Re: [Qemu-devel] [kvm-unit-tests PATCH v4 2/2] run_tests: allow run tests in parallel

[Peter Xu <peterx@redhat.com>]

On Tue, Jan 10, 2017 at 06:39:59PM +0100, Andrew Jones wrote:
> On Mon, Jan 09, 2017 at 12:04:54PM +0800, Peter Xu wrote:
> > run_task.sh is getting slow. This patch is trying to make it faster by
> > running the tests concurrently.
> > 
> > We provide a new parameter "-j" for the run_tests.sh, which can be used
> > to specify how many run queues we want for the tests. Default queue
> > length is 1, which is the old behavior.
> > 
> > Quick test on my laptop (4 cores, 2 threads each) shows 3x speed boost:
> > 
> >    |-----------------+-----------|
> >    | command         | time used |
> >    |-----------------+-----------|
> >    | run_test.sh     | 75s       |
> >    | run_test.sh -j8 | 27s       |
> >    |-----------------+-----------|
> > 
> > Signed-off-by: Peter Xu <peterx@redhat.com>
> > ---
> >  run_tests.sh        | 12 ++++++++++--
> >  scripts/common.bash | 16 +++++++++++++++-
> >  2 files changed, 25 insertions(+), 3 deletions(-)
> > 
> > diff --git a/run_tests.sh b/run_tests.sh
> > index 1e36d66..795cf73 100755
> > --- a/run_tests.sh
> > +++ b/run_tests.sh
> > @@ -13,10 +13,11 @@ function usage()
> >  {
> >  cat <<EOF
> >  
> > -Usage: $0 [-g group] [-h] [-v]
> > +Usage: $0 [-g group] [-h] [-v] [-j num_run_queues]
> >  
> >      -g: Only execute tests in the given group
> >      -h: Output this help text
> > +    -j: Execute tests in parallel
> >      -v: Enables verbose mode
> >  
> >  Set the environment variable QEMU=/path/to/qemu-system-ARCH to
> > @@ -28,7 +29,7 @@ EOF
> >  RUNTIME_arch_run="./$TEST_DIR/run"
> >  source scripts/runtime.bash
> >  
> > -while getopts "g:hv" opt; do
> > +while getopts "g:hj:v" opt; do
> >      case $opt in
> >          g)
> >              only_group=$OPTARG
> > @@ -37,6 +38,13 @@ while getopts "g:hv" opt; do
> >              usage
> >              exit
> >              ;;
> > +        j)
> > +            unittest_run_queues=$OPTARG
> > +            if ! (( "$unittest_run_queues" > 0 )); then
> 
> The equivalent expression without '!' is (( $var <= 0 )), and
> no need for the "'s around the var.
> 
> > +                echo "Invalid -j option: $unittest_run_queues"
> > +                exit 1
> > +            fi
> > +            ;;
> >          v)
> >              verbose="yes"
> >              ;;
> > diff --git a/scripts/common.bash b/scripts/common.bash
> > index 2dd7360..83aebf8 100644
> > --- a/scripts/common.bash
> > +++ b/scripts/common.bash
> > @@ -1,11 +1,19 @@
> >  : ${unittest_log_dir:=logs}
> > +: ${unittest_run_queues:=1}
> >  
> >  function run_task()
> >  {
> >  	local testname="$2"
> >  
> > +	while (( "$(jobs | wc -l)" == $unittest_run_queues )); do
> 
> Why the "'s? The result must resolve to an int, otherwise we don't
> want ((...))
> 
> > +		# wait for any background test to finish
> > +		wait -n
> > +	done
> > +
> >  	RUNTIME_log_file="${unittest_log_dir}/${testname}.log"
> > -	"$@"
> > +
> > +	# start the testcase in the background
> > +	"$@" &
> >  }
> >  
> >  function for_each_unittest()
> > @@ -22,6 +30,8 @@ function for_each_unittest()
> >  	local accel
> >  	local timeout
> >  
> > +	trap "wait; exit 130" SIGINT
> > +
> >  	exec {fd}<"$unittests"
> >  
> >  	while read -u $fd line; do
> > @@ -55,5 +65,9 @@ function for_each_unittest()
> >  		fi
> >  	done
> >  	run_task "$cmd" "$testname" "$groups" "$smp" "$kernel" "$opts" "$arch" "$check" "$accel" "$timeout"
> > +
> > +	# wait all task finish
> 
> wait until all tasks finish

Fixing all three places, thanks!

-- peterx