framework: set default processor num in choreography sched_policy

cyber/conf/example_choreagraphy_sched.conf

@@ -5,9 +5,9 @@ scheduler_conf {
   choreography_conf {
     choreography_processor_num: 8
     choreography_affinity: "range"
+    choreography_cpuset: "0-7"
     choreography_processor_policy: "SCHED_FIFO"
     choreography_processor_prio: 10
-    choreography_cpuset: "0-7"
 
     pool_processor_num: 8
     pool_affinity: "range"

cyber/scheduler/policy/scheduler_choreography.cc

@@ -80,9 +80,14 @@ SchedulerChoreography::SchedulerChoreography() {
 
   // default val for case w/o config:
   if (proc_num_ == 0) {
-    proc_num_ = std::thread::hardware_concurrency() / 4 * 3;
-    task_pool_size_ = std::thread::hardware_concurrency() / 4;
-    // FIXME: other vals ... ?
+    auto& global_conf = GlobalData::Instance()->Config();
+    if (global_conf.has_scheduler_conf() &&
+        global_conf.scheduler_conf().has_default_proc_num()) {
+      proc_num_ = global_conf.scheduler_conf().default_proc_num();
+    } else {
+      proc_num_ = 2;
+    }
+    task_pool_size_ = proc_num_;
   }
 
   CreateProcessor();