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Editorial Team
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Asked: 2026-05-23T14:00:23+00:00

I would think the the redis test would be at least equally as fast

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I would think the the redis test would be at least equally as fast as doing a hash lookup in an object.

An object looking up a value from a hash

ruby-1.9.2-p180 :022 > quick(1000) {@p.lookup(:summary_header)}   #=> nil
Rehearsal ------------------------------------
   0.000000   0.010000   0.010000 (  0.006522)
--------------------------- total: 0.010000sec

       user     system      total        real
   0.010000   0.000000   0.010000 (  0.006701)

vs a simple Redis lookup

ruby-1.9.2-p180 :023 > quick(1000) {r.get("header")}   #=> nil
Rehearsal ------------------------------------
   0.020000   0.020000   0.040000 (  0.088880)
--------------------------- total: 0.040000sec

       user     system      total        real
   0.030000   0.020000   0.050000 (  0.085839)
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1 Answer

  1. Editorial Team

    Redis is fast, but it can’t be as fast as a direct memory access. It requires constructing a request, posting it, waiting for a response, decoding that response, and returning that value to your application. Redis runs as a separate process, so you will have to pay this price for inter-process communication even when it is located on the same machine.

    That it is only twelve times slower by your benchmark is still impressive.

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