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fix(chainfold): memory perf #32

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Merged
rymnc merged 1 commit into from
Aug 11, 2026
Merged

fix(chainfold): memory perf #32

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47 changes: 11 additions & 36 deletions crates/chainfold/benches/apply.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -5,10 +5,8 @@ use std::hint::black_box;
use chainfold::{
Batch,
BlockRef,
BlockSpan,
Engine,
EngineConfig,
LogEvent,
test_util::NoopFold,
};
use criterion::{
Expand All @@ -24,9 +22,9 @@ const RING_CAPACITY: usize = 128;
/// Blocks the timed batch spans.
const SPAN_COUNT: u64 = 64;
/// Events carried by each timed span.
const EVENTS_PER_SPAN: u64 = 64;
const EVENTS_PER_SPAN: u32 = 64;
/// Total events the timed batch carries.
const EVENT_COUNT: u64 = SPAN_COUNT * EVENTS_PER_SPAN;
const EVENT_COUNT: u64 = SPAN_COUNT * EVENTS_PER_SPAN as u64;

/// Builds a distinguishable header for a block number.
fn block_ref(number: u64) -> BlockRef {
Expand All @@ -43,18 +41,8 @@ fn warmed_engine() -> Engine<NoopFold> {
checkpoint_slots: 0,
};
let mut engine = Engine::new(NoopFold, config).expect("engine config is valid");
let warmup = Batch {
boundary: None,
spans: vec![BlockSpan {
block: block_ref(0),
start: 0,
end: 1,
}],
events: vec![LogEvent {
log_index: 0,
event: 0,
}],
};
let mut warmup = Batch::new();
warmup.push_block(block_ref(0), [(0u32, 0u64)]);
engine
.apply_batch(&warmup)
.expect("warmup batch applies cleanly");
Expand All @@ -63,28 +51,15 @@ fn warmed_engine() -> Engine<NoopFold> {

/// Builds the batch under measurement: 4096 events over 64 spans past the warmup block.
fn timed_batch() -> Batch<u64> {
let mut events = Vec::with_capacity(EVENT_COUNT as usize);
let mut spans = Vec::with_capacity(SPAN_COUNT as usize);
let mut batch = Batch::new();
batch.boundary = Some(block_ref(0));
for block in 1..=SPAN_COUNT {
let start = events.len() as u32;
for log_index in 0..EVENTS_PER_SPAN {
events.push(LogEvent {
log_index,
event: log_index,
});
}
let end = events.len() as u32;
spans.push(BlockSpan {
block: block_ref(block),
start,
end,
});
}
Batch {
boundary: Some(block_ref(0)),
spans,
events,
batch.push_block(
block_ref(block),
(0..EVENTS_PER_SPAN).map(|log_index| (log_index, u64::from(log_index))),
);
}
batch
}

fn bench_apply(c: &mut Criterion) {
Expand Down
26 changes: 6 additions & 20 deletions crates/chainfold/benches/snapshot.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -5,10 +5,8 @@ use std::hint::black_box;
use chainfold::{
Batch,
BlockRef,
BlockSpan,
Engine,
EngineConfig,
LogEvent,
test_util::RecordingFold,
};
use criterion::{
Expand All @@ -21,7 +19,7 @@ use criterion::{
/// Observed-block ring window; only one block is ever observed in this benchmark.
const RING_CAPACITY: usize = 8;
/// Recorded-fold entries the envelope carries.
const ENTRY_COUNT: u64 = 4096;
const ENTRY_COUNT: u32 = 4096;

/// Builds a distinguishable header for a block number.
fn block_ref(number: u64) -> BlockRef {
Expand All @@ -38,23 +36,11 @@ fn recorded_engine() -> Engine<RecordingFold> {
};
let mut engine =
Engine::new(RecordingFold::default(), config).expect("engine config is valid");
let mut events = Vec::with_capacity(ENTRY_COUNT as usize);
for log_index in 0..ENTRY_COUNT {
events.push(LogEvent {
log_index,
event: log_index,
});
}
let end = events.len() as u32;
let batch = Batch {
boundary: None,
spans: vec![BlockSpan {
block: block_ref(1),
start: 0,
end,
}],
events,
};
let mut batch = Batch::new();
batch.push_block(
block_ref(1),
(0..ENTRY_COUNT).map(|log_index| (log_index, u64::from(log_index))),
);
engine.apply_batch(&batch).expect("apply_batch succeeds");
engine
}
Expand Down
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