kernelStartTime
The host time, in seconds, when the CPU begins to schedule the command buffer.
Declaration
var kernelStartTime: CFTimeInterval { get }Discussion
You can calculate how much time the kernel spends scheduling a command buffer by subtracting this value from kernelEndTime.
The kernel start and end times remain 0.0 until the GPU driver (on the CPU) schedules the command buffer to run on the GPU. Apps typically use these values after the waitUntilScheduled() method returns, or within a completion handler (see addScheduledHandler(_:) and addCompletedHandler(_:)).