Todd Gamblin a85b9070cb performance: avoid repeated DB locking on view generation ... `ViewDescriptor.regenerate()` checks repeatedly whether packages are installed and also does a lot of DB queries. Put a read transaction around the whole thing to avoid repeatedly locking and unlocking the DB.		2019-12-23 23:18:44 -08:00
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spack	performance: avoid repeated DB locking on view generation	2019-12-23 23:18:44 -08:00