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source common.sh
# First, test that -jN performs builds in parallel.
echo "testing nix-build -j..."
clearStore
rm -f $SHARED.cur $SHARED.max
outPath=$(nix-build -j10000 parallel.nix)
echo "output path is $outPath"
text=$(cat "$outPath")
if test "$text" != "abacade"; then exit 1; fi
if test "$(cat $SHARED.cur)" != 0; then fail "wrong current process count"; fi
if test "$(cat $SHARED.max)" != 3; then fail "not enough parallelism"; fi
# Second, test that parallel invocations of nix-build perform builds
# in parallel, and don't block waiting on locks held by the others.
echo "testing multiple nix-build -j1..."
clearStore
rm -f $SHARED.cur $SHARED.max
drvPath=$(nix-instantiate parallel.nix --argstr sleepTime 15)
cmd="nix-store -j1 -r $drvPath"
$cmd &
pid1=$!
echo "pid 1 is $pid1"
$cmd &
pid2=$!
echo "pid 2 is $pid2"
$cmd &
pid3=$!
echo "pid 3 is $pid3"
$cmd &
pid4=$!
echo "pid 4 is $pid4"
wait $pid1 || fail "instance 1 failed: $?"
wait $pid2 || fail "instance 2 failed: $?"
wait $pid3 || fail "instance 3 failed: $?"
wait $pid4 || fail "instance 4 failed: $?"
if test "$(cat $SHARED.cur)" != 0; then fail "wrong current process count"; fi
if test "$(cat $SHARED.max)" != 3; then fail "not enough parallelism"; fi
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