08-22-2013
IBM Hardware: Test speed of an execution core reliably.
Hey Folks,
Doing simple floating point or integer arithmetic is limited since if another execution core is not busy, the system will (presumably?) assign CPU resources to where they are needed so I could be getting the performance of 2 or more cores theoretically?
Any good reliable way to benchmark this on IBM Hardware?
For example, some older Power systems come rated with higher MHz rates but I want to see that advantage, if applicable, in a simple test. Anyway to do this through the CLI without having to install anything new or big?
Cheers,
DH
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LEARN ABOUT OPENDARWIN
core
CORE(5) BSD File Formats Manual CORE(5)
NAME
core -- memory image file format
SYNOPSIS
#include <sys/param.h>
DESCRIPTION
A small number of signals which cause abnormal termination of a process also cause a record of the process's in-core state to be written to
disk for later examination by one of the available debuggers. (See sigaction(2).) This memory image is written to a file named by default
core.pid in the /cores directory; provided the terminated process had write permission in the directory, and the directory existed.
The maximum size of a core file is limited by setrlimit(2). Files which would be larger than the limit are not created.
The core file consists of the ~ Mach-O(5) header as described in the <mach-o/loader.h> file. The remainder of the core file consists of
various sections described in the Mach-O(5) header.
NOTE
Core dumps are disabled by default under Darwin/Mac OS X. To re-enable core dumps, a privlaged user must edit /etc/hostconfig to contain the
line:
COREDUMPS=-YES-
SEE ALSO
gdb(1), setrlimit(2), sigaction(2), Mach-O(5), sysctl(8)
HISTORY
A core file format appeared in Version 6 AT&T UNIX.
BSD
March 18, 2002 BSD