perf(debug): memory of the process and of its parts in the debug panel: resident, peak and private memory, card memory (GL_NVX_gpu_memory_info), the copies kept by the textures, geometry banks, models, scenery shapes and lines, sleepers and sound buffers

utilities/memorystats.cpp

@@ -0,0 +1,70 @@
+/*
+This Source Code Form is subject to the
+terms of the Mozilla Public License, v.
+2.0. If a copy of the MPL was not
+distributed with this file, You can
+obtain one at
+http://mozilla.org/MPL/2.0/.
+*/
+
+#include "stdafx.h"
+#include "utilities/memorystats.h"
+
+#if defined(_WIN32)
+#include <psapi.h>
+#pragma comment(lib, "psapi.lib")
+#elif defined(__APPLE__)
+#include <mach/mach.h>
+#else
+#include <fstream>
+#include <string>
+#endif
+
+process_memory query_process_memory()
+{
+	process_memory result;
+#if defined(_WIN32)
+	PROCESS_MEMORY_COUNTERS_EX counters{};
+	counters.cb = sizeof(counters);
+	if (::GetProcessMemoryInfo(::GetCurrentProcess(), reinterpret_cast<PROCESS_MEMORY_COUNTERS *>(&counters), sizeof(counters)))
+	{
+		result.valid = true;
+		result.resident = counters.WorkingSetSize;
+		result.peak = counters.PeakWorkingSetSize;
+		result.committed = counters.PrivateUsage;
+	}
+#elif defined(__APPLE__)
+	mach_task_basic_info info{};
+	mach_msg_type_number_t count{MACH_TASK_BASIC_INFO_COUNT};
+	if (::task_info(::mach_task_self(), MACH_TASK_BASIC_INFO, reinterpret_cast<task_info_t>(&info), &count) == KERN_SUCCESS)
+	{
+		result.valid = true;
+		result.resident = info.resident_size;
+		result.peak = info.resident_size_max;
+	}
+#else
+	// the lines of /proc/self/status give kB
+	std::ifstream status("/proc/self/status");
+	std::string line;
+	auto const value = [&line](char const *Key, std::uint64_t &Target) {
+		auto const length{std::char_traits<char>::length(Key)};
+		if (line.compare(0, length, Key) != 0)
+		{
+			return false;
+		}
+		Target = std::stoull(line.substr(length)) * 1024;
+		return true;
+	};
+	while (std::getline(status, line))
+	{
+		if (value("VmRSS:", result.resident))
+		{
+			result.valid = true;
+		}
+		value("VmHWM:", result.peak);
+		// resident private memory: the closest this has to private bytes
+		value("RssAnon:", result.committed);
+	}
+#endif
+	return result;
+}