[sanitizer] adding a threaded performance stress test for malloc (useful for manual analysis of malloc performance)

llvm-svn: 279570

compiler-rt/lib/sanitizer_common/tests/malloc_stress_transfer_test.cc

@@ -0,0 +1,37 @@
+#include <thread>
+#include <iostream>
+
+const size_t kAllocSize = 16;
+const size_t kInitialNumAllocs = 1 << 10;
+const size_t kPeriodicNumAllocs = 1 << 10;
+const size_t kNumIterations = 1 << 7;
+const size_t kNumThreads = 16;
+
+void Thread() {
+  // int sp;
+  // std::cerr << "Thread starting, sp = " << &sp << std::endl;
+  char *InitialAllocations[kInitialNumAllocs];
+  char *PeriodicaAllocations[kPeriodicNumAllocs];
+  for (auto &p : InitialAllocations) p = new char[kAllocSize];
+  for (size_t i = 0; i < kNumIterations; i++) {
+    for (size_t j = 0; j < kPeriodicNumAllocs; j++) {
+      for (auto &p : PeriodicaAllocations) {
+        p = new char[kAllocSize];
+        *p = 0;
+      }
+      for (auto p : PeriodicaAllocations) delete [] p;
+    }
+  }
+  for (auto p : InitialAllocations) delete [] p;
+}
+
+int main() {
+//  Thread();
+//  return 0;
+  std::thread *Threads[kNumThreads];
+  for (auto &T : Threads) T = new std::thread(&Thread);
+  for (auto T : Threads) {
+    T->join();
+    delete T;
+  }
+}