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Reduce time spent logging EventLoop description in HTTP1ClientChannelHandler #772

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Motivation:

A performance test executing 100,000 sequential requests against a simple NIOHTTP1Server revealed that 7% of total run time is spent in the setter of the request property in HTTP1ClientChannelHandler (GitHub Issue #754).

The poor performance comes from processing the string interpolation "\(self.eventLoop)" which under the hood calls a computed property.

This problem can entirely be avoided by storing eventLoop.description when initializing HTTP1ClientChannelHandler, and using that stored value in request's setter, rather than computing the property each time.

Modifications:

  • Created a new property let eventLoopDescription: Logger.MetadataValue in HTTP1ClientChannelHandler that stores the description of the eventLoop argument that is passed into the initializer.
  • Replaced the string interpolation "\(self.eventLoop)" in request's setter with self.eventLoopDescription.

Result:

HTTP1ClientChannelHandler.eventLoop's description property is cached upon initialization rather than being computed each time in the request property's setter.

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