feat: make dashboard hardware- and host-agnostic

.env.example

@@ -1,27 +1,30 @@
 # Copy this file to `.env` and edit with your own values.
 # The dev/ scripts source this file; Vite auto-loads VITE_* variables.
 
-# --- Connection to the DGX Spark running the backend --------------------------
-# SSH user on the Spark. Must have key-based auth configured (no passwords).
-SPARK_USER=your-user
+# --- Connection to the remote Linux host running the backend -----------------
+# SSH user on the remote host. Must have key-based auth configured (no passwords).
+DEPLOY_USER=your-user
 
-# Hostname or IP address of the Spark.
-SPARK_HOST=192.168.1.100
+# Hostname or IP address of the remote host.
+DEPLOY_HOST=192.168.1.100
 
-# Path on the Spark where the project is synced.
+# Path on the remote host where the project is synced.
 # Relative paths (no leading slash) are resolved against the remote user's
 # home directory. Use an absolute path like /opt/spark-dashboard if you want
 # to sync somewhere else.
 # Do NOT use a leading `~/` — that would be expanded to your *local* home.
-SPARK_DIR=spark-dashboard
+DEPLOY_DIR=spark-dashboard
+
+# Legacy aliases: SPARK_USER / SPARK_HOST / SPARK_DIR still work as a fallback
+# if DEPLOY_* are unset. You'll see a one-line deprecation note at dev.sh startup.
 
 # --- Frontend (Vite dev server) ----------------------------------------------
 # Where the Vite dev server proxies `/ws` and `/api` calls.
 #
 # Default `http://localhost:3000` works when you use an SSH tunnel that maps
-# the Spark's port 3000 to your local machine (e.g. NVIDIA Sync port
-# forwarding or `ssh -L 3000:localhost:3000 ...`).
+# the remote host's port 3000 to your local machine
+# (e.g. `ssh -L 3000:localhost:3000 ...`).
 #
 # To connect directly over the network, set this to:
-#   VITE_BACKEND_URL=http://${SPARK_HOST}:3000
+#   VITE_BACKEND_URL=http://${DEPLOY_HOST}:3000
 VITE_BACKEND_URL=http://localhost:3000

CONTRIBUTING.md

@@ -8,7 +8,7 @@ bug reports, clear reproductions, and targeted PRs are all welcome.
 ```bash
 git clone https://github.com/niklasfrick/spark-dashboard.git
 cd spark-dashboard
-cp .env.example .env           # edit with your Spark's user/host
+cp .env.example .env           # edit with your remote host's user/host
 ./dev/dev.sh
 ```
 
@@ -21,7 +21,7 @@ environment variables are required.
 # Frontend (runs on any OS)
 cd frontend && npm test
 
-# Backend (must run on Linux / the DGX Spark — depends on NVML, procfs)
+# Backend (must run on Linux with NVIDIA drivers — depends on NVML, procfs)
 cargo test
 ```
 
@@ -75,6 +75,6 @@ Do **not** hand-edit version numbers — `release-please` owns them.
 When filing a bug, please include:
 
 - What you expected vs. what happened
-- DGX Spark OS / driver / CUDA versions (`nvidia-smi`)
+- Host OS / NVIDIA driver / CUDA versions (`nvidia-smi`)
 - Which engine adapter was involved (vLLM, etc.), if any
 - A snippet from `/tmp/spark-dashboard.log` around the failure

Cargo.toml

@@ -2,7 +2,7 @@
 name = "spark-dashboard"
 version = "0.2.0"
 edition = "2021"
-description = "Real-time hardware and LLM inference monitoring for the NVIDIA DGX Spark"
+description = "Real-time hardware and LLM inference monitoring for Linux hosts with NVIDIA GPUs"
 license = "MIT"
 repository = "https://github.com/niklasfrick/spark-dashboard"
 readme = "README.md"

README.md

@@ -1,7 +1,9 @@
 # Spark Dashboard
 
-Real-time hardware and LLM inference monitoring for the NVIDIA DGX Spark. A
-Rust backend collects GPU, CPU, memory, disk, and network metrics alongside
+Real-time hardware and LLM inference monitoring for Linux systems with NVIDIA
+GPUs. Developed and tested on the NVIDIA DGX Spark, but works on any Linux
+host with NVIDIA drivers — discrete-GPU workstations, DGX boxes, cloud VMs.
+A Rust backend collects GPU, CPU, memory, disk, and network metrics alongside
 vLLM engine statistics and streams them over WebSocket to a React frontend.
 
 ![Stack](https://img.shields.io/badge/Rust-Axum-orange) ![Stack](https://img.shields.io/badge/React_19-TypeScript-blue) ![Stack](https://img.shields.io/badge/Tailwind_CSS_4-06B6D4) ![Stack](https://img.shields.io/badge/Vite_8-646CFF) ![License](https://img.shields.io/badge/license-MIT-green)
@@ -10,25 +12,25 @@ vLLM engine statistics and streams them over WebSocket to a React frontend.
 
 ## Quick Start
 
-### Install on the Spark
+### Install on your Linux host
 
-Run as your normal user on the DGX Spark (requires Rust 1.75+):
+Run as your normal user on any Linux host with NVIDIA drivers (requires Rust 1.75+):
 
 ```bash
 cargo install spark-dashboard
 sudo spark-dashboard service install
 systemctl status spark-dashboard
 ```
 
-The dashboard is now served on port 3000. See [Install on the DGX Spark](#install-on-the-dgx-spark)
+The dashboard is now served on port 3000. See [Install on your Linux host](#install-on-your-linux-host-1)
 for the full guide, config overrides, and uninstall.
 
 ### Develop locally
 
 ```bash
 git clone https://github.com/niklasfrick/spark-dashboard.git
 cd spark-dashboard
-cp .env.example .env           # edit with your Spark's user/host
+cp .env.example .env           # edit with your remote host's user/host
 ./dev/dev.sh
 ```
 
@@ -41,7 +43,9 @@ for details on what each script does.
 - GPU utilization, temperature, power draw, clock frequencies, fan speed
 - GPU event detection — thermal throttling, hardware slowdown, power brake
 - CPU aggregate and per-core utilization with heatmap
-- Unified memory breakdown (GPU / CPU / cached / free)
+- Memory breakdown — CPU RAM and GPU VRAM separately on discrete-GPU hosts,
+  or a single unified pool on systems where CPU and GPU share memory
+  (e.g. DGX Spark GB10, GH200)
 - Disk and network I/O throughput
 
 **LLM Engine Monitoring** (vLLM via Prometheus metrics)
@@ -71,7 +75,7 @@ for details on what each script does.
 │                      │  Static files (rust-embed)       │  Recharts, Tailwind│
 │  Axum router         │ ◀──── production only ─────────  │  shadcn/ui         │
 └──────────────────────┘                                  └────────────────────┘
-       DGX Spark                                              Browser
+  Linux host (e.g. DGX Spark)                                  Browser
 ```
 
 Two independent Tokio tasks run in parallel — one for hardware metrics (NVML,
@@ -92,23 +96,25 @@ cp .env.example .env
 
 | Variable           | Purpose                                                      |
 |--------------------|--------------------------------------------------------------|
-| `SPARK_USER`       | SSH user on the Spark (required)                             |
-| `SPARK_HOST`       | Hostname or IP of the Spark (required)                       |
-| `SPARK_DIR`        | Project path on the Spark, relative to remote home (default `spark-dashboard`) |
+| `DEPLOY_USER`      | SSH user on the remote host (required)                       |
+| `DEPLOY_HOST`      | Hostname or IP of the remote host (required)                 |
+| `DEPLOY_DIR`       | Project path on the remote host, relative to remote home (default `spark-dashboard`) |
 | `VITE_BACKEND_URL` | Where Vite proxies `/ws` and `/api` (default `http://localhost:3000`) |
 
-The scripts in `dev/` source this file; Vite picks up `VITE_*` variables
+Legacy `SPARK_USER` / `SPARK_HOST` / `SPARK_DIR` are still accepted as a
+fallback when `DEPLOY_*` are unset — `dev.sh` prints a one-line deprecation
+note. The scripts in `dev/` source this file; Vite picks up `VITE_*` variables
 automatically. `.env` is gitignored — never commit it.
 
-## Install on the DGX Spark
+## Install on your Linux host
 
-The dashboard runs as a supervised `systemd` service on the Spark. Two install
-paths; both build from source on the Spark.
+The dashboard runs as a supervised `systemd` service. Two install paths; both
+build from source on the host.
 
 ### Option A — via cargo (recommended)
 
 ```bash
-# On the Spark. Requires Rust 1.75+ and internet access.
+# On the host. Requires Rust 1.75+, NVIDIA drivers, and internet access.
 cargo install spark-dashboard
 sudo spark-dashboard service install
 systemctl status spark-dashboard
@@ -126,7 +132,7 @@ Use this when you want to install without crates.io (audit the source,
 air-gapped install, or deploy an unreleased commit).
 
 ```bash
-# On the Spark. Run as your normal user — the script escalates to sudo
+# On the host. Run as your normal user — the script escalates to sudo
 # only for the systemd wiring step.
 git clone https://github.com/niklasfrick/spark-dashboard.git
 cd spark-dashboard
@@ -148,7 +154,8 @@ sudo spark-dashboard service status       # same as `systemctl status`
 
 Optional overrides live in `/etc/spark-dashboard/config.env` — set
 `SPARK_DASHBOARD_PORT`, `SPARK_DASHBOARD_BIND`, `SPARK_DASHBOARD_POLL_INTERVAL`,
-or `RUST_LOG`, then `sudo systemctl restart spark-dashboard`.
+`SPARK_DASHBOARD_GPU_INDEX`, or `RUST_LOG`, then
+`sudo systemctl restart spark-dashboard`.
 
 ### Upgrade
 
@@ -181,19 +188,21 @@ spark-dashboard service status
   -p, --port <PORT>           Listen port [default: 3000] [env: SPARK_DASHBOARD_PORT]
   -b, --bind <BIND>           Bind address [default: 0.0.0.0] [env: SPARK_DASHBOARD_BIND]
       --poll-interval <MS>    Polling interval ms [default: 1000] [env: SPARK_DASHBOARD_POLL_INTERVAL]
+      --gpu-index <IDX>       NVML GPU index to monitor [default: 0] [env: SPARK_DASHBOARD_GPU_INDEX]
       --engine <TYPE>         Manual engine type (e.g. vllm)
       --engine-url <URL>      Manual engine endpoint (requires --engine)
 ```
 
-Engines are auto-detected via process scan and Docker API. Use `--engine` and
-`--engine-url` to override when auto-detection doesn't work.
+On multi-GPU hosts use `--gpu-index` to select which device the dashboard
+monitors. Engines are auto-detected via process scan and Docker API. Use
+`--engine` and `--engine-url` to override when auto-detection doesn't work.
 
 ## Development
 
 ### Prerequisites
 
 - **Local machine** (macOS or Linux): Node.js 20+, npm, rsync, ssh
-- **DGX Spark**: Rust 1.75+, SSH access with key-based auth (no password prompts)
+- **Remote host**: Linux + NVIDIA drivers, Rust 1.75+, SSH access with key-based auth (no password prompts)
 - Optional: `brew install fswatch` for instant file-change detection (the
   watcher falls back to 2s polling without it)
 
@@ -205,41 +214,41 @@ Engines are auto-detected via process scan and Docker API. Use `--engine` and
 
 The script handles everything:
 
-1. **Syncs** the full project to the Spark via rsync
-2. **Builds** the Rust backend on the Spark (`cargo build --release`)
-3. **Starts** the backend on the Spark (port 3000)
+1. **Syncs** the full project to the remote host via rsync
+2. **Builds** the Rust backend on the remote host (`cargo build --release`)
+3. **Starts** the backend on the remote host (port 3000)
 4. **Starts** the Vite dev server locally (port 5173)
-5. **Watches** `src/` and `Cargo.toml` for Rust changes — auto-syncs and rebuilds on the Spark
+5. **Watches** `src/` and `Cargo.toml` for Rust changes — auto-syncs and rebuilds on the remote host
 
 | What you edit                      | What happens                                                      |
 |------------------------------------|-------------------------------------------------------------------|
 | Frontend files (`frontend/src/`)   | Vite hot-reloads instantly in the browser                         |
-| Backend files (`src/`, `Cargo.toml`) | Auto-detected → rsync to Spark → rebuild → restart (~compile time) |
+| Backend files (`src/`, `Cargo.toml`) | Auto-detected → rsync to remote host → rebuild → restart (~compile time) |
 
 Useful while `dev.sh` is running:
 
 ```bash
 # Watch backend logs in another terminal
-ssh "${SPARK_USER}@${SPARK_HOST}" tail -f /tmp/spark-dashboard.log
+ssh "${DEPLOY_USER}@${DEPLOY_HOST}" tail -f /tmp/spark-dashboard.log
 
 # Press Ctrl+C in the dev.sh terminal to stop everything (cleans up the remote process too)
 ```
 
 ### How the proxy works
 
 By default, Vite proxies `/ws` and `/api` to `localhost:3000` — this works out
-of the box with NVIDIA Sync port forwarding (or any SSH tunnel that maps
-the Spark's port 3000 to your local machine).
+of the box with any SSH tunnel that maps the remote host's port 3000 to your
+local machine.
 
 ```
-Browser → localhost:5173/ws  → Vite proxy → localhost:3000/ws (forwarded to Spark)
-Browser → localhost:5173/api → Vite proxy → localhost:3000/api (forwarded to Spark)
+Browser → localhost:5173/ws  → Vite proxy → localhost:3000/ws (forwarded to remote)
+Browser → localhost:5173/api → Vite proxy → localhost:3000/api (forwarded to remote)
 ```
 
 To connect directly over the network instead, set in `.env`:
 
 ```bash
-VITE_BACKEND_URL=http://${SPARK_HOST}:3000
+VITE_BACKEND_URL=http://${DEPLOY_HOST}:3000
 ```
 
 The frontend connects to the WebSocket using `window.location.host`, so the
@@ -258,7 +267,7 @@ the latest stable version; see [CHANGELOG.md](./CHANGELOG.md) for release notes.
 # Frontend
 cd frontend && npm test
 
-# Backend (on Linux / DGX Spark)
+# Backend (on Linux)
 cargo test
 ```
 
@@ -276,7 +285,7 @@ real NVML/procfs parsing on Linux, with compile-time stubs on other platforms.
 │   │   ├── mod.rs              MetricsSnapshot, collector loop
 │   │   ├── gpu.rs              NVML GPU metrics + event detection
 │   │   ├── cpu.rs              CPU aggregate + per-core
-│   │   ├── memory.rs           Unified memory via /proc/meminfo
+│   │   ├── memory.rs           System RAM + GPU VRAM + unified-memory detection
 │   │   ├── disk.rs             Disk I/O rates
 │   │   └── network.rs          Network I/O rates
 │   └── engines/
@@ -296,7 +305,6 @@ real NVML/procfs parsing on Linux, with compile-time stubs on other platforms.
 │       └── lib/                Circular buffer, formatting, theme
 ├── dev/
 │   ├── dev.sh                  Dev loop (local frontend + remote backend)
-│   ├── deploy.sh               Production deploy to Spark
 │   └── README.md               Operator docs
 ├── .env.example                Configuration template
 ├── LICENSE                     MIT

dev/README.md

@@ -4,39 +4,43 @@ Development-only scripts for spark-dashboard. Configuration is read from a
 repo-root `.env` file — copy `.env.example` to `.env` and edit before running.
 
 For **production installs**, use `cargo install spark-dashboard` or
-`packaging/install.sh`. See the repo [README](../README.md#install-on-the-dgx-spark).
+`packaging/install.sh`. See the repo [README](../README.md#install-on-your-linux-host).
 
 ## Scripts
 
 ### `./dev/dev.sh` — development loop
 
 Runs the full dev environment:
 
-1. rsyncs the project to `${SPARK_USER}@${SPARK_HOST}:${SPARK_DIR}`
-2. builds and starts the Rust backend on the Spark (`cargo build --release`)
+1. rsyncs the project to `${DEPLOY_USER}@${DEPLOY_HOST}:${DEPLOY_DIR}`
+2. builds and starts the Rust backend on the remote host (`cargo build --release`)
 3. starts the Vite dev server locally on port 5173 with a proxy to the backend
 4. streams remote backend logs from `/tmp/spark-dashboard.log`
 5. watches `src/` and `Cargo.toml` — on change, re-syncs and rebuilds the backend
 
 Frontend edits hot-reload in the browser via Vite. Backend edits trigger a
 remote rebuild (takes about as long as `cargo build --release` does on your
-Spark).
+remote host).
 
 ## Required environment variables
 
 | Variable           | Purpose                                                      |
 |--------------------|--------------------------------------------------------------|
-| `SPARK_USER`       | SSH user on the Spark (required)                             |
-| `SPARK_HOST`       | Hostname or IP of the Spark (required)                       |
-| `SPARK_DIR`        | Project path on the Spark, relative to remote home (default `spark-dashboard`) |
+| `DEPLOY_USER`      | SSH user on the remote host (required)                       |
+| `DEPLOY_HOST`      | Hostname or IP of the remote host (required)                 |
+| `DEPLOY_DIR`       | Project path on the remote host, relative to remote home (default `spark-dashboard`) |
 | `VITE_BACKEND_URL` | Where Vite proxies `/ws` and `/api` (default `http://localhost:3000`) |
 
-Missing `SPARK_USER` or `SPARK_HOST` causes the script to exit immediately with
-a clear message.
+Missing `DEPLOY_USER` or `DEPLOY_HOST` causes the script to exit immediately
+with a clear message.
+
+Legacy `SPARK_USER` / `SPARK_HOST` / `SPARK_DIR` are still accepted as a
+fallback when `DEPLOY_*` are unset; you'll see a one-line deprecation note on
+startup.
 
 ## Prerequisites
 
 - **Local machine**: Node.js 20+, npm, rsync, ssh
-- **DGX Spark**: Rust 1.75+ in `~/.cargo/env`, reachable over SSH
+- **Remote host**: Linux with NVIDIA drivers, Rust 1.75+ in `~/.cargo/env`, reachable over SSH
 - **SSH key auth** configured — the scripts make many non-interactive SSH calls and will block on password prompts
 - Optional: `brew install fswatch` for instant change detection (otherwise the watcher polls every 2s)