use specific implementation to get available host memory on MacOS

src/coreComponents/common/LifoStorageCommon.hpp

@@ -19,7 +19,6 @@
 #include <mutex>
 #include <condition_variable>
 #include <camp/camp.hpp>
-#include <sys/stat.h>
 #include <fcntl.h>
 #include <unistd.h>
 #include <algorithm>
@@ -38,7 +37,7 @@
 #include "common/TimingMacros.hpp"
 #include "common/FixedSizeDequeWithMutexes.hpp"
 #include "common/MultiMutexesLock.hpp"
-
+#include "common/getAvailableMemory.hpp"
 
 namespace geos
 {
@@ -155,7 +154,7 @@ class LifoStorageCommon
   static int computeNumberOfBufferOnHost( int percent, size_t bufferSize, int maxNumberOfBuffers, int numberOfBuffersToStoreOnDevice )
   {
     GEOS_ERROR_IF( percent > 100, "Error, percentage of memory should be smallerer than -100, check lifoOnHost (should be greater that -100)" );
-    size_t free = sysconf( _SC_AVPHYS_PAGES ) * sysconf( _SC_PAGESIZE );
+    size_t free = getAvailableMemory();
     int numberOfBuffersToStoreOnHost = std::max( 1, std::min( ( int )( 0.01 * percent * free / bufferSize ), maxNumberOfBuffers - numberOfBuffersToStoreOnDevice ) );
     double freeGB = ( ( double ) free ) / ( 1024.0 * 1024.0 * 1024.0 ) / MpiWrapper::nodeCommSize();
     LIFO_LOG_RANK( " LIFO : available memory on host " << freeGB << " GB" );

src/coreComponents/common/getAvailableMemory.hpp

@@ -0,0 +1,56 @@
+#ifndef GET_AVAILABLE_MEMORY_HPP
+#define GET_AVAILABLE_MEMORY_HPP
+
+#include <sys/stat.h>
+#if defined __MACH__
+#include <sys/types.h>
+#include <sys/sysctl.h>
+
+#include <mach/host_info.h>
+#include <mach/mach_host.h>
+#include <mach/task_info.h>
+#include <mach/task.h>
+#endif
+
+namespace geos
+{
+/**
+ * @brief Retieves current available memory on host
+ * @return the available memory in bytes.
+ */
+static inline size_t getAvailableMemory()
+{
+#if defined(__APPLE__) && defined(__MACH__)
+  int mib[6];
+  mib[0] = CTL_HW;
+  mib[1] = HW_PAGESIZE;
+
+  int pagesize;
+  size_t length;
+  length = sizeof( pagesize );
+  if( sysctl( mib, 2, &pagesize, &length, NULL, 0 ) < 0 )
+  {
+    fprintf( stderr, "getting page size" );
+  }
+
+  mach_msg_type_number_t count = HOST_VM_INFO_COUNT;
+
+  vm_statistics_data_t vmstat;
+  if( host_statistics( mach_host_self(), HOST_VM_INFO, ( host_info_t ) &vmstat, &count ) != KERN_SUCCESS )
+  {
+    fprintf ( stderr, "Failed to get VM statistics." );
+  }
+
+  return vmstat.free_count * pagesize;
+#else
+  GEOS_ERROR_IF( percent > 100, "Error, percentage of memory should be smallerer than -100, check lifoOnHost (should be greater that -100)" );
+  return (size_t)sysconf( _SC_AVPHYS_PAGES ) *(size_t) sysconf( _SC_PAGESIZE );
+#endif
+}
+}
+
+// remove these definitions from mach/boolean.h that can conflict with GEOS code (eg. InputFlags::FALSE)
+#undef TRUE
+#undef FALSE
+
+#endif