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Full Discussion: lightweight function for measuring time ( better than clock_getime )
Operating Systems Linux Red Hat lightweight function for measuring time ( better than clock_getime ) Post 302539401 by manustone on Sunday 17th of July 2011 07:07:16 AM
Old 07-17-2011
lightweight function for measuring time ( better than clock_getime )
HI
I have a Red Hat Enterprise with Real Time kernel.

Are you aware if there are C functions for this kernel or some code/library for this OS for measuring time more lightweight than clock_gettime and gettimeofday? THe hardware I have is NUMA.

Reading forums I found gethrtime but it is available on Solaris only; this last spends few cycles compared to clock_gettime and gettimeofday eating the CPU.

Do you know if for Red Hat someomene did something similar?
My distro is the following

THanks a lot

Code:
     uname -a
     Linux lndbxdev01 2.6.24.7-108.el5rt #1 SMP PREEMPT RT 
     Mon Mar 23 10:58:10 EDT 2009 x86_64 x86_64 x86_64 GNU/Linux

     cat/etc/redhat-release
     Red Hat Enterprise Linux Server release 5.3 (Tikanga)

 

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rhn-profile-sync

RHN-PROFILE-SYNC(8)						   Red Hat, Inc.					       RHN-PROFILE-SYNC(8)

NAME

       rhn-profile-sync - Update system information on Red Hat Network.

SYNOPSIS

       rhn-profile-sync [options]

DESCRIPTION

       rhn-profile-sync  is  a	client program that connects to Red Hat Network (or a Red Hat Network Satellite) and refreshes the data stored for
       this system.

       rhn-profile-sync updates data about installed packages, machine hardware, and virtual guest instances (if virtualization is enabled).

OPTIONS

       -v, --verbose
	      Increase the debugging output.

       --proxy=PROXY
	      Specify an http proxy to use.

       --proxyUser=PROXYUSER
	      Specify a username to use for an authenticated proxy. This option must be used in conjunction with proxyPassword.

       --proxyPassword=PROXYPASSWORD
	      Specify a password to use for an authenticated proxy. This option must be used in conjunction with proxyUser.

       --version
	      Show the program's version number and exit.

       -h, --help
	      Show a help message and exit.

FILES

       /etc/sysconfig/rhn/up2date
	      The common configuration file used by RHN client programs.

SEE ALSO

       rhn_check(8), rhn_register(8), rhnreg_ks(8), rhnsd(8), up2date(5).

AUTHORS

       See the AUTHORS file included with this software.

       This manual page was written by James Bowes <jbowes@redhat.com>

BUGS

       Report bugs to <http://bugzilla.redhat.com>.

COPYRIGHT

       Copyright (C) 1999-2010 Red Hat, Inc.

       This is free software; see the source for copying conditions.  There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICU-
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Linux								  2010 August 30					       RHN-PROFILE-SYNC(8)
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