Intel® Fortran Compiler 16.0 User and Reference Guide
This topic only applies to Intel® Many Integrated Core Architecture (Intel® MIC Architecture).
Each CPU thread that offloads code executes the offloaded code in a coprocessor thread dedicated to that CPU thread. The default stack size for that coprocessor thread is fairly small, 2 MB.
To increase the stack size allocated to offloaded code, set the environment variable MIC_STACKSIZE to a size sufficient for the offloaded code. MIC_STACKSIZE is always honored. It does not require the variable MIC_ENV_PREFIX to be set.
Specify the value for MIC_STACKSIZE as follows:
|
integerB |
A value, in bytes. |
|
integerK |
A value, in kilobytes. |
|
integerM |
A value, in megabytes. |
|
integerG |
A value, in gigabytes. |
|
integerT |
A value, in terabytes. |
For example, the following shell BASH and C shell commands set the maximum stacksize for the main coprocessor thread to 50MB:
export MIC_STACKSIZE=50M #(BASH shell) setenv MIC_STACKSIZE 50M #(C shell)
OpenMP* runtime libraries have their own environment variables for adjusting the sizes of the stacks used by additional OpenMP threads. MIC_STACKSIZE does not apply to such threads. For example, to increase the available stack size for every OpenMP thread except the main thread to 3 MB using the BASH shell, enter: export OMP_STACKSIZE=3M (affects OpenMP threads on both host and coprocessor) or export MIC_ENV_PREFIX=ABC export ABC_OMP_STACKSIZE=3M (affects coprocessor OpenMP threads only).