Always validate performance optimizations with benchmarks before implementation. Ensure measurements account for: 1. Platform-specific characteristics (32-bit vs 64-bit)
Always validate performance optimizations with benchmarks before implementation. Ensure measurements account for:
Example:
#[bench]
fn write_64bit_hex(bh: &mut Bencher) {
// Test common cases first
bh.iter(|| {
write!(black_box(discard), "{:x}", black_box(0_u64)).unwrap();
write!(black_box(discard), "{:x}", black_box(10000_i64)).unwrap();
// Test edge cases
write!(black_box(discard), "{:x}", black_box(-10000_i64)).unwrap();
});
}
Avoid premature optimization based on theoretical gains. For instance, reusing buffers might seem beneficial but benchmarks often show stack allocation is equally efficient:
// Prefer simple, clear code unless benchmarks show meaningful gains
let mut buf = NumBuffer::new(); // Creates temporary buffer on stack
format!("{}", number) // Let compiler optimize common case
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