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Full Discussion: How to read a fast written log file at Real time speed?
Top Forums UNIX for Advanced & Expert Users How to read a fast written log file at Real time speed? Post 302936623 by cool.aquarian on Thursday 26th of February 2015 06:10:08 PM
Old 02-26-2015
CPU & Memory How to read a fast written log file at Real time speed?
Hello All,

I am building a real time parser for a log file in my application.
The log file is continuously written at a very fast pace and gets rolled over every 10 minutes.

I have measured the speed and observed that around 1000 lines are written to it every second, each line about 30-40 characters.

I have tried using tail -F, but it always lags behind the speed at which the file is being written.
Could you suggest anything else I can use to read the file line by line quickly at Realtime speed ?

Below is what I have right now:
Code:
tail -F --lines=10000000 --retry --max-unchanged-stats=10 "$logFile" | while IFS= read -r line || [ -n "$line" ]
do
 -- some logic --
done

Thank you.
-CaQ
 

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LEARN ABOUT HPUX

uugetty

uugetty(1M)															       uugetty(1M)

NAME

       uugetty - set terminal type, modes, speed and line discipline

SYNOPSIS

       timeout] line [speed [type [linedisc]]]

       file

DESCRIPTION

       The commands, including are targeted for removal from HP-UX; see the below.

       sets  terminal  type,  modes,  speed  and  line	discipline.   It is similar to except that supports using the line in both directions (see
       getty(1M)).  This allows users to log in, but, if the line is free, and can dial out (see uucico(1), cu(1), and ct(1)).	When  devices  are
       used with and lock files are created.  Therefore, when the call to returns (see open(2)) (or the first character is read when the option is
       used), the status of the lock files indicates whether the line is used by or someone trying to log in.  See getty(1M) for more information.

       Note that with the option, several carriage-return characters might be required before the login message is output.  When is trying to  log
       in, it can be instructed to enter numerous carriage-return characters with the following login script:

       where ... represents whatever would normally be used for the login sequence.

       An  entry for an intelligent modem or direct line that has a on each end must use the option (this causes uugetty to wait to read a charac-
       ter before it enters the login message, thus preventing two instances of from looping).	If there is a on one end of a direct  line,  there
       must be a on the other end as well.

EXAMPLES

       The following line is an entry using on an intelligent modem or direct line:

WARNINGS

       Use of commands, including is discouraged because they are targeted for removal from HP-UX.  Use ftp(1) or rcp(1) instead.

       does not work when is used with an intelligent modem such as a Penril or a Ventel.

FILES

SEE ALSO

       ct(1), cu(1), login(1), uucico(1M), getty(1M), init(1M), ioctl(2), gettydefs(4), inittab(4), tty(7).

       Tim O'Reilly and Grace Todino,
	      O'Reilly & Associates, Inc. USA.

       Grace Todino and Dale Dougherty,
	      O'Reilly & Associates, Inc. USA.

								  TO BE OBSOLETED						       uugetty(1M)
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