It appears you’re running examples from the first edition. For various reasons, these are obsolete.

My main OS is macos, but I’ve just tried the 2nd edition examples (the 2nd-edition branch) on Windows 10, quad core machine, Elixir 1.6 and Erlang 20.2. Here’s what I’ve got:

non ETS:

mix run -e "Bench.run(KeyValue)" 
245682 operations/sec

mix run -e "Bench.run(KeyValue, concurrency: 100)" 
317935 operations/sec

ETS:

mix run -e "Bench.run(EtsKeyValue)" 
1828488 operations/sec

mix run -e "Bench.run(EtsKeyValue, concurrency: 100)" 
3575259 operations/sec

For comparison, here’s what I’ve got on my macbook:

non ETS:

mix run -e "Bench.run(KeyValue)"
621003 operations/sec

mix run -e "Bench.run(KeyValue, concurrency: 1000)"
325055 operations/sec

ETS:

mix run -e "Bench.run(EtsKeyValue)"
3576332 operations/sec

mix run -e "Bench.run(EtsKeyValue, concurrency: 1000, num_updates: 100)"
16993927 operations/sec

There are clearly some differences between Windows/macos, which I currently can’t explain. One part of the reason could lie in the fact that the benchmark is synthetic, simplified, and originally performed on my macos machine. Regardless, the two main points hold across different OSes:

• ETS implementation is much faster than non-ETS
• ETS implementation scales better than non-ETS

Either way, your results are quite strange, since performance degrades significantly with increased concurrency. I wonder if your Erlang installation is taking advantage of multiple cores at all? What’s the result of System.schedulers and System.schedulers_online?

Found the problem after running GitHub version. It was stupid error on my side. Reporting was not taking into account number of concurrent clients.

Sorry for wasting everybody’s time.

maybe that link helps you

https://github.com/sasa1977/elixir-in-action/issues/16