= OpenCL CPU applications =

OpenCL, which is used for GPU applications, can also be used for multicore CPU applications.

Depending on what drivers are installed on a client computer,
one or more OpenCL implementations may be available.
When you build OpenCL/CPU applications,
they may be compatible with only one implementation,
or there may be a preferred implementation.

You can use the plan class mechanism to control what
app versions are sent.
Your app plan function can call
{{{
bool HOST::get_cpu_opencl_prop(const char* vendor, OPENCL_CPU_PROP&);
}}}
to see if the host has an OpenCL/CPU implementation
for the given vendor ("nvidia", "amd", or "intel").
If so, the OpenCL properties are returned.

Use this function as follows:
{{{
bool app_plan_opencl_cpu_intel(SCHEDULER_REQUEST& sreq, HOST_USAGE& hu) {
    OPENCL_CPU_PROP ocp;
    if (sreq.host.get_cpu_opencl_prop("intel", ocp)) {
        ... host has Intel OpenCL/CPU implementation
        if (!strstr(sreq.host.p_feature,"sse4.1")) {
            // interesting factoid: Intel's OpenCL/CPU implementation requires SSE4.1
            return false;
        }
    }
    ...
}
}}}