diff --git a/examples/cpp/dot.cpp b/examples/cpp/dot.cpp
index 87bb739e2..3f04d01ad 100644
--- a/examples/cpp/dot.cpp
+++ b/examples/cpp/dot.cpp
@@ -6,6 +6,7 @@
 #include "triton/driver/stream.h"
 #include "triton/dnn/dot.h"
 #include "triton/tools/bench.hpp"
+#include "triton/external/half.hpp"
 #include "cuda.h"
 
 template<class T>
@@ -25,7 +26,7 @@ struct perf_t {
 
 
 perf_t do_bench(triton::driver::stream* stream, bool AT, bool BT, int32_t M, int32_t N, int32_t K){
-  typedef float NumericT;
+  typedef half NumericT;
   std::string ty = "half";
   size_t dt_nbytes = sizeof(NumericT);
   triton::driver::context* context = stream->context();
@@ -34,11 +35,11 @@ perf_t do_bench(triton::driver::stream* stream, bool AT, bool BT, int32_t M, int
   std::vector<NumericT> hb(K*N);
   srand(0);
   for(size_t i = 0; i < ha.size(); i++)
-    ha[i] = (NumericT)rand()/RAND_MAX;
+    ha[i] = static_cast<NumericT>((double)rand()/RAND_MAX);
   for(size_t i = 0; i < hb.size(); i++)
-    hb[i] = (NumericT)rand()/RAND_MAX;
+    hb[i] = static_cast<NumericT>((double)rand()/RAND_MAX);
   for(size_t i = 0; i < hc.size(); i++)
-    hc[i] = 0;
+    hc[i] = static_cast<NumericT>((double)0);
   triton::driver::buffer* dc = triton::driver::buffer::create(context, hc.size()*dt_nbytes);
   triton::driver::buffer* da = triton::driver::buffer::create(context, ha.size()*dt_nbytes);
   triton::driver::buffer* db = triton::driver::buffer::create(context, hb.size()*dt_nbytes);
@@ -48,7 +49,7 @@ perf_t do_bench(triton::driver::stream* stream, bool AT, bool BT, int32_t M, int
   stream->synchronize();
   triton::dnn::dot dot(M, N, K, AT, BT, ty, ty, 8, 8, 8);
   // benchmark triton
-  double triton_ns = triton::tools::bench([&]() { dot.enqueue(stream, {da, db, dc}, triton::dnn::FULL_TUNING);}, stream);
+  double triton_ns = triton::tools::bench([&]() { dot.enqueue(stream, {da, db, dc}, triton::dnn::NO_TUNING);}, stream);
   // benchmark cublas
 //  NumericT alpha = 1;
 //  NumericT beta = 0;
@@ -73,10 +74,10 @@ perf_t do_bench(triton::driver::stream* stream, bool AT, bool BT, int32_t M, int
 
   // test
   stream->read(dc, true, 0, hc);
-  std::vector<float> rc(hc.size());
+  std::vector<NumericT> rc(hc.size());
   dot.cpu_ref(rc, ha, hb);
   for(size_t i = 0; i < M*N; i++)
-    if(!std::isnan(hc[i]) && std::abs(hc[i] - rc[i])/std::max(hc[i], rc[i]) > 1e-4){
+    if(std::isnan(hc[i]) || std::abs(hc[i] - rc[i])/std::max(hc[i], rc[i]) > 1e-4){
       std::cout << i << " " << hc[i] << " " << rc[i] << std::endl;
       exit(EXIT_FAILURE);
     }
@@ -111,7 +112,7 @@ int main() {
   std::vector<config_t> configs = {
 //    {false, false, 8192, 512, 512},
 //    {false, true, 8192, 8192, 8192}
-    {true, true, 128, 128, 128},
+    {false, true, 128, 128, 128},
 //    {false, true, 32768, 256, 512}
 //    {true,  false, 8192, 512, 512},
 //    {true,  true,  8192, 512, 512}
diff --git a/include/triton/dnn/dot.h b/include/triton/dnn/dot.h
index c655d12b5..2beeede7b 100644
--- a/include/triton/dnn/dot.h
+++ b/include/triton/dnn/dot.h
@@ -42,9 +42,9 @@ public:
                       size_t M, size_t N, size_t K){
     for(size_t m = 0; m < M; m++)
     for(size_t n = 0; n < N; n++){
-      T acc = 0;
+      T acc = static_cast<T>((double)0);
       for(size_t k = 0; k < K; k++)
-        acc += (AT?a[k + m*K]:a[m + k*M]) * (BT?b[n + k*N]:b[k + n*K]);
+        acc = acc + (AT?a[k + m*K]:a[m + k*M]) * (BT?b[n + k*N]:b[k + n*K]);
       c[m + n*M] = acc;
     }
   }
diff --git a/include/triton/runtime/jit.h b/include/triton/runtime/jit.h
index fffec7794..ae227b135 100644
--- a/include/triton/runtime/jit.h
+++ b/include/triton/runtime/jit.h
@@ -73,7 +73,6 @@ public:
       optimize_dot.run(module);
       optimize_trans.run(module);
       optimize_dce.run(module);
-//      ir::print(module, std::cout);
     }
 
     void target_dependent(ir::module &module) {
diff --git a/lib/codegen/tune.cpp b/lib/codegen/tune.cpp
index bc4c7118d..b05f7e79e 100644
--- a/lib/codegen/tune.cpp
+++ b/lib/codegen/tune.cpp
@@ -194,7 +194,6 @@ std::vector<ir::metaparameter *> tune::get_params(ir::module &mod) {
   for(ir::instruction *i : block->get_inst_list())
   for(auto &x: params_[i])
     if(seen.insert(x.second).second && !x.second->has_value()){
-//      std::cout << i->get_name() << " " << x.first << std::endl;
       result.push_back(x.second);
     }
 
@@ -291,28 +290,29 @@ void tune::run(ir::module &mod) {
   }
 
   // initialize grids
+
+//  for(ir::instruction *i: grids_){
+//    auto shapes = i->get_type()->get_tile_shapes();
+//    for(size_t k = 0; k < shapes.size(); k++)
+//    if(shapes[k]->get_value() == 1) {
+//      if(fragments_.at({i, k}) == STRIDED_SCAN){
+//        params_.at(i).at("nts.d" + std::to_string(k))->set_value(1);
+//        params_.at(i).at("mts.d" + std::to_string(k))->set_value(1);
+//      }
+//      if(fragments_.at({i, k}) == HMMA_FRAGMENT_C){
+//        params_.at(i).at("fpw.d" + std::to_string(k))->set_value(1);
+//        params_.at(i).at("wpt.d" + std::to_string(k))->set_value(1);
+//      }
+//    }
+//  }
+}
+
+void tune::init(ir::module &mod) {
   for(ir::function *fn: mod.get_function_list()){
     std::map<ir::metaparameter*, ir::instruction*> references;
     create_grids(grids_, references, fn);
   }
 
-  for(ir::instruction *i: grids_){
-    auto shapes = i->get_type()->get_tile_shapes();
-    for(size_t k = 0; k < shapes.size(); k++)
-    if(shapes[k]->get_value() == 1) {
-      if(fragments_.at({i, k}) == STRIDED_SCAN){
-        params_.at(i).at("nts.d" + std::to_string(k))->set_value(1);
-        params_.at(i).at("mts.d" + std::to_string(k))->set_value(1);
-      }
-      if(fragments_.at({i, k}) == HMMA_FRAGMENT_C){
-        params_.at(i).at("fpw.d" + std::to_string(k))->set_value(1);
-        params_.at(i).at("wpt.d" + std::to_string(k))->set_value(1);
-      }
-    }
-  }
-}
-
-void tune::init(ir::module &mod) {
   num_threads_ = get_req_num_threads(grids_.front());
 }
 
@@ -407,7 +407,9 @@ bool tune::check_constraints(std::map<ir::value *, std::vector<std::string>> &er
       else {
         ir::metaparameter *fpw = params_[i]["fpw.d" + strk];
         ir::metaparameter *wpt = params_[i]["wpt.d" + strk];
-        multiple = fpw->get_value()*wpt->get_value()*8;
+        multiple = fpw->get_value()*wpt->get_value();
+        if(k < 2)
+          multiple *= 8;
       }
       if(shapes[k]->get_value() % multiple != 0)
         errors[i].push_back("for dim " + strk + ": shape (" + to_string(shapes[k]->get_value()) + ")"
diff --git a/lib/dnn/base.cpp b/lib/dnn/base.cpp
index 1ad741240..8c482b0b6 100644
--- a/lib/dnn/base.cpp
+++ b/lib/dnn/base.cpp
@@ -62,11 +62,11 @@ std::pair<base*, rt::jit*> base::get_profile_impl(driver::stream *stream, std::v
       jit->add_module(name_.c_str(), src.c_str(), best.params);
     }
     else{
-//      params_t params = heuristics();
+      params_t params = heuristics();
 //      params_t params = jit->get_valid(name_.c_str(), src.c_str());
 //      params_t params = {4, 1, 32, 4, 1, 32, 4, 4, 4, 1, 1, 16, 32, 16, 4, 4, 4, 4, 1}; //NT
 //      params_t params = {4, 1, 32, 4, 32, 4, 4, 4, 1, 1, 16, 32, 16, 1, 4, 4, 4, 4, 4, 1}; //NN
-      params_t params = {4, 32, 4, 1, 32, 4, 4, 4, 1, 1, 16, 1, 32, 16, 4, 4, 4, 4, 4, 1}; // TT
+//      params_t params = {4, 32, 4, 1, 32, 4, 4, 4, 1, 1, 16, 1, 32, 16, 4, 4, 4, 4, 4, 1}; // TT
       jit->add_module(name_.c_str(), src.c_str(), params);
     }
     triton::driver::kernel* kernel = jit->get_function(name_.c_str());
diff --git a/lib/dnn/dot.cpp b/lib/dnn/dot.cpp
index 83798921a..65395695c 100644
--- a/lib/dnn/dot.cpp
+++ b/lib/dnn/dot.cpp
@@ -74,8 +74,8 @@ void dot::enqueue_impl(driver::stream *stream, driver::kernel *kernel,
 void dot::triton_c_src(std::ostream &os) const {
   std::string AS0 = "TM", AS1 = "TK";
   std::string BS0 = "TK", BS1 = "TN";
-  std::string XAS0 = "TM", XAS1 = "TK/1", XAS2 = "1";
-  std::string XBS0 = "TK/1", XBS1 = "1", XBS2 = "TN";
+  std::string XAS0 = "TM", XAS1 = "TK", XAS2 = "1";
+  std::string XBS0 = "TK", XBS1 = "1", XBS2 = "TN";
   std::string bca0 = "[newaxis, :]", bca1 = "[:, newaxis]";
   std::string bcb0 = "[:, newaxis]", bcb1 = "[newaxis, :]";
   std::string lda0 = "*lda", lda1 = "";
@@ -105,11 +105,12 @@ void dot::triton_c_src(std::ostream &os) const {
   std::string align_ldb_str = "multiple_of(" + std::to_string(align_ldb_) + ")";
   std::string res =
 R"(
-const tunable int TM = {32};
-const tunable int TN = {32};
+const tunable int TM = {16, 32, 64, 128};
+const tunable int TN = {16, 32, 64, 128};
 const tunable int TK = {32};
 const tunable int GZ = {1};
 
+
 void matmul(restrict read_only align(16) )" + a_ty_ + R"( *A,
             restrict read_only align(16) )" + b_ty_ + R"( *B,
             restrict read_only align(16) float *C,
diff --git a/lib/runtime/jit.cpp b/lib/runtime/jit.cpp
index 1f6a60ccd..86102a460 100644
--- a/lib/runtime/jit.cpp
+++ b/lib/runtime/jit.cpp
@@ -37,13 +37,13 @@ void parallel_loop_nest(std::vector<size_t> const & ranges,
   size_t D = ranges.size();
   std::vector<size_t> values(D, 0);
   // thread pools
-  ThreadPool pool(nthreads);
+//  ThreadPool pool(nthreads);
   // Start with innermost loop
   size_t i = D - 1;
   while(true){
     //  Execute function
-    pool.enqueue(f,values);
-//    f(values);
+//    pool.enqueue(f,values);
+    f(values);
     while(values[i]++ == ranges[i] - 1){
       if(i == 0)
         return;