context: dump current load tracking stats

Dump the instantaneous load (last 5 seconds, extracted from load average)
and the computed target worker count (before rounding and truncation)
on the same status line as the task and worker thread count.

This should give better visibility into Task's thread count calculation
algorithm.

Signed-off-by: Zygo Blaxell <bees@furryterror.org>

src/bees-context.cc

@@ -84,7 +84,8 @@ BeesContext::dump_status()
 		ofs << "RATES:\n";
 		ofs << "\t" << avg_rates << "\n";
 
-		ofs << "THREADS (work queue " << TaskMaster::get_queue_count() << " of " << Task::instance_count() << " tasks, " << TaskMaster::get_thread_count() << " workers):\n";
+		const auto load_stats = TaskMaster::get_current_load();
+		ofs << "THREADS (work queue " << TaskMaster::get_queue_count() << " of " << Task::instance_count() << " tasks, " << TaskMaster::get_thread_count() << " workers, load: current " << load_stats.current_load << " target " << load_stats.thread_target << " average " << load_stats.loadavg << "):\n";
 		for (auto t : BeesNote::get_status()) {
 			ofs << "\ttid " << t.first << ": " << t.second << "\n";
 		}
@@ -152,8 +153,8 @@ BeesContext::show_progress()
 		BEESLOGINFO("\t" << deltaRates);
 
 		BEESNOTE("logging current thread status");
-		BEESLOGINFO("THREADS:");
-
+		const auto load_stats = TaskMaster::get_current_load();
+		BEESLOGINFO("THREADS (work queue " << TaskMaster::get_queue_count() << " of " << Task::instance_count() << " tasks, " << TaskMaster::get_thread_count() << " workers, load: current " << load_stats.current_load << " target " << load_stats.thread_target << " average " << load_stats.loadavg << "):");
 		for (auto t : BeesNote::get_status()) {
 			BEESLOGINFO("\ttid " << t.first << ": " << t.second);
 		}