[GitHub] [tvm] mbrookhart commented on a change in pull request #7233: [TOPI] Minor perf improvement for GPU scatter

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mbrookhart commented on a change in pull request #7233:
URL: https://github.com/apache/tvm/pull/7233#discussion_r554201277



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File path: python/tvm/topi/cuda/scatter.py
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@@ -312,19 +313,18 @@ def gen_ir_4d(data, indices, updates, axis, out, update_func):
     out_ptr = ib.buffer_ptr(out)
     data_ptr = ib.buffer_ptr(data)
     with ib.new_scope():
-        i = te.thread_axis("blockIdx.x")
-        ib.scope_attr(i, "thread_extent", n)
-        j = te.thread_axis("blockIdx.y")
-        ib.scope_attr(j, "thread_extent", c)
-        k = te.thread_axis("blockIdx.z")
-        ib.scope_attr(k, "thread_extent", h)
+        fused = n * c * h * w
+        num_thread = int(tvm.target.Target.current(allow_none=False).max_num_threads)
+        num_blocks = ceil_div(fused, num_thread)

Review comment:
       :) I didn't think of this as an option when I did the scatter kernel, this was my first GPU kernel. Can we make this change on the other dimensions as well?




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