Exit hydrus normally and let the OS flush disk caches (either by letting the system run/"idle" for a while, running sync on *NIX systems, or normal shutdown), or.After running with synchronization set to zero you must either:.If you turn synchronization to 0 you are gambling, but it is a safe gamble if you have a backup and know exactly what you are doing.SSDs are 10-100x as slow as memory, and HDDs are 1000-10000x as slow as memory. It is always more expensive to access the disk than doing things in memory. It is nearly always safe to use -db_synchronous_override=1 on any modern filesystem and this is the default.This is a tutorial for advanced users who have read and understood this document and the risk/recovery procedure.Tuning your database synchronization using the -db_synchronous_override=0 launch argument can make Hydrus significantly faster with some caveats. These are complicated and use more experimental areas of the code to get their job done.Understanding Database Synchronization Options ΒΆ Once you are comfortable with parsers, and if you are feeling brave, check out how the default imageboard and pixiv parsers work. Once you are comfortable with these objects, you might like to check out these walkthroughs, which create full parsers from nothing: Page Parsers: Take parsable data, apply content parsers to it, and return all the metadata in an appropriate structure.Content Parsers: Take parsable data, apply a formula to it to get some strings, and apply a single metadata 'type' and perhaps some additional modifiers.Formulae: Take parsable data, search it in some manner, and return 0 to n strings.There are three main components in the parsing system (click to open each component's help page): Check out how the default parsers already in the client work, and if you want to write a new one, see if there is something already in there that is similar-it is usually easier to duplicate an existing parser and then alter it than to create a new one from scratch every time. You might like to open network->downloader components->manage parsers and explore the UI as you read these pages. Parsers are flexible and potentially quite complicated. In hydrus, a parser is an object that takes a single block of HTML or JSON data and returns many kinds of hydrus-level metadata.
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