pub struct Config {
    pub download_concurrency_limit: usize,
    pub checkpoint_verify_concurrency_limit: usize,
    pub full_verify_concurrency_limit: usize,
    pub parallel_cpu_threads: usize,
}
Expand description

Sync configuration section.

Fields

download_concurrency_limit: usize

The number of parallel block download requests.

This is set to a low value by default, to avoid task and network contention. Increasing this value may improve performance on machines with a fast network connection.

checkpoint_verify_concurrency_limit: usize

The number of blocks submitted in parallel to the checkpoint verifier.

Increasing this limit increases the buffer size, so it reduces the impact of an individual block request failing. However, it also increases memory and CPU usage if block validation stalls, or there are some large blocks in the pipeline.

The block size limit is 2MB, so in theory, this could represent multiple gigabytes of data, if we downloaded arbitrary blocks. However, because we randomly load balance outbound requests, and separate block download from obtaining block hashes, an adversary would have to control a significant fraction of our peers to lead us astray.

For reliable checkpoint syncing, Zebra enforces a MIN_CHECKPOINT_CONCURRENCY_LIMIT.

This is set to a high value by default, to avoid verification pipeline stalls. Decreasing this value reduces RAM usage.

full_verify_concurrency_limit: usize

The number of blocks submitted in parallel to the full verifier.

This is set to a low value by default, to avoid verification timeouts on large blocks. Increasing this value may improve performance on machines with many cores.

parallel_cpu_threads: usize

The number of threads used to verify signatures, proofs, and other CPU-intensive code.

Set to 0 by default, which uses one thread per available CPU core. For details, see the rayon documentation.

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