t-vi commented on a change in pull request #4342: Add workgroup size attribute
to AMDGPU functions in codegen
URL: https://github.com/apache/incubator-tvm/pull/4342#discussion_r346690529
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File path: src/codegen/llvm/codegen_amdgpu.cc
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@@ -36,13 +36,39 @@
namespace tvm {
namespace codegen {
+namespace {
+
+// calls the device api to get the max threads per block
+static inline int DetectROCMmaxThreadsPerBlock() {
+ TVMContext tvm_ctx;
+ tvm_ctx.device_type = kDLROCM;
+ tvm_ctx.device_id = 0;
+ tvm::runtime::DeviceAPI* api = tvm::runtime::DeviceAPI::Get(tvm_ctx, true);
+ if (api != nullptr) {
+ TVMRetValue val;
+ api->GetAttr(tvm_ctx, tvm::runtime::kExist, &val);
+ if (val.operator int() == 1) {
+ tvm::runtime::DeviceAPI::Get(tvm_ctx)->
+ GetAttr(tvm_ctx, tvm::runtime::kMaxThreadsPerBlock, &val);
+ return val.operator int();
+ }
+ }
+ LOG(WARNING) << "Cannot get maximum number of threads for AMD codegen";
+ return 1024;
Review comment:
OK, so I always had the trouble only when I didn't set workgroup size on
compilation (which is what this patch fixes by setting the max workgroup size)
and then used many threads on launch, but I've changed the default here based
on your expertise.
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