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store: Add "add-data-to-store-cache" profiling component.

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* guix/store.scm (add-data-to-store): Define 'lookup' and use it instead
of 'hash-ref'.
This commit is contained in:
Ludovic Courtès 2019-04-16 11:46:17 +02:00
parent e856177597
commit d1f7748a2e
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1 changed files with 40 additions and 2 deletions
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42
guix/store.scm
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@ -996,14 +996,52 @@ string). Raise an error if no such path exists."
(operation (add-text-to-store (string name) (bytevector text)
(string-list references))
#f
store-path)))
store-path))
(lookup (if (profiled? "add-data-to-store-cache")
(let ((lookups 0)
(hits 0)
(drv 0)
(scheme 0))
(define (show-stats)
(define (% n)
(if (zero? lookups)
100.
(* 100. (/ n lookups))))
(format (current-error-port) "
'add-data-to-store' cache:
lookups: ~5@a
hits: ~5@a (~,1f%)
.drv files: ~5@a (~,1f%)
Scheme files: ~5@a (~,1f%)~%"
lookups hits (% hits)
drv (% drv)
scheme (% scheme)))
(register-profiling-hook! "add-data-to-store-cache"
show-stats)
(lambda (cache args)
(let ((result (hash-ref cache args)))
(set! lookups (+ 1 lookups))
(when result
(set! hits (+ 1 hits)))
(match args
((_ name _)
(cond ((string-suffix? ".drv" name)
(set! drv (+ drv 1)))
((string-suffix? "-builder" name)
(set! scheme (+ scheme 1)))
((string-suffix? ".scm" name)
(set! scheme (+ scheme 1))))))
result)))
hash-ref)))
(lambda* (server name bytes #:optional (references '()))
"Add BYTES under file NAME in the store, and return its store path.
REFERENCES is the list of store paths referred to by the resulting store
path."
(let* ((args `(,bytes ,name ,references))
(cache (store-connection-add-text-to-store-cache server)))
(or (hash-ref cache args)
(or (lookup cache args)
(let ((path (add-text-to-store server name bytes references)))
(hash-set! cache args path)
path))))))