Unit tests: Add optional benchmarks to unit tests

Author: tstenner

testing/CMakeLists.txt

@@ -32,6 +32,24 @@ add_executable(lsl_test_internal
 )
 target_link_libraries(lsl_test_internal PRIVATE lslobj lslboost catch_main)
 
+if(LSL_BENCHMARKS)
+	# to get somewhat reproducible performance numbers:
+	# /usr/bin/time -v testing/lsl_bench_exported --benchmark-samples 100 bounce
+	# [unix only]     |   binary                  |    nr. of samples   | test name
+	add_executable(lsl_bench_exported
+		bench_ext_bounce.cpp
+		bench_ext_common.cpp
+	)
+	target_link_libraries(lsl_bench_exported PRIVATE lsl catch_main)
+	installLSLApp(lsl_bench_exported)
+
+	add_executable(lsl_bench_internal
+		bench_int_sleep.cpp
+	)
+	target_link_libraries(lsl_bench_internal PRIVATE lslobj lslboost catch_main)
+	installLSLApp(lsl_bench_internal)
+endif()
+
 set(LSL_TESTS lsl_test_exported lsl_test_internal)
 foreach(lsltest ${LSL_TESTS})
 	add_test(NAME ${lsltest} COMMAND ${lsltest} --wait-for-keypress never)

testing/bench_ext_bounce.cpp

@@ -0,0 +1,19 @@
+#include "helpers.h"
+#include "catch.hpp"
+#include <lsl_cpp.h>
+
+TEST_CASE("bounce", "[basic][latency]") {
+	auto sp = create_streampair(lsl::stream_info("bounce", "Test"));
+
+	float data = .0;
+	BENCHMARK("single bounce") {
+		sp.out_.push_sample(&data);
+		sp.in_.pull_sample(&data, 1.);
+	};
+
+	sp.out_.push_sample(&data);
+	BENCHMARK("primed bounce") {
+		sp.out_.push_sample(&data);
+		sp.in_.pull_sample(&data, 1.);
+	};
+}

testing/bench_ext_common.cpp

@@ -0,0 +1,7 @@
+#include "catch.hpp"
+#include <lsl_c.h>
+
+TEST_CASE("common") {
+	BENCHMARK("lsl_clock") { return lsl_local_clock(); };
+}
+

testing/bench_int_sleep.cpp

@@ -0,0 +1,6 @@
+#include "catch.hpp"
+#include <thread>
+
+TEST_CASE("sleep") {
+	BENCHMARK("sleep1ms") { std::this_thread::sleep_for(std::chrono::milliseconds(1)); };
+}

testing/timesync.cpp

@@ -1,7 +1,6 @@
 #include "helpers.h"
 #include "catch.hpp"
 #include <lsl_cpp.h>
-#include <iostream>
 
 namespace {