[Kernel][Performance] Tweak MoE Batched silu_mul_fp8_quant_deep_gemm kernel (vllm-project#21193)

Signed-off-by: Varun Sundar Rabindranath <vsundarr@redhat.com>
Co-authored-by: Varun Sundar Rabindranath <vsundarr@redhat.com>
Signed-off-by: Diego-Castan <diego.castan@ibm.com>

Author: varun-sundar-rabindranath

vllm/model_executor/layers/fused_moe/batched_deep_gemm_moe.py

@@ -55,6 +55,7 @@ def _silu_mul_fp8_quant_deep_gemm(
 
     # Meta ---------------------------------------------------------------
     BLOCK: tl.constexpr,
+    NUM_STAGES: tl.constexpr,
 ):
     G = H // GROUP_SIZE
 
@@ -73,8 +74,7 @@ def _silu_mul_fp8_quant_deep_gemm(
     cols = cols.to(tl.int64)
     mask_h = cols < BLOCK
 
-    t = tl.zeros([], tl.int64)
-    while t < n_tokens:
+    for t in tl.range(0, n_tokens, num_stages=NUM_STAGES):
         base_i_offset = (e * stride_i_e + t * stride_i_t +
                          g * GROUP_SIZE * stride_i_h)
         base_yq_offset = (e * stride_yq_e + t * stride_yq_t +
@@ -102,8 +102,6 @@ def _silu_mul_fp8_quant_deep_gemm(
         tl.store(y_q_ptr + base_yq_offset + cols * stride_yq_h, y_q, mask=mask)
         tl.store(y_s_ptr + base_ys_offset, y_s)
 
-        t += 1
-
 
 def silu_mul_fp8_quant_deep_gemm(
     y: torch.Tensor,  # (E, T, 2*H) float32
@@ -180,7 +178,8 @@ def silu_mul_fp8_quant_deep_gemm(
         fp8_max,
         is_blackwell_deep_gemm_used(),
         BLOCK=group_size,
-        num_warps=4,
+        NUM_STAGES=8,
+        num_warps=1,
     )
 
     return y_q, y_s