mirror of https://github.com/m-labs/artiq.git
coredevice.comm_kernel: performance improvement
reduced latency by busy polling, and improved byte list performance.
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43b2a3791c
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1e9a131386
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@ -66,7 +66,7 @@ def _receive_list(kernel, embedding_map):
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tag = chr(kernel._read_int8())
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if tag == "b":
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buffer = kernel._read(length)
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return [bool(a) for a in buffer]
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return list(struct.unpack(kernel.endian + "%s?" % length, buffer))
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elif tag == "i":
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buffer = kernel._read(4 * length)
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return list(struct.unpack(kernel.endian + "%sl" % length, buffer))
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@ -217,13 +217,13 @@ class CommKernel:
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def _read(self, length):
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# cache the reads to avoid frequent call to recv
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while len(self.read_buffer) < length:
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# the number is just the maximum amount
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# when there is not much data, it would return earlier
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diff = length - len(self.read_buffer)
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flag = 0
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if diff > 8192:
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flag |= socket.MSG_WAITALL
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new_buffer = self.socket.recv(8192, flag)
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while True:
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try:
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flag = socket.MSG_DONTWAIT
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new_buffer = self.socket.recv(8192, flag)
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break
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except BlockingIOError:
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pass
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if not new_buffer:
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raise ConnectionResetError("Core device connection closed unexpectedly")
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self.read_buffer += new_buffer
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