Re: [web-devel] Caching the System time

FWIW: we don't cache the system time because it's slow to *get* it -- we cache it because it's slow to turn it into a text string (for HTTP responses, logging, etc). It still may be a stupid thing to do, but it benchmarked faster when I wrote it. G On Fri, Aug 5, 2011 at 7:47 PM, Bryan O'Sullivan wrote:

On Fri, Aug 5, 2011 at 7:57 AM, Greg Weber wrote:

...

We are finally getting around to implementing a robust logging solution within Yesod. This creates the issue of having to frequently access the system time. I see that Snap has a separate thread to get the system time and cache the result [1].

That is an absurd non-optimisation. It costs just a few dozen nanoseconds to get the time of day under OS X, and Linux should be even cheaper since it doesn't involve a system call. It wouldn't surprise me if the approach above is actually *slower*.

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-- Gregory Collins