Whole-machine change & performance diff for Linux, built on PCP.
A single static Go binary. Point it at two moments in time and it tells you what's different — not a wall of dashboards, a diagnosis.
The Diagnose tab runs all four engines against the last hour versus the same hour yesterday, correlates them, and answers in one sentence:
🔴 CPU is degraded: user CPU +2733% Responsible —
mysqldat 310% of a core (+7650%) Changed —kernel.sched_migration_cost_ns500000 → 5000000 Next —mpstat -P ALL 1 5·pidstat 1 5
Which resource, which process, what changed, what to run — full detail from each engine folds out underneath.
- Regression diff — 146 performance metrics between two windows, turned into plain-language conclusions. A dual-significance floor (relative % and an absolute minimum) keeps a quiet machine from lighting up on noise.
- Change accounting (
statediff/verify) — snapshots ~1700 machine facts (sysctl, packages, modules, ports, firewall, services, config fingerprints) and diffs two points in time.verifyis a release gate. - Process accounting — per-process CPU/memory with restart detection,
read straight from
/proc. - Reasoning chain — 78 named states, then 58 diagnoses over combinations of them including negation: what is deliberately absent separates hypervisor contention from an ordinary busy guest. Thresholds scale with the machine, and peaks are read alongside means.
A triage dashboard organizes it as CPU / memory / disk / network, plus a fifth "software gremlin" block for process and config changes.
deltascope reads PCP archives, so the host needs PCP logging.
# Debian / Ubuntu
sudo apt install -y pcp pcp-system-tools
# RHEL / Rocky / Alma / CentOS Stream / Fedora
sudo dnf install -y pcp pcp-system-tools # older: yum install
# openSUSE / SLES
sudo zypper install -y pcp pcp-system-tools
# Arch
sudo pacman -S pcp
sudo systemctl enable --now pmcd pmlogger # all distrosdeploy.sh does this plus a tuned sampling config, a systemd service, and
a locked-down user — recommended for a real deployment.
curl -L -o deltascope https://github.com/githubflyideas/deltascope/raw/main/dist/deltascope-linux-amd64
chmod +x deltascope && sudo mv deltascope /usr/local/bin/ARM64 is in dist/. Verify with sha256sum -c dist/SHA256SUMS.
deltascope serve -listen 0.0.0.0:8080 -data /var/lib/deltascopeOpen it in a browser; the login page creates the admin account on first visit. State is snapshotted every 10 minutes, so history accumulates with no cron job. The UI ships in ten languages and six themes, and any report exports as JSON.
Everything the UI does is available headless, exiting non-zero on a finding so it drops into cron or CI:
deltascope compare -a-start ... -b-start ... # metric regression, exit 2
deltascope statediff -since 24h # config changes, exit 3
deltascope proc-diff -since 24h # per-process CPU/mem, exit 3
deltascope verify start -name deploy-42 # baseline, deploy, then:
deltascope verify report -name deploy-42 -format md
deltascope catalog export > catalog.json # tune, load with -catalog
deltascope rules export > rules.json # tune, load with -rules- Offline-first — no telemetry, archives read locally.
- Single static binary, amd64/arm64, no runtime dependencies.
- No invented numbers — where a percentage would divide by an idle baseline, absolute values are shown instead; weaker-basis figures are labelled, not presented as measured.
- A number and its scale travel together — one saturated core is 1000 ms/s on any host, so each condition picks its own threshold form.
- Customizable — metric catalog and diagnosis rules are external JSON;
profiles/ships full and slim presets.
Apache 2.0