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From:	Thorsten Kampe <thorsten AT thorstenkampe DOT de>
Subject:	Re: zsh hangs with "command not found" (Peter A. Castro?)
Date:	Sun, 12 Sep 2004 17:36:28 +0200
Lines:	61
Message-ID:	<cszwqqk2rtf7$.dlg@thorstenkampe.de>
References:	<2tmn14ipjsiu DOT dlg AT thorstenkampe DOT de>
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* Thorsten Kampe (2004-09-12 16:59 +0200)
> This is a follow-up to the thread "zsh 4.1.1-3 on W2000 hangs with
> command not found" from March 2004.
> 
> Facts:
> Cygwin 1.5.12s(0.116/4/2) 20040907 00:06:12
> zsh 4.2.0
> Windows XP SP2
> 
> Problem:
> zsh "hangs" about ten seconds when I try to execute a nonexistant
> command (bash in comparison returns immediately).
> 
> Even unsetting all environment variables inherited from Windows and
> deleting my .zshrc didn't make any difference.
> 
> Changes to march:
> Specifying an absolute path ('/bin/foobar') and unsetting 'correct'
> and 'correctall' make no difference anymore.
> 
> * Now I tried to analyze my problem with "File Monitor" from
> SysInternals. I captured two filtered sessions: one with zsh executing
> "foozsh" and one with bash executing "foobash" (both attached).
> 
> Things I noticed:
> bash queries 88 items while zsh queries 123. This shouldn't explain
> the ten second difference.
> 
> zsh spawns a new instance/process of zsh (pid 224) on line 29! Until
> this line the query results show up with no delay in "File Monitor".
> The next 98 lines show up with the ten second delay.
> 
> So either the starting of a new zsh instance/process is so terribly
> slow or the new zsh process searches (for whatever reason) much much
> slower than the first one.

I've examined the output further: it's in fact the creation of a new
process that takes the time. Compare these two snippets (one with
difference time and one with absolute clock time):

27	0.00002486	zsh.exe:3496	FASTIO_QUERY_OPEN	C:\foozsh.exe.lnk	FILE NOT FOUND	Attributes: Error
28	0.00002403	zsh.exe:3496	FASTIO_QUERY_OPEN	C:\foozsh.lnk	FILE NOT FOUND	Attributes: Error
29	0.00010951	zsh.exe:224	FASTIO_QUERY_OPEN	C:\cygwin\usr\local\bin\foozsh.exe	FILE NOT FOUND	Attributes: Error
30	0.00002486	zsh.exe:224	FASTIO_QUERY_OPEN	C:\cygwin\usr\local\bin\foozsh	FILE NOT FOUND	Attributes: Error
31	0.00002570	zsh.exe:224	FASTIO_QUERY_OPEN	C:\cygwin\usr\local\bin\foozsh.exe.lnk	FILE NOT FOUND	Attributes: Error

23	17:24:38	zsh.exe:2360	QUERY INFORMATION	C:\cygwin\home\thorsten\whereever.exe.lnk	FILE NOT FOUND	Attributes: Error
24	17:24:38	zsh.exe:2360	QUERY INFORMATION	C:\cygwin\home\thorsten\whereever.lnk	FILE NOT FOUND	Attributes: Error
25	17:24:49	zsh.exe:2360	QUERY INFORMATION	C:\whereever	FILE NOT FOUND	Attributes: Error
26	17:24:49	zsh.exe:2360	QUERY INFORMATION	C:\whereever.exe	FILE NOT FOUND	Attributes: Error
27	17:24:49	zsh.exe:2360	QUERY INFORMATION	C:\whereever.exe.lnk	FILE NOT FOUND	Attributes: Error
28	17:24:49	zsh.exe:2360	QUERY INFORMATION	C:\whereever.lnk	FILE NOT FOUND	Attributes: Error
29	17:24:49	zsh.exe:2764	QUERY INFORMATION	C:\cygwin\usr\local\bin\whereever.exe	FILE NOT FOUND	Attributes: Error
30	17:24:49	zsh.exe:2764	QUERY INFORMATION	C:\cygwin\usr\local\bin\whereever	FILE NOT FOUND	Attributes: Error

Interestingly File Monitor shows the delay always between line 28 and
29 when set to differential time (which is exactly the creation of a
new process) and between line 24 and 25 when set to "clock time"
(maybe a bug?)	

Thorsten


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