[commit: ghc] master: validate: add simple CPU count autodetection (f328890)

[git at git.haskell.org]

Repository : ssh://git@git.haskell.org/ghc

On branch  : master
Link       : http://ghc.haskell.org/trac/ghc/changeset/f328890021253c426b7450b6c5a1061d25f6219b/ghc

>---------------------------------------------------------------

commit f328890021253c426b7450b6c5a1061d25f6219b
Author: Sergei Trofimovich <slyfox at gentoo.org>
Date:   Tue Aug 19 16:54:13 2014 +0300

    validate: add simple CPU count autodetection
    
    Summary: Signed-off-by: Sergei Trofimovich <slyfox at gentoo.org>
    
    Test Plan: ran ./validate on linux
    
    Reviewers: austin
    
    Reviewed By: austin
    
    Subscribers: phaskell, simonmar, relrod, ezyang, carter
    
    Differential Revision: https://phabricator.haskell.org/D146


>---------------------------------------------------------------

f328890021253c426b7450b6c5a1061d25f6219b
 validate | 32 +++++++++++++++++++++++++++-----
 1 file changed, 27 insertions(+), 5 deletions(-)

diff --git a/validate b/validate
index 7a7b125..8ea9eac 100755
--- a/validate
+++ b/validate
@@ -88,6 +88,32 @@ check_packages () {
     echo "== End $1 package check"
 }
 
+detect_cpu_count () {
+    if [ "$CPUS" = "" ]; then
+        # Windows standard environment variable
+        CPUS="$NUMBER_OF_PROCESSORS"
+    fi
+
+    if [ "$CPUS" = "" ]; then
+        # Linux
+        CPUS=`getconf _NPROCESSORS_ONLN 2>/dev/null`
+    fi
+
+    if [ "$CPUS" = "" ]; then
+        # FreeBSD
+        CPUS=`getconf NPROCESSORS_ONLN 2>/dev/null`
+    fi
+
+    if [ "$CPUS" = "" ]; then
+        # nothing helped
+        CPUS="1"
+    fi
+
+    echo "using ${CPUS} CPUs" >&2
+}
+
+detect_cpu_count
+
 if ! [ -d testsuite ]
 then
     echo 'Could not find the testsuite for validation' >&2
@@ -95,11 +121,7 @@ then
 fi
 
 if [ "$THREADS" = "" ]; then
-    if [ "$CPUS" = "" ]; then
-        threads=2
-    else
-        threads=$(($CPUS + 1)) # `expr $CPUS + 1`
-    fi
+    threads=$(($CPUS + 1)) # `expr $CPUS + 1`
 else
     threads="$THREADS"
 fi