diff --git a/examples/sparse_blas/run_time_dispatching/sparse_blas_spmv_usm.cpp b/examples/sparse_blas/run_time_dispatching/sparse_blas_spmv_usm.cpp
index f93569a92..d87297600 100644
--- a/examples/sparse_blas/run_time_dispatching/sparse_blas_spmv_usm.cpp
+++ b/examples/sparse_blas/run_time_dispatching/sparse_blas_spmv_usm.cpp
@@ -93,6 +93,7 @@ int run_sparse_matrix_vector_multiply_example(const sycl::device &dev) {
     std::size_t sizeja = static_cast<std::size_t>(27 * nrows);
     std::size_t sizeia = static_cast<std::size_t>(nrows + 1);
     std::size_t sizevec = static_cast<std::size_t>(nrows);
+    auto sizevec_i64 = static_cast<std::int64_t>(sizevec);
 
     ia = (intType *)sycl::malloc_shared(sizeia * sizeof(intType), main_queue);
     ja = (intType *)sycl::malloc_shared(sizeja * sizeof(intType), main_queue);
@@ -148,10 +149,8 @@ int run_sparse_matrix_vector_multiply_example(const sycl::device &dev) {
     // Create and initialize dense vector handles
     oneapi::mkl::sparse::dense_vector_handle_t x_handle = nullptr;
     oneapi::mkl::sparse::dense_vector_handle_t y_handle = nullptr;
-    oneapi::mkl::sparse::init_dense_vector(main_queue, &x_handle,
-                                           static_cast<std::int64_t>(sizevec), x);
-    oneapi::mkl::sparse::init_dense_vector(main_queue, &y_handle,
-                                           static_cast<std::int64_t>(sizevec), y);
+    oneapi::mkl::sparse::init_dense_vector(main_queue, &x_handle, sizevec_i64, x);
+    oneapi::mkl::sparse::init_dense_vector(main_queue, &y_handle, sizevec_i64, y);
 
     // Create operation descriptor
     oneapi::mkl::sparse::spmv_descr_t descr = nullptr;
diff --git a/src/sparse_blas/backends/cusparse/operations/cusparse_spmm.cpp b/src/sparse_blas/backends/cusparse/operations/cusparse_spmm.cpp
index a0e89162b..73a47c959 100644
--- a/src/sparse_blas/backends/cusparse/operations/cusparse_spmm.cpp
+++ b/src/sparse_blas/backends/cusparse/operations/cusparse_spmm.cpp
@@ -122,9 +122,8 @@ inline void common_spmm_optimize(
     detail::check_valid_spmm_common(__func__, A_view, A_handle, B_handle, C_handle,
                                     is_alpha_host_accessible, is_beta_host_accessible);
     if (!spmm_descr->buffer_size_called) {
-        throw mkl::uninitialized(
-            "sparse_blas", __func__,
-            "spmm_buffer_size must be called with the same arguments before spmm_optimize.");
+        throw mkl::uninitialized("sparse_blas", __func__,
+                                 "spmm_buffer_size must be called before spmm_optimize.");
     }
     spmm_descr->optimized_called = true;
     spmm_descr->last_optimized_opA = opA;
@@ -238,9 +237,8 @@ sycl::event spmm(sycl::queue& queue, oneapi::mkl::transpose opA, oneapi::mkl::tr
     }
 
     if (!spmm_descr->optimized_called) {
-        throw mkl::uninitialized(
-            "sparse_blas", __func__,
-            "spmm_optimize must be called with the same arguments before spmm.");
+        throw mkl::uninitialized("sparse_blas", __func__,
+                                 "spmm_optimize must be called before spmm.");
     }
     CHECK_DESCR_MATCH(spmm_descr, opA, "spmm_optimize");
     CHECK_DESCR_MATCH(spmm_descr, opB, "spmm_optimize");
diff --git a/src/sparse_blas/backends/cusparse/operations/cusparse_spmv.cpp b/src/sparse_blas/backends/cusparse/operations/cusparse_spmv.cpp
index 4acb1d1a4..0b7c47b60 100644
--- a/src/sparse_blas/backends/cusparse/operations/cusparse_spmv.cpp
+++ b/src/sparse_blas/backends/cusparse/operations/cusparse_spmv.cpp
@@ -124,9 +124,8 @@ inline void common_spmv_optimize(oneapi::mkl::transpose opA, bool is_alpha_host_
     check_valid_spmv(__func__, opA, A_view, A_handle, x_handle, y_handle, is_alpha_host_accessible,
                      is_beta_host_accessible);
     if (!spmv_descr->buffer_size_called) {
-        throw mkl::uninitialized(
-            "sparse_blas", __func__,
-            "spmv_buffer_size must be called with the same arguments before spmv_optimize.");
+        throw mkl::uninitialized("sparse_blas", __func__,
+                                 "spmv_buffer_size must be called before spmv_optimize.");
     }
     spmv_descr->optimized_called = true;
     spmv_descr->last_optimized_opA = opA;
@@ -258,9 +257,8 @@ sycl::event spmv(sycl::queue &queue, oneapi::mkl::transpose opA, const void *alp
     }
 
     if (!spmv_descr->optimized_called) {
-        throw mkl::uninitialized(
-            "sparse_blas", __func__,
-            "spmv_optimize must be called with the same arguments before spmv.");
+        throw mkl::uninitialized("sparse_blas", __func__,
+                                 "spmv_optimize must be called before spmv.");
     }
     CHECK_DESCR_MATCH(spmv_descr, opA, "spmv_optimize");
     CHECK_DESCR_MATCH(spmv_descr, A_view, "spmv_optimize");
diff --git a/src/sparse_blas/backends/cusparse/operations/cusparse_spsv.cpp b/src/sparse_blas/backends/cusparse/operations/cusparse_spsv.cpp
index 73e6f0b7c..ee1ac3547 100644
--- a/src/sparse_blas/backends/cusparse/operations/cusparse_spsv.cpp
+++ b/src/sparse_blas/backends/cusparse/operations/cusparse_spsv.cpp
@@ -110,9 +110,8 @@ inline void common_spsv_optimize(oneapi::mkl::transpose opA, bool is_alpha_host_
     detail::check_valid_spsv_common(__func__, A_view, A_handle, x_handle, y_handle,
                                     is_alpha_host_accessible);
     if (!spsv_descr->buffer_size_called) {
-        throw mkl::uninitialized(
-            "sparse_blas", __func__,
-            "spsv_buffer_size must be called with the same arguments before spsv_optimize.");
+        throw mkl::uninitialized("sparse_blas", __func__,
+                                 "spsv_buffer_size must be called before spsv_optimize.");
     }
     spsv_descr->optimized_called = true;
     spsv_descr->last_optimized_opA = opA;
@@ -228,9 +227,8 @@ sycl::event spsv(sycl::queue &queue, oneapi::mkl::transpose opA, const void *alp
     }
 
     if (!spsv_descr->optimized_called) {
-        throw mkl::uninitialized(
-            "sparse_blas", __func__,
-            "spsv_optimize must be called with the same arguments before spsv.");
+        throw mkl::uninitialized("sparse_blas", __func__,
+                                 "spsv_optimize must be called before spsv.");
     }
     CHECK_DESCR_MATCH(spsv_descr, opA, "spsv_optimize");
     CHECK_DESCR_MATCH(spsv_descr, A_view, "spsv_optimize");
diff --git a/src/sparse_blas/backends/mkl_common/mkl_spmm.cxx b/src/sparse_blas/backends/mkl_common/mkl_spmm.cxx
index 886744534..d4ad3f743 100644
--- a/src/sparse_blas/backends/mkl_common/mkl_spmm.cxx
+++ b/src/sparse_blas/backends/mkl_common/mkl_spmm.cxx
@@ -97,9 +97,8 @@ inline void common_spmm_optimize(
     check_valid_spmm(__func__, opA, A_view, A_handle, B_handle, C_handle, is_alpha_host_accessible,
                      is_beta_host_accessible);
     if (!spmm_descr->buffer_size_called) {
-        throw mkl::uninitialized(
-            "sparse_blas", __func__,
-            "spmm_buffer_size must be called with the same arguments before spmm_optimize.");
+        throw mkl::uninitialized("sparse_blas", __func__,
+                                 "spmm_buffer_size must be called before spmm_optimize.");
     }
     spmm_descr->optimized_called = true;
     spmm_descr->last_optimized_opA = opA;
@@ -200,9 +199,8 @@ sycl::event spmm(sycl::queue &queue, oneapi::mkl::transpose opA, oneapi::mkl::tr
                      is_beta_host_accessible);
 
     if (!spmm_descr->optimized_called) {
-        throw mkl::uninitialized(
-            "sparse_blas", __func__,
-            "spmm_optimize must be called with the same arguments before spmm.");
+        throw mkl::uninitialized("sparse_blas", __func__,
+                                 "spmm_optimize must be called before spmm.");
     }
     CHECK_DESCR_MATCH(spmm_descr, opA, "spmm_optimize");
     CHECK_DESCR_MATCH(spmm_descr, opB, "spmm_optimize");
diff --git a/src/sparse_blas/backends/mkl_common/mkl_spmv.cxx b/src/sparse_blas/backends/mkl_common/mkl_spmv.cxx
index a705f3481..8fa501b4b 100644
--- a/src/sparse_blas/backends/mkl_common/mkl_spmv.cxx
+++ b/src/sparse_blas/backends/mkl_common/mkl_spmv.cxx
@@ -88,12 +88,11 @@ inline void common_spmv_optimize(sycl::queue &queue, oneapi::mkl::transpose opA,
                                  oneapi::mkl::sparse::spmv_descr_t spmv_descr) {
     bool is_alpha_host_accessible = detail::is_ptr_accessible_on_host(queue, alpha);
     bool is_beta_host_accessible = detail::is_ptr_accessible_on_host(queue, beta);
-    check_valid_spmv(__func__, opA, A_view, A_handle, x_handle, y_handle,
-                     is_alpha_host_accessible, is_beta_host_accessible);
+    check_valid_spmv(__func__, opA, A_view, A_handle, x_handle, y_handle, is_alpha_host_accessible,
+                     is_beta_host_accessible);
     if (!spmv_descr->buffer_size_called) {
-        throw mkl::uninitialized(
-            "sparse_blas", __func__,
-            "spmv_buffer_size must be called with the same arguments before spmv_optimize.");
+        throw mkl::uninitialized("sparse_blas", __func__,
+                                 "spmv_buffer_size must be called before spmv_optimize.");
     }
     spmv_descr->optimized_called = true;
     spmv_descr->last_optimized_opA = opA;
@@ -120,11 +119,10 @@ void spmv_optimize(sycl::queue &queue, oneapi::mkl::transpose opA, const void *a
     if (alg == oneapi::mkl::sparse::spmv_alg::no_optimize_alg) {
         return;
     }
-    sycl::event event;
     internal_A_handle->can_be_reset = false;
     if (A_view.type_view == matrix_descr::triangular) {
-        event = oneapi::mkl::sparse::optimize_trmv(queue, A_view.uplo_view, opA, A_view.diag_view,
-                                                   internal_A_handle->backend_handle);
+        oneapi::mkl::sparse::optimize_trmv(queue, A_view.uplo_view, opA, A_view.diag_view,
+                                           internal_A_handle->backend_handle);
     }
     else if (A_view.type_view == matrix_descr::symmetric ||
              A_view.type_view == matrix_descr::hermitian) {
@@ -132,10 +130,8 @@ void spmv_optimize(sycl::queue &queue, oneapi::mkl::transpose opA, const void *a
         return;
     }
     else {
-        event = oneapi::mkl::sparse::optimize_gemv(queue, opA, internal_A_handle->backend_handle);
+        oneapi::mkl::sparse::optimize_gemv(queue, opA, internal_A_handle->backend_handle);
     }
-    // spmv_optimize is not asynchronous for buffers as the backend optimize functions don't take buffers.
-    event.wait_and_throw();
 }
 
 sycl::event spmv_optimize(sycl::queue &queue, oneapi::mkl::transpose opA, const void *alpha,
@@ -235,13 +231,12 @@ sycl::event spmv(sycl::queue &queue, oneapi::mkl::transpose opA, const void *alp
                  const std::vector<sycl::event> &dependencies) {
     bool is_alpha_host_accessible = detail::is_ptr_accessible_on_host(queue, alpha);
     bool is_beta_host_accessible = detail::is_ptr_accessible_on_host(queue, beta);
-    check_valid_spmv(__func__, opA, A_view, A_handle, x_handle, y_handle,
-                     is_alpha_host_accessible, is_beta_host_accessible);
+    check_valid_spmv(__func__, opA, A_view, A_handle, x_handle, y_handle, is_alpha_host_accessible,
+                     is_beta_host_accessible);
 
     if (!spmv_descr->optimized_called) {
-        throw mkl::uninitialized(
-            "sparse_blas", __func__,
-            "spmv_optimize must be called with the same arguments before spmv.");
+        throw mkl::uninitialized("sparse_blas", __func__,
+                                 "spmv_optimize must be called before spmv.");
     }
     CHECK_DESCR_MATCH(spmv_descr, opA, "spmv_optimize");
     CHECK_DESCR_MATCH(spmv_descr, A_view, "spmv_optimize");
diff --git a/src/sparse_blas/backends/mkl_common/mkl_spsv.cxx b/src/sparse_blas/backends/mkl_common/mkl_spsv.cxx
index e34c85957..473d9d996 100644
--- a/src/sparse_blas/backends/mkl_common/mkl_spsv.cxx
+++ b/src/sparse_blas/backends/mkl_common/mkl_spsv.cxx
@@ -99,9 +99,8 @@ inline void common_spsv_optimize(sycl::queue &queue, oneapi::mkl::transpose opA,
     check_valid_spsv(__func__, opA, A_view, A_handle, x_handle, y_handle, is_alpha_host_accessible,
                      alg);
     if (!spsv_descr->buffer_size_called) {
-        throw mkl::uninitialized(
-            "sparse_blas", __func__,
-            "spsv_buffer_size must be called with the same arguments before spsv_optimize.");
+        throw mkl::uninitialized("sparse_blas", __func__,
+                                 "spsv_buffer_size must be called before spsv_optimize.");
     }
     spsv_descr->optimized_called = true;
     spsv_descr->last_optimized_opA = opA;
@@ -128,10 +127,8 @@ void spsv_optimize(sycl::queue &queue, oneapi::mkl::transpose opA, const void *a
         return;
     }
     internal_A_handle->can_be_reset = false;
-    auto event = oneapi::mkl::sparse::optimize_trsv(queue, A_view.uplo_view, opA, A_view.diag_view,
-                                                    internal_A_handle->backend_handle);
-    // spsv_optimize is not asynchronous for buffers as the backend optimize functions don't take buffers.
-    event.wait_and_throw();
+    oneapi::mkl::sparse::optimize_trsv(queue, A_view.uplo_view, opA, A_view.diag_view,
+                                       internal_A_handle->backend_handle);
 }
 
 sycl::event spsv_optimize(sycl::queue &queue, oneapi::mkl::transpose opA, const void *alpha,
@@ -196,9 +193,8 @@ sycl::event spsv(sycl::queue &queue, oneapi::mkl::transpose opA, const void *alp
                      alg);
 
     if (!spsv_descr->optimized_called) {
-        throw mkl::uninitialized(
-            "sparse_blas", __func__,
-            "spsv_optimize must be called with the same arguments before spsv.");
+        throw mkl::uninitialized("sparse_blas", __func__,
+                                 "spsv_optimize must be called before spsv.");
     }
     CHECK_DESCR_MATCH(spsv_descr, opA, "spsv_optimize");
     CHECK_DESCR_MATCH(spsv_descr, A_view, "spsv_optimize");
diff --git a/src/sparse_blas/backends/mklcpu/mklcpu_operations.cpp b/src/sparse_blas/backends/mklcpu/mklcpu_operations.cpp
index d4ebbb886..ebc8ceecf 100644
--- a/src/sparse_blas/backends/mklcpu/mklcpu_operations.cpp
+++ b/src/sparse_blas/backends/mklcpu/mklcpu_operations.cpp
@@ -17,8 +17,8 @@
 *
 **************************************************************************/
 
-#include "sparse_blas/backends/mkl_common/mkl_handles.hpp"
 #include "sparse_blas/backends/mkl_common/mkl_dispatch.hpp"
+#include "sparse_blas/backends/mkl_common/mkl_handles.hpp"
 #include "sparse_blas/common_op_verification.hpp"
 #include "sparse_blas/macros.hpp"
 #include "sparse_blas/matrix_view_comparison.hpp"
diff --git a/src/sparse_blas/backends/mklgpu/mklgpu_handles.cpp b/src/sparse_blas/backends/mklgpu/mklgpu_handles.cpp
index 7809b2048..648fed66e 100644
--- a/src/sparse_blas/backends/mklgpu/mklgpu_handles.cpp
+++ b/src/sparse_blas/backends/mklgpu/mklgpu_handles.cpp
@@ -19,8 +19,8 @@
 
 #include "oneapi/mkl/sparse_blas/detail/mklgpu/onemkl_sparse_blas_mklgpu.hpp"
 
-#include "sparse_blas/backends/mkl_common/mkl_handles.hpp"
 #include "sparse_blas/backends/mkl_common/mkl_dispatch.hpp"
+#include "sparse_blas/backends/mkl_common/mkl_handles.hpp"
 
 namespace oneapi::mkl::sparse::mklgpu {
 
diff --git a/src/sparse_blas/backends/mklgpu/mklgpu_operations.cpp b/src/sparse_blas/backends/mklgpu/mklgpu_operations.cpp
index 223a4565b..1102306dc 100644
--- a/src/sparse_blas/backends/mklgpu/mklgpu_operations.cpp
+++ b/src/sparse_blas/backends/mklgpu/mklgpu_operations.cpp
@@ -17,8 +17,8 @@
 *
 **************************************************************************/
 
-#include "sparse_blas/backends/mkl_common/mkl_handles.hpp"
 #include "sparse_blas/backends/mkl_common/mkl_dispatch.hpp"
+#include "sparse_blas/backends/mkl_common/mkl_handles.hpp"
 #include "sparse_blas/common_op_verification.hpp"
 #include "sparse_blas/macros.hpp"
 #include "sparse_blas/matrix_view_comparison.hpp"
diff --git a/tests/unit_tests/sparse_blas/include/test_common.hpp b/tests/unit_tests/sparse_blas/include/test_common.hpp
index de99ca6e6..a02f91789 100644
--- a/tests/unit_tests/sparse_blas/include/test_common.hpp
+++ b/tests/unit_tests/sparse_blas/include/test_common.hpp
@@ -113,15 +113,6 @@ void copy_host_to_buffer(sycl::queue queue, const std::vector<T> &src, sycl::buf
     });
 }
 
-template <typename T>
-void fill_buffer_to_0(sycl::queue queue, sycl::buffer<T, 1> dst) {
-    queue.submit([&](sycl::handler &cgh) {
-        auto dst_acc = dst.template get_access<sycl::access::mode::discard_write>(
-            cgh, sycl::range<1>(dst.size()));
-        cgh.fill(dst_acc, T(0));
-    });
-}
-
 template <typename OutT, typename XT, typename YT>
 std::pair<OutT, OutT> swap_if_cond(bool swap, XT x, YT y) {
     if (swap) {
diff --git a/tests/unit_tests/sparse_blas/source/sparse_spmm_buffer.cpp b/tests/unit_tests/sparse_blas/source/sparse_spmm_buffer.cpp
index d37089351..df6fb850b 100644
--- a/tests/unit_tests/sparse_blas/source/sparse_spmm_buffer.cpp
+++ b/tests/unit_tests/sparse_blas/source/sparse_spmm_buffer.cpp
@@ -134,7 +134,7 @@ int test_spmm(sycl::device *dev, sparse_matrix_format_t format, intType nrows_A,
                 copy_host_to_buffer(main_queue, a_host, a_buf);
             }
             nnz = reset_nnz;
-            fill_buffer_to_0(main_queue, c_buf);
+            copy_host_to_buffer(main_queue, c_ref_host, c_buf);
             set_matrix_data(main_queue, format, A_handle, nrows_A, ncols_A, nnz, index, ia_buf,
                             ja_buf, a_buf);
 
diff --git a/tests/unit_tests/sparse_blas/source/sparse_spmm_usm.cpp b/tests/unit_tests/sparse_blas/source/sparse_spmm_usm.cpp
index 03ba2468e..7d30426c4 100644
--- a/tests/unit_tests/sparse_blas/source/sparse_spmm_usm.cpp
+++ b/tests/unit_tests/sparse_blas/source/sparse_spmm_usm.cpp
@@ -157,6 +157,8 @@ int test_spmm(sycl::device *dev, sparse_matrix_format_t format, intType nrows_A,
                                       a_host.data(), reset_nnz, static_cast<std::size_t>(nrows_A));
             }
             if (reset_nnz > nnz) {
+                // Wait before freeing usm pointers
+                ev_spmm.wait_and_throw();
                 ia_usm_uptr = malloc_device_uptr<intType>(main_queue, ia_host.size());
                 ja_usm_uptr = malloc_device_uptr<intType>(main_queue, ja_host.size());
                 a_usm_uptr = malloc_device_uptr<fpType>(main_queue, a_host.size());
diff --git a/tests/unit_tests/sparse_blas/source/sparse_spmv_buffer.cpp b/tests/unit_tests/sparse_blas/source/sparse_spmv_buffer.cpp
index 602f5a3f0..e03c09ebe 100644
--- a/tests/unit_tests/sparse_blas/source/sparse_spmv_buffer.cpp
+++ b/tests/unit_tests/sparse_blas/source/sparse_spmv_buffer.cpp
@@ -123,7 +123,7 @@ int test_spmv(sycl::device *dev, sparse_matrix_format_t format, intType nrows_A,
                 copy_host_to_buffer(main_queue, ja_host, ja_buf);
                 copy_host_to_buffer(main_queue, a_host, a_buf);
             }
-            fill_buffer_to_0(main_queue, y_buf);
+            copy_host_to_buffer(main_queue, y_ref_host, y_buf);
             nnz = reset_nnz;
             set_matrix_data(main_queue, format, A_handle, nrows_A, ncols_A, nnz, index, ia_buf,
                             ja_buf, a_buf);
diff --git a/tests/unit_tests/sparse_blas/source/sparse_spmv_usm.cpp b/tests/unit_tests/sparse_blas/source/sparse_spmv_usm.cpp
index 3936b13f1..eb54f6a5d 100644
--- a/tests/unit_tests/sparse_blas/source/sparse_spmv_usm.cpp
+++ b/tests/unit_tests/sparse_blas/source/sparse_spmv_usm.cpp
@@ -149,6 +149,8 @@ int test_spmv(sycl::device *dev, sparse_matrix_format_t format, intType nrows_A,
                                       a_host.data(), reset_nnz, static_cast<std::size_t>(nrows_A));
             }
             if (reset_nnz > nnz) {
+                // Wait before freeing usm pointers
+                ev_spmv.wait_and_throw();
                 ia_usm_uptr = malloc_device_uptr<intType>(main_queue, ia_host.size());
                 ja_usm_uptr = malloc_device_uptr<intType>(main_queue, ja_host.size());
                 a_usm_uptr = malloc_device_uptr<fpType>(main_queue, a_host.size());
diff --git a/tests/unit_tests/sparse_blas/source/sparse_spsv_buffer.cpp b/tests/unit_tests/sparse_blas/source/sparse_spsv_buffer.cpp
index 778439162..b64219b9a 100644
--- a/tests/unit_tests/sparse_blas/source/sparse_spsv_buffer.cpp
+++ b/tests/unit_tests/sparse_blas/source/sparse_spsv_buffer.cpp
@@ -123,7 +123,7 @@ int test_spsv(sycl::device *dev, sparse_matrix_format_t format, intType m, doubl
                 copy_host_to_buffer(main_queue, ja_host, ja_buf);
                 copy_host_to_buffer(main_queue, a_host, a_buf);
             }
-            fill_buffer_to_0(main_queue, y_buf);
+            copy_host_to_buffer(main_queue, y_ref_host, y_buf);
             nnz = reset_nnz;
             set_matrix_data(main_queue, format, A_handle, m, m, nnz, index, ia_buf, ja_buf, a_buf);
 
diff --git a/tests/unit_tests/sparse_blas/source/sparse_spsv_usm.cpp b/tests/unit_tests/sparse_blas/source/sparse_spsv_usm.cpp
index 54e496036..be427d011 100644
--- a/tests/unit_tests/sparse_blas/source/sparse_spsv_usm.cpp
+++ b/tests/unit_tests/sparse_blas/source/sparse_spsv_usm.cpp
@@ -145,6 +145,8 @@ int test_spsv(sycl::device *dev, sparse_matrix_format_t format, intType m, doubl
                                       a_host.data(), reset_nnz, mu);
             }
             if (reset_nnz > nnz) {
+                // Wait before freeing usm pointers
+                ev_spsv.wait_and_throw();
                 ia_usm_uptr = malloc_device_uptr<intType>(main_queue, ia_host.size());
                 ja_usm_uptr = malloc_device_uptr<intType>(main_queue, ja_host.size());
                 a_usm_uptr = malloc_device_uptr<fpType>(main_queue, a_host.size());