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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 303024161 by Don Cragun on Tuesday 2nd of October 2018 05:01:04 AM
Old 10-02-2018
I must be missing something here. But, since the starting and ending timestamps in the awk code in the sample pipeline are on the same date and the times are in 24 hour format (not 12 hour with AM/PM), I see no reason why there is any need to convert the two string arguments to Seconds since the Epoch values and perform numeric comparisons on those converted Seconds since the Epoch values instead of comparing the input values as strings. Furthermore, performing the string comparisons should be faster than converting to strings to integers and then performing a numeric comparison. However, if the start and end timestamps are on different dates, the comments made by vgersh99 and jim mcnamara are absolutely correct.

I have never heard of the unpigz command used at the head of the pipeline being used and I have no idea how the files matched by the pattern nginx* are named nor how big they are. If there are lots of huge compressed files and unpigz is being used to produce uncompressed text from all of those files to be used as input to awk (or if unpigz is a typo and the intended utility at the start of the pipeline was gunzip -c or, equivalently, zcat) and if part of the name matched by the asterisk in nginx* encodes the dates contained in that file, the way to speed up your pipeline might well be to select a smaller set of files to uncompress instead of trying to speed up the awk code when the slow part of your pipeline may well be the time needed to uncompress unneeded data and to then filter that unneeded data in your awk code.
 

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LEARN ABOUT DEBIAN

glbindprogrampipeline

GLBINDPROGRAMPIPELIN(3G)					  [FIXME: manual]					  GLBINDPROGRAMPIPELIN(3G)

NAME

       glBindProgramPipeline - bind a program pipeline to the current context

C SPECIFICATION

       void glBindProgramPipeline(GLuint pipeline);

PARAMETERS

       pipeline
	   Specifies the name of the pipeline object to bind to the context.

DESCRIPTION

       glBindProgramPipeline binds a program pipeline object to the current context.  pipeline must be a name previously returned from a call to
       glGenProgramPipelines(). If no program pipeline exists with name pipeline then a new pipeline object is created with that name and
       initialized to the default state vector.

       When a program pipeline object is bound using glBindProgramPipeline, any previous binding is broken and is replaced with a binding to the
       specified pipeline object. If pipeline is zero, the previous binding is broken and is not replaced, leaving no pipeline object bound. If no
       current program object has been established by glUseProgram(), the program objects used for each stage and for uniform updates are taken
       from the bound program pipeline object, if any. If there is a current program object established by glUseProgram(), the bound program
       pipeline object has no effect on rendering or uniform updates. When a bound program pipeline object is used for rendering, individual
       shader executables are taken from its program objects.

ERRORS

       GL_INVALID_OPERATION is generated if pipeline is not zero or a name previously returned from a call to glGenProgramPipelines() or if such a
       name has been deleted by a call to glDeleteProgramPipelines().

SEE ALSO

       glCreateShader(), glCreateProgram(), glCompileShader(), glLinkProgram(), glGenProgramPipelines(), glDeleteProgramPipelines(),
       glIsProgramPipeline()

COPYRIGHT

       Copyright (C) 2010 Khronos Group. This material may be distributed subject to the terms and conditions set forth in the Open Publication
       License, v 1.0, 8 June 1999.  http://opencontent.org/openpub/.

[FIXME: source] 						    05/30/2012						  GLBINDPROGRAMPIPELIN(3G)
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