10-25-2014
Hi Guys,
I'd just like to chuck in my two cents worth on this, I've fallen victim to the perfomance issues that "cache thrashing" can cause and it took me some time to work out what the issue actually was.
Although the issue was in my case "Solaris" based and was due to my configuration of the system - down to me I'm afraid. The system in question a Sun "T" series had been domained and I had set up some containers/zones, due to my lack of understanding I set up a small domain across core boundaries - with the result that the four "VCPU's" actually threads spent a high percentage of time sending cache from core to core.
A lesson well learned at the time, although I think in the later versions of the OS related software and the firmware the impact of such a mistake is reduced - I tend to shy away from configuring domains or VM's - particularly small ones over core boundaries.
Regards
Dave
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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, where pid is the process ID of the process, 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 vari-
ous 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 privileged user must do one of the following
* Edit /etc/launchd.conf or $HOME/.launchd.conf and add a line specifying the limit limit core unlimited
* A privileged user can also enable cores with launchctl limit core unlimited
* A privileged user can also enable core files by using ulimit(1) or limit(1) depending upon the shell.
SEE ALSO
gdb(1), setrlimit(2), sigaction(2), Mach-O(5), launchd.conf(5), launchd.plist(5), sysctl(8)
HISTORY
A core file format appeared in Version 6 AT&T UNIX.
BSD
June 26, 2008 BSD