Open Source Tools

Open source tools from DAGZ for CI observability and build acceleration.

Source: github.com/autodag-dev/opendagz

zb time: Process Tree Profiler

A time(1) replacement that traces the entire process tree with per-process CPU, memory, I/O, and thread metrics.

Useful for understanding complex build systems. You see every spawned process nested by parent/child, aggregated stats per executable, and a summary line like time(1).

zb time make -j16
zb time --output trace.txt pytest --dagz

Example output (CPython build):

├─#935        00:00:23.616      0.365s     0.6%cpu   42 MB   [rc=0] gcc -fPIC ...
│ ├─#936      00:00:23.617      0.342s    98.0%cpu   42 MB   [rc=0] cc1 -quiet ...
│ └─#937      00:00:23.963      0.017s    76.6%cpu    5 MB   [rc=0] as ...

Group by command (most cpu-intensive last):
    0.002s    79.4%cpu     6 MB avg  rm
    2.639s    81.1%cpu    13 MB avg  /usr/bin/ld
  245.634s    97.2%cpu    56 MB avg  cc1

make: 969 commands  30.233s   896.5%cpu   Exited 0

Uses ptrace(2). No LD_PRELOAD, no wrappers injected into the build.

Linux only. macOS in progress.

cargo-zb: Cargo Build Cache

A drop-in cargo wrapper that caches entire build outputs. On cache hit, restores all artifacts via copy_file_range(2). No recompilation, no per-crate overhead.

cargo zb --release

Benchmarks

Project	Files	Size	sccache	cargo-zb	Speedup
ripgrep	335	213 MiB	6.3s	0.17s	37x
reqwest	1257	222 MiB	6.4s	0.23s	28x

Why it's fast

• Whole-build caching. sccache wraps each rustc invocation (process spawn + tokio runtime + daemon RPC per crate). cargo-zb hashes the entire unit graph upfront and does a single cache lookup.
• Zero-copy restore. Uses copy_file_range(2) to write cached files directly from page cache to disk.
• No binary gap. sccache doesn't cache binary crates. cargo-zb caches everything.
• Cargo as a library. No wrapper processes. Resolves the unit graph and computes cache keys in-process.

Linux only.

Install

Download

Latest release

Via Cargo

cargo install opendagz        # zb time
cargo install cargo-zb         # cargo-zb

License

AGPL-3.0. For commercial licensing, contact [email protected].