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import pyopencl as cl
import pyopencl.characterize.performance as perf
def main():
ctx = cl.create_some_context()
prof_overhead, latency = perf.get_profiling_overhead(ctx)
print("command latency: %g s" % latency)
print("profiling overhead: {:g} s -> {:.1f} %".format(
prof_overhead, 100*prof_overhead/latency))
queue = cl.CommandQueue(
ctx, properties=cl.command_queue_properties.PROFILING_ENABLE)
print("empty kernel: %g s" % perf.get_empty_kernel_time(queue))
print("float32 add: %g GOps/s" % (perf.get_add_rate(queue)/1e9))
for tx_type in [
perf.HostToDeviceTransfer,
perf.DeviceToHostTransfer,
perf.DeviceToDeviceTransfer]:
print("----------------------------------------")
print(tx_type.__name__)
print("----------------------------------------")
print("latency: %g s" % perf.transfer_latency(queue, tx_type))
for i in range(6, 31, 2):
bs = 1 << i
try:
result = "%g GB/s" % (
perf.transfer_bandwidth(queue, tx_type, bs)/1e9)
except Exception as e:
result = "exception: %s" % e.__class__.__name__
print("bandwidth @ %d bytes: %s" % (bs, result))
if __name__ == "__main__":
main()
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