Visible to Intel only — GUID: GUID-90AB51ED-0AF5-499B-87CF-FD1FCB418AEF
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DPCT1087 [UPDATE]
Message
Detailed Help
Suggestions to Fix
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Visible to Intel only — GUID: GUID-90AB51ED-0AF5-499B-87CF-FD1FCB418AEF
DPCT1087 [UPDATE]
Message
SYCL currently does not support cross group synchronization. You can specify --use-experimental-features=root-group to use the root-group to migrate <synchronization API call>.
Detailed Help
By default, the SYCL root group extension is not used to migrate CUDA* grid level synchronization. To use root-group to migrate CUDA grid level synchronization, specify --use-experimental-features=root-group in the migration command.
Suggestions to Fix
Specify --use-experimental-features= root-group in the migration command to use the root-group to migrate CUDA grid level synchronization.
For example, this original CUDA* code:
__global__ void kernel() {
namespace cg = cooperative_groups;
cg::grid_group grid = cg::this_grid();
grid.sync();
}
void foo() {
kernel<<<1, 64>>>();
}results in the following migrated SYCL code:
void kernel() {
/*
DPCT1119:1: Migration of cooperative_groups::__v1::grid_group::this_grid is not
supported, please try to remigrate with option:
--use-experimental-features=root-group.
*/
/*
DPCT1119:2: Migration of cooperative_groups::__v1::grid_group is not
supported, please try to remigrate with option:
--use-experimental-features=root-group.
*/
cg::grid_group grid = cg::this_grid();
/*
DPCT1087:0: SYCL currently does not support cross group synchronization. You
can specify "--use-experimental-features=root-group" to use the dpct
helper function nd_range_barrier to migrate grid.sync().
*/
grid.sync();
}
void foo() {
dpct::get_in_order_queue().parallel_for(
sycl::nd_range<3>(sycl::range<3>(1, 1, 64), sycl::range<3>(1, 1, 64)),
[=](sycl::nd_item<3> item_ct1) {
kernel();
});
}which is rewritten to:
void kernel(const sycl::nd_item<3> &item_ct1,
sycl::ext::oneapi::experimental::root_group grid =
item_ct1.ext_oneapi_get_root_group();
sycl::group_barrier(grid);
}
void foo() {
auto exp_props = sycl::ext::oneapi::experimental::properties{
sycl::ext::oneapi::experimental::use_root_sync};
dpct::get_in_order_queue().parallel_for(
sycl::nd_range<3>(sycl::range<3>(1, 1, 64), sycl::range<3>(1, 1, 64)),
exp_props, [=](sycl::nd_item<3> item_ct1) {
kernel(item_ct1);
[=](sycl::nd_item<3> item_ct1) {
});
}