How to we generate load on CPU

[chindi]

We have a test server , weneed to test Nagios tool .

We would like to generate load on HPUX 11iv3 OS , rx2800i4 , let me know how do we achieve the same ?

[chindi]

Got this Infor from James old post ;

For creating a CPU load that stops after 60-seconds:

# perl -e '$SIG{ALRM}=sub {exit};alarm 60;1 while {}'

...change the value of 'alarm 60' according to your tastes.

For allocating some memory and sleeping for some period thereafter:

# perl -e '$sz=$ARGV[0] ||1_000_000;@a=1..$sz;sleep 30'

...You may need to adjuct the default allocation of 1,000,000 characters depending upon your kernel parameters. You can pass any value you want, too:

# perl -e '$sz=$ARGV[0] ||1_000_000;@a=1..$sz;sleep 30' 50000

...means allocate a string of 50,000 characters instead of the default 1,000,000.

As for I/O, use the classic one:

# dd if=/dev/rdsk/c2t0d0 of=/dev/null bs=256k count=1000

...vary the count parameter to vary the amount of time doing I/O.

Thanks James :-)

[Bill Hassell · Accepted solution]

Attached is a script that generates 1 or more 100% CPU load processes. There's no limits imposed so you can start 2 processes or 100 processes, each one consuming 100% CPU usage and shared CPU usage when the load exceeds the number of CPUs. Works on HP-UX, Linux, AIX and Solaris. Uses ksh so AIX might need ksh loaded or switch the interpreter line to bash. Use sar, top or Glance to see what is happening.

[chindi]

Thanks a ton Bill