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Full Discussion: Fastest way calculating directory
Top Forums Shell Programming and Scripting Fastest way calculating directory Post 302868163 by jim mcnamara on Saturday 26th of October 2013 08:41:35 AM
Old 10-26-2013
Short answer for df: no.
A not so great answer to using du:

You can run du parallel. It is still going to take a very long time.
Assume all of your directories live on two mountpoints (directories): dira and dirb
Code:
cnt=0
> /tmp/summary_sizes.txt   # set the file to zero length
find /dira /dirb -type d | while read dirname 
do
     du -s $dirname >> /tmp/summary_sizes.txt &   # run du in the background
     cnt=$(( $cnt + 1 ))                                          # count background processes
     [  $(( $cnt % 15 )) -eq 0 ]  && wait                   # when 15 active -- wait
done
wait                                                                      # wait for any leftover processes

15 is arbitrary. There may be so much I/O on your filesystem(s) that you need to lower that number. If there is little impact (see output ofiostat -zxnm 1 10) you may want to bump it up. Also since you did not post the directory hierarchy, and I am guessing, the result of find may cause du to read the same directories multiple times, which impedes performance ex:

Code:
/dira
     foo
          dir1
             subdir1
             subdir2
          dir2
     foo1

So if you know the correct full names of all of the directories you want to monitor
put them in a file (call it dir.txt) like this:
Code:
/dira/foo/big1
/dira/foo/big2
/dira/foo2/big1
/dirb/foo/big2

so that du does each "endpoint" directory just one time. This may or may not be feasible.

Change the above code this:

Code:
cnt=0
> /tmp/summary_sizes.txt   # set the file to zero length
while read dirname 
do
     [ "$dirname" = "/dira" ]  && continue                # skip highlevel dirs
     [ "$dirname" = "/dirb" ]  && continue
     du -s $dirname >> /tmp/summary_sizes.txt &   # run du in the background
     cnt=$(( $cnt + 1 ))                                          # count background processes
     [  $(( $cnt % 15 )) -eq 0 ]  && wait                   # when 15 active -- wait
done  < /path/to/dir.txt
wait                                                                      # wait for any leftover processes

 

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