Traffic Utilization on router high CPU usage.

Long time ago, I was trying to address traffic utilization issues on border routers. This is the summary of my communication with nsp mailing list [Traffic Utilization Summary].

Simple syncronization via ssh with rsync.

One can syncronize two different locations by using rsync via ssh or without ssh.
Here are the steps:

1. get from the other location
rsync -avuzb dir/mydir/ .

2. put into other location
rsync -Cavuzb . dir/mydir/

If one of the location is reachable via ssh then one ca write

rsync -avz -e ssh remoteuser@remotehost:/remote/dir /this/dir/

Look at the man pages for more details. Actually -e flag is not needed.

CPU Timing in a C code

Examine this simple example :

#include < stdio.h >
#include < stdlib.h >
#include < time.h >
#include < math.h >

int main();

int main() {
  long int i,a;
  clock_t cputime,cputime1;
  double timing,timing0;
   cputime= clock();
    for(i=0;i<10000000;i++){
       a=pow(4,2);
       a=pow(4,2);
       a=pow(4,2);
       a=pow(4,2);
       a=pow(4,2);
      }

   cputime1= clock();
   timing0=((double) cputime1-cputime);
   timing=((double) cputime1-cputime) / CLOCKS_PER_SEC;
   printf("timing =%12.9f clock per sec=%d timing0=%12.9f\n",
          timing,CLOCKS_PER_SEC,timing0);
   exit(0);
}

Latex Poster: A working full example

You must use Latex to generate your posters, because it looks beautiful. Here is fully working and self contained example [latex_poster].