Speed up eframe state storage
#3353
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When exiting my application, it would freeze for around a minute waiting to finish writing ca. 40MB to file storage. Some quick profiling revealed that it was spending all that time in `File::write`, presumably making a large number of system calls writing tiny amounts of data at a time. We can avoid this by buffering writes using a `BufWriter`, just like we already do with `BufReader`. With this change, my application takes around 1-2 seconds to exit, with the majority of that time spent serializing `ron`. I'm sure there are further potential performance improvements there, but this is already an order of magnitude or two better. I also fixed the call to `log::warn!`, which was using incorrect formatting syntax and not including the error message.
emilk
changed the title
File in BufWriter
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When exiting my application, it would freeze for around a minute waiting to finish writing ca. 40MB to file storage. Some quick profiling revealed that it was spending all that time in
File::write, presumably making a large number of system calls writing tiny amounts of data at a time. We can avoid this by buffering writes using aBufWriter, just like we already do withBufReader.With this change, my application takes around 1-2 seconds to exit, with the majority of that time spent serializing
ron. I'm sure there are further potential performance improvements there, but this is already an order of magnitude or two better.I also fixed the call to
log::warn!, which was using incorrect formatting syntax and not including the error message.I've run
scripts/check.sh, all checks passed.Closes https://github.com/emilk/egui/issues/THE_RELEVANT_ISSUE.I didn't raise an issue first, since this is such a small change. Let me know if you want me to create one.