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Retrieve heap size from MTLDevice on macOS and from free shared system memory on iOS.

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This commit is contained in:
Bill Hollings 2018-01-23 22:06:43 -05:00
parent 6753d90ac4
commit 89e1c92845
3 changed files with 41 additions and 7 deletions
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8
MoltenVK/MoltenVK/GPUObjects/MVKDevice.mm
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@ -842,13 +842,7 @@ void MVKPhysicalDevice::initMemoryProperties() {
_memoryProperties.memoryHeapCount = 1;
_memoryProperties.memoryHeaps[0].flags = (VK_MEMORY_HEAP_DEVICE_LOCAL_BIT);
#if MVK_MACOS
_memoryProperties.memoryHeaps[0].size = (VkDeviceSize)[_mtlDevice recommendedMaxWorkingSetSize];
#else
// TODO: determine heap size on iOS where recommenedMaxWorkingSetSize does not exist.
_memoryProperties.memoryHeaps[0].size = 0;
#endif
_memoryProperties.memoryHeaps[0].size = (VkDeviceSize)mvkRecommendedMaxWorkingSetSize(_mtlDevice);
_memoryProperties.memoryTypes[0].heapIndex = 0;
_memoryProperties.memoryTypes[0].propertyFlags = MVK_VK_MEMORY_TYPE_METAL_PRIVATE; // Private storage
_memoryProperties.memoryTypes[1].heapIndex = 0;

7
MoltenVK/MoltenVK/Utility/MVKOSExtensions.h
View File

@ -99,3 +99,10 @@ MVKOSVersion mvkOSVersion(void);
@end
#pragma mark -
#pragma mark MTLDevice
/** Returns an approximation of how much memory, in bytes, the device can use with good performance. */
uint64_t mvkRecommendedMaxWorkingSetSize(id<MTLDevice> mtlDevice);

33
MoltenVK/MoltenVK/Utility/MVKOSExtensions.mm
View File

@ -18,6 +18,10 @@
#include "MVKOSExtensions.h"
#include "MVKFoundation.h"
#import <mach/mach.h>
#import <mach/mach_host.h>
static const MVKOSVersion kMVKOSVersionUnknown = 0.0f;
@ -99,3 +103,32 @@ MVKOSVersion mvkOSVersion() {
@end
#pragma mark -
#pragma mark MTLDevice
uint64_t mvkRecommendedMaxWorkingSetSize(id<MTLDevice> mtlDevice) {
#if MVK_MACOS
if ( [mtlDevice respondsToSelector: @selector(recommendedMaxWorkingSetSize)]) {
return mtlDevice.recommendedMaxWorkingSetSize;
}
#endif
#if MVK_IOS
// GPU and CPU use shared memory. Estimate the current free memory in the system.
mach_port_t host_port;
mach_msg_type_number_t host_size;
vm_size_t pagesize;
host_port = mach_host_self();
host_size = sizeof(vm_statistics_data_t) / sizeof(integer_t);
host_page_size(host_port, &pagesize);
vm_statistics_data_t vm_stat;
if (host_statistics(host_port, HOST_VM_INFO, (host_info_t)&vm_stat, &host_size) == KERN_SUCCESS ) {
return vm_stat.free_count * pagesize;
}
#endif
return 128 * MEBI; // Conservative minimum for macOS GPU's & iOS shared memory
}