in sequence and independently. This statement is concordant with the bit of the PTX documentation"d by talonmies. Thus, if any thread medieval museum stockholm öppettider in a warp executes a bar instruction, it is as if all the threads in the warp have executed the bar instruction.
From _syncthreads it is as if all the threads in the warp have. This also supposes that _syncthreads will always generate a simple nc a; PTX instruction and that the semantics of that will not change either, so don't do this in production. This part is not undefined behavior, at least not with Parallel Thread Execution ISA Version.2.
Cuda.0, driver r331 sm_10,11,12,13, sm_20, sm_30,32,35, sm_50 PTX ISA.1 cuda.5, driver r340 sm_10,11,12,13, sm_20, sm_30,32,35,37, sm_50,52 PTX ISA.2 cuda.0, driver r346 sm_10,11,12,13, sm_20, sm_30,32,35,37, sm_50,52,53 PTX ISA.3 cuda.5, driver r352 sm_10,11,12,13, sm_20, sm_30,32,35,37, sm_50,52,53 PTX ISA.0 cuda. The API provides specialized matrix load, matrix multiply and accumulate, and matrix store operations, where each warp processes a small matrix fragment, allowing to efficiently use Tensor Cores from a cuda-C program. This will not deadlock if at least one thread per warp hits the sync, but a possible issue is order of serialization of the execution of divergent code paths. Compute Capability.x (Volta) update: With the introduction of Independent Thread Scheduling among threads in a warp, cuda is finally more strict in practice, now matching documented behavior. The last thing I want is to spread misinformation, so I'm open to discussion and revising my answer! Now, the next sentence in the"d passage does then say not to use _syncthreads in conditional code unless "it is known that all threads evaluate the condition identically (the warp does not diverge)." This seems to be an overly strict recommendation (for current architecture. Cuda Programming Guide, the actual behavior of _syncthreads may be somewhat different from how it is described and to me that is interesting. Table 29 shows the PTX release history. The tensor cores are exposed as Warp-Level Matrix Operations in the cuda 10 C API. Branch execution is serialized, so only when the branches rejoin or the code terminates do the threads in the warp then resynchronize.