Todd Gamblin d79f85d763 perf: spack find -p now does only one DB transaction ... `spec.prefix` reads from Spack's database, and if you do this with multiple consecutive read transactions, it can take a long time. Or, at least, you can see the paths get written out one by one. This uses an outer read transaction to ensure that actual disk locks are acquired only once for the whole `spack find` operation, and that each transaction inside `spec.prefix` is an in-memory operation. This speeds up `spack find -p` a lot.		2019-09-03 07:41:38 -07:00
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spack	perf: spack find -p now does only one DB transaction	2019-09-03 07:41:38 -07:00