Set fullsweep_after=0 on the writer process #166
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This seems to increase throughput by ~10% on OTP26 and even more on OTP27. In particular, it seems to solve the performance regression with small messages on OTP 27:
stream-perf-test -s 100 results (single node, everything local): OTP26 as-is: 880k
OTP26, fullsweep_after 0: 940k
OTP27 as-is: 750k
OTP27 fullsweep_after 0: 1M