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Full Discussion: How to replace all but the first 3 characters with sed?
Top Forums Shell Programming and Scripting How to replace all but the first 3 characters with sed? Post 302935083 by Scrutinizer on Thursday 12th of February 2015 03:11:50 PM
Old 02-12-2015
You should ignore the time it takes the first time, because that is used to read pieces of program and data into memory, which varies a lot, in addition to the time it takes to run the program. The second time, it is already in memory, so the time is largely the time to run the program. That's why it is a lot faster and also more consistent, which makes it a more reliable way to do comparisons relative to other solutions..
 

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LEARN ABOUT CENTOS

s390_runtime_instr

S390_RUNTIME_INSTR(2)						System Calls Manual					     S390_RUNTIME_INSTR(2)

NAME

       s390_runtime_instr - enable/disable s390 CPU run-time instrumentation

SYNOPSIS

       #include <asm/runtime_instr.h>

       int s390_runtime_instr(int command, int signum);

DESCRIPTION

       The s390_runtime_instr() system call starts or stops CPU run-time instrumentation for the calling thread.

       The   command  argument	controls  whether  run-time  instrumentation  is  started  (S390_RUNTIME_INSTR_START,  1)  or  stopped	(S390_RUN-
       TIME_INSTR_STOP, 2) for the calling thread.

       The signum argument specifies the number of a real-time signal.	The real-time signal is sent to the thread if the run-time instrumentation
       buffer is full or if the run-time-instrumentation-halted interrupt occurred.

RETURN VALUE

       On  success,  s390_runtime_instr() returns 0 and enables the thread for run-time instrumentation by assigning the thread a default run-time
       instrumentation control block.  The caller can then read and modify the control block and start the run-time instrumentation.  On error, -1
       is returned and errno is set to one of the error codes listed below.

ERRORS

       EINVAL The value specified in command is not a valid command or the value specified in signum is not a real-time signal number.

       ENOMEM Allocating memory for the run-time instrumentation control block failed.

       EOPNOTSUPP
	      The run-time instrumentation facility is not available.

VERSIONS

       This system call is available since Linux 3.7.

CONFORMING TO

       This  Linux-specific  system call is available only on the s390 architecture.  The run-time instrumentation facility is available beginning
       with System z EC12.

NOTES

       Glibc does not provide a wrapper for this system call, use syscall(2) to call it.

SEE ALSO

       syscall(2), signal(7)

COLOPHON

       This page is part of release 3.53 of the Linux man-pages project.  A description of the project, and information about reporting bugs,  can
       be found at http://www.kernel.org/doc/man-pages/.

Linux Programmer's Manual					    2012-12-17						     S390_RUNTIME_INSTR(2)
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