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client: chunked writes

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This client-side code alone improves the typical transfer speed of a
51572-byte file from 91.85 seconds to 25.89 seconds.

This appears to be heavily bottlenecked by the python side of the
transfer--increasing the serial line speed has nearly zero affect on
the total transfer time.
This commit is contained in:
Zack Buhman 2024-03-13 21:29:12 +08:00
parent d912278afd
commit 328e9e18bd
1 changed files with 11 additions and 4 deletions
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15
client.py
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@ -31,18 +31,25 @@ def sync(ser, b, wait=0.1):
def symmetric(ser, b): def symmetric(ser, b):
l = [] l = []
for i, c in enumerate(b): mem = memoryview(b)
if i % 32 == 0: i = 0
chunk_size = 16
while i < len(b):
if i % 128 == 0:
print(i, end=' ') print(i, end=' ')
sys.stdout.flush() sys.stdout.flush()
while True: while True:
if ser.in_waiting: if ser.in_waiting:
res = ser.read(ser.in_waiting) res = ser.read(ser.in_waiting)
l.extend(res) l.extend(res)
if len(l) + 8 >= i: if len(l) + chunk_size >= i:
break break
ser.write(bytes([c])) chunk_size = min(chunk_size, len(b) - i)
assert chunk_size > 0, chunk_size
ser.write(b[i:i+chunk_size])
i += chunk_size
time.sleep(0.1) time.sleep(0.1)
res = ser.read(ser.in_waiting) res = ser.read(ser.in_waiting)