Running native application on Xeon-Phi
There are two ways for running native code on Intel Xeon Phi coprocessors:
- The user can log into the coprocessor using ssh and use the shell to run the application on the Phi coprocessor;
- or the user can use the micnativeloadex
utility from Xeon. It copies the native binary from Xeon to a specified
MIC (Phi coprocessor) and execute it. In addition, micnativeloadex
automatically checks library dependencies for the application, and, if
they can be located, these libraries are also copied to the device
prior to execution.
Running native application by log into MIC
The user can transfer the
executable to the coprocessor using the secure copy tool scp tool.
After that, the user can log into the coprocessor using ssh and use the
shell to run the application on the coprocessor.
Before you log into the MIC, you can configure environment variables, such as KMP_AFFINITY in this way:
In this example the coprocessor (PHI/MIC) will recognize that thread affinity was set to "balanced"
- Copy the binary code to the coprocessor, in this case, mic0:
- Connect to the mic0
- Execute your code on mic0
- Disconnect to the mic0
Library Dependence on MIC
If there is some issue about libraries dependency when you try to run
native application by log into MIC, you have to copy the missing
library to MIC. For this, go to Xeon and make copy from there.
From Xeon execute the following commands:
- Locate library_name
- scp -r /full_path/library_name mic0:~/
- connect to mic: ssh mic0
- execute you program: ./program_name arg1 arg2
library_name is the name of the missing library that you program requested.
full_path is the complete path where is you missing library.
Running native application by using micnativeloadex tool
From the Xeon host, execute this following command:
micnativeloadex ./myprogram -a "arg1 arg2" -e “environment_variable=value”
When you choose to run a native application through the micnativeloadex, you can configure the environment variables, such as KMP_AFFINITY, by using the parameter "-e".
micnativeloadex ./cge1 -a "60 10" -e "KMP_AFFINITY=balanced"
In this example, cge1 will run with two parameters (60 and 10, that are
matrix size and number of threads respectively) and set thread affinity
-a “arg1, arg2, argn”: place the arguments od your code.
-e "environment_variable" : An optional
environment string to pass to the remote app.
Multiple environment variables may be specified by using spaces as separators.
Library Dependence on micnativeloadex
micnativeloadex detects some libraries dependence, then we have to
update the SINK_LD_LIBRARY_PATH environment variable to include the
path of the missing libraries. For this, use the following command from
the Xeon host: