void startAgentsOn(PerfTest perfTest, GrinderProperties grinderProperties, SingleConsole singleConsole) {
		int agentCount = perfTest.getAgentCount();
		perfTestService.markStatusAndProgress(perfTest, START_AGENTS, getSafe(agentCount)
				+ " agents are starting.");
		agentService.runAgent(perfTest, singleConsole, grinderProperties, getSafe(agentCount));
		singleConsole.waitUntilAgentPrepared(agentCount);
		perfTestService.markStatusAndProgress(perfTest, START_AGENTS_FINISHED, getSafe(agentCount)
				+ " agents are ready.");
	}
Start agents for the given {@link PerfTest}.

@param perfTest          perftest
@param grinderProperties grinder properties
@param singleConsole     console to be used.
ngrinder-controller/src/main/java/org/ngrinder/perftest/service/PerfTestRunnable.java