I am trying to familiarize myself with VTune Amplifier. I am attempting to run the "Bandwidth" test under "Microarchitecture Analysis". When I run it, the summary tab shows the "Elapsed Time" and the "Collection and Platform Info" section, but there is no "Average Bandwidth" section. When I go to the Bottom-up tab, the Bandwidth graph is empty. I assume it is not collecting memory data correctly.
This is running on Ubuntu 14.04 with the Silvermont Celeron J1900 chip. Is it because this cpu is not supported? Or am I misunderstanding what this test is supposed to do.
If the tool is not displaying a warning when you select the analysis type, it should be supported on the processor.
Questions: how long is the "elapsed time" reported by VTune Amplifier? What version of VTune Amplifier are you using (output of 'amplxe-cl -version')?
okay, that release should support what you are trying to do. However, let's verify that the VTune Amplifier drivers are loaded. As root/sudo, cd to <install-dir>/sepdk/src and execute the command './insmod-sep3 -q'.
I ran the command both as sudo and default user. Both returned:
pax driver is loaded and owned by group "vtune" with file permissions "666".
sep3_15 driver is loaded and owned by group "vtune" with file permissions "666".
vtsspp driver is loaded and owned by group "vtune" with file permissions "666".
Hello Cole B.,
Can you please verify several additional things, it will allow to figure out whether uncore events can be collected or not on your system:
From <vtune install dir>/bin64/ run:
1. >./sep -pmu-types
You should see "sa" in the output
2. >./sep -el sa
You should see "UNC_VISA_Memory_DDR_BW" in the outputed list
3. >./sep -start -d 10 -ec "UNC_VISA_Memory_DDR_BW"
The collection should generate *.tb6 file
4. > ./amplxe-cl -import ./<the tb6 file>
As result you should see a report with Uncore events collected. Something like below:
Uncore Event summary
Hardware Event Type Hardware Event Count:Self
Please provide output from each of 1-4 commands below.
I attached the outputs because the formatting was too weird otherwise. FYI, for step 3 and 4, I had to use sudo for the command to work. Step 4 also produced a lot of the "Cannot locate debugging symbols for file '...'" warnings, but I've read that is normal. It seems I am getting all 0's in the "Hardware Event Count:Self" Column.
Can you please make sure your system BIOS is configured to PerfMode as specified in this article:
If your BIOS does expose the PerfMode option, then it will likely be under a "Debug Configuration" menu
It appears that his setting is not available in my BIOS. I likely won't be able to get the right firmware, so I will look elsewhere for this type of benchmarking. Are the other tests that produce results still accurate without this setting? Is it specific to the Memory Bandwidth tests?
Hello Cole B.
It's specific to Memory Bandwidth, as on Silvermont-based platforms it requires uncore monitoring enabled.
Algorithm analsysis and core profiling should work. Let us know if you see other issues.