Project Dependencies

This is a Rust programming language project requiring the Rust toolchain, including the Rust build system and package manager, named cargo.

In addition to the base toolchain, this project also makes use of the following:

Tool	Description	Rationale
uv	An extremely fast Python package and project manager	Solely for benchmarking against the Python implementation
just	A handy way to save and run project-specific commands	Convenience
jq	A handy way to slice and filter JSON output	Convenience tool for JSON and JSONL.
mdbook	A tool to create books with Markdown.	This project is documented via mdbook.

Rust Crate Dependencies

Dependencies are declared in Cargo.toml and managed by cargo.

Crate	Version	Purpose
`nvml-wrapper`	0.12	NVIDIA GPU monitoring via NVML; loaded at runtime with `libloading` – no build-time system deps; returns empty on non-NVIDIA hosts
`clap`	4	CLI argument parsing; stripped to `derive`, `std`, `help`, `usage`, `error-context`, `env` features only
`procfs`	0.18	Linux `/proc` parsing for CPU, memory, disk, and network metrics
`ureq`	3	Lightweight synchronous HTTP client for Sentinel API and S3 PUT; avoids tokio runtime overhead
`serde`	1	Serialization/deserialization framework with `derive` macros
`serde_json`	1	JSON serialization for metric output and API payloads
`toml`	1.0	TOML config file parsing; `parse` + `serde` features only, no `display` overhead
`hmac`	0.13.0-rc.6	HMAC-SHA256 for manual AWS Signature Version 4 signing of S3 PUT requests
`sha2`	0.11.0	SHA-256 hashing required by AWS Sig V4; paired with `hmac`
`hex`	0.4	Hex encoding of HMAC digests for Sig V4 canonical request construction
`libc`	0.2	FFI bindings for `statvfs` (filesystem space), `gethostname`, and `SIGTERM` signal handling
`flate2`	1.1.9 (pinned)	Gzip compression for `.csv.gz` S3 batch uploads; `rust_backend` feature uses pure Rust (no `zlib-sys` C dep)
`libamdgpu_top`	0.11.2	AMD GPU monitoring via `libdrm`; `libdrm_dynamic_loading` feature loads the library at runtime – gracefully skipped on non-AMD hosts

Crate	Version	Purpose
`num_cpus`	1	Smoke tests: verifies `cpu.utilization_pct` is expressed as fractional cores (bounded by logical CPU count), not a percentage