Home

Some comparisons between this fast_pbkdf2, the two more downloaded implementations of pbkdf2 for both erlang and elixir in hex, respectively, and custom pbkdf2 code as was last had in MongooseIM before using fast_pbkdf2. All are run with sha256, and passwords and salt generated with base64:encode(crypto:strong_rand_bytes(16)).

With input 10000 iterations

Name	ips	average	deviation	median	99th %
fast_pbkdf2	135.49	7.38 ms	±6.26%	7.34 ms	7.77 ms
pbkdf2_elixir	18.74	53.38 ms	±3.39%	53.16 ms	56.91 ms
pbkdf2 erlang	17.46	57.26 ms	±17.27%	59.60 ms	71.71 ms
pbkdf2_erlang	7.17	139.38 ms	±1.06%	139.24 ms	147.39 ms

Comparison:

fast_pbkdf2	135.49
pbkdf2_elixir	18.74 - 7.23x slower +45.99 ms
pbkdf2 erlang	17.46 - 7.76x slower +49.88 ms
pbkdf2_erlang	7.17 - 22.92x slower +133.30 ms

Memory usage statistics:

Name	Memory usage
fast_pbkdf2	0.00007 MB
pbkdf2_elixir	1.36 MB - 19877.56x memory usage +1.36 MB
pbkdf2 erlang	2.90 MB - 42206.56x memory usage +2.90 MB
pbkdf2_erlang	3.20 MB - 46671.44x memory usage +3.20 MB

With input 1M iterations

Name	ips	average	deviation	median	99th %
fast_pbkdf2	1.35	0.74 s	±0.44%	0.74 s	0.75 s
pbkdf2_elixir	0.187	5.35 s	±0.75%	5.35 s	5.45 s
pbkdf2 erlang	0.154	6.50 s	±2.22%	6.49 s	6.79 s
pbkdf2_erlang	0.0731	13.68 s	±0.65%	13.65 s	13.85 s

Comparison:

fast_pbkdf2	1.35
pbkdf2_elixir	0.187 - 7.22x slower +4.61 s
pbkdf2 erlang	0.154 - 8.77x slower +5.76 s
pbkdf2_erlang	0.0731 - 20.89x slower +13.03 s

Memory usage statistics:

Name	Memory usage
fast_pbkdf2	0.00007 MB
pbkdf2_elixir	136.41 MB - 1986638.89x memory usage +136.41 MB
pbkdf2 erlang	289.92 MB - 4222197.89x memory usage +289.92 MB
pbkdf2_erlang	320.43 MB - 4666671.44x memory usage +320.43 MB