$ mix bench
Compiling 1 file (.ex)
Not all of your protocols have been consolidated. In order to achieve the
best possible accuracy for benchmarks, please ensure protocol
consolidation is enabled in your benchmarking environment.

Operating System: Linux
CPU Information: Intel(R) Core(TM) i7-4710MQ CPU @ 2.50GHz
Number of Available Cores: 8
Available memory: 15.52 GB
Elixir 1.10.3
Erlang 23.0

Benchmark suite executing with the following configuration:
warmup: 10 s
time: 30 s
memory time: 5 s
parallel: 8
inputs: Large map
Estimated total run time: 2.25 min

Benchmarking :maps.fold with input Large map...
Benchmarking Enum.reduce with input Large map...
Benchmarking IterReduce.iter_reduce with input Large map...

##### With input Large map #####
Name                             ips        average  deviation         median         99th %
Enum.reduce                     1.09      917.60 ms    ±15.64%      911.89 ms     1224.08 ms
IterReduce.iter_reduce          1.07      935.28 ms    ±17.72%      934.53 ms     1241.06 ms
:maps.fold                      1.06      940.14 ms    ±15.81%      935.02 ms     1249.78 ms

Comparison:
Enum.reduce                     1.09
IterReduce.iter_reduce          1.07 - 1.02x slower +17.68 ms
:maps.fold                      1.06 - 1.02x slower +22.53 ms

Memory usage statistics:

Name                      Memory usage
Enum.reduce                  114.39 MB
IterReduce.iter_reduce       114.46 MB - 1.00x memory usage +0.0718 MB
:maps.fold                   114.41 MB - 1.00x memory usage +0.0214 MB

**All measurements for memory usage were the same**