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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 SUSE

ncopy

NCOPY(1)							       ncopy								  NCOPY(1)

NAME

       ncopy - NetWare file copy

SYNOPSIS

       ncopy -V

       ncopy [ -vmMnpptu ] [ -s amount ] file destinationfile|directory

       ncopy [ -vmMnpptu ] [ -s amount ] file1 [ file2 ... ] directory

       ncopy -r [ -vmMnpptu ] [ -s amount ] srcdir dstdir

DESCRIPTION

       With  ncopy  you can copy files to different locations on a single NetWare file server without generating excess network traffic.  The pro-
       gram uses a NetWare function to do the copy rather than transferring the file across the network for both the read and write.

       If the last argument is a directory, ncopy will copy the source file(s) into the directory.  If only two files are given and the last argu-
       ment is not a directory, it will copy the source file to the destination file.

       If  the source and destination files are not on the same NetWare server (or are not on NetWare servers at all), ncopy will do a normal file
       copy.

OPTIONS

       -V
	  Show version number and exit

       -v
	  Verbose copy.  Will show current file and percentage completion.

       -m
	  Copy MAC resource fork. Copies MAC resource fork together with data fork.

       -M
	  Copy MAC resource fork to/from non-MAC filesystem. It expects/creates resource forks in subdirectory .rsrc of each directory copied.

	  If you want to copy files from MAC volume to .rsrc scheme, you must specify both options, -mM. It is not possible to create .rsrc direc-
	  tory on MAC-aware volume in one step, you must first copy data to non-MAC media using ncopy -mM and then copy them back using ncopy -M.

	  If  you want to copy files from .rsrc scheme on MAC volume to real MAC multiple-forks file, you must first copy data to non-MAC filesys-
	  tem using ncopy -M and then copy them back using ncopy -mM.

       -n
	  Nice NetWare copy.  Will sleep for a second between copying blocks on the NetWare server.  Gives other people a chance to do	some  work
	  on the NetWare server when you are copying large files.  This has no effect if you are not copying on a NetWare server.

       -s amount
	  Nice	time  slice  factor.   Used  in  conjunction with the -n option, this specifies the number of 100K blocks to copy before sleeping.
	  Default is 10. (1 Megabyte)

       -p
	  Preserve file attributes and date/time during copy.

       -pp
	  Preserve file attributes, date/time and owner during copy. Name of owner is preserved, not owner ID.

       -t
	  Preserve trustees during copy. Trustee name is preserved, not ID.

       -r
	  Perform recursive copy.

       -u
	  Perform copy only if mtime or size differs.

BUGS

       ncopy does not preserve long (MAC, NFS, FTAM, OS2) names during copy.

SEE ALSO

       ncpmount(8), ncpumount(8)

CREDITS

       ncopy was written by  Brian  G.	Reid  (breid@tim.com)  and  Tom  C.  Henderson	(thenderson@tim.com).	Many  thanks  to  Volker  Lendecke
       (lendecke@math.uni-goettingen.de)  for  the  ncpfs and ncplib which made ncopy possible. Some further work was done by Petr Vandrovec (van-
       drove@vc.cvut.cz).

ncopy								    17/03/1996								  NCOPY(1)