tests/check: Dynamic parallism choice

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>

diff --git a/tests/check b/tests/check
index 409865513d467a11e2730a18cc5c26d73b51adb6..1921877bb0ffc0798128ffb65a7c7bb4b8eae12c 100755 (executable)
--- a/tests/check
+++ b/tests/check
@@ -1,6 +1,9 @@
-#!/bin/sh
+#!/bin/bash
 set -e
 
+j=$(nproc 2>/dev/null || echo 1)
+j=$(( $j * 5 / 4 + 1 ))
+
 x () { echo "$@"; "$@"; }
-x ${MAKE-make} -f tests/tests.mk -j8
+x ${MAKE-make} -f tests/tests.mk -j$j
 echo 'ok.'