How do I run multiple spark applications in parallel in standalone master

Question

Using Spark(1.6.1) standalone master, I need to run multiple applications on same spark master. All application submitted after first one, keep on holding 'WAIT' state always. I also observed, the one running holds all cores sum of workers. I already tried limiting it by using SPARK_EXECUTOR_CORES but its for yarn config, while I am running is "standalone master". I tried running many workers on same master but every time first submitted application consumes all workers.