Question 1

How to convert DTrace output to a flame graph using Stackvis?

Accepted Answer

Use the command 'stackvis < dtrace.out > flamegraph.htm' as shown in the Synopsis. This reads DTrace data and outputs an interactive HTML flame graph by default, with options to specify other formats like SVG.

Question 2

Stackvis vs Brendan Gregg's FlameGraph: which is better?

Accepted Answer

Stackvis is a Node.js port with additional features like multiple format support and an extensible API, while the original FlameGraph is Perl-based and more established. Choose Stackvis if you need JavaScript integration or specific input formats, but FlameGraph might be simpler for basic needs.

Question 3

How to filter out specific function names in Stackvis flame graphs?

Accepted Answer

First, use 'stackcollapse' to create a collapsed file, then grep through it to remove unwanted frames, and finally use 'flamegraph' to generate the SVG, as described in the Details section for more verbose processing.

Question 4

Does Stackvis support SystemTap output?

Accepted Answer

Yes, Stackvis can read SystemTap output by specifying the 'stap' input format, e.g., 'stackvis stap flamegraph-d3 < stap.out > graph.htm', as mentioned in the supported input formats.

Question 5

How to integrate Stackvis into a Node.js application?

Accepted Answer

Require the 'stackvis' module and use the API with lookupReader and lookupWriter, as shown in the API example, to pipe stacks between different formats, though it requires setting up a Bunyan logger for logging.

Question 6

Is Stackvis still being updated?

Accepted Answer

The project appears to have limited recent activity, and the TODO section suggests some features are incomplete, so it may not be actively maintained for new developments or modern profiling tools.

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