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(svn r23491) -Document [FS#4846]: why we're not saving settings when OpenTTD crashes

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rubidium 2011-12-11 11:54:44 +00:00
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known-bugs.txt
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@ -380,3 +380,30 @@ Vehicles not keeping their "maximum" speed [FS#4815]:
It is possible to calculate whether the equilibrium will be
passed, but then all acceleration calculations need to be done
twice.
Settings not saved when OpenTTD crashes [FS#4846]:
The settings are not saved when OpenTTD crashes for several reasons.
The most important is that the game state is broken and as such the
settings might contain invalid values, or the settings have not even
been loaded yet. This would cause invalid or totally wrong settings
to be written to the configuration file.
A solution to that would be saving the settings whenever one changes,
however due to the way the configuration file is saved this requires
a flush of the file to the disk and OpenTTD needs to wait till that
is finished. On some file system implementations this causes the
flush of all 'write-dirty' caches, which can be a significant amount
of data to be written. This can further be aggravated by spinning
down disks to conserve power, in which case this disk needs to be
spun up first. This means that many seconds may pass before the
configuration file is actually written, and all that time OpenTTD
will not be able to show any progress. Changing the way the
configuration file is saved is not an option as that leaves us more
vulnerable to corrupt configuration files.
Finally, crashes should not be happening. If they happen they should
be reported and fixed, so essentially fixing this is fixing the
wrong thing. If you really need the configuration changes to be
saved, and you need to run a version that crashes regularly, then
you can use the 'saveconfig' command in the console to save the
settings.