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-rw-r--r--guix/store.scm41
1 files changed, 23 insertions, 18 deletions
diff --git a/guix/store.scm b/guix/store.scm
index 0463b0e8fa..89a719bcfc 100644
--- a/guix/store.scm
+++ b/guix/store.scm
@@ -1355,14 +1355,16 @@ on the build output of a previous derivation."
(unresolved things continue)
(continue #t)))
-(define (map/accumulate-builds store proc lst)
+(define* (map/accumulate-builds store proc lst
+ #:key (cutoff 30))
"Apply PROC over each element of LST, accumulating 'build-things' calls and
-coalescing them into a single call."
- (define accumulation-cutoff
- ;; Threshold above which we stop accumulating unresolved nodes to avoid
- ;; pessimal behavior where we keep stumbling upon the same .drv build
- ;; requests with many incoming edges. See <https://bugs.gnu.org/49439>.
- 30)
+coalescing them into a single call.
+
+CUTOFF is the threshold above which we stop accumulating unresolved nodes."
+
+ ;; The CUTOFF parameter helps avoid pessimal behavior where we keep
+ ;; stumbling upon the same .drv build requests with many incoming edges.
+ ;; See <https://bugs.gnu.org/49439>.
(define-values (result rest)
(let loop ((lst lst)
@@ -1373,7 +1375,7 @@ coalescing them into a single call."
(match (with-build-handler build-accumulator
(proc head))
((? unresolved? obj)
- (if (> unresolved accumulation-cutoff)
+ (if (>= unresolved cutoff)
(values (reverse (cons obj result)) tail)
(loop tail (cons obj result) (+ 1 unresolved))))
(obj
@@ -1390,17 +1392,20 @@ coalescing them into a single call."
;; REST is necessarily empty.
result)
(to-build
- ;; We've accumulated things TO-BUILD. Actually build them and resume the
- ;; corresponding continuations.
+ ;; We've accumulated things TO-BUILD; build them.
(build-things store (delete-duplicates to-build))
- (map/accumulate-builds store
- (lambda (obj)
- (if (unresolved? obj)
- ;; Pass #f because 'build-things' is now
- ;; unnecessary.
- ((unresolved-continuation obj) #f)
- obj))
- (append result rest)))))
+
+ ;; Resume the continuations corresponding to TO-BUILD, and then process
+ ;; REST.
+ (append (map/accumulate-builds store
+ (lambda (obj)
+ (if (unresolved? obj)
+ ;; Pass #f because 'build-things' is now
+ ;; unnecessary.
+ ((unresolved-continuation obj) #f)
+ obj))
+ result #:cutoff cutoff)
+ (map/accumulate-builds store proc rest #:cutoff cutoff)))))
(define build-things
(let ((build (operation (build-things (string-list things)