7. System hardware testing
rack_tool is a utility that is supplied with the IPU-M2000 system software pack. It is always installed in the account that is performing IPU resource management (the default is the
ipuuser account) as
rack_tool is used for the following:
BIST: Perform hardware tests on one or more IPU-M2000s (see Running system self-tests for the built-in self-test capabilities)
Querying the running software version of all IPU-M2000s.
Testing connectivity to RNIC, IPU-Gateway and BMC ports on all IPU-M2000 listed in rack_tool’s config file. This config file is setup by the IPU-POD DA install script
Restarting IPU-M2000’s IPU-Gateway and BMC CPU systems in different ways (power cycling or OS reboot)
Control power on/off for the IPU-Gateway part of the IPU-M2000(s)
Running commands on several IPU-M2000s for troubleshooting
Updating the “root overlay” files onto all IPU-M2000s if NTP or syslog server has changed
The supported options will evolve over time so you should refer to the official help menu by running
rack_tool --help. This will help identify the installed version and a more detailed help for this version can be obtained from the
rack_tool online documentation page. Select the version that your tool reports.
7.2. Running system self-tests
There are two parts to testing the IPU-POD DA system: running built-in hardware self-tests (BIST) and checking the system using the V-IPU management tool. The commands for doing so are:
$ rack_tool bist
performs BMC BIST hardware testing
$ sudo ~/IPU_M_SW-<version>/direct-attach-setup install
performs V-IPU self-tests again as part of the install
Running any of these commands will affect any ML jobs that are running and will cause undefined behaviour. Therefore Poplar workloads should NOT be running when performing these tests.
This section contains useful information about what to do if you encounter problems while installing and testing the rack. If you can’t find the answer to your query here and are still experiencing problems, then contact your Graphcore representative or use the resources on the Graphcore support portal: https://www.graphcore.ai/support.
7.3.1. BMC built in hardware test
$ ./rack_tool.py BIST
This test will generate a very low-level hardware verification report/log that will need to be analyzed by Graphcore support if any errors are reported. The logs are located at
./maintenance_tools/logs relative to the current directory from which the command is executed.
The command “Done BIST on …” if the test is successful.
The command “Failed BIST on …” if the test fails.
The command will point to the log name generated in both cases.
Running this command will affect any ML jobs that are running and will cause undefined behaviour. Therefore Poplar workloads should NOT be running when performing this test.
7.3.2. V-IPU cluster tests
The cluster tests check that the cables are properly inserted, that the cabling is correct with respect to the expected topology, and perform traffic tests on the links in the topology.
V-IPU-based cluster tests are only supported as an integral test step when running the IPU-POD DA install script. If this install script is run again the previous configuration input will be retained and the script will allow a new cluster test to be executed.
Running these tests will affect any ML jobs that are running and will cause undefined behaviour. Therefore Poplar workloads should NOT be running when performing these tests.