Visible to Intel only — GUID: GUID-907742BC-012C-466D-8258-F83D5CAC7C2E
Performance-Related Configuration Variables on CPU
The following variables enable you to configure aspects of the OIntel® CPU Runtime for OpenCL™ Applications.
The default configuration offers the most stable performance.
| Variable | Value Type | Default Value | Description |
|---|---|---|---|
| CL_CONFIG_USE_FAST_RELAXED_MATH | Boolean | False | If set to True, building kernels occurs with -cl-fast-relaxed-math build option, which enables optimizations for floating-point arithmetic that may violate the IEEE 754 standard and the OpenCL™ numerical compliance requirements. |
| CL_CONFIG_CPU_RT_LOOP_UNROLL_FACTOR | Integer | 2 | Defines a loop unrolling factor for loops with non-constant trip-count. Allowed values: [1,16]. Out of bounds values are clamped. 1: disabled. Example values: 1, 2, 3, 16. |
| CL_CONFIG_USE_VECTORIZER | Boolean | Affects the behavior of the vectorizer of the entire system (or shell instances) until variable gets unset explicitly (or shell(s) terminates). | |
| CL_CONFIG_CPU_VECTORIZER_MODE | Integer | 0 | Sets the vectorization “width” (when CL_CONFIG_USE_VECTORIZER = True). Allowed values: 0,1,4,8,16 0: the compiler makes heuristic decisions whether to vectorize each kernel, and if so, which vector width to use. 1: no vectorization is done by compiler. Explicit vector data types in kernels are left intact (the same as CL_CONFIG_USE_VECTORIZER = False). |
| CL_CONFIG_CPU_TARGET_ARCH | String | Autodetect | Generates code exclusively for a given target CPU architecture. Allows only lowering the instruction set level supported by CPU. Allowed values:
|