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guix build: Add '--max-jobs' option.

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Suggested by Deck Pickard <deck.r.pickard@gmail.com>.

* guix/scripts/build.scm (show-build-options-help): Document
  --max-jobs.
  (set-build-options-from-command-line): Pass #:max-build-jobs.
  (%standard-build-options): Add --max-jobs.
* doc/guix.texi (Invoking guix-daemon): Document the meaning of
  '--max-jobs 0'.
  (Invoking guix build): Document --max-jobs, with a reference to
  "Invoking guix-daemon'.
This commit is contained in:
Ludovic Courtès 2014-11-25 22:32:26 +01:00
parent 1b366ee4f6
commit f6526eb330
2 changed files with 22 additions and 3 deletions
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10
doc/guix.texi
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@ -596,7 +596,9 @@ parallelism---for instance, by running @code{make -j$NIX_BUILD_CORES}.
@item --max-jobs=@var{n}
@itemx -M @var{n}
Allow at most @var{n} build jobs in parallel. The default value is
@code{1}.
@code{1}. Setting it to @code{0} means that no builds will be performed
locally; instead, the daemon will offload builds (@pxref{Daemon Offload
Setup}), or simply fail.
@item --debug
Produce debugging output.
@ -2765,6 +2767,12 @@ may be helpful when debugging setup issues with the build daemon.
Allow the use of up to @var{n} CPU cores for the build. The special
value @code{0} means to use as many CPU cores as available.
@item --max-jobs=@var{n}
@itemx -M @var{n}
Allow at most @var{n} build jobs in parallel. @xref{Invoking
guix-daemon, @code{--max-jobs}}, for details about this option and the
equivalent @command{guix-daemon} option.
@end table
Behind the scenes, @command{guix build} is essentially an interface to

15
guix/scripts/build.scm
View file

@ -119,7 +119,9 @@ (define (show-build-options-help)
(display (_ "
--verbosity=LEVEL use the given verbosity LEVEL"))
(display (_ "
-c, --cores=N allow the use of up to N CPU cores for the build")))
-c, --cores=N allow the use of up to N CPU cores for the build"))
(display (_ "
-M, --max-jobs=N allow at most N build jobs")))
(define (set-build-options-from-command-line store opts)
"Given OPTS, an alist as returned by 'args-fold' given
@ -128,6 +130,7 @@ (define (set-build-options-from-command-line store opts)
(set-build-options store
#:keep-failed? (assoc-ref opts 'keep-failed?)
#:build-cores (or (assoc-ref opts 'cores) 0)
#:max-build-jobs (or (assoc-ref opts 'max-jobs) 1)
#:fallback? (assoc-ref opts 'fallback?)
#:use-substitutes? (assoc-ref opts 'substitutes?)
#:use-build-hook? (assoc-ref opts 'build-hook?)
@ -192,7 +195,15 @@ (define %standard-build-options
(let ((c (false-if-exception (string->number arg))))
(if c
(apply values (alist-cons 'cores c result) rest)
(leave (_ "~a: not a number~%") arg)))))))
(leave (_ "not a number: '~a' option argument: ~a~%")
name arg)))))
(option '(#\M "max-jobs") #t #f
(lambda (opt name arg result . rest)
(let ((c (false-if-exception (string->number arg))))
(if c
(apply values (alist-cons 'max-jobs c result) rest)
(leave (_ "not a number: '~a' option argument: ~a~%")
name arg)))))))
;;;