Re: "Checkpointing long" on exit

> -----Original Message-----
> From: Steve Fiddle <[email protected]>
> Sent: Tuesday, March 16, 2021 8:25 AM
> To: Audacity-Devel list <[email protected]>
> Subject: [Audacity-devel] "Checkpointing long" on exit
> 
> Why is this happening?
> 
> Importing large WAV from hdd:
> 1. Launch Audacity
> 2. Drag and drop large WAV file (2.4 GB) from hdd into Audacity.
> Import takes about 45 seconds.
> 3. Exit Audacity
> 3.1. "Save project before closing?" -> No
> 3.2 "Checkpointing long" dialog opens and may take 30 seconds before
> Audacity closes.
> 
> Why is Audacity doing "checkpointing"?  What is it actually doing?
> 
> If I wait a couple of minutes after the file has fully imported before exit,
> Audacity closes immediately. Does this mean that Audacity is actually doing
> part of the import process in the background after the waveform has
> appeared?
> 
> Importing from SSD:
> 1. Launch Audacity
> 2. Drag and drop large WAV file (2.4 GB) from SSD into Audacity.
> Import is MUCH slower (around 1 minute 30) ???
> 3. Exit Audacity
> 3.1. "Save project before closing?" -> No
> 3.2 Audacity closes immediately.
> 
> Why does import from SSD take twice as long as from a much slower hdd?
> 

Checkpointing is done in a separate thread and when a database is closed, all checkpoints must complete before Audacity can continue.  In both of your cases, the checkpointing should be started while the file is still being imported.  But, in your first case, the checkpoints take longer to complete so there's more left to do when the database is closed at Audacity shutdown.  In your SSD test, the checkpoints seem to be finishing during the import and not delayed to database close.

Well, that's my first guess anyway.  A quick review of the code does seem to prove the theory, but reality may vary slightly.  😊





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