Redis Performance Debugging

[Raunak Bhansali]

I am trying to benchmark redis SUNION command. While benchmarking one of the sets contains ~ 1000 elements and other contains ~10 elements.

The order of execution is around 0.52 ms per call.

Is this performance ideal or am I missing out on some tuning settings in the conf file.

[Itamar Haber]

Hello Raunak,

I don't know if the performance is ideal (sounds great, less than 1ms is great in my book, but it really depends on your requirements).

I've performed the below test on my laptop:

    $ for i in `seq 0 999`; do redis-cli sadd s1000 forbar$i; done

    ...

    $ for i in `seq 0 9`; do redis-cli sadd s10 foobar$i; done

    ...

    $ redis-benchmark SUNION s1000 s10

    ...

    100.00% <= 56 milliseconds

    1171.37 requests per second

    $ redis-benchmark SUNION s1000

    ...

    100.00% <= 57 milliseconds

    1062.70 requests per second

    $ redis-benchmark SMEMBERS s1000

    100.00% <= 19 milliseconds

    3300.33 requests per second

    $ redis-benchmark SINTER s1000

    100.00% <= 17 milliseconds

    3311.26 requests per second

These results (and some digging into the code) show that:

1. SUNION is slower than just getting the members of a set (SMEMBERS uses the same implementation as SINTER).

2. Iterating and replying with 1000 elements takes at least 17-19ms

3. The difference between SUNION and the others is not in orders of magnitude, which is good, but perhaps requires some optimizations in the Redis code (at least for this edge case).

xref: https://stackoverflow.com/questions/52238376/redis-sets-performance-issue

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Itamar Haber Technicalist Evangenly Phone: +972.54.567.9692