Panic with message "No space left on device"

[sashahilton00]

Issue by joerg-krause
Friday Mar 17, 2017 at 09:51 GMT
Originally opened as plietar/librespot#166

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When playling long tracks on my embedded device with about 36MB of free RAM, librespot panics with: thread 'main' panicked at 'called Result::unwrap()on anErr value: Error { repr: Os { code: 28, message: "No space left on device" } }'.

For example using this track (45:31). Is there a way not to load the whole song into RAM?

[sashahilton00]

Comment by plietar
Friday Mar 17, 2017 at 14:37 GMT

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Interesting, I never really considered very large tracks.
librespot doesn't load the whole song into RAM, but it downloads it into /tmp, which may be the same thing if that is mounted as a tmpfs.

As a temporary workaround, you can change this line from NamedTempFile::new() to NamedTempFile::new_in("/somewhere/not/in/ram").

Ideally, if a cache directory is specified we can just use $CACHE/temp automatically for that.

[sashahilton00]

Comment by joerg-krause
Friday Mar 17, 2017 at 17:52 GMT

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Thanks, I will try this. In fact, this track is an extreme. It my also happen for tracks having a length of six or seven minutes, depending on the free RAM left.

[sashahilton00]

Comment by joerg-krause
Thursday Mar 23, 2017 at 12:10 GMT

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On second thought, my system is NAND flash based. So, using anything else than the RAM for caching is not a good idea. So, I need a bigger RAM?

[sashahilton00]

Comment by plietar
Thursday Mar 23, 2017 at 13:25 GMT

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Pretty much. A solution would be to change librespot to break up the files in blocks of say 500KB, and delete them automatically (if cache is disabled) once it has moved on to the next one. This is a large-ish change, so it's unlikely I'll be able to implement it anytime soon unfortunately.

[sashahilton00]

Comment by michaelherger
Tuesday May 02, 2017 at 04:33 GMT

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I've modified librespot to disable the audio file-cache. See pull request #181.

[ComlOnline]

The final PR for this was closed. See here.

[plietar]

This is different from plietar/librespot#204. The issue here is that librespot tries to download the entire file (whether or not cache is enabled), which may be impossible for long tracks and low memory devices.

[michaelherger]

Yep, I had to learn this the hard way: though I had the audio-cache disabled I still saw people with large files in TMPDIR. In my case I was able to work around this using the method mentioned by @plietar: have librespot write to some place outside in-memory storage. Setting TMPDIR=/path/to/folder librespot ... does the trick here.

[sashahilton00]

given that all spotify songs are downloaded in chunks, is there an easy way to discard chunks once they have been played when the cache is disabled?