Malloc perf
What is the worst-case performance for malloc on a modern machine in practice? - Benchmarking Malloc with Doom 3 - ForrestTheWoods
some observations
CRT is quite bad
dlmalloc and tlsf are old and single-threaded
jemalloc, mimalloc, and rpmalloc are “modern allocators”
Modern allocators:
- Are designed for multi-threading
- p50 malloc in under 10 nanoseconds
- p95 malloc in ~25 nanoseconds
- Worst 0.1%: 1 to 50 microseconds
- Absolute Worst: ~500 microseconds
Latency vs Reliability
How much latency is too much? A Reddit discussion contained a rule of thumb I like:
2ms - works for pro audio
20ms - works for gaming
200ms - works for music
2000ms - works for streaming
see also
Written on June 8, 2022, Last update on March 27, 2023
malloc
memory
allocator
c++
fastware
latency