Prerequisites

To enable system-wide and uncore event collection that allows the measurement of DRAM and MCDRAM memory bandwidth that is a part of the Memory Access and HPC Performance Characterization analysis types, use root or sudo to set
/proc/sys/kernel/perf_event_paranoid
to
0
.
echo 0>/proc/sys/kernel/perf_event_paranoid
To enable collection with the Microarchitecture Exploration analysis type, increase the default limit of opened file descriptors. Use root or sudo to increase the default value in
/etc/security/limits.conf
to
100*
<number_of_logical_CPU_cores>
.
<user>
hard nofile
<100 * number_of_logic_CPU_cores>
<user>
soft nofile
<100 * number_of_logic_CPU_cores>

1. Configure and run analysis on the target system with an Intel Xeon Phi processor

Finalization on host system (recommended): Use a command to run the analysis on the system with the Intel Xeon Phi processor without finalizing. This option results in the best performance.
From a command prompt, run the collection with the deferred finalization option to calculate the binary check sum for proper symbol resolution on the host system. For example, to run a Memory Access analysis:
vtune
-collect memory-access -finalization-mode=deferred -r
<my_result_dir>
./my_app
For more information, see
vtune
Command Syntax and finalization-mode topics.
You can also generate a command using the
VTune
Profiler
GUI as described below. After generating the command, add the
-finalization-mode=deferred
option to the command to delay finalization.
Finalization on target system: Use the
VTune
Profiler
GUI on the host system to generate a command for the target system with the Intel Xeon Phi processor. Run and finalize the analysis on the target system. This method may not provide the fastest results.
In the
WHERE
pane, select
Arbitrary Host
button, set the processor architecture to
Intel® Processor code named Knights Landing
, and specify the operating system type.
In the
WHAT
pane, select
Launch Application
and configure the analysis:
Enter the application name and parameters.
Select the
Use MPI Launcher
checkbox and provide the launcher name, number of ranks, ranks to profile, and result location.
In the
HOW
pane, select and configure an analysis type.
Hotspots
HPC Performance Characterization
Microarchitecture Exploration
Memory Access
Click the
Command Line
button at the bottom of the window to generate the command.
Copy the generated command to a command prompt on the target system and run the analysis. Finalization begins after the analysis completes. Finalization may take several minutes.

2. Open the result on the host system

Copy the result to the host system using SSH or a similar method.
[Optional] Finalize the result by providing the result file and search directories to the binaries of interest if the module paths are different from the target system. For example:
vtune
-finalize -r
<my_result_dir>
-search-dir
<my_binary_dir>

3. Open and interpret analysis results

View results in the command line by running a command to generate a report based on the data collected. For example, the following command creates a hotspots report:
vtune
-report hotspots -r
<my_result_dir>
Launch
Intel VTune
Profiler
on the host system and view the result file.
Open
Intel VTune
Profiler
.
Use the open result action on the toolbar or from the menu button to browse to the result file.
Analyze the results and make optimizations to your application.
HPC Performance Characterization Data View
Memory Usage Data View
Hotspots Data View
Microarchitecture Exploration Data View