonable compromise.