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rerun-io / rerun

Visualize streams of multimodal data. Fast, easy to use, and simple to integrate. Built in Rust using egui.
https://rerun.io/
Apache License 2.0
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Data ingestion starved when in background #1960

Open emilk opened 1 year ago

emilk commented 1 year ago

We currently ingest the incoming log data into the data store in a requestAnimationFrame callback, which won't get called at all when the web app is in a background tab. The same goes for the garbage collection.

The WebSocket ingestion however is done in a async callback, so log messages will be received and put on a channel that will grow until the user switches tabs again.

This means that if you start a web viewer, move it to a background tab and then keep sending it log events, it will eventually crash because it runs out of memory.

There are a few things we should consider doing here:

Do store ingestion and GC on a separate "task"

e.g. setInterval callback on web, and a background thread on native.

This will likely be a performance boost as well on native.

Apply back-pressure to halt new log messages when we don't ingest them fast enough

This has the downside of added latency though, which is bad for live views.

We have a --drop-at-latency flag that drops incoming log messages if the channel grows over some certain length of time. We may wanna change that to a maximum size in MB and allow the user to chose if this should apply backpressure (we get to see everything, eventually) or drop messages (we get a live view, but it may be lossy).

Related:

jleibs commented 3 months ago

This also applies to native on most OS's since ingestion and gc happen on the main UI thread which runs at a lower rate when the window is in the background.