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Merged
cvik merged 3 commits into from
Mar 8, 2026
Merged

Switch benchmarks to ArenaAllocator, ~100x faster results #1

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Switch benchmarks to ArenaAllocator, ~100x faster results
Mar 8, 2026
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38 changes: 19 additions & 19 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -87,28 +87,28 @@ AMD Ryzen AI MAX+ 395, 32 threads, 112 GiB RAM, Linux 6.18.9

```
Decode:
minimal (4B header only) 25 ns/op 39972777 ops/s
small (token + 1 option) 8963 ns/op 111562 ops/s
multi-option (3 opts + payload) 9277 ns/op 107786 ops/s
host+path (2 options) 8955 ns/op 111658 ops/s
payload (ACK + 12B body) 4786 ns/op 208939 ops/s
extended delta (opt 258) 9018 ns/op 110885 ops/s
minimal (4B header only) 26 ns/op 37546680 ops/s
small (token + 1 option) 90 ns/op 10989830 ops/s
multi-option (3 opts + payload) 190 ns/op 5260000 ops/s
host+path (2 options) 138 ns/op 7198226 ops/s
payload (ACK + 12B body) 38 ns/op 26128314 ops/s
extended delta (opt 258) 86 ns/op 11540017 ops/s

Encode (read + write):
minimal (4B header only) 4932 ns/op 202749 ops/s
small (token + 1 option) 14993 ns/op 66697 ops/s
multi-option (3 opts + payload) 15110 ns/op 66178 ops/s
host+path (2 options) 14790 ns/op 67609 ops/s
payload (ACK + 12B body) 9761 ns/op 102442 ops/s
extended delta (opt 258) 14781 ns/op 67651 ops/s
minimal (4B header only) 32 ns/op 30992027 ops/s
small (token + 1 option) 106 ns/op 9370659 ops/s
multi-option (3 opts + payload) 216 ns/op 4628666 ops/s
host+path (2 options) 159 ns/op 6265900 ops/s
payload (ACK + 12B body) 46 ns/op 21709709 ops/s
extended delta (opt 258) 104 ns/op 9615095 ops/s

Round-trip (decode + encode + decode):
minimal (4B header only) 4964 ns/op 201419 ops/s
small (token + 1 option) 24228 ns/op 41273 ops/s
multi-option (3 opts + payload) 24685 ns/op 40509 ops/s
host+path (2 options) 24183 ns/op 41351 ops/s
payload (ACK + 12B body) 14755 ns/op 67771 ops/s
extended delta (opt 258) 24164 ns/op 41382 ops/s
minimal (4B header only) 58 ns/op 17071762 ops/s
small (token + 1 option) 195 ns/op 5105325 ops/s
multi-option (3 opts + payload) 404 ns/op 2471514 ops/s
host+path (2 options) 296 ns/op 3370795 ops/s
payload (ACK + 12B body) 76 ns/op 13025843 ops/s
extended delta (opt 258) 188 ns/op 5294927 ops/s
```

Note: benchmarks use `page_allocator`; real workloads with arena/pool allocators will be significantly faster.
Benchmarks use `ArenaAllocator` with retained capacity (reset per iteration, no syscalls after warmup).
18 changes: 9 additions & 9 deletions src/bench.zig
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Expand Up @@ -90,39 +90,39 @@ const doNotOptimize = std.mem.doNotOptimizeAway;

fn decodeBench(comptime msg: []const u8) fn () void {
return struct {
var arena = std.heap.ArenaAllocator.init(std.heap.page_allocator);
fn run() void {
const alloc = std.heap.page_allocator;
_ = arena.reset(.retain_capacity);
const alloc = arena.allocator();
const pkt = Packet.read(alloc, msg) catch unreachable;
doNotOptimize(pkt);
pkt.deinit();
}
}.run;
}

fn encodeBench(comptime msg: []const u8) fn () void {
return struct {
var arena = std.heap.ArenaAllocator.init(std.heap.page_allocator);
fn run() void {
const alloc = std.heap.page_allocator;
_ = arena.reset(.retain_capacity);
const alloc = arena.allocator();
const pkt = Packet.read(alloc, msg) catch unreachable;
const encoded = pkt.write() catch unreachable;
doNotOptimize(encoded);
alloc.free(encoded);
pkt.deinit();
}
}.run;
}

fn roundtripBench(comptime msg: []const u8) fn () void {
return struct {
var arena = std.heap.ArenaAllocator.init(std.heap.page_allocator);
fn run() void {
const alloc = std.heap.page_allocator;
_ = arena.reset(.retain_capacity);
const alloc = arena.allocator();
const pkt = Packet.read(alloc, msg) catch unreachable;
const encoded = pkt.write() catch unreachable;
const pkt2 = Packet.read(alloc, encoded) catch unreachable;
doNotOptimize(pkt2);
pkt2.deinit();
alloc.free(encoded);
pkt.deinit();
}
}.run;
}
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