WIP: Undo / Redo memory limiting by releasing the least recently

used snapshots. Memory limit set to 10% of physical system memory.

src/libslic3r/TriangleMesh.cpp

@@ -607,6 +607,12 @@ void TriangleMesh::require_shared_vertices()
     BOOST_LOG_TRIVIAL(trace) << "TriangleMeshSlicer::require_shared_vertices - end";
 }
 
+size_t TriangleMesh::memsize() const
+{
+	size_t memsize = 8 + this->stl.memsize() + this->its.memsize();
+	return memsize;
+}
+
 void TriangleMeshSlicer::init(const TriangleMesh *_mesh, throw_on_cancel_callback_type throw_on_cancel)
 {
     mesh = _mesh;

src/libslic3r/TriangleMesh.hpp

@@ -67,6 +67,8 @@ public:
     size_t facets_count() const { return this->stl.stats.number_of_facets; }
     bool   empty() const { return this->facets_count() == 0; }
     bool is_splittable() const;
+    // Estimate of the memory occupied by this structure.
+    size_t memsize() const;
 
     stl_file stl;
     indexed_triangle_set its;

src/libslic3r/Utils.hpp

@@ -21,6 +21,8 @@ extern std::string format_memsize_MB(size_t n);
 // The string is non-empty only if the loglevel >= info (3).
 extern std::string log_memory_info();
 extern void disable_multi_threading();
+// Returns the size of physical memory (RAM) in bytes.
+extern size_t total_physical_memory();
 
 // Set a path with GUI resource files.
 void set_var_dir(const std::string &path);

src/libslic3r/utils.cpp

@@ -7,10 +7,15 @@
 #include <stdio.h>
 
 #ifdef WIN32
-#include <windows.h>
-#include <psapi.h>
+	#include <windows.h>
+	#include <psapi.h>
 #else
-#include <unistd.h>
+	#include <unistd.h>
+	#include <sys/types.h>
+	#include <sys/param.h>
+	#ifdef BSD
+		#include <sys/sysctl.h>
+	#endif
 #endif
 
 #include <boost/log/core.hpp>
@@ -467,4 +472,75 @@ std::string log_memory_info()
 }
 #endif
 
+// Returns the size of physical memory (RAM) in bytes.
+// http://nadeausoftware.com/articles/2012/09/c_c_tip_how_get_physical_memory_size_system
+size_t total_physical_memory()
+{
+#if defined(_WIN32) && (defined(__CYGWIN__) || defined(__CYGWIN32__))
+	// Cygwin under Windows. ------------------------------------
+	// New 64-bit MEMORYSTATUSEX isn't available.  Use old 32.bit
+	MEMORYSTATUS status;
+	status.dwLength = sizeof(status);
+	GlobalMemoryStatus( &status );
+	return (size_t)status.dwTotalPhys;
+#elif defined(_WIN32)
+	// Windows. -------------------------------------------------
+	// Use new 64-bit MEMORYSTATUSEX, not old 32-bit MEMORYSTATUS
+	MEMORYSTATUSEX status;
+	status.dwLength = sizeof(status);
+	GlobalMemoryStatusEx( &status );
+	return (size_t)status.ullTotalPhys;
+#elif defined(__unix__) || defined(__unix) || defined(unix) || (defined(__APPLE__) && defined(__MACH__))
+	// UNIX variants. -------------------------------------------
+	// Prefer sysctl() over sysconf() except sysctl() HW_REALMEM and HW_PHYSMEM
+
+#if defined(CTL_HW) && (defined(HW_MEMSIZE) || defined(HW_PHYSMEM64))
+	int mib[2];
+	mib[0] = CTL_HW;
+#if defined(HW_MEMSIZE)
+	mib[1] = HW_MEMSIZE;            // OSX. ---------------------
+#elif defined(HW_PHYSMEM64)
+	mib[1] = HW_PHYSMEM64;          // NetBSD, OpenBSD. ---------
+#endif
+	int64_t size = 0;               // 64-bit
+	size_t len = sizeof( size );
+	if ( sysctl( mib, 2, &size, &len, NULL, 0 ) == 0 )
+		return (size_t)size;
+	return 0L;			// Failed?
+
+#elif defined(_SC_AIX_REALMEM)
+	// AIX. -----------------------------------------------------
+	return (size_t)sysconf( _SC_AIX_REALMEM ) * (size_t)1024L;
+
+#elif defined(_SC_PHYS_PAGES) && defined(_SC_PAGESIZE)
+	// FreeBSD, Linux, OpenBSD, and Solaris. --------------------
+	return (size_t)sysconf( _SC_PHYS_PAGES ) *
+		(size_t)sysconf( _SC_PAGESIZE );
+
+#elif defined(_SC_PHYS_PAGES) && defined(_SC_PAGE_SIZE)
+	// Legacy. --------------------------------------------------
+	return (size_t)sysconf( _SC_PHYS_PAGES ) *
+		(size_t)sysconf( _SC_PAGE_SIZE );
+
+#elif defined(CTL_HW) && (defined(HW_PHYSMEM) || defined(HW_REALMEM))
+	// DragonFly BSD, FreeBSD, NetBSD, OpenBSD, and OSX. --------
+	int mib[2];
+	mib[0] = CTL_HW;
+#if defined(HW_REALMEM)
+	mib[1] = HW_REALMEM;		// FreeBSD. -----------------
+#elif defined(HW_PYSMEM)
+	mib[1] = HW_PHYSMEM;		// Others. ------------------
+#endif
+	unsigned int size = 0;		// 32-bit
+	size_t len = sizeof( size );
+	if ( sysctl( mib, 2, &size, &len, NULL, 0 ) == 0 )
+		return (size_t)size;
+	return 0L;			// Failed?
+#endif // sysctl and sysconf variants
+
+#else
+	return 0L;			// Unknown OS.
+#endif
+}
+
 }; // namespace Slic3r