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fscache: enable multi-threading to process fscache requests
Add command line option "fscache-threads" to nydusd to support multi-threading for fscache service. There's one thread to receive fscache request from cachefile fd, and dispatch `READ` requests to multiple working threads through a multi-producer, multi-consumer channel. We have observed about 40% performance boost when serving some multi threading container workloads. Signed-off-by: Jiang Liu <gerry@linux.alibaba.com>
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