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Measure latency of remote object read in Redis

I have a system of multiple machines, each running a redis server which contains unique objects. A remote client can access each of these servers and read the objects.

I’m wondering to how to measure the latency of a remote read? Can I use Jedis to do it?

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  1. 0

    One of the tool you usually get when you install Redis, is redis-benchmark.
    Running a very simple test e.g. redis-benchmark -n 100000 will get you a very detailed report on the latency.

    Here is a snippet of such a report:

    $ redis-benchmark -n 100000

====== SET ======
  100007 requests completed in 0.88 seconds
  50 parallel clients
  3 bytes payload
  keep alive: 1

58.50% <= 0 milliseconds
99.17% <= 1 milliseconds
99.58% <= 2 milliseconds
99.85% <= 3 milliseconds
99.90% <= 6 milliseconds
100.00% <= 9 milliseconds
114293.71 requests per second
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  2. 0

    Since I’m interested in the latency of each and every read, I have found SLOWLOG to be useful:
    https://redis.io/commands/slowlog

    It contains the timestamp and the time it took to process the command.

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