echuraev commented on a change in pull request #7714:
URL: https://github.com/apache/tvm/pull/7714#discussion_r598418659
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File path: src/runtime/metal/metal_device_api.mm
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@@ -147,102 +155,110 @@ int GetWarpSize(id<MTLDevice> dev) {
void* MetalWorkspace::AllocDataSpace(TVMContext ctx, size_t nbytes, size_t
alignment,
DLDataType type_hint) {
- this->Init();
- id<MTLDevice> dev = GetDevice(ctx);
- // GPU memory only
- MTLResourceOptions storage_mode = MTLResourceStorageModePrivate;
- /*
- #if TARGET_OS_IPHONE
- storage_mode = MTLResourceStorageModeShared;
- #else
- storage_mode = MTLResourceStorageModeManaged;
- #endif
- */
- id<MTLBuffer> buf = [dev newBufferWithLength:nbytes options:storage_mode];
- ICHECK(buf != nil);
- return (void*)(CFBridgingRetain(buf));
+ @autoreleasepool {
+ this->Init();
+ id<MTLDevice> dev = GetDevice(ctx);
+ // GPU memory only
+ MTLResourceOptions storage_mode = MTLResourceStorageModePrivate;
+ /*
+ #if TARGET_OS_IPHONE
+ storage_mode = MTLResourceStorageModeShared;
+ #else
+ storage_mode = MTLResourceStorageModeManaged;
+ #endif
+ */
+ id<MTLBuffer> buf = [dev newBufferWithLength:nbytes options:storage_mode];
+ ICHECK(buf != nil);
+ return (void*)(buf);
Review comment:
`buf` won't be auto-released in this function. Quote from Apple
documentation:
> You take ownership of an object if you create it using a method whose name
begins with “alloc” or “new” or contains “copy” (for example, alloc, newObject,
or mutableCopy), or if you send it a retain message. You are responsible for
relinquishing ownership of objects you own using release or autorelease. Any
other time you receive an object, you must not release it.
We create `buf` by using method with "new". So, the `newBufferWithLength`
method returns the raw pointer on the memory not autoreleased pointer. Thus, we
should call `release` when it will be necessary to free this memory.
Also, I double-checked this by printing pointer address in `AllocDataSpace`
and `FreeDataSpace` the addresses were the same.
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