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explain why CPU affinity is a good idea
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@ -153,10 +153,18 @@ class ServerConfig(Config):
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# bit corresponding to the first logical CPU and the highest order bit
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# corresponding to the last logical CPU. Not all CPUs may exist on a
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# given system but a mask may specify more CPUs than are present.
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#
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# For example:
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# 0x00000001 is processor #0,
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# 0x00000003 is processors #0 and #1,
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# 0xFFFFFFFF is all processors (#0 through #31).
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#
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# This is desirable for Synapse processes (especially workers), which are
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# inherently single-threaded due to the GIL and can suffer a 30-40% slowdown
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# due to cache blow-out and thread context switching if the scheduler happens
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# to schedule the underlying threads across different cores.
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# See https://www.mirantis.com/blog/improve-performance-python-programs-restricting-single-cpu/
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#
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# cpu_affinity: 0xFFFFFFFF
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# Whether to serve a web client from the HTTP/HTTPS root resource.
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