Quad or Duel Processors Post: 85310

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Special Forums Windows & DOS: Issues & Discussions Quad or Duel Processors Post 85310 by rhfrommn on Tuesday 4th of October 2005 01:59:24 PM

10-04-2005

Registered User

There is no way of knowing for sure because it depends on the software you are trying to run.

If your software is able to use the multiple processors for parallel processing the quad option may well be better. But many apps don't do that, in which case the faster dual processors will have better performance.

Another factor is your workload characteristics. Can you run your software multiple times? For example, I once administered a 24 processor webserver where we ran up to 80 instances of a webserver all at once. The fact that we had lots of processors didn't make any of the individual webservers run faster, but it did allow us to have more running at once without slowing down the box. In a case like that more processors is helpful. But if you are running just a single instance of your app the extra processors are useless (unless the app does parallel threading like I mentinoed above).

Your best option is to install your software on both types and benchmark it before buying if possible.

rhfrommn

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LEARN ABOUT OSF1

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psradm(8)						      System Manager's Manual							 psradm(8)

NAME

       psradm, offline, online - Stops and starts processors in a multiprocessor system

SYNOPSIS

       /usr/sbin/psradm -f  [-v] [[-a] [processor_id...]]

       /usr/sbin/psradm -n  [-v] [[-a] [processor_id...]]

       /usr/sbin/online [-v] [processor_id...]

       /usr/sbin/offline [-v] [processor_id...]

OPTIONS

       The following options apply only to the psradm command: Specifies that all the processors except the master processor be put off line or on
       line.  Puts the specified processor off line.  Puts the specified processor on line.

       The following option applies to all forms of the command: Displays a message about the status of the operation performed on each processor.

DESCRIPTION

       On a multiprocessor system, the psradm command puts one or more processors off line (stops a processor) or on line (starts a processor).

       The processor_id variable specifies an integer that uniquely identifies a processor.  Use the psrinfo command to display processor  identi-
       fication numbers.

       The  offline  command puts one or more processors off line (stops a processor).	If no processors are specified, all processors that are on
       line are stopped except the master processor.

       The online command puts one or more processors on line (starts a processor).  If no processors are specified, all processors that  are  off
       line are started.

       Note that you cannot use these commands to start or stop the master processor in a multiprocessor system.

       You must be the root user to use this command.

       The /var/adm/wtmp file contains information about successful processor state transitions.

RESTRICTION

       Do not use the psradm command to disable CPUs when benchmarking performance, because the command does not provide an accurate reflection of
       the performance of a system that actually has fewer CPUs.  Accurate performance results are obtained only when you disable the CPUs at  the
       SRM console command level.

EXAMPLES

       The  following command puts processors 2 and 3 off line: # psradm -f 2 3 The following command puts all the processors on line: # psradm -n
       -a The following command puts all processors on line: # online -v

FILES

SEE ALSO

       Commands: pset_info(1), psrinfo(1)

       Files: processor_sets(4)

																	 psradm(8)