phantom/bitcoin
1
0
Fork 0
mirror of https://github.com/bitcoin/bitcoin.git synced 2025-01-27 03:33:27 -03:00
Code Issues Projects Releases Packages Wiki Activity Actions

bench: Make Xor benchmark more representative

Browse source 
To make the benchmarks representative, I've collected the write-vector's sizes during IBD for every invocation of `util::Xor` until 860k blocks, and used it as a basis for the micro-benchmarks, having a similar distribution of random data (taking the 1000 most frequent ones, making sure the very big ones are also covered).

And even though we already have serialization tests, `AutoFileXor` was added to serializing 1 MB via the provided key_bytes.
This was used to test the effect of disabling obfuscation.

>  cmake -B build -DBUILD_BENCH=ON -DCMAKE_BUILD_TYPE=Release \
&& cmake --build build -j$(nproc) \
&& build/src/bench/bench_bitcoin -filter='XorHistogram|AutoFileXor' -min-time=10000

C++ compiler .......................... AppleClang 16.0.0.16000026

|             ns/byte |              byte/s |    err% |     total | benchmark
|--------------------:|--------------------:|--------:|----------:|:----------
|                1.07 |      937,527,289.88 |    0.4% |     10.24 | `AutoFileXor`
|                0.87 |    1,149,859,017.49 |    0.3% |     10.80 | `XorHistogram`

C++ compiler .......................... GNU 13.2.0

|             ns/byte |              byte/s |    err% |        ins/byte |        cyc/byte |    IPC |       bra/byte |   miss% |     total | benchmark
|--------------------:|--------------------:|--------:|----------------:|----------------:|-------:|---------------:|--------:|----------:|:----------
|                1.87 |      535,253,389.72 |    0.0% |            9.20 |            3.45 |  2.669 |           1.03 |    0.1% |     11.02 | `AutoFileXor`
|                1.70 |      587,844,715.57 |    0.0% |            9.35 |            5.41 |  1.729 |           1.05 |    1.7% |     10.95 | `XorHistogram`
This commit is contained in:
Lőrinc 2024-12-06 16:18:03 +01:00
parent ae75c72db5
commit df516ee5e3
1 changed files with 12 additions and 5 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

17
src/bench/xor.cpp
View file

@ -7,17 +7,24 @@
#include <span.h> #include <span.h>
#include <streams.h> #include <streams.h>
#include <cmath>
#include <cstddef> #include <cstddef>
#include <map>
#include <vector> #include <vector>
static void Xor(benchmark::Bench& bench) static void Xor(benchmark::Bench& bench)
{ {
FastRandomContext frc{/*fDeterministic=*/true}; FastRandomContext rng{/*fDeterministic=*/true};
auto data{frc.randbytes<std::byte>(1024)}; auto test_data{rng.randbytes<std::byte>(1 << 20)};
auto key{frc.randbytes<std::byte>(31)};
bench.batch(data.size()).unit("byte").run([&] { std::vector key_bytes{rng.randbytes<std::byte>(8)};
util::Xor(data, key); uint64_t key;
std::memcpy(&key, key_bytes.data(), 8);
size_t offset{0};
bench.batch(test_data.size()).unit("byte").run([&] {
util::Xor(test_data, key_bytes, offset++);
ankerl::nanobench::doNotOptimizeAway(test_data);
}); });
} }