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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GCORE(1) General Commands Manual GCORE(1)
NAME
gcore - get core image of running process
SYNOPSIS
gcore [-s][-c core] pid
DESCRIPTION
gcore creates a core image of each specified process, suitable for use with adb(1). By default the core image is written to the file
<pid>.core.
The options are:
-c Write the core file to the specified file instead of <pid>.core.
-s Stop the process while creating the core image and resume it when done. This makes sure that the core dump will be in a consistent
state. The process is resumed even if it was already stopped. Of course, you can obtain the same result by manually stopping the
process with kill(1).
The core image name was changed from core.<pid> to <pid>.core to prevent matching names like core.h and core.c when using programs such as
find(1).
FILES
<process-id>.core The core image.
BUGS
If gcore encounters an error while creating the core image and the -s option was used the process will remain stopped.
Swapped out processes and system processes (the swapper) may not be gcore'd.
4.2 Berkeley Distribution April 15, 1994 GCORE(1)