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derivations: 'build-expression->derivation' caches its module derivations. 

This reduces the number of lookups in the 'add-data-to-store' cache from
7505 to 3329 (hit rate from 68% to 27%) when running:

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

The execution time of "guix build libreoffice -nd" goes from 2.12s to 1.87s.

* guix/derivations.scm (%module-cache): New variable.
(imported+compiled-modules)[key]: New variable.
Lookup KEY in %MODULE-CACHE and populate %MODULE-CACHE upon cache miss.
This commit is contained in:
Ludovic Courtès 2019-10-27 15:24:41 +01:00
parent cf7648f882
commit f726f6f802
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1 changed files with 14 additions and 2 deletions
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guix/derivations.scm
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@ -1207,13 +1207,25 @@ they can refer to each other."
#:guile-for-build guile
#:local-build? #t)))
(define %module-cache
;; Map a list of modules to its 'imported+compiled-modules' result.
(make-weak-value-hash-table))
(define* (imported+compiled-modules store modules #:key
(system (%current-system))
(guile (%guile-for-build)))
"Return a pair containing the derivation to import MODULES and that where
MODULES are compiled."
(cons (%imported-modules store modules #:system system #:guile guile)
(%compiled-modules store modules #:system system #:guile guile)))
(define key
(list modules (derivation-file-name guile) system))
(or (hash-ref %module-cache key)
(let ((result (cons (%imported-modules store modules
#:system system #:guile guile)
(%compiled-modules store modules
#:system system #:guile guile))))
(hash-set! %module-cache key result)
result)))
(define* (build-expression->derivation store name exp ;deprecated
#:key