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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 303024188 by Corona688 on Tuesday 2nd of October 2018 01:46:37 PM
Old 10-02-2018
Assuming your input is sorted by date (which seems likely, given logfiles), processing files individually makes another really big optimization possible - once the date exceeds the cutoff, quit! You might skip entire files.

Code:
...
gunzip < "$FILE" | awk '$3 > "[20/Jun/2018:22:00:00" { exit } ; {...}' > /tmp/$$/$FNAME &
...

That may be worth trying even without multithreading, actually.

Code:
for FILE in nginx*
do
        gunzip < "$FILE" | awk '$3 > "[20/Jun/2018:22:00:00" { exit } ; {...}'
done > output

This User Gave Thanks to Corona688 For This Post:
brenoasrm
 

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LEARN ABOUT DEBIAN

tv_cat

TV_CAT(1p)						User Contributed Perl Documentation						TV_CAT(1p)

NAME

       tv_cat - Concatenate XMLTV listings files.

SYNOPSIS

       tv_cat [--help] [--output FILE] [FILE...]

DESCRIPTION

       Read one or more XMLTV files and write a file to standard ouput whose programmes are the concatenation of the programmes in the input
       files, and whose channels are the union of the channels in the input files.

       --output FILE write to FILE rather than standard output

       The treatment of programmes and channels is slightly different because for programmes, the ordering is important (typically programmes are
       processed or displayed in the same order as they appear in the input) whereas channels are just a set indexed by channel id.  There is a
       warning if channel details clash for the same id.

       One more wrinkle is the credits (source, generator and so on), they are taken from one of the files and then there's a warning if the other
       files differ.  If two input files have different character encodings, then it is not meaningful to combine their data (without recoding or
       other processing) and tv_cat die with an error message.

       This tool is rather useless, but it makes a good testbed for the XMLTV module.

SEE ALSO

       xmltv(5).

AUTHOR

       Ed Avis, ed@membled.com

perl v5.14.2							    2003-10-25								TV_CAT(1p)
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