parallel downloads of multiple debuginfo files

[Milian Wolff <mail@milianw.de>]

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Hey all,

one more debuginfod question: Would it be possible to extend the API to allow 
downloading of multiple debug info files in parallel?

The `debuginfod_find_*` API currently only supports looking at multiple server 
urls in parallel. I would like to ask multiple files in parallel.

The use case would be profiling tools like the ones I'm working on 
(perfparser, heaptrack, ...). There, you usually have a list of libraries that 
you know you'll hit sooner or later. Thus it would be more efficient to start 
downloading all debug information files in parallel directly. At least 
compared to the current status quo with dwfl where we would iteratively find 
individual debug information files, each time blocking the process.

Parallel downloads from a single server would definitely increase the load 
there though, when done naively. Have you thought about adding support for 
something like HTTP/3's ability to download mutiple assets over a single 
connection (maybe even in parallel)?

Thanks
-- 
Milian Wolff
mail@milianw.de
http://milianw.de

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