heap snapshots stuck "building graph layout..."

[IanButterworth]

If I take a heap snapshot in chrome devtools then open the graph mode in this viewer I just get building graph layout... it seems indefinitely. There's no error printed to the Window output log

The same is true of heap snapshots collected in the julia profiler, but that is more experimental, so chrome devtools is probably a better reproducer.

[IanButterworth]

I notice that main has unreleased changes and wanted to see if the issue remains on latest main.

I tried to test latest master but couldn't figure out testing the extension.
Issues:

• package.json is missing version and engines fields
• vsce package doesn't create a vsix file to load as a local extension

[connor4312]

If you run the Toggle Developer Tools command, is there any errors shown there?

Alternatively/preferably, are you able to share a heap snapshot where you see this reproduce?

[IanButterworth]

I'm not sure what a chrome heapsnapshot includes, from a security perspective. Would you mind confirming that your own chrome devtools heapsnapshots don't reproduce? If so I can look into sharing one from a blank VM or something.

[connor4312]

It includes some stuff about your program structure (by way of the heap structure) as well as strings allocated in the heap. If you prefer you can also email it to me at connor@xbox.com rather than posting publicly.

[IanButterworth]

Ok. Emailed, thanks

[connor4312]

Thanks! This week we're busy getting the next release out, but I'll take a look at this by the end of next week.

[IanButterworth]

Ah vscode dev tools does show an error in the console

[connor4312]

Circling back here, how are you opening the graph?

The graph as implemented currently only is relevant for selected objects from the table. It doesn't handle opening the entire heap snapshot (something I should make more explicit) because doing so for heaps of any reasonable size results in absolutely terrible performance as the graphs get very massive very quickly 🙂

[IanButterworth]

How do you open it for a given object?

[connor4312]

By clicking the "graph" button beside an object in memory:

[IanButterworth]

I just realized that and it works for the julia heap snapshot! 👍

The behavior I was talking about was from opening via the file open dialog (3rd option here)

Perhaps the UI could give a hint to use the icons if the top level load is taking a long time?

[connor4312]

I made a PR to remove the graph view from that switcher #179

[IanButterworth]

Is there a place the graph icon is explained? In hindsight it's obvious but it might be worth explaining it in the extension landing page?

[connor4312]

Good idea, added (in the same PR)

[IanButterworth]

Looks great, thanks