Change vec_sz and n_vecs settings for contiguous kernels

For short data types, each work-item may need to load several
elements to ensure that it uses all the data from cache-line.
For example, with simd32, we load 4 8-bit types (2 cache lines),
2 16-bit types, 1 32-bit and wider types.

n_vec is set to 1, to avoid cache thrashing due to second iteration
of some work-items beginning to access memory at higher addresses
while some work-items continue working on the lower addresses causing
cache evictions.

The size of the work-groups was increated from 128 to 256, which is
chosen so that all 8 threads of single vector with simd32 are used.

Author: oleksandr-pavlyk

dpctl/tensor/libtensor/include/kernels/elementwise_functions/abs.hpp

@@ -32,9 +32,11 @@
 #include <type_traits>
 
 #include "cabs_impl.hpp"
-#include "kernels/elementwise_functions/common.hpp"
+#include "vec_size_util.hpp"
 
 #include "kernels/dpctl_tensor_types.hpp"
+#include "kernels/elementwise_functions/common.hpp"
+
 #include "utils/offset_utils.hpp"
 #include "utils/type_dispatch_building.hpp"
 #include "utils/type_utils.hpp"
@@ -50,6 +52,7 @@ namespace abs
 
 namespace td_ns = dpctl::tensor::type_dispatch;
 
+using dpctl::tensor::kernels::vec_size_utils::VecSize_v;
 using dpctl::tensor::type_utils::is_complex;
 
 template <typename argT, typename resT> struct AbsFunctor
@@ -89,8 +92,8 @@ template <typename argT, typename resT> struct AbsFunctor
 
 template <typename argT,
           typename resT = argT,
-          unsigned int vec_sz = 4,
-          unsigned int n_vecs = 2,
+          unsigned int vec_sz = VecSize_v<argT, resT>,
+          unsigned int n_vecs = 1,
           bool enable_sg_loadstore = true>
 using AbsContigFunctor =
     elementwise_common::UnaryContigFunctor<argT,

dpctl/tensor/libtensor/include/kernels/elementwise_functions/acos.hpp

@@ -29,10 +29,12 @@
 #include <sycl/sycl.hpp>
 #include <type_traits>
 
-#include "kernels/elementwise_functions/common.hpp"
 #include "sycl_complex.hpp"
+#include "vec_size_util.hpp"
 
 #include "kernels/dpctl_tensor_types.hpp"
+#include "kernels/elementwise_functions/common.hpp"
+
 #include "utils/offset_utils.hpp"
 #include "utils/type_dispatch_building.hpp"
 #include "utils/type_utils.hpp"
@@ -48,6 +50,7 @@ namespace acos
 
 namespace td_ns = dpctl::tensor::type_dispatch;
 
+using dpctl::tensor::kernels::vec_size_utils::VecSize_v;
 using dpctl::tensor::type_utils::is_complex;
 
 template <typename argT, typename resT> struct AcosFunctor
@@ -128,8 +131,8 @@ template <typename argT, typename resT> struct AcosFunctor
 
 template <typename argTy,
           typename resTy = argTy,
-          unsigned int vec_sz = 4,
-          unsigned int n_vecs = 2,
+          unsigned int vec_sz = VecSize_v<argTy, resTy>,
+          unsigned int n_vecs = 1,
           bool enable_sg_loadstore = true>
 using AcosContigFunctor =
     elementwise_common::UnaryContigFunctor<argTy,

dpctl/tensor/libtensor/include/kernels/elementwise_functions/acosh.hpp

@@ -29,10 +29,12 @@
 #include <sycl/sycl.hpp>
 #include <type_traits>
 
-#include "kernels/elementwise_functions/common.hpp"
 #include "sycl_complex.hpp"
+#include "vec_size_util.hpp"
 
 #include "kernels/dpctl_tensor_types.hpp"
+#include "kernels/elementwise_functions/common.hpp"
+
 #include "utils/offset_utils.hpp"
 #include "utils/type_dispatch_building.hpp"
 #include "utils/type_utils.hpp"
@@ -48,6 +50,7 @@ namespace acosh
 
 namespace td_ns = dpctl::tensor::type_dispatch;
 
+using dpctl::tensor::kernels::vec_size_utils::VecSize_v;
 using dpctl::tensor::type_utils::is_complex;
 
 template <typename argT, typename resT> struct AcoshFunctor
@@ -155,8 +158,8 @@ template <typename argT, typename resT> struct AcoshFunctor
 
 template <typename argTy,
           typename resTy = argTy,
-          unsigned int vec_sz = 4,
-          unsigned int n_vecs = 2,
+          unsigned int vec_sz = VecSize_v<argTy, resTy>,
+          unsigned int n_vecs = 1,
           bool enable_sg_loadstore = true>
 using AcoshContigFunctor =
     elementwise_common::UnaryContigFunctor<argTy,

dpctl/tensor/libtensor/include/kernels/elementwise_functions/add.hpp

@@ -30,6 +30,8 @@
 #include <type_traits>
 
 #include "sycl_complex.hpp"
+#include "vec_size_util.hpp"
+
 #include "utils/offset_utils.hpp"
 #include "utils/type_dispatch_building.hpp"
 #include "utils/type_utils.hpp"
@@ -50,6 +52,8 @@ namespace add
 namespace td_ns = dpctl::tensor::type_dispatch;
 namespace tu_ns = dpctl::tensor::type_utils;
 
+using dpctl::tensor::kernels::vec_size_utils::VecSize_v;
+
 template <typename argT1, typename argT2, typename resT> struct AddFunctor
 {
 
@@ -110,8 +114,8 @@ template <typename argT1, typename argT2, typename resT> struct AddFunctor
 template <typename argT1,
           typename argT2,
           typename resT,
-          unsigned int vec_sz = 4,
-          unsigned int n_vecs = 2,
+          unsigned int vec_sz = VecSize_v<argT1, argT2, resT>,
+          unsigned int n_vecs = 1,
           bool enable_sg_loadstore = true>
 using AddContigFunctor =
     elementwise_common::BinaryContigFunctor<argT1,
@@ -410,8 +414,8 @@ template <typename argT, typename resT> struct AddInplaceFunctor
 
 template <typename argT,
           typename resT,
-          unsigned int vec_sz = 4,
-          unsigned int n_vecs = 2,
+          unsigned int vec_sz = VecSize_v<argT, resT>,
+          unsigned int n_vecs = 1,
           bool enable_sg_loadstore = true>
 using AddInplaceContigFunctor = elementwise_common::BinaryInplaceContigFunctor<
     argT,

dpctl/tensor/libtensor/include/kernels/elementwise_functions/angle.hpp

@@ -30,10 +30,12 @@
 #include <sycl/sycl.hpp>
 #include <type_traits>
 
-#include "kernels/elementwise_functions/common.hpp"
 #include "sycl_complex.hpp"
+#include "vec_size_util.hpp"
 
 #include "kernels/dpctl_tensor_types.hpp"
+#include "kernels/elementwise_functions/common.hpp"
+
 #include "utils/offset_utils.hpp"
 #include "utils/type_dispatch_building.hpp"
 #include "utils/type_utils.hpp"
@@ -49,6 +51,7 @@ namespace angle
 
 namespace td_ns = dpctl::tensor::type_dispatch;
 
+using dpctl::tensor::kernels::vec_size_utils::VecSize_v;
 using dpctl::tensor::type_utils::is_complex;
 
 template <typename argT, typename resT> struct AngleFunctor
@@ -74,8 +77,8 @@ template <typename argT, typename resT> struct AngleFunctor
 
 template <typename argTy,
           typename resTy = argTy,
-          unsigned int vec_sz = 4,
-          unsigned int n_vecs = 2,
+          unsigned int vec_sz = VecSize_v<argTy, resTy>,
+          unsigned int n_vecs = 1,
           bool enable_sg_loadstore = true>
 using AngleContigFunctor =
     elementwise_common::UnaryContigFunctor<argTy,

dpctl/tensor/libtensor/include/kernels/elementwise_functions/asin.hpp

@@ -29,10 +29,12 @@
 #include <sycl/sycl.hpp>
 #include <type_traits>
 
-#include "kernels/elementwise_functions/common.hpp"
 #include "sycl_complex.hpp"
+#include "vec_size_util.hpp"
 
 #include "kernels/dpctl_tensor_types.hpp"
+#include "kernels/elementwise_functions/common.hpp"
+
 #include "utils/offset_utils.hpp"
 #include "utils/type_dispatch_building.hpp"
 #include "utils/type_utils.hpp"
@@ -48,6 +50,7 @@ namespace asin
 
 namespace td_ns = dpctl::tensor::type_dispatch;
 
+using dpctl::tensor::kernels::vec_size_utils::VecSize_v;
 using dpctl::tensor::type_utils::is_complex;
 
 template <typename argT, typename resT> struct AsinFunctor
@@ -148,8 +151,8 @@ template <typename argT, typename resT> struct AsinFunctor
 
 template <typename argTy,
           typename resTy = argTy,
-          unsigned int vec_sz = 4,
-          unsigned int n_vecs = 2,
+          unsigned int vec_sz = VecSize_v<argTy, resTy>,
+          unsigned int n_vecs = 1,
           bool enable_sg_loadstore = true>
 using AsinContigFunctor =
     elementwise_common::UnaryContigFunctor<argTy,

dpctl/tensor/libtensor/include/kernels/elementwise_functions/asinh.hpp

@@ -29,10 +29,12 @@
 #include <sycl/sycl.hpp>
 #include <type_traits>
 
-#include "kernels/elementwise_functions/common.hpp"
 #include "sycl_complex.hpp"
+#include "vec_size_util.hpp"
 
 #include "kernels/dpctl_tensor_types.hpp"
+#include "kernels/elementwise_functions/common.hpp"
+
 #include "utils/offset_utils.hpp"
 #include "utils/type_dispatch_building.hpp"
 #include "utils/type_utils.hpp"
@@ -48,6 +50,7 @@ namespace asinh
 
 namespace td_ns = dpctl::tensor::type_dispatch;
 
+using dpctl::tensor::kernels::vec_size_utils::VecSize_v;
 using dpctl::tensor::type_utils::is_complex;
 
 template <typename argT, typename resT> struct AsinhFunctor
@@ -131,8 +134,8 @@ template <typename argT, typename resT> struct AsinhFunctor
 
 template <typename argTy,
           typename resTy = argTy,
-          unsigned int vec_sz = 4,
-          unsigned int n_vecs = 2,
+          unsigned int vec_sz = VecSize_v<argTy, resTy>,
+          unsigned int n_vecs = 1,
           bool enable_sg_loadstore = true>
 using AsinhContigFunctor =
     elementwise_common::UnaryContigFunctor<argTy,

dpctl/tensor/libtensor/include/kernels/elementwise_functions/atan.hpp

@@ -30,10 +30,12 @@
 #include <sycl/sycl.hpp>
 #include <type_traits>
 
-#include "kernels/elementwise_functions/common.hpp"
 #include "sycl_complex.hpp"
+#include "vec_size_util.hpp"
 
 #include "kernels/dpctl_tensor_types.hpp"
+#include "kernels/elementwise_functions/common.hpp"
+
 #include "utils/offset_utils.hpp"
 #include "utils/type_dispatch_building.hpp"
 #include "utils/type_utils.hpp"
@@ -49,6 +51,7 @@ namespace atan
 
 namespace td_ns = dpctl::tensor::type_dispatch;
 
+using dpctl::tensor::kernels::vec_size_utils::VecSize_v;
 using dpctl::tensor::type_utils::is_complex;
 
 template <typename argT, typename resT> struct AtanFunctor
@@ -138,8 +141,8 @@ template <typename argT, typename resT> struct AtanFunctor
 
 template <typename argTy,
           typename resTy = argTy,
-          unsigned int vec_sz = 4,
-          unsigned int n_vecs = 2,
+          unsigned int vec_sz = VecSize_v<argTy, resTy>,
+          unsigned int n_vecs = 1,
           bool enable_sg_loadstore = true>
 using AtanContigFunctor =
     elementwise_common::UnaryContigFunctor<argTy,

dpctl/tensor/libtensor/include/kernels/elementwise_functions/atan2.hpp

@@ -29,6 +29,8 @@
 #include <sycl/sycl.hpp>
 #include <type_traits>
 
+#include "vec_size_util.hpp"
+
 #include "utils/offset_utils.hpp"
 #include "utils/type_dispatch_building.hpp"
 #include "utils/type_utils.hpp"
@@ -48,6 +50,8 @@ namespace atan2
 namespace td_ns = dpctl::tensor::type_dispatch;
 namespace tu_ns = dpctl::tensor::type_utils;
 
+using dpctl::tensor::kernels::vec_size_utils::VecSize_v;
+
 template <typename argT1, typename argT2, typename resT> struct Atan2Functor
 {
 
@@ -68,8 +72,8 @@ template <typename argT1, typename argT2, typename resT> struct Atan2Functor
 template <typename argT1,
           typename argT2,
           typename resT,
-          unsigned int vec_sz = 4,
-          unsigned int n_vecs = 2,
+          unsigned int vec_sz = VecSize_v<argT1, argT2, resT>,
+          unsigned int n_vecs = 1,
           bool enable_sg_loadstore = true>
 using Atan2ContigFunctor =
     elementwise_common::BinaryContigFunctor<argT1,

dpctl/tensor/libtensor/include/kernels/elementwise_functions/atanh.hpp

@@ -30,10 +30,12 @@
 #include <sycl/sycl.hpp>
 #include <type_traits>
 
-#include "kernels/elementwise_functions/common.hpp"
 #include "sycl_complex.hpp"
+#include "vec_size_util.hpp"
 
 #include "kernels/dpctl_tensor_types.hpp"
+#include "kernels/elementwise_functions/common.hpp"
+
 #include "utils/offset_utils.hpp"
 #include "utils/type_dispatch_building.hpp"
 #include "utils/type_utils.hpp"
@@ -49,6 +51,7 @@ namespace atanh
 
 namespace td_ns = dpctl::tensor::type_dispatch;
 
+using dpctl::tensor::kernels::vec_size_utils::VecSize_v;
 using dpctl::tensor::type_utils::is_complex;
 
 template <typename argT, typename resT> struct AtanhFunctor
@@ -132,8 +135,8 @@ template <typename argT, typename resT> struct AtanhFunctor
 
 template <typename argTy,
           typename resTy = argTy,
-          unsigned int vec_sz = 4,
-          unsigned int n_vecs = 2,
+          unsigned int vec_sz = VecSize_v<argTy, resTy>,
+          unsigned int n_vecs = 1,
           bool enable_sg_loadstore = true>
 using AtanhContigFunctor =
     elementwise_common::UnaryContigFunctor<argTy,