Commits on Oct 9, 2024

1. sdcv: Don't walk into "res/" subdirectories …

   When searching for .ifo files use the same optimization as we do in the
   koreader frontend in getIfosInDir(path) in readerdictionary.lua.
   
   Fortunately sdcv uses the for_each_file function exclusively to search
   for .ifo files, making the patch trivial.
   
   I have several dictionaries on my Kobo Aura One, some of which contain
   'res' subdirectories with many files. After a restart or cold boot, the
   first dictionary lookup would take around 45s, while subsequent lookups
   would only take merely around 0.5s. My theory for this massive
   difference is that after reboot, the file system cache is empty, and
   therefore the file system structure for all the resource directories
   must first be loaded from the flash, which seems to be quite slow.
   
   With the patched sdcv there is now no difference between the first and
   the following lookups anymore. In addition, the average lookup time on
   my device drops from 0.5s to about 0.3s.

   

   georgeto committed Oct 9, 2024
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