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magus benchmarks

Measured in this run: magus, make, on the go fixture(s). A tool absent from the tables below produced no results here and is not being compared. A row marked FAILED exited non-zero and is not a measurement of the work the scenario describes.

Environment

Date: 2026-09-20T17:21:27Z
Go: go1.26.6-X:jsonv2
Kernel: Darwin Elis-MacBook-Air.local 25.6.0 Darwin Kernel Version 25.6.0: Fri Jul 31 19:16:20 PDT 2026; root:xnu-12377.161.14~5/RELEASE_ARM64_T8142 arm64
CPU: Apple M5
CPU cores: 10
RAM: 25165824 kB
magus commit: 9d6003dc787d93dfe2427472d8df62e3cc53a40e

Tool versions (observed)

hyperfine: hyperfine 1.19.0
magus: magus v0.4.3-48-g9d6003dc7 (9d6003dc7) built 2026-09-20T12:17:26-05:00
make (gmake): GNU Make 4.4.1

Fixture: go (N=50)

S1: Startup overhead (--version)

Tool Daemon min (ms) mean (ms) median (ms) stddev p99 (ms) runs
magus on 0.00 0.40 0.18 0.57 2 50
make off 1 2 2 0.19 2 50
magus off 8 8 8 0.29 9 50

S2: Project discovery

Tool Daemon min (ms) mean (ms) median (ms) stddev p99 (ms) runs
magus off 103 104 104 0.64 105 10

S3: Affected dry-run (1 file changed)

Tool Daemon min (ms) mean (ms) median (ms) stddev p99 (ms) runs
magus on 37 39 39 1 41 10
magus off 88 108 96 43 229 10

S4: Cold build, parallel

Tool Daemon min (ms) mean (ms) median (ms) stddev p99 (ms) runs
make off 1319 1366 1366 27 1398 10
magus on 2807 2852 2841 36 2928 10
magus off 3033 3066 3059 34 3155 10

S5: Warm cache replay

Tool Daemon min (ms) mean (ms) median (ms) stddev p99 (ms) runs
make off 5 5 5 0.24 6 10
magus off 1381 1392 1392 10 1413 10
magus on 1705 1758 1728 69 1914 10

S6: One leaf file changed

Tool Daemon min (ms) mean (ms) median (ms) stddev p99 (ms) runs
make off 106 109 109 2 113 10
magus off 1401 1440 1423 67 1627 10
magus on 1780 1865 1813 104 2082 10
magus documentationThe magus documentation hub covering install, targets, spells, charms, operations, engines, remote caching, MCP, telemetry, and the interactive playground. ChangelogEvery change to magus, newest first, in Keep a Changelog format, starting with the unreleased entries. Generated from changes/unreleased/ and releases/*.yaml. CharmsLearn how magus charms replace one-off tool flags with shared, composable intent modifiers that patch a target's argument vector at run time. ConcurrencyHow magus coordinates parallel work: the intra-process scheduler that parallelizes a single run, the cross-process workspace lock that keeps two separate magus invocations from clobbering each other's outputs and cache, and the broker-held machine budget that keeps every magus on the host from oversubscribing it.
generatedbenchmarks/BENCHMARKS.mdbenchmarksperformancemeasurement
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Glossary

Project

A directory magus recognizes as a unit of work (it has a magusfile); the unit of caching, scheduling, and dependency tracking. Project in full.

Cache

The content-addressed store magus consults before running a target, so unchanged work is skipped. Cache in full.

Affected

The set of projects touched by a change; magus affected <target> runs a target only over them. Affected in full.

Daemon

The background process a person starts with magus server start. It serves MCP, the console, background jobs and the warm knowledge graph, and adopts nested magus calls into one pool. Daemon in full.

Tool

An action a model can call through its host: a name, a description, a typed input and a result. magus serves its tools over MCP, each a read of the workspace model or a run of the CLI it already has. Tool in full.

Run

One target executing under one magus invocation, such as magus run test web or magus affected ci. A run keeps its captured output behind an output reference. Every magus run is a run whether or not any job asked for it; see Job for how the two relate. Run in full.

Lease

The grant a holder takes on a job: the write and read paths that job declared, enforced in the checkout that took it with magus job exec. A job is the piece of work; a lease is permission over it. Lease in full.

Conventions

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