shared-core

This repo contains bitdrift code shared between the client and server.

Development

Tests are run with cargo test. If you run into file descriptor exhaustion, consider increasing the ulimit size or target specific crates. Alternatively, consider using nextest which seems less prone to exhaustion:

cargo install cargo-nextest --locked
cargo nextest run # Accepts cargo test arguments

Requirements

brew install protobuf flatbuffers

Benchmarking

To run benchmarks, use the following command:

cargo bench

This should run all benchmarks (both criterion and iai) and output the results. Use the --bench command to run a specific benchmark or -p to run a specific package.

Flamegraphs

To generate flamegraphs for a criterion test, use the following command

cargo flamegraph --bench {benchmark} -- --bench

cargo flamegraph can be installed using the following command:

cargo install flamegraph

This will generate a flamegraph in current directory. To view the flamegraph, use the following command:

open flamegraph.svg

Note that the flamegraph generated under macOS may not be accurate. To generate a more accurate flamegraph, build and run the benchmark under Linux. Using orb or a similar tool to get a Linux VM is recommended.

To run under orb, use the following command:

SKIP_PROTO_GEN=1 PATH=/usr/lib/linux-tools/*-generic:$PATH cargo bench --bench {benchmark} -- --bench

• SKIP_PROTO_GEN=1 skips the protobuf generation step, which is not necessary for benchmarking and avoids having to install the protobuf compiler on the VM.
• PATH=/usr/lib/linux-tools/6.5.0-35-generic:$PATH adds the Linux perf tools to the path. The default perf on Ubuntu tries to find the distribution-specific version of perf, which doesn't exist under orb. Putting the path to the perf tools in front of the path allows the perf tools to be found instead of the Ubuntu-specific wrapper script. Note that the version in the path must match whichever linux-tools package is installed on the VM.

Coverage

To generate a coverage report, use the following command:

SKIP_PROTO_GEN=1 cargo tarpaulin --engine llvm -o html

This should output a coverage report ./tarpaulin-report.html in the current directory.

cargo tarpaulin can be installed using the following command:

cargo install cargo-tarpaulin

Alternatively you can invoke tarpaulin via Docker as explained in the tarpaulin documentation