Add test for exploring memory usage

Author: mjp41

src/test/func/cleanup/cleanup.cc

@@ -0,0 +1,56 @@
+#include <snmalloc/snmalloc.h>
+
+#include <iostream>
+#include <thread>
+
+void ecall()
+{
+    snmalloc::ScopedAllocator a;
+    std::vector<void*> allocs;
+    size_t count = 0;
+    for (size_t j = 0; j < 1000; j++)
+    {
+        allocs.push_back(a.alloc.alloc(j % 1024));
+        count += j % 1024;
+    }
+    auto p = a.alloc.alloc(1 * 1024 * 1024);
+    memset(p, 0, 1 * 1024 * 1024);
+
+    for (size_t j = 0; j < allocs.size(); j++)
+        a.alloc.dealloc(allocs[j]);
+    
+    a.alloc.dealloc(p);
+}
+
+void thread_body()
+{
+  for (int i = 0; i < 10000; i++) {
+    ecall();
+    std::this_thread::sleep_for(std::chrono::milliseconds(10));
+  }
+}
+
+void monitor_body()
+{
+   for (int i = 0; i < 10000; i++) { 
+    std::cout << "Current: " << snmalloc::Alloc::StateHandle::get_current_usage() << std::endl;
+    std::cout << "Peak   : " << snmalloc::Alloc::StateHandle::get_peak_usage() << std::endl;
+    std::cout << "Allocs : " << snmalloc::Alloc::StateHandle::pool().get_count() << std::endl;
+    std::cout << "--------------------------------------------" << std::endl;
+    std::this_thread::sleep_for(std::chrono::seconds(1));
+   }
+}
+
+int main()
+{
+  std::vector<std::thread> threads;
+  for (int i = 0; i < 8; i++)
+  {
+    threads.push_back(std::thread(thread_body));
+  }
+  threads.push_back(std::thread(monitor_body));
+
+  for (auto& t : threads)
+    t.join();
+  return 0;
+}