Bash script search, improve performance with large files Post: 303033258

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Top Forums Shell Programming and Scripting Bash script search, improve performance with large files Post 303033258 by SDohmen on Tuesday 2nd of April 2019 08:11:57 AM

04-02-2019

Registered User

Quote:

Originally Posted by RudiC

You might want to build an "alternation regex", with not too many keywords, and modify the matching slightly. Compare performance of

Code:

awk '
NR==FNR                 {SRCH=SRCH DL $0
                         DL = "|"
                         next
                        }
tolower($0) ~ SRCH      {print > "'"$PAD/removed_woord.csv"'"
                         next
                        }

                        {print > "'"$PAD/filtered_winnaar_2.csv"'"
                        }
' file3 file4 

real    0m2,328s
user    0m2,318s
sys    0m0,005s

to this

Code:

time awk '
NR==FNR         {id[$0]
                 next
                }
                {for (SP in id) if (tolower($0) ~ SP)    {print > "'"$PAD/removed_woord.csv"'"
                                                 next
                                                }
                }
                {print > "'"$PAD/filtered_winnaar_2.csv"'"
                }
' file3 file4
real    0m17,038s
user    0m16,995s
sys    0m0,025s

seems to make a factor of roughly 7. The output seems to be identical. Please try and report back.

I just did this one again and i got it working. I noticed the -F";" was missing so i added that and it worked flawlessly. The complete script runs in about 20 sec now which was more then 7 min first.

SDohmen

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ocr4gamera

OCR4GAMERA(1)															     OCR4GAMERA(1)

NAME

       ocr4gamera - OCR system using the Gamera framework

USAGE

       ocr4gamera -x <traindata> [options] <imagefile>

OPTIONS

       -v <int>, --verbosity=<int>
	      Set verbosity level to <int>.  Possible values are 0 (default): silent operation; 1:  information on progress; >2: segmentation info
	      is written to PNG files with prefix debug_.

       -h, --help
	      Display help and exit.

       -d, --deskew
	      Do a skew correction (recommended).

       -f, --filter
	      Filter out very large (images) and very small components (noise).

       -a, --automatic-group
	      Autogroup glyphs with classifier.

       -x <file>, --xmlfile=<file>
	      Read training data from <file>.

       -o <xml>, --output=<xml>
	      Write recognized text to file <xml> (otherwise it is written to stdout).

       -c <csv>, --extra_chars_csvfile=<csv>
	      Read additional class name conversions from file <csv>.  <csv> must contain one conversion per line.

       -R <rules>, --heuristic_rules=<rules>
	      Apply heuristic rules <rules> for disambiguation of some chars.  <rules> can be roman (default) or none (for no rules).

       -D, --dictionary-correction
	      Correct words using a dictionary (requires aspell or ispell).

       -L <lang>, --dictionary-language=<lang>
	      Use <lang> as language for aspell (when option -D is set).

       -e <int>, --edit-distance=<int>
	      Correct words only when edit distance not more than <int>.

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