[async] Add option async_opt_fusion_max_iter (#2170)

taichi-dev · Jan 24, 2021 · 6779e0d · 6779e0d
1 parent 1b73055
commit 6779e0d
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Showing 3 changed files with 11 additions and 3 deletions.
diff --git a/taichi/program/async_engine.cpp b/taichi/program/async_engine.cpp
@@ -279,9 +279,14 @@ void AsyncEngine::flush() {
     }
     sfg->verify();
     if (program->config.async_opt_fusion) {
-      while (sfg->fuse()) {
-        debug_sfg("fuse");
-        modified = true;
+      auto max_iter = program->config.async_opt_fusion_max_iter;
+      for (int iter = 0; max_iter == 0 || iter < max_iter; iter++) {
+        if (sfg->fuse()) {
+          debug_sfg("fuse");
+          modified = true;
+        } else {
+          break;
+        }
       }
     }
     sfg->verify();

diff --git a/taichi/program/compile_config.h b/taichi/program/compile_config.h
@@ -65,6 +65,7 @@ struct CompileConfig {
   // Async options
   int async_opt_passes{3};
   bool async_opt_fusion{true};
+  int async_opt_fusion_max_iter{0};  // 0 means unlimited
   bool async_opt_listgen{true};
   bool async_opt_activation_demotion{true};
   bool async_opt_dse{true};

diff --git a/taichi/python/export_lang.cpp b/taichi/python/export_lang.cpp
@@ -168,6 +168,8 @@ void export_lang(py::module &m) {
       .def_readwrite("cc_link_cmd", &CompileConfig::cc_link_cmd)
       .def_readwrite("async_opt_passes", &CompileConfig::async_opt_passes)
       .def_readwrite("async_opt_fusion", &CompileConfig::async_opt_fusion)
+      .def_readwrite("async_opt_fusion_max_iter",
+                     &CompileConfig::async_opt_fusion_max_iter)
       .def_readwrite("async_opt_listgen", &CompileConfig::async_opt_listgen)
       .def_readwrite("async_opt_activation_demotion",
                      &CompileConfig::async_opt_activation_demotion)