From 118f64f2060172a0baf9c24b9d7dd9f6752f931b Mon Sep 17 00:00:00 2001
From: Emil Sjolander <emilsj@fb.com>
Date: Thu, 11 Aug 2016 02:23:52 -0700
Subject: [PATCH] Add benchmarks and change repetition count

Summary: The previous repetition count did not scale to many benchmarks. Also add more benchmarks

Reviewed By: adamjernst

Differential Revision: D3697280

fbshipit-source-id: 56fe424f36936445f31d6e9fa080abbdd816d32d
---
 benchmarks/CSSBenchmark.c | 51 ++++++++++++++++++++++++++++++++++++---
 benchmarks/CSSBenchmark.h |  2 +-
 2 files changed, 49 insertions(+), 4 deletions(-)

diff --git a/benchmarks/CSSBenchmark.c b/benchmarks/CSSBenchmark.c
index 839be338..d86e7fb6 100644
--- a/benchmarks/CSSBenchmark.c
+++ b/benchmarks/CSSBenchmark.c
@@ -9,8 +9,20 @@
 
 #include "CSSBenchmark.h"
 
+#include <time.h>
 #include <CSSLayout/CSSLayout.h>
 
+// Measure functions can be quite slow, for example when measuring text.
+// Simulate this by sleeping for 1 millisecond.
+static CSSSize _measure(void *context, float width, CSSMeasureMode widthMode, float height, CSSMeasureMode heightMode) {
+  struct timespec sleeptime = {0, 1000000};
+  nanosleep(&sleeptime, NULL);
+  return (CSSSize) {
+    .width = widthMode == CSSMeasureModeUndefined ? 10 : width,
+    .height = heightMode == CSSMeasureModeUndefined ? 10 : width,
+  };
+}
+
 CSS_BENCHMARKS({
 
   CSS_BENCHMARK("Stack with flex", {
@@ -18,14 +30,47 @@ CSS_BENCHMARKS({
     CSSNodeStyleSetWidth(root, 100);
     CSSNodeStyleSetHeight(root, 100);
 
-    for (uint32_t i = 0; i < 3; i++) {
+    for (uint32_t i = 0; i < 10; i++) {
       CSSNodeRef child = CSSNodeNew();
-      CSSNodeStyleSetHeight(child, 20);
+      CSSNodeSetMeasureFunc(child, _measure);
       CSSNodeStyleSetFlex(child, 1);
       CSSNodeInsertChild(root, child, 0);
     }
 
-    CSSNodeCalculateLayout(root, 100, 100, CSSDirectionLTR);
+    CSSNodeCalculateLayout(root, CSSUndefined, CSSUndefined, CSSDirectionLTR);
+  });
+
+  CSS_BENCHMARK("Align stretch in undefined axis", {
+    CSSNodeRef root = CSSNodeNew();
+
+    for (uint32_t i = 0; i < 10; i++) {
+      CSSNodeRef child = CSSNodeNew();
+      CSSNodeStyleSetHeight(child, 20);
+      CSSNodeSetMeasureFunc(child, _measure);
+      CSSNodeInsertChild(root, child, 0);
+    }
+
+    CSSNodeCalculateLayout(root, CSSUndefined, CSSUndefined, CSSDirectionLTR);
+  });
+
+  CSS_BENCHMARK("Nested flex", {
+    CSSNodeRef root = CSSNodeNew();
+
+    for (uint32_t i = 0; i < 10; i++) {
+      CSSNodeRef child = CSSNodeNew();
+      CSSNodeSetMeasureFunc(child, _measure);
+      CSSNodeStyleSetFlex(child, 1);
+      CSSNodeInsertChild(root, child, 0);
+
+      for (uint32_t ii = 0; ii < 10; ii++) {
+        CSSNodeRef grandChild = CSSNodeNew();
+        CSSNodeSetMeasureFunc(grandChild, _measure);
+        CSSNodeStyleSetFlex(grandChild, 1);
+        CSSNodeInsertChild(child, grandChild, 0);
+      }
+    }
+
+    CSSNodeCalculateLayout(root, CSSUndefined, CSSUndefined, CSSDirectionLTR);
   });
 
 });
diff --git a/benchmarks/CSSBenchmark.h b/benchmarks/CSSBenchmark.h
index 7b5bc291..fdb0f5eb 100644
--- a/benchmarks/CSSBenchmark.h
+++ b/benchmarks/CSSBenchmark.h
@@ -14,7 +14,7 @@
 #include <stdint.h>
 #include <time.h>
 
-#define NUM_REPETITIONS 100000
+#define NUM_REPETITIONS 100
 
 #define CSS_BENCHMARKS(BLOCK)                                                                      \
   int main(int argc, char const *argv[]) {                                                         \