From a6c8f66f4b7b543398ed6d31d84414ef34244448 Mon Sep 17 00:00:00 2001
From: Roll249 <80768386+Roll249@users.noreply.github.com>
Date: Sat, 31 May 2025 06:50:50 +0000
Subject: [PATCH 1/2] Implement cross-platform RAM capacity query in
 mem_tryGetLocalRamCapacityInBytes() for Linux, macOS, and Windows. Falls back
 to exception if not available.

---
 quest/src/core/memory.cpp | 36 +++++++++++++++++++++++++++++++-----
 1 file changed, 31 insertions(+), 5 deletions(-)

diff --git a/quest/src/core/memory.cpp b/quest/src/core/memory.cpp
index 36eedb596..74d228598 100644
--- a/quest/src/core/memory.cpp
+++ b/quest/src/core/memory.cpp
@@ -196,11 +196,37 @@ qindex mem_getMaxNumKrausMapMatricesBeforeLocalMemSizeofOverflow(int numQubits)
 
 
 qindex mem_tryGetLocalRamCapacityInBytes() {
-
-    /// @todo attempt to find total Ram
-
-    // if we're unable to find total RAM, throw an exception
-    // (which the caller should catch and gracefully continue)
+    // Linux: parse /proc/meminfo
+    #if defined(__linux__)
+    FILE* meminfo = fopen("/proc/meminfo", "r");
+    if (meminfo) {
+        char line[256];
+        while (fgets(line, sizeof(line), meminfo)) {
+            if (sscanf(line, "MemTotal: %lu kB", &mem_total_kb) == 1) {
+                fclose(meminfo);
+                return (qindex)mem_total_kb * 1024;
+            }
+        }
+        fclose(meminfo);
+    }
+    // macOS: use sysctl
+    #elif defined(__APPLE__)
+    #include <sys/types.h>
+    #include <sys/sysctl.h>
+    int mib[2] = {CTL_HW, HW_MEMSIZE};
+    int64_t memsize = 0;
+    size_t len = sizeof(memsize);
+    if (sysctl(mib, 2, &memsize, &len, NULL, 0) == 0 && memsize > 0)
+        return (qindex)memsize;
+    // Windows: use GlobalMemoryStatusEx
+    #elif defined(_WIN32)
+    #include <windows.h>
+    MEMORYSTATUSEX statex;
+    statex.dwLength = sizeof(statex);
+    if (GlobalMemoryStatusEx(&statex))
+        return (qindex)statex.ullTotalPhys;
+    #endif
+    // fallback: throw exception
     throw (mem::COULD_NOT_QUERY_RAM) false;
 }
 

From 6b5b7e214f6f602a92d249af6f022d215ac16552 Mon Sep 17 00:00:00 2001
From: Roll249 <80768386+Roll249@users.noreply.github.com>
Date: Sat, 31 May 2025 06:51:45 +0000
Subject: [PATCH 2/2] add

---
 build/CMakeCache.txt               | 53 ++++++++++++++++++++++++++++++
 build/CMakeFiles/cmake.check_cache |  1 +
 2 files changed, 54 insertions(+)
 create mode 100644 build/CMakeCache.txt
 create mode 100644 build/CMakeFiles/cmake.check_cache

diff --git a/build/CMakeCache.txt b/build/CMakeCache.txt
new file mode 100644
index 000000000..cea205a33
--- /dev/null
+++ b/build/CMakeCache.txt
@@ -0,0 +1,53 @@
+# This is the CMakeCache file.
+# For build in directory: /workspaces/QuEST/build
+# It was generated by CMake: /usr/bin/cmake
+# You can edit this file to change values found and used by cmake.
+# If you do not want to change any of the values, simply exit the editor.
+# If you do want to change a value, simply edit, save, and exit the editor.
+# The syntax for the file is as follows:
+# KEY:TYPE=VALUE
+# KEY is the name of a variable in the cache.
+# TYPE is a hint to GUIs for the type of VALUE, DO NOT EDIT TYPE!.
+# VALUE is the current value for the KEY.
+
+########################
+# EXTERNAL cache entries
+########################
+
+
+########################
+# INTERNAL cache entries
+########################
+
+//This is the directory where this CMakeCache.txt was created
+CMAKE_CACHEFILE_DIR:INTERNAL=/workspaces/QuEST/build
+//Major version of cmake used to create the current loaded cache
+CMAKE_CACHE_MAJOR_VERSION:INTERNAL=3
+//Minor version of cmake used to create the current loaded cache
+CMAKE_CACHE_MINOR_VERSION:INTERNAL=16
+//Patch version of cmake used to create the current loaded cache
+CMAKE_CACHE_PATCH_VERSION:INTERNAL=3
+//Path to CMake executable.
+CMAKE_COMMAND:INTERNAL=/usr/bin/cmake
+//Path to cpack program executable.
+CMAKE_CPACK_COMMAND:INTERNAL=/usr/bin/cpack
+//Path to ctest program executable.
+CMAKE_CTEST_COMMAND:INTERNAL=/usr/bin/ctest
+//Name of external makefile project generator.
+CMAKE_EXTRA_GENERATOR:INTERNAL=
+//Name of generator.
+CMAKE_GENERATOR:INTERNAL=Unix Makefiles
+//Generator instance identifier.
+CMAKE_GENERATOR_INSTANCE:INTERNAL=
+//Name of generator platform.
+CMAKE_GENERATOR_PLATFORM:INTERNAL=
+//Name of generator toolset.
+CMAKE_GENERATOR_TOOLSET:INTERNAL=
+//Source directory with the top level CMakeLists.txt file for this
+// project
+CMAKE_HOME_DIRECTORY:INTERNAL=/workspaces/QuEST
+//number of local generators
+CMAKE_NUMBER_OF_MAKEFILES:INTERNAL=1
+//Path to CMake installation.
+CMAKE_ROOT:INTERNAL=/usr/share/cmake-3.16
+
diff --git a/build/CMakeFiles/cmake.check_cache b/build/CMakeFiles/cmake.check_cache
new file mode 100644
index 000000000..3dccd7317
--- /dev/null
+++ b/build/CMakeFiles/cmake.check_cache
@@ -0,0 +1 @@
+# This file is generated by cmake for dependency checking of the CMakeCache.txt file