[erlang-questions] ETS’s performances and limits?

[ANTHONY MOLINARO]

Hi,

The simple answer is yes, but there’s some complications under scale.

I’ve got a few ordered_sets with ~12 million entries in them which seem to work reasonably well under normal loads, but they tend to show abnormal performance under heavier concurrency.

This is a known limitation which AFAIK has not been addressed yet (https://www.youtube.com/watch?v=40shUKSdh1A <https://www.youtube.com/watch?v=40shUKSdh1A>) in the implementation of ordered_sets (I’d love to be told differently, but looking at the code it does not appear to have been changed in some time).

I don’t believe that sets have the same issue.  In all likelihood things will work fine for your use case, and you can test it out easily enough.

HTH,

-Anthony

> On Sep 1, 2018, at 1:53 PM, Frank Muller <frank.muller.erl@REDACTED> wrote:
> 
> Hi,
> 
> Is ETS capable of handling 1 million key/value (or more)? My keys are 36B and all my values are local PIDs. My ETS is mostly read-only!!!
> 
> What’s the largest ETS one has to deal with?
> Is there any limitations or point when the ETS’s perf degrades?
> 
> I’m on CentOS7, Erlang 20.x & 21.x with 256GB of RAM.
> 
> /Frank 
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