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Full Discussion: Getcwd performance issues
Operating Systems Solaris Getcwd performance issues Post 302821879 by Don Cragun on Saturday 15th of June 2013 11:50:55 PM
Old 06-16-2013
Quote:
Originally Posted by KotekBury
thanks for the suggestion but I can also reproduce it with a newly created folder:

Code:
>> mkdir test
>> cd test
>> truss -D pwd 2>&1 | grep getcwd
0.0001 getcwd("/opt_local/product/test", 1025) = 0
>> cd ..
>> mv test test1
>> cd test1
>> truss -D pwd 2>&1 | grep getcwd
0.2130 getcwd("/opt_local/product/test1", 1025) = 0
>> cd ..
>> mv test1 test
>> cd test
>> truss -D pwd 2>&1 | grep getcwd
 0.0001 getcwd("/opt_local/product/test", 1025) = 0

As soon as I rename it back to test1 it becomes slow again.
Session or shell change has no effect on it.
Of course. Renaming a directory or creating a new directory is exactly the same condition for this discussion; the shell is seeing a directory name that is not in its cache.
Quote:
Originally Posted by KotekBury
The same does not happen on a similar server with a different OS level
SunOS 5.10 Generic_147147-26 sun4u sparc SUNW,SPARC-Enterprise
As I said before, different shells may show different results. Even if the pathname of the shell you're using on the two servers is the same, there is no guarantee that the shell's processing remains the same from release to release. Changes in the OS itself or the filesystem type underlying the directories involved could also have a profound effect.
 

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PWD(1)							    BSD General Commands Manual 						    PWD(1)

NAME
pwd -- return working directory name SYNOPSIS
pwd [-L | -P] DESCRIPTION
The pwd utility writes the absolute pathname of the current working directory to the standard output. Some shells may provide a builtin pwd command which is similar or identical to this utility. Consult the builtin(1) manual page. The options are as follows: -L Display the logical current working directory. -P Display the physical current working directory (all symbolic links resolved). If no options are specified, the -P option is assumed. ENVIRONMENT
Environment variables used by pwd: PWD Logical current working directory. EXIT STATUS
The pwd utility exits 0 on success, and >0 if an error occurs. SEE ALSO
builtin(1), cd(1), csh(1), sh(1), getcwd(3) STANDARDS
The pwd utility conforms to IEEE Std 1003.1-2001 (``POSIX.1''). BUGS
In csh(1) the command dirs is always faster because it is built into that shell. However, it can give a different answer in the rare case that the current directory or a containing directory was moved after the shell descended into it. The -L option does not work unless the PWD environment variable is exported by the shell. BSD
April 12, 2003 BSD
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