CODEWITHSUNDEEP
opencl
user1235183
user1235183

Reputation: 3072

OpenCL: Determine if a Device is already running

First, i'm relativly new to OpenCL.

Question 1: Is there a way to determine at runtime if a device is already running another kernel.

My Use-Case: i've a host programm asynchron calling different OpenCL function, which may or may not use the same Device. There a functions which can run acceptable fast on CPU, so waiting for the Device to be ready can be a bottleneck. I want to determine if the Device is already in use, and if so run a fallback function on the CPU.

Question 2: If the anwser to Question 1 is no. Is there any other possibility, than writing my own Device-Class?

Upvotes: 0

Views: 386

Answers (1)

jprice
jprice

Reputation: 9925

There is no dedicated API for querying whether a device is currently executing a kernel, but you can implement this yourself using event objects.

Whenever you enqueue a kernel, you can optionally retrieve an event object which identifies that command. Using clGetEventInfo and the CL_EVENT_COMMAND_EXECUTION_STATUS query, you can check whether a particular command has finished executing. By keeping a reference to the event object for the most recently enqueued kernel, you can use this API to check whether or not a device currently has pending kernel commands in its queue.

Of course, this only allows you to determine if there are pending kernels from your application - there is no way to check whether there are pending kernels from other OpenCL applications that might also be running on the system.

Upvotes: 1

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