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Copy files in Multiple Threads

 
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Old 02-18-2010
Question Copy files in Multiple Threads
Hello all,

I have a directory of files of varying sizes.

I want to copy all these files in n number of threads to another directory such that each

copy set is more or less the same size.

Example :

Say /mydirA

It has around say 23 files of various sizes.

Number of copy threads say = 3

total directory size of /mydirA = 25 GB

So each thread should copy files whose sizes add up to almost 25/3 ~ 8 GB

So need to gather files based on the size for each thread such that they add upto 8GB

Thread 1 --> 8GB ..could be 11 files which add up to 8 gb

Thread 2 -->8 Gb ... couldbe 5 files which add up to 8 gb

Thread 3 ---> 9GB ...could be 8 files which add up to 8 or 9 gb

Want roughly equal copy set threads. It is also possible that even though I select 3 threads of equal size because of lack of number of files not all 3 threads could satisy the 8gb copy set size. So atleast try to fulfill the copy set thread size as far as possible.

All files need to go from /mydirA to /mydirB in N threads bases on the size of each thread as
(Total size of directory)/N which could have different number of files in each thread based on size to add up to the individual copy thread size
 
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LEARN ABOUT SUNOS

install

install(1B)					     SunOS/BSD Compatibility Package Commands					       install(1B)

NAME

       install - install files

SYNOPSIS

       /usr/ucb/install [-cs] [-g group] [-m mode] [-o owner] filename1 filename2

       /usr/ucb/install [-cs] [-g group] [-m mode] [-o owner] filename... directory

       /usr/ucb/install -d [-g group] [-m mode] [-o owner] directory

DESCRIPTION

       install is used within makefiles to copy new versions of files into a destination directory and to create the destination directory itself.

       The first two forms are similar to the cp(1) command with the addition that executable files can be stripped during the copy and the owner,
       group, and mode of the installed file(s) can be given.

       The third form can be used to create a destination directory with the required owner, group and permissions.

       Note: install uses no special privileges to copy files from one place to another. The implications of this are:

	 o  You must have permission to read the files to be installed.

	 o  You must have permission to copy into the destination file or directory.

	 o  You must have permission to change the modes on the final copy of the file if you want to use the -m option to change modes.

	 o  You must be superuser if you want to specify the ownership of the installed file with -o. If you are not the super-user, or if  -o	is
	    not in effect, the installed file will be owned by you, regardless of who owns the original.

OPTIONS

       -c	       Copy  files.  In fact install always copies files, but the -c option is retained for backwards compatibility with old shell
		       scripts that might otherwise break.

       -d	       Create a directory. Missing parent directories are created as required as in mkdir -p. If the directory already exists, the
		       owner, group and mode will be set to the values given on the command line.

       -s	       Strip executable files as they are copied.

       -g group        Set the group ownership of the installed file or directory. (staff by default.)

       -m mode	       Set the mode for the installed file or directory. (0755 by default.)

       -o owner        If run as root, set the ownership of the installed file to the user-ID of owner.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWscpu			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       chgrp(1), chmod(1), chown(1), cp(1), mkdir(1), strip(1), install(1M), attributes(5)

SunOS 5.10							    14 Sep 1992 						       install(1B)