support dynamical memory allocation ratio adjustment in micro-tuning for allocation exceed problem

python/akg/ops/array/four2five.py

@@ -116,8 +116,8 @@ def four2five_tiling_strategy_dynamic(tensor, input_format):
             strategy.append(ct_util.create_constraint_on_tensor(tensor, 16, ct_util.TileConstraint.FACTOR, 4)[0])
     return strategy
 
-@vc_util.check_input_type(akg.tvm.tensor.Tensor, str, str)
-def four2five(data, format_, dst_dtype='float16'):
+@vc_util.check_input_type(akg.tvm.tensor.Tensor, str, str, bool)
+def four2five(data, format_, dst_dtype='float16', need_custom_tiling=True):
     """
     Convert 4-dims "data" to 5-dims,the format of "data" is defined in "format_"
 
@@ -294,8 +294,9 @@ def four2five(data, format_, dst_dtype='float16'):
         dim_info, _ = four2five_set_dim_func(data, format_, dst_dtype)
         if dim_info != "":
             attrs["dim"] = dim_info
-        attrs["custom_tiling"] = four2five_tiling_strategy(output, format_, expansion)
-    else:
+        if need_custom_tiling:
+            attrs["custom_tiling"] = four2five_tiling_strategy(output, format_, expansion)
+    elif need_custom_tiling:
         attrs["custom_tiling"] = four2five_tiling_strategy_dynamic(output, format_)
 
     if is_dynamic:

src/codegen/util.cc

@@ -98,7 +98,13 @@ int AttrMap::GetIntAttr(const std::string &attr_name, int dft_value) {
   const NodeRef &e = this->at(attr_name);
   return ir::GetInt32Const(Downcast<Expr>(e));
 }
-
+double AttrMap::GetFloatAttr(const std::string &attr_name, double dft_value) {
+  if (this->count(attr_name) == 0) {
+    return dft_value;
+  }
+  const NodeRef &e = this->at(attr_name);
+  return ir::GetFloatConst(Downcast<Expr>(e));
+}
 bool AttrMap::GetBoolAttr(const std::string &attr_name, bool dft_value) {
   int result = GetIntAttr(attr_name, static_cast<int>(dft_value));
   CHECK(result == 0 || result == 1) << "Bool attribute " << attr_name << " must be 0 or 1, but found "

src/codegen/util.h

@@ -91,6 +91,11 @@ constexpr auto kEnableRemoveBroadcastCopy = "enable_remove_broadcast_copy";
 constexpr auto kEnableSubstituteDivVar = "enable_divide_var";
 constexpr auto kEnableComputeInPlace = "enable_compute_in_place";
 constexpr auto kEnableRewriteScalarCompute = "enable_rewrite_scalar_compute";
+constexpr auto kMaxNumRetryPoly = "max_num_retry_poly";
+constexpr auto kUBRatio = "ub_ratio";
+constexpr auto kErrorInfo = "";
+constexpr auto kErrorScope = "";
+constexpr auto kAllocBits = "alloc_bits";
 
 static std::unordered_map<std::string, int> help_tiling_level = {
   {"None", 0},
@@ -109,7 +114,7 @@ class AttrMap : public Map<std::string, NodeRef> {
 
   bool GetBoolAttr(const std::string &attr_name, bool dft_value);
   int GetIntAttr(const std::string &attr_name, int dft_value);
-
+  double GetFloatAttr(const std::string &attr_name, double dft_value);
   bool GetStringAttr(const std::string &attr_name, std::string *attr_to_set);
   std::string GetStringAttr(const std::string &attr_name, const std::string &dft_value);
 };

src/include/build_module.h

@@ -18,11 +18,33 @@
 #define INCLUDE_AKG_BUILD_MODULE_H_
 
 #include <string>
+#include <exception>
 
 #include "codegen/util.h"
 
 namespace akg {
 extern AttrMap global_attrs;
+
+/*
+ * Custom exception used when memory allocation fails and triggers micro-tuning to try to recover from failure.
+ */
+class MemoryAllocationException : public std::exception {
+ public:
+  MemoryAllocationException(const std::string &scope, uint64_t need_bits, uint64_t alloc_bits)
+      : scope_(scope), need_bits_(need_bits), alloc_bits_(alloc_bits){};
+
+  const char *what() const throw() {
+    std::runtime_error re(("Allocation exceed bound of memory tag " + scope_ + ": need " + std::to_string(need_bits_) +
+                           " bits, total alloc " + std::to_string(alloc_bits_) + " bits.")
+                            .c_str());
+    return re.what();
+  }
+
+  std::string scope_{""};
+  uint64_t need_bits_{0};
+  uint64_t alloc_bits_{0};
+};
+
 NodeRef Lower(Schedule sch, const Array<NodeRef> &in_args, const Array<NodeRef> &shape_vars, const std::string &name,
               const Map<Tensor, Buffer> &in_binds, const Map<std::string, NodeRef> &in_attrs, bool simple_mode,
               bool polyhedral, bool tuning, bool aicpu, const BuildConfig &config);

src/pass/storage_rewrite_cce.cc

@@ -26,6 +26,7 @@
 #include <regex>
 
 #include "ir_pass.h"
+#include "build_module.h"
 #include "pass/ir_util.h"
 #include "emit_insn/insn_info.h"
 #include "pass/storage_rewrite_cce.h"
@@ -1146,8 +1147,7 @@ bool StoragePlanRewriterCCE::DoRewrite(const std::string scope, std::vector<std:
       }
       if (spec_level <= 0 || child_idx < 0) {
         if (!is_dynamic_) {
-          LOG(FATAL) << "Allocation exceed bound of memory tag " << scope << ": need " << need_nbits
-                     << " bits, total alloc " << total_alloc_bits << " bits";
+          throw MemoryAllocationException(scope, need_nbits, total_alloc_bits);
         } else {
           LOG(WARNING) << "Dynamic shape static allocation exceed bound of memory tag " << scope << ": need "
                        << need_nbits << " bits, will use dynamic allocation instead";

src/poly/tiling_solver.cc

@@ -16,11 +16,63 @@
  */
 
 #include "poly/tiling_solver.h"
-
+#include "build_module.h"
 namespace akg {
 namespace ir {
 namespace poly {
+
+/*
+ * This function parse StorageFlatten error info into a ratio that guides the auto tiling to reduce
+ * memory allocation.
+ * e.g.
+ *  error info : Check failed: const_size * op->type.bits() <= info->max_num_bits (5242880 vs. 2097152) :
+ *               Allocation exceed bound of memory tag local.UB.
+ *  ratio      : memory_size / alloc_size = (2097152 / 5242880) = 0.4, which means the total allocation
+ *               size used in auto tiling shoulde reduce 0.4 times.
+ */
+double TilingSolver::GetNewAllocRatioWhenFlattenFail(const std::string &error_info) {
+  std::vector<std::string> sub_strs;
+  sub_strs = akg::common::Split(error_info, "(");
+  CHECK_GE(sub_strs.size(), 2U);
+  std::string tmp_str = sub_strs[2];
+  sub_strs = akg::common::Split(tmp_str, " ");
+  CHECK(!sub_strs.empty());
+  auto alloc_bits = static_cast<double>(std::strtod(sub_strs[0].c_str(), nullptr));
+
+  sub_strs = akg::common::Split(error_info, ")");
+  CHECK_GE(sub_strs.size(), 1U);
+  tmp_str = sub_strs[1];
+  sub_strs = akg::common::Split(tmp_str, " ");
+  CHECK(!sub_strs.empty());
+  auto memory_bits = static_cast<double>(std::strtod(sub_strs.back().c_str(), nullptr));
+
+  CHECK_NE(alloc_bits, 0);
+  return memory_bits / alloc_bits;
+}
+
+/*
+ * This function returns an adjust ratio that further reduces the memory allocation limit apart from
+ * the default percentage reserved for auto double buffer and try to generate smaller tile sizes that
+ * helps to recover from memory allocation failure such as the one in storage rewrite cce pass.
+ */
+double TilingSolver::GetNewAllocRatioWhenRewriteFail(int64_t memory_bits) {
+  auto actual_allocs = global_attrs.GetFloatAttr(kAllocBits, 0.0);
+  auto last_adjust_ratio = global_attrs.GetFloatAttr(kUBRatio, 1.0);
+  auto adjust_ratio = 1.0;
+
+  if (actual_allocs != 0) {
+    std::stringstream ss;
+    auto expect_allocs = memory_bits * last_adjust_ratio;
+    adjust_ratio = (expect_allocs / actual_allocs);
+    ss << "Adjust memory allocation ratio to " << adjust_ratio << " times and retry tiling.";
+    global_attrs.Set(kUBRatio, ktvm::make_const(Float(32), adjust_ratio));
+    analyzer_.logger_.AppendLog(MICRO_TUNING, ss);
+  }
+  return adjust_ratio;
+}
+
 void TilingSolver::CollectMemoryLimit() {
+  // Init memory allocation percentage.
   percentage_ = ALLOCATION_PERCENTAGE;
   for (auto attr : analyzer_.RootAxis()->attrs) {
     if (attr.attr_key != "MEM_RATIO") continue;
@@ -29,9 +81,27 @@ void TilingSolver::CollectMemoryLimit() {
     break;
   }
 
+  // Handle previous error info if storage flatten fails and adjust allocation percentage.
+  auto error_info = global_attrs.GetStringAttr(kErrorInfo, "");
+  if (!error_info.empty() && error_info.find("storage_flatten") != std::string::npos) {
+    std::stringstream ss;
+    ss << "Get Error Info! -> " << global_attrs.GetStringAttr(kErrorInfo, "");
+    percentage_ = percentage_ * GetNewAllocRatioWhenFlattenFail(error_info);
+    ss << "Adjust memory allocation to " << percentage_ << " of memory size and retry tiling.";
+    global_attrs.Set(kErrorInfo, StringImm::make(""));
+    analyzer_.logger_.AppendLog(MICRO_TUNING, ss);
+  }
+
+  // Init memory limit for each scope and reduce ratio of local.UB if storage rewrite fails previously.
   DavinciInfo &d_info = DavinciInfo::GetInstance();
+  auto error_scope = global_attrs.GetStringAttr(kErrorScope, "");
   for (auto i = 0; i < MEM_SCOPE_BULK; ++i) {
     this->mem_limit_[i] = d_info.GetMemoryLimitInScope(i) * percentage_;
+    if (i == DavinciMemScope::MEM_SCOPE_UB && error_scope == "local.UB") {
+      this->mem_limit_[i] =
+        std::max(static_cast<int>(this->mem_limit_[i] * GetNewAllocRatioWhenRewriteFail(this->mem_limit_[i])), 1);
+      global_attrs.Set(kErrorScope, StringImm::make(""));
+    }
   }
 }
 

src/poly/tiling_solver.h

@@ -30,6 +30,8 @@ class TilingSolver {
   ~TilingSolver() {}
   void CollectMemoryLimit();
   void CollectTileAxisTopDown();
+  double GetNewAllocRatioWhenFlattenFail(const std::string &error_info);
+  double GetNewAllocRatioWhenRewriteFail(int64_t memory_bits);
   TileCandidate *Solve();
 
   TilingAnalyzer &analyzer_;

src/poly/tiling_utils.cc

@@ -29,6 +29,8 @@ void TileLogger::AppendLine(LogStage stage, const std::string &line) {
     analyze_tiling_space_stage_.emplace_back(line);
   } else if (stage == DO_TILING) {
     do_tiling_stage_.emplace_back(line);
+  } else if (stage == MICRO_TUNING) {
+    micro_tuning_strage_.emplace_back(line);
   } else {
     do_tuning_stage_.emplace_back(line);
   }
@@ -70,6 +72,11 @@ bool TileLogger::DumpLogFile() {
     of << line << std::endl;
   }
   of << "=========================" << std::endl;
+  of << ">>>>>>>>>> Micro tuning stage <<<<<<<<<<<<" << std::endl;
+  for (const auto &line : micro_tuning_strage_) {
+    of << line << std::endl;
+  }
+  of << "=========================" << std::endl;
   of.close();
   return true;
 }

src/poly/tiling_utils.h

@@ -32,7 +32,7 @@ enum DavinciMemScope {
   MEM_SCOPE_L0C,
   MEM_SCOPE_BULK,
 };
-enum LogStage { ANA_SCHETREE, ANA_BUF_LIVE_EXTENT, ANA_TILING_SPACE, DO_TILING, DO_TUNING };
+enum LogStage { ANA_SCHETREE, ANA_BUF_LIVE_EXTENT, ANA_TILING_SPACE, DO_TILING, DO_TUNING, MICRO_TUNING };
 
 class DavinciInfo {
  public:
@@ -89,6 +89,7 @@ class TileLogger {
   LogFile analyze_tiling_space_stage_;
   LogFile do_tiling_stage_;
   LogFile do_tuning_stage_;
+  LogFile micro_tuning_strage_;
 };
 }  // namespace poly
 }  // namespace ir

tests/unittest/pass/test_micro_tuning.py

+# Copyright 2020 Huawei Technologies Co., Ltd
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""unittest for micro-tuning"""
+from akg.utils import kernel_exec
+from akg.ops.array import four2five
+
+
+def test_four2five_without_custom_tiling(build_shape, dtype, op_attrs):
+    """This test case will fail without cunstom tiling and micro-tuning will automatically adjust tile sizes."""
+    build_attr = op_attrs + [False]
+    return kernel_exec.op_build_test(four2five.four2five, [build_shape], [dtype], build_attr, kernel_name="four2five", attrs={}, tuning=False)
+
+
+if __name__ == "__main__":
+    test_four2five_without_custom_tiling(
+        [32, 1001, 1, 1], "float16", ['NCHW', 'float16'])

tests/unittest/unittest.sh

@@ -22,6 +22,7 @@ casefiles=(
 "pass/test_promote_if.py"
 "pass/test_sink_if.py"
 "pass/test_ir_parser.py"
+"pass/test_micro_tuning.py"
 "pass/test_elim_vector_mask.py"
 "pass/test_copy_propagation.py"
 "pass/test_utils_detect_non_linear_index.py"