From 34797d8afc3c5f1211a4baf1161de640fc630a2e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ludovic=20Court=C3=A8s?= <ludo@gnu.org>
Date: Wed, 13 Dec 2017 15:01:07 +0100
Subject: hydra: Invalidate derivation caches after each architecture
 evaluation.

This reduces max RSS from 1.3G to 1.0G.

* guix/derivations.scm (invalidate-derivation-caches!): New procedure.
* build-aux/hydra/gnu-system.scm (hydra-jobs): Use it.  Add 'format'
call.
---
 build-aux/hydra/gnu-system.scm | 7 +++++++
 1 file changed, 7 insertions(+)

(limited to 'build-aux')

diff --git a/build-aux/hydra/gnu-system.scm b/build-aux/hydra/gnu-system.scm
index d9b9c55d9c..5aaac5220f 100644
--- a/build-aux/hydra/gnu-system.scm
+++ b/build-aux/hydra/gnu-system.scm
@@ -334,6 +334,13 @@ valid."
   (parameterize ((%graft? #f))
     ;; Return one job for each package, except bootstrap packages.
     (append-map (lambda (system)
+                  (format (current-error-port)
+                          "evaluating for '~a' (heap size: ~a MiB)...~%"
+                          system
+                          (round
+                           (/ (assoc-ref (gc-stats) 'heap-size)
+                              (expt 2. 20))))
+                  (invalidate-derivation-caches!)
                   (case subset
                     ((all)
                      ;; Build everything, including replacements.
-- 
cgit v1.2.3