Re: first mkdir takes a long time (on ext3)

[Hartmut Niemann <Hartmut.Niemann@gmx.de>]

Hello Karl, hello everybody,

thank you Karl for this script.

Am So Mai 22 2011 schrieb Karl Vogel:
> >> On 19/05/11 17:01, Hartmut Niemann wrote:
> H> It often takes very long time (20s) to mkdir on an ext3 drive
> 
> 
>    Try this version of mkdir earlier in your PATH until you find out what
>    the delay is.
> 
>      you% mkdir /tmp/mkdir
>      you% chmod 1777 /tmp/mkdir
> 
>      you% cat /usr/local/bin/mkdir
>      #!/bin/sh
>      tfile=$(date '+%Y%m%d%H%M%S')
>      exec /usr/bin/strace -r -o /tmp/mkdir/$tfile /bin/mkdir ${1+"$@"}
>      exit 1
> 
> 
I did not succed to reproduce my problem on my older computer, but
I caught one on my new computer
$ uname -a
Linux Squeeze 2.6.32-5-686 #1 SMP Tue Mar 8 21:36:00 UTC 2011 i686 GNU/Linux

[... lots of lines deleted ]
     0.000037 mmap2(NULL, 1527680, PROT_READ, MAP_PRIVATE, 3, 0) = 0xb74df000
     0.000021 close(3)                  = 0
     0.000039 mkdir("one", 0777)        = 0
    83.683130 close(1)                  = 0
     0.000029 close(2)                  = 0

It looks like mkdir itself takes so long. Everything else was well below 1 ms.

This looks interesting...

Hartmut