#pragma section-numbers on
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<<TableOfContents>>

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= Overview =
The Intel VTune performance analyzer utility helps in determining bottlenecks and sources of suboptimal utilization of CPU resources by a given application. It provides also a conveneient way to create a call graph of the application as well as to gather numerous Hardware Performance events which provide both programer and system integrator with invaluable detailed insight into the actual code execution.

= Using VTune =

== GUI mode (Eclipse) ==
To start the GUI for VTune just type in a terminal:
{{{#!c 
# /opt/intel/vtune/bin/vtlec &
}}}

NB: DO NOT RUN SAMPLING WITH A LOT (MORE THAN 50-60) EVENTS AT A TIME, YOU CAN EASILY EXCEED THE MEMORY SIZE AVAILABLE ON THE MACHINE AND SYSTEM CRASHES ARE POSSIBLE!

== Command line mode ==
Before being able to use VTune from the command line or in a script, one should extend the $PATH environment variable:
{{{
# export PATH=$PATH:/opt/intel/vtune/bin
# which vtl
}}}

A simple activity for sampling, and then showing the data can be done in this way:
{{{
# vtl activity -d 2 -c sampling -app ls run
# vtl show -all
# vtl view a1::r1
}}}

The output of the last two commands should look something like the following:
{{{
a1__Activity1
    r1___Sat Jun 26 10:11:57 2010 - Sampling Results [127.0.0.1]
    r2_______Run 1
    r3_________CPU_CLK_UNHALTED.THREAD
    r4_________INST_RETIRED.ANY
a2__Activity2
    r1___Sat Jun 26 10:13:34 2010 - Sampling Results [127.0.0.1]
    r2_______Run 1
    r3_________CPU_CLK_UNHALTED.THREAD
    r4_________INST_RETIRED.ANY
a3__Activity3
    r1___Sat Jun 26 10:15:55 2010 - Sampling Results [127.0.0.1]
    r2_______Run 1
    r3_________CPU_CLK_UNHALTED.THREAD
    r4_________INST_RETIRED.ANY

Module                     Process                      CPU_CLK_UNHALTED.THREAD samples INST_RETIRED.ANY samples Clocks per Instructions Retired - CPI Process Path                     Process ID Original Module Path
vmlinux-2.6.18-194.3.1.el5 pid_0x0                      893                             18                       49.611                                                                 0x0        /boot/
vmlinux-2.6.18-194.3.1.el5 pid_0x349                    16                              3                        5.333                                                                  0x349      /boot/
libpthread-2.5.so          vtl.bin                      8                               0                        0.000                                 /opt/intel/vtune/shared/bin/     0x2f47     /lib/
vmlinux-2.6.18-194.3.1.el5 vtl.bin                      7                               1                        7.000                                 /opt/intel/vtune/shared/bin/     0x2f47     /boot/
vmlinux-2.6.18-194.3.1.el5 ntd                          5                               0                        0.000                                 /opt/sag/exx/v721/bin/           0x1241     /boot/
ntd                        ntd                          3                               1                        3.000                                 /opt/sag/exx/v721/bin/           0x1241     /opt/sag/exx/v721/bin/
libmutant.so               vtl.bin                      2                               1                        2.000                                 /opt/intel/vtune/shared/bin/     0x2f47     /opt/sag/exx/v721/lib/
vmlinux-2.6.18-194.3.1.el5 irqbalance                   1                               1                        1.000                                 /usr/sbin/                       0x117f     /boot/
cpufreq_ondemand           pid_0x349                    1                               0                        0.000                                                                  0x349
libc-2.5.so                vtserver.bin                 1                               0                        0.000                                 /opt/intel/vtune/rdc/shared/bin/ 0x2fc0     /lib64/
Other32                    dsm_sa_datamgr32d.5.9.1.6284 1                               0                        0.000                                 /opt/dell/srvadmin/dataeng/bin/  0x196a

}}}

= Exporting and analyzing data =

= Results =
The following sections present the results of various High Energy Physics applications. Central for this results is the floating point percentage of every application compared to the HEP-SPEC benchmark. Results near the result of HEPSPEC are proof for the applicability of HEPSPEC all_cpp benchmarks for simulating HEP application-like workload and thus providing consistent base for testing computational resource power.
== HEP-SPEC 2006 ==