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Subject: Re: man incredibly slow because it scans for share directory in PATH??
To: cygwin AT cygwin DOT com
References: <19074b1d-78d1-a425-5a79-434ce8b1d480 AT kit DOT edu> <310054882 DOT 20160612134916 AT yandex DOT ru>
From: "Riedel,Till (TM)" <till DOT riedel AT kit DOT edu>
Message-ID: <1c58d754-9720-0780-6f5e-76edc056b480@kit.edu>
Date: Sun, 12 Jun 2016 15:30:09 +0200
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 > You have lots of duplicated, obsolete and overlapping paths in your 
%PATH%.
 > I suggest you start from some homecleaning.
 > Not to mention strange ones, like "/".

Thx alot!

I know that my path is messy, but having "/" in the path should not be 
all too fatal.

Furthermore, I probably did not set any of those strange paths myself 
(this is afterall Windows ;) ).

@Eliot: Good idea to set MANPATH!

 >MANPATH=/usr/share/man PATH="/usr/bin:/foo" strace man bar |grep 
'foo/share'

returns nothing and fixes the issue!

IMHO at least in Windows/Cygwin creating MANPATH from PATH makes no 
sense! (although I now get the idea what was the rationell!) Reasonably 
setting MANPATH should IMHO be a default...

BR

Till


Am 6/12/2016 um 12:49 PM schrieb Andrey Repin:
> Greetings, Riedel,Till (TM)!
>
>> I traced down my problem with really slow man page views this:
>
>> {{{
>
>  >>PATH="/usr/bin:/foo" strace man bar |grep 'foo/share'
>
>> }}}
>
>> I am getting this:
>
>> {{{
>
>>     13   39756 [main] man 6688 normalize_posix_path: src /foo/share/man
>>     16   39772 [main] man 6688 normalize_posix_path: /foo/share/man =
>> normalize_posix_path (/foo/share/man)
>>     13   39785 [main] man 6688 mount_info::conv_to_win32_path:
>> conv_to_win32_path (/foo/share/man)
>>     12   39810 [main] man 6688 mount_info::conv_to_win32_path: src_path
>> /foo/share/man, dst C:\tools\cygwin\foo\share\man, flags 0x3000A, rc 0
>>     16   39912 [main] man 6688 mount_info::conv_to_win32_path:
>> conv_to_win32_path (/foo/share)
>>     14   39942 [main] man 6688 mount_info::conv_to_win32_path: src_path
>> /foo/share, dst C:\tools\cygwin\foo\share, flags 0x3000A, rc 0
>
>> }}}
>
>> If my PATH is the real one this goes on forever, and generates some
>> problems,like:
>
> You have lots of duplicated, obsolete and overlapping paths in your %PATH%.
> I suggest you start from some homecleaning.
> Not to mention strange ones, like "/".
>
>> {{{
>
>  >>time man bar
>> No manual entry for bar
>
>> real    0m23.650s
>> user    0m0.000s
>> sys     0m0.108s
>
>> hanging e.g. on
>
>>     20 2449004 [main] man 8124 mount_info::conv_to_win32_path: src_path
>> //share/man, dst \\share\man, flags 0x4022, rc 0
>
>> }}}
>
>> VS.
>
>> {{{
>
>  >>PATH=/usr/bin/ bash -c "time man bar"
>> No manual entry for bar
>
>> real    0m0.082s
>> user    0m0.031s
>> sys     0m0.045s
>
>> }}}
>
>> Any ideas why man does look for "share" in the whole path? Tbh I haven't
>> looked at the man source code. Thx in advance!
>
>

-- 
KIT- Research University in the Helmholtz Association

Dr.-Ing. Till Riedel
Lab Leader TECO, SDSC-BW/SDIL

Karlsruhe Institute of Technology (KIT)
Institute of Telematics (TM)
Pervasive Computing Systems - Prof. Beigl


Bldg. 07.07., Room 211
Vincenz Prießnitz Str. 1, 76131 Karlsruhe

+49 (0)721 608 41706
www.teco.kit.edu/~riedel

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