01-05-2013
If you are looking at a single CEC model of the P570 there is not a lot of difference between the P520, P550 or P570 from a "sand-box" for "playing around"
A P520 will have 1, 2 or 4 processors depending on Model,
A P550 will have a maximum of 8 or 16 depending on Model,
and a P570 will have, I suspect, a maximum of 4 processors per CEC - at least with Power5. (A P570 could have up to 4 CECS interconnected in a frame for 16 processors and much more RAM).
Personally, with a small budget - look at P520.. If you are looking for experience with more than 4 processors - P550 is probably most economical path.
Hope this helps.
p.s. Rack units don't have to be in a rack, but stacking can become more difficult when you have more than one - regardless of manufacturer.
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LEARN ABOUT CENTOS
get_nprocs
GET_NPROCS(3) Linux Programmer's Manual GET_NPROCS(3)
NAME
get_nprocs, get_nprocs_conf - get number of processors
SYNOPSIS
#include <sys/sysinfo.h>
int get_nprocs(void);
int get_nprocs_conf(void);
DESCRIPTION
The function get_nprocs_conf() returns the number of processors configured by the operating system.
The function get_nprocs() returns the number of processors currently available in the system. This may be less than the number returned by
get_nprocs_conf() because processors may be offline (e.g., on hotpluggable systems).
RETURN VALUE
As given in DESCRIPTION.
CONFORMING TO
These functions are GNU extensions.
NOTES
The current implementation of these functions is rather expensive, since they open and parse files in the /sys file system each time they
are called.
The following sysconf(3) calls make use of the functions documented on this page to return the same information.
np = sysconf(_SC_NPROCESSORS_CONF); /* processors configured */
np = sysconf(_SC_NPROCESSORS_ONLN); /* processors available */
EXAMPLE
The following example shows how get_nprocs() and get_nprocs_conf() can be used.
#include <stdio.h>
#include <sys/sysinfo.h>
int
main(int argc, char *argv[])
{
printf("This system has %d processors configured and "
"%d processors available.
",
get_nprocs_conf(), get_nprocs());
return 0;
}
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/.
GNU
2012-03-20 GET_NPROCS(3)