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Full Discussion: How to make awk command faster for large amount of data?
Top Forums Shell Programming and Scripting How to make awk command faster for large amount of data? Post 303024256 by Corona688 on Thursday 4th of October 2018 03:15:16 PM
Old 10-04-2018
Worst-case, you're adding tons more overhead to files which need processing anyway. There's a lot more to be gained by quitting early than doing extra.

12 hours is surprisingly slow, though. awk is definitely slower than gzip, but it can process 50 megs per second on one of my more ancient systems. Assuming an 8:1 compression ratio for text, you're getting closer to 20. Given that, I'm suspicious that you really are hitting disk bandwidth limits.

Are you using an SSD or a spinning disk? A spinning disk will be hit particularly hard if it has to read and write simultaneously. Its bandwidth will be more than halved. And this is a worst-case situation, where your data is so large that cache is simply no help at all. And is your disk physically attached or a NAS, NFS share, USB disk, or some other such thing? The protocol overhead of these can be horrendous in practice.

If you're not hitting disk bandwidth limits though, multiprocessing should be a big gain.
Last edited by Corona688; 10-04-2018 at 04:37 PM..
 

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LEARN ABOUT NETBSD

apmlabel

APMLABEL(8)						    BSD System Manager's Manual 					       APMLABEL(8)

NAME

     apmlabel -- update disk label from Apple Partition Map

SYNOPSIS

     apmlabel [-fqrw] device

DESCRIPTION

     apmlabel is used to update a NetBSD disk label from the Apple Partition Map found on disks that were previously used on Mac OS systems (or
     other APM using systems).

     apmlabel scans the APM contained in the first blocks of the disk and generates additional partition entries for the disk from the entries
     found.  Driver and patches partitions are ignored.

     Each APM entry which does not have an equivalent partition in the disk label (equivalent in having the same size and offset) is added to the
     first free partition slot in the disk label.  A free partition slot is defined as one with an fstype of 'unused' and a size of zero ('0').
     If there are not enough free slots in the disk label, a warning will be issued.

     The raw partition (typically partition c, but d on i386 and some other platforms) is left alone during this process.

     By default, the proposed changed disk label will be displayed and no disk label update will occur.

     Available options:

     -f  Force an update, even if there has been no change.

     -q  Performs operations in a quiet fashion.

     -r  In conjunction with -w, also update the on-disk label.

     -w  Update the in-core label if it has been changed.

SEE ALSO

     disklabel(8), dkctl(8), pdisk(8)

HISTORY

     The apmlabel command appeared in NetBSD 5.0.

BSD
								   May 19, 2007 							       BSD
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