Instance Property

kernelStartTime

The host time, in seconds, when the CPU began scheduling this command buffer for execution.

Required.

Declaration

@property(readonly) CFTimeInterval kernelStartTime;

Discussion

This value can be used with the kernelEndTime property to obtain optional timestamp reflection data. Both properties are typically queried in the addScheduledHandler: callback, or after a call to the waitUntilScheduled method.

This value is 0.0 if the CPU has not yet scheduled the command buffer for execution. The default value is 0.0.

See Also

Obtaining Status and Timestamps

status

The current stage in the lifetime of the command buffer.

Required.

MTLCommandBufferStatus

The stages in the lifetime of the command buffer.

error

The error that occurred when the command buffer was executed.

Required.

MTLCommandBufferErrorDomain

The error domain used by MTLCommandBuffer when returning command buffer execution errors.

MTLCommandBufferError

Error codes that indicate why the execution of the command buffer has failed. The error property contains the error code.

kernelEndTime

The host time, in seconds, when the CPU finished scheduling this command buffer for execution.

Required.

GPUStartTime

The host time, in seconds, when the GPU began executing this command buffer.

Required.

GPUEndTime

The host time, in seconds, when the GPU finished executing this command buffer.

Required.