Todd Gamblin c83e365c59 performance: only regenerate env views once in spack install ... `spack install` previously concretized, writes the entire environment out, regenerated views, then wrote and regenerated views again. Regenerating views is slow, so ensure that we only do that once. - [x] add an option to env.write() to skip view regeneration - [x] add a note on whether regenerate_views() shouldn't just be a separate operation -- not clear if we want to keep it as part of write to ensure consistency, or take it out to avoid performance issues.		2019-12-23 18:36:56 -08:00
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spack	performance: only regenerate env views once in spack install	2019-12-23 18:36:56 -08:00