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Full Discussion: Getcwd performance issues
Operating Systems Solaris Getcwd performance issues Post 302821689 by KotekBury on Saturday 15th of June 2013 08:01:50 AM
Old 06-15-2013
Getcwd performance issues

Hello everyone,
recently we have been experiencing performance issues with chmod. We managed to narrow it down to getcwd.

Code:
The following folder exists:
 /Folder1/subfol1/subfol2/subfol3

cd /Folder1/subfol1/subfol2/subfol3 

truss -D pwd 2>&1 | grep getcwd
 0.0001 getcwd("/folder1/subfol1/subfol2/subfol3", 1025) = 0

-- rename subfol3 to subfol4
cd ..
mv subfol3 subfol4

-enter new folder and analyze pwd

cd subfol4
truss -D pwd 2>&1 | grep getcwd
 0.2789 getcwd("/folder1/subfol1/subfol2/subfol4", 1025) = 0

-- rename to the original name
cd ..
mv subfol4 subfol3
cd subfol3

-- analyze pwd
truss -D pwd 2>&1 | grep getcwd
 0.0001 getcwd("/folder1/subfol1/subfol2/subfol3", 1025) = 0

Question: why is there a difference in a response time after renaming the folder ?

Code:
uname -a
SunOS algenib 5.10 Generic_147440-19 sun4u sparc SUNW,SPARC-Enterprise


Last edited by Scott; 06-15-2013 at 09:30 AM.. Reason: Please use code tags
 

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getcwd(3)						     Library Functions Manual							 getcwd(3)

Name
       getcwd - get pathname of working directory

Syntax
       char I**getcwd (buf, size)
       char I**buf;
       int size;

Description
       The  subroutine returns a pointer to the current directory pathname.  The value of size must be at least two greater than the length of the
       pathname to be returned.

       If buf is a NULL pointer, will obtain size bytes of space using In this case, the pointer returned by may be used as the argument in a sub-
       sequent call to free.

       The function is implemented by using to pipe the output of the command into the specified string space.

Examples
       char *cwd, *getcwd();
       .
       .
       .
       if ((cwd = getcwd((char *)NULL, 64)) == NULL) {

	    perror("pwd");
	    exit(1);
       }
       printf("%s
", cwd);

Return Values
       Returns NULL with errno set if size is not large enough, or if an error occurs in a lower-level function.

Diagnostics
       [EINVAL]       The size argument is zero or negative.

       [ERANGE]       The size argument is greater than zero, but is smaller than the length of the pathname+1;

       [EACCES]       Read or search permission is denied for a component of the pathname.

       [ENOMEM]       Insufficient storage space is available.

See Also
       pwd(1), malloc(3), popen(3)

																	 getcwd(3)
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