System Performance#

This article describes how ViPPET collects and reports host-level system telemetry — CPU, memory, GPU and NPU utilization — independently of any particular pipeline run.

While Pipeline Performance covers per-job metrics (FPS, latency) produced by the GStreamer pipeline itself, system performance reflects the state of the machine on which ViPPET is running. It is collected continuously, regardless of whether any job is active.

Components#

Component

Role

telegraf (embedded in metrics-manager)

Collects host metrics: CPU usage, memory, CPU frequency, plus GPU/NPU metrics via custom collectors.

metrics-manager

Scrapes the Telegraf Prometheus endpoint, normalizes samples, retains a short rolling window and re-publishes them to UI clients over SSE.

vippet-ui

Subscribes to the SSE stream and renders the dashboard charts.

The Telegraf configuration shipped with ViPPET lives in vippet-telegraf.conf and is mounted read-only into the metrics-manager container.

Data flow#

Host (CPU / Memory / GPU / NPU)
   │
   ▼
telegraf  (inputs: cpu, mem, exec/execd for GPU & NPU via custom collectors)
   │  Prometheus endpoint :9273
   ▼
metrics-manager  (scrape + rolling window, retention 300 s)
   │  SSE  /metrics/stream    (port 9090)
   ▼
nginx (vippet-ui)  → proxies /metrics/stream to metrics-manager
   │
   ▼
Browser (EventSource) → Redux store → System dashboard charts

  1. Telegraf samples the host every second (interval = "1s") and exposes the readings as Prometheus metrics on port 9273.

  2. metrics-manager scrapes that endpoint, keeps a 300-second rolling window in memory and pushes new samples to every connected SSE client on /metrics/stream (port 9090).

  3. vippet-ui opens a single EventSource connection (proxied by nginx) and dispatches incoming samples into the Redux store, which feeds the system-performance charts on the dashboard.

System metrics are emitted independently of pipeline runs, so the dashboard shows host utilization even when no job is active and continues recording during the entire session.

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