performance guide

Built-In Profiler

To get a summary of latency histograms relating to different operations you've used on a sled database, sled can print a nice table when the Db is dropped by disabling the "no_metrics" default feature and setting print_profile_on_drop(true) on a ConfigBuilder:

let config = sled::ConfigBuilder::new()
    .print_profile_on_drop(true)
    .build();

let db = sled::Db::start(config).unwrap();

This is useful for finding outliers, general percentiles about usage, and especially for debugging performance issues if you create an issue on github.

Use jemalloc

jemalloc can dramatically improve performance in some situations, but you should always measure performance before and after using it, because maybe for some use cases it can cause regressions.

Cargo.toml:

[dependencies]
jemallocator = "0.1"

your_code.rs:

#[global_allocator]
static ALLOC: jemallocator::Jemalloc = jemallocator::Jemalloc;