fix(mge/dtr): fix dtr problem

GitOrigin-RevId: 2a703f9ee4ebf8667ac889a73f67c688dfebd9bc

imperative/src/impl/blob_manager_impl.cpp

@@ -41,6 +41,10 @@ void BlobManagerImpl::unregister_blob(Blob* blob) {
 }
 
 void BlobManagerImpl::alloc_with_defrag(Blob* blob, size_t size) {
+    if (custom_allocator) {
+        blob->m_storage = custom_allocator(blob->m_comp_node, size);
+        return;
+    }
     // try alloc
     MGB_TRY { alloc_direct(blob, size); }
     // if fail, try defrag, alloc again
@@ -61,6 +65,13 @@ void BlobManagerImpl::alloc_direct(Blob* blob, size_t size) {
 DeviceTensorND BlobManagerImpl::alloc_workspace_with_defrag(
         CompNode cn, TensorLayout& layout) {
     DeviceTensorND dev_tensor;
+    if (custom_allocator) {
+        DeviceTensorStorage storage(cn);
+        size_t sz = layout.dtype.size(layout.total_nr_elems());
+        storage.reset(cn, sz, custom_allocator(cn, sz));
+        dev_tensor.reset(storage, layout);
+        return dev_tensor;
+    }
     MGB_TRY { return alloc_workspace(cn, layout); }
     MGB_CATCH(MemAllocError&, {
         mgb_log_warn("memory allocation failed for workspace; try defragmenting");
@@ -78,6 +89,10 @@ DeviceTensorND BlobManagerImpl::alloc_workspace(CompNode cn, TensorLayout layout
     return dev_tensor;
 }
 
+void BlobManagerImpl::set_allocator(allocator_t allocator) {
+    custom_allocator = allocator;
+}
+
 void BlobManagerImpl::defrag(const CompNode& cn) {
     BlobSetWithMux* blobs_set_ptr;
     {
@@ -159,6 +174,9 @@ struct BlobManagerStub : BlobManager {
     void defrag(const CompNode& cn) {
         mgb_assert(0, "prohibited after global variable destruction");
     };
+    virtual void set_allocator(allocator_t allocator) {
+        mgb_assert(0, "prohibited after global variable destruction");
+    };
 };
 
 BlobManager* BlobManager::inst() {

imperative/src/impl/blob_manager_impl.h

@@ -45,6 +45,8 @@ class BlobManagerImpl final : public BlobManager {
 
     DeviceTensorND alloc_workspace(CompNode cn, TensorLayout layout);
 
+    BlobManager::allocator_t custom_allocator;
+
 public:
     static BlobManager* inst();
 
@@ -56,6 +58,8 @@ public:
     void register_blob(Blob* blob) override;
 
     void unregister_blob(Blob* blob) override;
+
+    void set_allocator(allocator_t allocator) override;
 };
 
 }  // namespace imperative

imperative/src/impl/interpreter/commands.h

@@ -49,6 +49,7 @@ struct ApplyOp {
     std::shared_ptr<OpDef> op;
     SmallVector<TensorInfo*> inputs;
     SmallVector<TensorInfo*> outputs;
+    SmallVector<LogicalTensorDesc> outputs_descs;
     bool validated = false;
 
     template <typename TFunctor>

imperative/src/impl/interpreter/interpreter_impl.cpp

@@ -114,11 +114,13 @@ ChannelImpl::WorkerState& ChannelImpl::get_worker_state() {
 void ChannelImpl::WorkQueue::on_async_queue_worker_thread_start() {
     sys::set_thread_name("worker");
     m_owner->m_worker_state.tid = std::this_thread::get_id();
-    OpDef::set_allocator([&](CompNode device, size_t size) {
+    auto custom_allocator = [&](CompNode device, size_t size) {
         auto blob = Blob::make(device, size);
         m_owner->alloc_tensor_with_evict(blob.get());
         return blob->storage();
-    });
+    };
+    OpDef::set_allocator(custom_allocator);
+    BlobManager::inst()->set_allocator(custom_allocator);
 }
 
 // Do not use m_xxx_state directly
@@ -353,7 +355,7 @@ void ChannelImpl::dispatch_kernel(
     for (int i = 0; i < output_descs.size(); ++i) {
         auto&& desc = output_descs[i];
         auto info = alloc();
-        init(info, std::move(desc));
+        init(info, desc);
         // make sure desc's value is consistent with h_value
         if (!info->desc.value.empty()) {
             info->h_value = HostTensorND::make_proxy(desc.value)
@@ -362,9 +364,9 @@ void ChannelImpl::dispatch_kernel(
         output_infos.push_back(info);
         outputs->push_back(reinterpret_cast<Handle>(info));
     }
-    ApplyOp cmd{
-            Profiler::next_id(), std::move(op), std::move(input_infos),
-            std::move(output_infos), validated};
+    ApplyOp cmd{Profiler::next_id(),     std::move(op),
+                std::move(input_infos),  std::move(output_infos),
+                std::move(output_descs), validated};
     if (Profiler::is_profiling()) {
         auto op_info_getter = [op = cmd.op] {
             std::unordered_map<std::string, std::string> op_info;
@@ -594,7 +596,7 @@ TensorInfo* ChannelImpl::alloc() {
     return info;
 }
 
-void ChannelImpl::init(TensorInfo* info, LogicalTensorDesc&& desc) {
+void ChannelImpl::init(TensorInfo* info, LogicalTensorDesc desc) {
     m_valid_handle.insert(reinterpret_cast<Handle>(info));
     MGB_RECORD_EVENT(TensorDeclareEvent, info->id, info->name);
     info->status = TensorInfo::Allocated;
@@ -692,6 +694,11 @@ void ChannelImpl::produce_tensor(TensorInfo* dest, TensorPtr ptr) {
                 "shape infer error, %s vs %s", dest->desc.layout.to_string().c_str(),
                 ptr->layout().to_string().c_str());
     }
+    // in order to avoid performance impact,
+    // memory forwarding is disabled when DTR is enabled
+    if (state.options.enable_dtr_auto_drop) {
+        ptr->to_contiguous_inplace();
+    }
     dest->desc.layout = ptr->layout();
     dest->desc.comp_node = ptr->comp_node();
     dest->memory = ptr->blob()->size();
@@ -719,8 +726,9 @@ void ChannelImpl::regenerate(TensorInfo* dest) {
     if (dest->evict_type == EvictType::DROP) {
         auto&& path = dest->producer;
         m_apply_stack.push(
-                {ApplyOp{path->id, path->op, path->inputs, path->outputs}, 0, dest,
-                 "dtr"});
+                {ApplyOp{path->id, path->op, path->inputs, path->outputs,
+                         path->outputs_descs},
+                 0, dest, "dtr"});
         if (!m_applying)
             flush_apply_stack();
     }
@@ -812,8 +820,8 @@ void ChannelImpl::do_apply_op(const ApplyOp& cmd, std::string reason) {
     }
     // Apply op
     SmallVector<LogicalTensorDesc> output_descs;
-    for (auto i : cmd.outputs) {
-        output_descs.push_back(i->desc);
+    for (auto i : cmd.outputs_descs) {
+        output_descs.push_back(i);
     }
     // Here std::move is REQUIRED for removing duplicated references.
     auto outputs = apply_on_physical_tensor(
@@ -1031,6 +1039,7 @@ std::unordered_set<TensorInfo*> ChannelImpl::collect_valid_tensors() {
 }
 
 void ChannelImpl::alloc_tensor_with_evict(Blob* x) {
+    bool in_worker = (get_worker_tid() == std::this_thread::get_id());
     auto reserve_size = [&](size_t size) {
         if (!m_dtr.comp_node.valid()) {
             return false;
@@ -1043,10 +1052,13 @@ void ChannelImpl::alloc_tensor_with_evict(Blob* x) {
         return true;
     };
     auto pre_level = set_log_level(LogLevel::NO_LOG);
+    if (in_worker) {
         reserve_size(x->size());
+    }
     MGB_TRY { BlobManager::inst()->alloc_direct(x, x->size()); }
     MGB_CATCH(MemAllocError&, {
         bool suc = false;
+        if (in_worker) {
             while (!suc) {
                 if (!auto_evict(1)) {
                     break;
@@ -1055,6 +1067,7 @@ void ChannelImpl::alloc_tensor_with_evict(Blob* x) {
                 MGB_CATCH(MemAllocError&, { continue; });
                 suc = true;
             }
+        }
         if (!suc) {
             set_log_level(pre_level);
             mgb_log_warn(
@@ -1143,10 +1156,10 @@ void ChannelImpl::process_one_task(Command& icmd) {
 
                 if (!inplace && !cross_cn && !m_dtr.is_bad_op(get_name(*cmd.op))) {
                     TensorInfo::ComputePath::make(
-                            cmd.id, cmd.op, cmd.inputs, cmd.outputs);
+                            cmd.id, cmd.op, cmd.inputs, cmd.outputs, cmd.outputs_descs);
                     size_t detach_cnt = 0;
                     if (!strcmp(get_name(*cmd.op), "BatchNorm") &&
-                        cmd.outputs.size() == 5) {
+                        cmd.outputs.size() == 6) {
                         cmd.outputs[0]->detach_producer();  // detach running_mean
                         cmd.outputs[1]->detach_producer();  // detach running_var
                         for (auto input : cmd.inputs) {

imperative/src/impl/interpreter/interpreter_impl.h

@@ -77,7 +77,7 @@ private:
     struct State;
 
     TensorInfo* alloc();
-    void init(TensorInfo*, LogicalTensorDesc&& desc);
+    void init(TensorInfo*, LogicalTensorDesc desc);
     void free(TensorInfo*);
     void real_free(TensorInfo*);
     void recursive_free(TensorInfo*);

imperative/src/impl/interpreter/tensor_info.h

@@ -91,6 +91,7 @@ struct TensorInfo {
         SmallVector<TensorInfo*> inputs;
         SmallVector<TensorInfo*> unique_inputs;
         SmallVector<TensorInfo*> outputs;
+        SmallVector<LogicalTensorDesc> outputs_descs;
 
         size_t ref_cnt() {
             return outputs.size() - std::count(outputs.begin(), outputs.end(), nullptr);
@@ -98,12 +99,14 @@ struct TensorInfo {
 
         static ComputePath* make(
                 uint64_t id, std::shared_ptr<OpDef> op, SmallVector<TensorInfo*> inputs,
-                SmallVector<TensorInfo*> outputs) {
+                SmallVector<TensorInfo*> outputs,
+                SmallVector<LogicalTensorDesc> outputs_descs) {
             auto* path = new TensorInfo::ComputePath();
             path->id = id;
             path->op = op;
             path->inputs = inputs;
             path->outputs = outputs;
+            path->outputs_descs = outputs_descs;
             // dedup
             SmallVector<TensorInfo*> unique_inputs = inputs;
             std::sort(unique_inputs.begin(), unique_inputs.end());

imperative/src/impl/physical_tensor.cpp

@@ -87,7 +87,7 @@ Blob::~Blob() {
 }
 
 const Blob::RawStorage& Blob::storage() {
-    if (!m_storage) {
+    if (!m_storage && m_size) {
         BlobManager::inst()->alloc_with_defrag(this, m_size);
     }
     return m_storage;

imperative/src/include/megbrain/imperative/blob_manager.h

@@ -18,6 +18,8 @@ namespace imperative {
 
 class BlobManager : public NonCopyableObj {
 public:
+    using allocator_t =
+            std::function<DeviceTensorStorage::RawStorage(CompNode, size_t)>;
     virtual ~BlobManager() = default;
 
     static BlobManager* inst();
@@ -26,6 +28,8 @@ public:
 
     virtual void alloc_with_defrag(Blob* blob, size_t size) = 0;
 
+    virtual void set_allocator(allocator_t allocator) = 0;
+
     virtual DeviceTensorND alloc_workspace_with_defrag(
             CompNode cn, TensorLayout& layout) = 0;
 

imperative/src/include/megbrain/imperative/physical_tensor.h

@@ -119,7 +119,7 @@ public:
         return make_scalar(value, m_blob->comp_node());
     }
 
-    BlobPtr blob() { return m_blob; }
+    BlobPtr& blob() { return m_blob; }
 
     void fetch_value();
     bool value_fetched();