This is a rough implementation of a NIF that takes IOData to see how the various ways of passing IOData compare.
It tries out:
- Passing IOData unchanged to the NIF and calling
enif_inspect_iolist_as_binary - Converting the IOData to a binary and passing the the binary to the NIF
- Converting the IOData to an iovec and using
enif_inspect_iovecto get an iovec out
TL;DR: For the small IOData buffers that I'm interested in at the moment,
enif_inspect_iolist_as_binary is faster than converting to a binary and using
that or converting to an iovec and using enif_inspect_iovec. Everything is so
fast that if you enable the ERL_NIF_DIRTY_JOB_IO_BOUND flag for the functional
call, like you were actually going to make a blocking call, the additional
processing adds too much variability to the test to get a good result.
Operating System: Linux
CPU Information: AMD Ryzen Threadripper 2950X 16-Core Processor
Number of Available Cores: 32
Available memory: 31.20 GB
Elixir 1.14.3
Erlang 25.2
Benchmark suite executing with the following configuration:
warmup: 1 s
time: 1 s
memory time: 0 ns
reduction time: 0 ns
parallel: 1
inputs: binary, iodata, iovec
Estimated total run time: 18 s
Benchmarking inspect_binary with input binary ...
Benchmarking inspect_binary with input iodata ...
Benchmarking inspect_binary with input iovec ...
Benchmarking inspect_iolist_as_binary with input binary ...
Benchmarking inspect_iolist_as_binary with input iodata ...
Benchmarking inspect_iolist_as_binary with input iovec ...
Benchmarking inspect_iovec with input binary ...
Benchmarking inspect_iovec with input iodata ...
Benchmarking inspect_iovec with input iovec ...
##### With input binary #####
Name ips average deviation median 99th %
inspect_binary 8.00 M 124.98 ns ±613.80% 120 ns 180 ns
inspect_iolist_as_binary 7.55 M 132.49 ns ±791.81% 121 ns 241 ns
inspect_iovec 6.92 M 144.52 ns ±457.47% 131 ns 271 ns
Comparison:
inspect_binary 8.00 M
inspect_iolist_as_binary 7.55 M - 1.06x slower +7.51 ns
inspect_iovec 6.92 M - 1.16x slower +19.54 ns
##### With input iodata #####
Name ips average deviation median 99th %
inspect_iolist_as_binary 4.10 M 244.02 ns ±229.25% 240 ns 340 ns
inspect_binary 2.17 M 459.90 ns ±4822.11% 331 ns 632 ns
inspect_iovec 1.37 M 729.11 ns ±3557.07% 541 ns 812 ns
Comparison:
inspect_iolist_as_binary 4.10 M
inspect_binary 2.17 M - 1.88x slower +215.88 ns
inspect_iovec 1.37 M - 2.99x slower +485.09 ns
##### With input iovec #####
Name ips average deviation median 99th %
inspect_iolist_as_binary 4.30 M 232.83 ns ±3462.04% 221 ns 320 ns
inspect_binary 1.92 M 521.62 ns ±4369.51% 331 ns 1383 ns
inspect_iovec 1.86 M 536.25 ns ±2394.14% 471 ns 1072 ns
Comparison:
inspect_iolist_as_binary 4.30 M
inspect_binary 1.92 M - 2.24x slower +288.79 ns
inspect_iovec 1.86 M - 2.30x slower +303.43 ns
Operating System: Linux
CPU Information: AMD Ryzen Threadripper 2950X 16-Core Processor
Number of Available Cores: 32
Available memory: 31.20 GB
Elixir 1.14.3
Erlang 25.2
Benchmark suite executing with the following configuration:
warmup: 1 s
time: 1 s
memory time: 0 ns
reduction time: 0 ns
parallel: 1
inputs: binary, iodata, iovec
Estimated total run time: 18 s
Benchmarking inspect_binary with input binary ...
Benchmarking inspect_binary with input iodata ...
Benchmarking inspect_binary with input iovec ...
Benchmarking inspect_iolist_as_binary with input binary ...
Benchmarking inspect_iolist_as_binary with input iodata ...
Benchmarking inspect_iolist_as_binary with input iovec ...
Benchmarking inspect_iovec with input binary ...
Benchmarking inspect_iovec with input iodata ...
Benchmarking inspect_iovec with input iovec ...
##### With input binary #####
Name ips average deviation median 99th %
inspect_iolist_as_binary 8.13 M 123.05 ns ±110.02% 120 ns 171 ns
inspect_binary 7.75 M 129.11 ns ±27.01% 121 ns 220 ns
inspect_iovec 3.59 M 278.29 ns ±3474.84% 240 ns 671 ns
Comparison:
inspect_iolist_as_binary 8.13 M
inspect_binary 7.75 M - 1.05x slower +6.05 ns
inspect_iovec 3.59 M - 2.26x slower +155.23 ns
##### With input iodata #####
Name ips average deviation median 99th %
inspect_iolist_as_binary 4.03 M 247.83 ns ±20.42% 241 ns 341 ns
inspect_binary 3.88 M 257.88 ns ±2068.21% 201 ns 411 ns
inspect_iovec 2.03 M 492.02 ns ±1088.37% 441 ns 1152 ns
Comparison:
inspect_iolist_as_binary 4.03 M
inspect_binary 3.88 M - 1.04x slower +10.05 ns
inspect_iovec 2.03 M - 1.99x slower +244.19 ns
##### With input iovec #####
Name ips average deviation median 99th %
inspect_binary 6.19 M 161.49 ns ±5718.69% 130 ns 321 ns
inspect_iolist_as_binary 4.70 M 212.98 ns ±3767.72% 201 ns 271 ns
inspect_iovec 2.10 M 476.91 ns ±2636.68% 431 ns 1042 ns
Comparison:
inspect_binary 6.19 M
inspect_iolist_as_binary 4.70 M - 1.32x slower +51.49 ns
inspect_iovec 2.10 M - 2.95x slower +315.42 ns