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[METAL] Fix flaky memory issue due to racing #14671

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merged 1 commit into from
Apr 19, 2023
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[METAL] Fix flaky memory issue due to racing #14671

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8 changes: 8 additions & 0 deletions src/runtime/metal/metal_device_api.mm
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Original file line number Diff line number Diff line change
Expand Up @@ -196,6 +196,10 @@ int GetWarpSize(id<MTLDevice> dev) {

void MetalWorkspace::FreeDataSpace(Device dev, void* ptr) {
AUTORELEASEPOOL {
// need to make sure buffer is not in use in command buffer
// before set the purgeable state to empty
// otherwise can cause issues sometimes
this->StreamSync(dev, nullptr);
// MTLBuffer PurgeableState should be set to empty before manual
// release in order to prevent memory leak
[(id<MTLBuffer>)ptr setPurgeableState:MTLPurgeableStateEmpty];
Expand Down Expand Up @@ -336,6 +340,10 @@ int GetWarpSize(id<MTLDevice> dev) {
if (temp_buffer_[dev.device_id] == nil || temp_buffer_[dev.device_id].length < size) {
id<MTLDevice> mtl_dev = MetalWorkspace::Global()->GetDevice(dev);
if (temp_buffer_[dev.device_id] != nil) {
// need to make sure buffer is not in use in command buffer
// before set the purgeable state to empty
// otherwise can cause issues sometimes
MetalWorkspace::Global()->StreamSync(dev, nullptr);
[temp_buffer_[dev.device_id] setPurgeableState:MTLPurgeableStateEmpty];
[temp_buffer_[dev.device_id] release];
}
Expand Down