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Date: Wed, 16 Apr 2008 14:48:40 +1000
From: Luke Kendall <luke DOT kendall AT cisra DOT canon DOT com DOT au>
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To: cygwin AT cygwin DOT com
Subject: Re: Possible Defect: Long delay in some progam executions
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Gregory Rosensteel wrote:
> Hello,
>   I performed a fresh install of cygwin on windows XP. I am seeing
> that some commands take a really long time to execute, I was wondering
> if anyone else is experience this.  For example, the 'which' command
> takes 2s while the 'pwd' command runs just fine. Please see my sample
> output below and if you have encountered this before, let me know
> what's up!
>
>
> $ time which
> Usage: which [options] [--] COMMAND [...]
> Write the full path of COMMAND(s) to standard output.
>
>   --version, -[vV] Print version and exit successfully.
>   --help,          Print this help and exit successfully.
>   --skip-dot       Skip directories in PATH that start with a dot.
>   --skip-tilde     Skip directories in PATH that start with a tilde.
>   --show-dot       Don't expand a dot to current directory in output.
>   --show-tilde     Output a tilde for HOME directory for non-root.
>   --tty-only       Stop processing options on the right if not on tty.
>   --all, -a        Print all matches in PATH, not just the first
>   --read-alias, -i Read list of aliases from stdin.
>   --skip-alias     Ignore option --read-alias; don't read stdin.
>   --read-functions Read shell functions from stdin.
>   --skip-functions Ignore option --read-functions; don't read stdin.
>
> Recommended use is to write the output of (alias; declare -f) to standard
> input, so that which can show aliases and shell functions. See which(1) for
> examples.
>
> If the options --read-alias and/or --read-functions are specified then the
> output can be a full alias or function definition, optionally followed by
> the full path of each command used inside of those.
>
> Report bugs to <which-bugs AT gnu DOT org>.
>
> real    0m2.082s
> user    0m0.030s
> sys     0m0.000s
>
> Greg AT laptop1 ~
> $ time pwd
> /home/Greg
>
> real    0m0.001s
> user    0m0.000s
> sys     0m0.000s
>
>
>   

pwd is a shell built-in, "which" must be searched for along your $PATH.
You could check if any of the early paths in $PATH are network shares 
(which would obviously be slower).  It gets especially bad if some of 
those network shares drop off the network - you have to wait for a 
timeout, to proceed to the next $PATH element.

luke

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