Feature-gated allocation counter + alloc-budget test#79
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joaquinbejar merged 1 commit intomainfrom Apr 25, 2026
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Wraps any inner GlobalAlloc and tracks four AtomicU64 counters
(allocs / deallocs / bytes_allocated / bytes_deallocated). Bench /
test binaries opt in via:
use orderbook_rs::CountingAllocator;
use std::alloc::System;
#[global_allocator]
static A: CountingAllocator<System> = CountingAllocator::new(System);
The library rlib does not install a global allocator. The wrapper
exists so bench / budget-test binaries can measure hot-path
allocation without forcing a global choice.
New bench at benches/order_book/alloc_count.rs reports allocs_per_op
+ bytes_alloc/op for the mixed 70/20/10 workload (200k warmup +
1M measured) and writes a markdown summary to
target/alloc-counters/. New integration test at
tests/alloc_budget.rs (its own [[test]] binary, gated on
alloc-counters) asserts allocs/op < 10 over 10 000 mixed ops as a
CI regression guard.
mod utils is now pub mod utils so the new types are reachable via
the canonical orderbook_rs::utils path. counting_allocator carries a
documented #[allow(unsafe_code)] exception confined to the
GlobalAlloc trait boundary.
BENCH.md gains an Allocation profile section. CHANGELOG and lib.rs
updated.
Closes #58.
8 tasks
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Closes #58. Adds CountingAllocator + AllocSnapshot behind alloc-counters feature, alloc_count bench reporting allocs_per_op + bytes_alloc/op, and tests/alloc_budget.rs asserting allocs/op < 10 over 10k mixed ops. Library rlib does not install a global allocator. mod utils is now pub. BENCH.md gains Allocation profile section.