Xeon Machine

[Matthew F. <mat...@gm...>]

Hey all,

I'm using oprofile version 0.9.3 to perform some profiling on a Xeon
machine which has two quad cores. The metric i'm attemping to recover
is the L2 cache ratio and therefore i'm need to collect both the L2
requests and L2 misses. However, when i attempt to record them both at
once the profile only reports one. My current solution is to record
them on separate runs but this provides inaccurate results.

Also, occasionally when i run opreport the output file is 0 bytes and
there is nothing recorded even thou i perform a dump before running
opreport.

A side note is that i've run the same script on an Intel Core2 Duo
system and it provides both outputs fine.

The script / sequence i'm using to setup oprofile is below. Any help
would be greatly appreciated.


Thanks

Matt



#!/bin/bash
#
# This script can be used to setup profiling on the xeon System

EVENT0=LLC_MISSES:1000000:65:1:1
EVENT1=LLC_REFS:1000000:79:1:1
VMLINUX=/home/cheka/linux-2.6.18.4/vmlinux
KERNBUFFSIZE=65536

opcontrol --reset

opcontrol --setup --event=$EVENT0 --event=$EVENT1 --vmlinux=$VMLINUX
--buffer-size=65536 --buffer-watershed=0 --cpu-buffer-size=0
--callgraph=0 --separate=library,kernel,cpu,thread

opcontrol --start-daemon


Then i start the tests as normal

opcontrol --start

stop the tests

opcontrol --stop
dump the output

opcontrol --dump

And finally use opreport to prouce the output using both
opreport --merge tgid --symbols >outputfile.txt
opreport --merge cpu --symbols >outputfile1.txt