Environment Variables
The table below lists
environment variables to control runs of the Intel Distribution for LINPACK Benchmark.
Intel® oneAPI Math Kernel Library
Environment Variable
| Description
| Value
|
|---|---|---|
HPL_LARGEPAGE | Defines the memory mapping to be used for the Intel® Xeon® processor.
| 0 or 1:
|
HPL_LOG | Controls the level of detail for the HPL output.
| An integer ranging from 0 to 2:
|
HPL_HOST_CORE ,
HPL_HOST_NODE | Specifies cores or Non-Uniform Memory Access (NUMA) nodes to be used.
HPL_HOST_NODE requires NUMA mode to be enabled. You can check whether it is enabled by the
numactl –-hardware command.
The default behavior is auto-detection of the core or NUMA node.
| A list of integers ranging from 0 to the largest number of a core or NUMA node in the cluster and separated as explained in
example 3.
|
HPL_SWAPWIDTH | Specifies width for each swap operation.
| 16 or 24. The default is 24.
|
You can set Intel Distribution for LINPACK Benchmark environment variables using the
PMI_RANK
and
PMI_SIZE
environment variables of the Intel MPI library, and you can create a shell script to automate the process.
Examples of Environment Settings
#
| Settings
| Behavior of the Intel Distribution for LINPACK Benchmark
|
|---|---|---|
1
| Nothing specified
| All Intel® Xeon® processors in the cluster are used.
|
2
| HPL_MIC_DEVICE =0,2HPL_HOST_CORE =1-3,8-10
| Intel® Xeon® processor cores 1,2,3,8,9, and 10 are used.
|
3
| HPL_HOST_NODE =1
| Only Intel® Xeon® processor cores on NUMA node 1 are used.
|
Product and Performance Information
|
|---|
Performance varies by use, configuration and other factors. Learn more at
www.Intel.com/PerformanceIndex.
Notice revision #20201201
|