refactor: reorganize tests

1 files changed, 49 insertions, 0 deletions

diff --git a/test/trace_demo.cpp b/test/trace_demo.cpp
new file mode 100644
index 0000000..d5dbce0
--- /dev/null
+++ b/test/trace_demo.cpp
@@ -0,0 +1,49 @@
+// a demo target for the flame-chart timeline: a nest of functions that call one
+// another so the timeline has real depth. main is the outermost (bottom row),
+// each callee stacks a row higher
+#include <chrono>
+#include <cstdio>
+#include <thread>
+
+// innermost: a chunk of busywork so the leaf calls have visible width
+auto leaf(int n) -> long
+{
+    long total = 0;
+    for (int i = 0; i < n * 60000; ++i)
+        total += i % 7;
+
+    return total;
+}
+
+// calls leaf a few times
+auto inner(int round) -> long
+{
+    long total = 0;
+    for (int i = 1; i <= 3; ++i)
+        total += leaf(round % 4 + i);
+
+    return total;
+}
+
+// calls inner, one level below main
+auto outer(int round) -> long
+{
+    const long a = inner(round);
+    std::this_thread::sleep_for(std::chrono::milliseconds(30));
+    const long b = inner(round + 1);
+    return a + b;
+}
+
+auto main() -> int
+{
+    for (int round = 0; round < 20; ++round)
+    {
+        const long result = outer(round);
+        std::printf("round %d -> %ld\n", round, result);
+        std::fflush(stdout);
+
+        std::this_thread::sleep_for(std::chrono::milliseconds(150));
+    }
+
+    std::puts("done");
+}