trace.py 文件源码

def trace(self, signum, frame):  # pylint: disable=unused-argument
            """ Signal handler used to take snapshots of the running process. """

            # the last pending signal after trace_stop
            if not self.profiling:
                return

            gc.collect()

            snapshot = tracemalloc.take_snapshot()
            timestamp = time.time()
            sample_data = (timestamp, snapshot)

            # *Must* use the HIGHEST_PROTOCOL, otherwise the serialization will
            # use GBs of memory
            pickle.dump(sample_data, self.trace_stream, protocol=pickle.HIGHEST_PROTOCOL)
            self.trace_stream.flush()