用dmsa的方式打开，启动pt时要加-multi_scenario参数：
pt_shell -multi_scenario

启动后在pt_shell里source如下脚本即load进了全部不同corner的pt session：
set_host_options -num_processes 5 -max_cores 8

create_scenario -name FUNC_SSHT_CMAX \
	-image saved_session_name_FUNC_SSHT_CMAX

create_scenario -name FUNC_SSLT_CMIN \
	-image saved_session_name_FUNC_SSLT_CMIN

create_scenario -name SCAN_SSHT_CMAX \
	-image saved_session_name_SCAN_SSHT_CMAX

create_scenario -name SCAN_SSLT_CMIN \
	-image saved_session_name_SCAN_SSLT_CMIN

start_hosts -min_hosts 5

report_host_usage -verbose

current_session -all