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gexp: Cache the module to derivation mappings. 

This reduces the number of 'add-data-to-store' cache lookups from 3329
to 2743 (hit rate: 27% to 11%) when running:

  GUIX_PROFILING=add-data-to-store-cache guix build libreoffice -nd

Execution time of "guix build libreoffice -nd" goes from 1.86s to 1.80s.

* guix/gexp.scm (imported+compiled-modules): Wrap body in 'mcached'.
This commit is contained in:
Ludovic Courtès 2019-10-27 19:12:11 +01:00
parent c57e417eff
commit f5fca9a82c
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GPG Key ID: 090B11993D9AEBB5
1 changed files with 18 additions and 15 deletions
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33
guix/gexp.scm
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@ -660,21 +660,24 @@ names and file names suitable for the #:allowed-references argument to
(module-path %load-path))
"Return a pair where the first element is the imported MODULES and the
second element is the derivation to compile them."
(mlet %store-monad ((modules (if (pair? modules)
(imported-modules modules
#:system system
#:module-path module-path)
(return #f)))
(compiled (if (pair? modules)
(compiled-modules modules
#:system system
#:module-path module-path
#:extensions extensions
#:guile guile
#:deprecation-warnings
deprecation-warnings)
(return #f))))
(return (cons modules compiled))))
(mcached equal?
(mlet %store-monad ((modules (if (pair? modules)
(imported-modules modules
#:system system
#:module-path module-path)
(return #f)))
(compiled (if (pair? modules)
(compiled-modules modules
#:system system
#:module-path module-path
#:extensions extensions
#:guile guile
#:deprecation-warnings
deprecation-warnings)
(return #f))))
(return (cons modules compiled)))
modules
system extensions guile deprecation-warnings module-path))
(define* (lower-gexp exp
#:key