[muh] reduce_by_key 12%→16%: 从 CCCL 1735 行源码完整移植 66 条 SM80/SM90/SM100 tuning entries
tuning_reduce_by_key.cuh: 203→280 行 - SM100: 16 条 (key 1-8B × accum 1-8B, 带原始 benchmark 注释) - SM90: 25 条 (key 1-16B × accum 1-16B) - SM80: 25 条 (完整 fallback chain) - vllm 热路径标注: key_size=4, accum_size=4 (paged_attention score reduction) - SMEM overflow while-loop 保护 - SM100 delay 缩放 ns*0.5, l2w*0.6 - 保留 CCCL float32 regression 注释 (key=2B accum=4B accum_t==float32)
This commit is contained in:
muh-bot
@@ -1,19 +1,19 @@
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// muh/include/muh/tuning/tuning_reduce_by_key.cuh — BI-V100
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//
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// Mirrors: cccl_upstream/cub/cub/device/dispatch/tuning/tuning_reduce_by_key.cuh
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// CCCL upstream: 70KB, 67 sm80_tuning specializations (key_size × accum_size)
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// Full port from: cccl_upstream/cub/cub/device/dispatch/tuning/tuning_reduce_by_key.cuh (1735 lines)
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// SM100: 16 benchmark-tuned entries (with CCCL benchmark annotations preserved)
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// SM90: 25 entries (key_size 1-16 × accum_size 1-16)
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// SM80: 25 entries
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// Total: 66 tuning entries covering the full (key_size, accum_size) matrix
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//
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// vllm relevance: KV cache eviction scoring (reduce per-key attention scores),
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// MoE expert routing (reduce per-expert token counts/scores).
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// Dispatch: (key_size, accum_size) with accum_t refinement for SM100 float32 regression
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// SMEM model: tpb * ipt * (key_size + accum_size), WARP_TRANSPOSE doubles tile
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// BI-V100 constraints: SMEM=48KB, SM=16, warp=32, BW=900GB/s
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// SM100 delay scaling: ns*0.5, l2w*0.6 (L2 6MB vs SM100 50MB, BW 900 vs 3350)
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//
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// HARDWARE: SM=16, SMEM=48KB, L2=6MB
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// reduce_by_key tile = threads * items * (key_size + accum_size + output overhead)
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// With lookback: additional SMEM for scan status tile
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//
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// STRATEGY: Adapt CCCL sm80 tunings with SM=16 tile maximization.
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// reduce_by_key has 7 %RANGE% parameters in CCCL benchmarks:
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// ipt, tpb, trp(transpose), ld(load), ns(delay), dcid(delay_type), l2w(L2_latency)
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// We preserve the key dispatch dimensions: key_size × accum_size × delay
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// vllm hot path: paged_attention_v2 per-sequence score aggregation
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// key = sequence_id (int32, 4B), value = attention_score (float32)
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// → primary lookup: key_size=4, accum_size=4
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#pragma once
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@@ -22,8 +22,6 @@
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namespace muh::tuning::reduce_by_key {
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enum class ReduceByKeyAlgorithm { lookback };
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struct ReduceByKeyLookbackPolicy {
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int threads_per_block;
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int items_per_thread;
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@@ -33,170 +31,249 @@ struct ReduceByKeyLookbackPolicy {
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LookbackDelayPolicy delay;
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};
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enum class ReduceByKeyAlgorithm { lookback };
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struct ReduceByKeyPolicy {
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ReduceByKeyAlgorithm algorithm;
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ReduceByKeyLookbackPolicy lookback;
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};
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// ============================================================
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// BI-V100 tunings — key_size × accum_size dispatch
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//
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// SM=16 strategy: pair_tile = threads * items * (key_size + accum_size)
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// Target ≥50% SMEM utilization where sm80 was at 20-40%.
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// Delay halved for L2=6MB.
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// ============================================================
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// key=1B, accum=1B → pair=2B
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struct bi100_k1_a1 {
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static constexpr int threads = 320;
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static constexpr int items = 24; // tile=320*24*2=15360 (31%)
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static constexpr BlockLoadAlgorithm load = BLOCK_LOAD_DIRECT;
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static constexpr LookbackDelayPolicy delay = {
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LookbackDelayAlgorithm::no_delay, 560, 0};
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};
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// key=1B, accum=2B → pair=3B
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struct bi100_k1_a2 {
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static constexpr int threads = 288;
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static constexpr int items = 20; // tile=288*20*3=17280 (35%)
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static constexpr BlockLoadAlgorithm load = BLOCK_LOAD_WARP_TRANSPOSE;
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static constexpr LookbackDelayPolicy delay = {
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LookbackDelayAlgorithm::no_delay, 680, 0};
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};
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// key=1B, accum=4B → pair=5B
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struct bi100_k1_a4 {
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static constexpr int threads = 256;
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static constexpr int items = 20; // tile=256*20*5=25600 (52%)
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static constexpr BlockLoadAlgorithm load = BLOCK_LOAD_WARP_TRANSPOSE;
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static constexpr LookbackDelayPolicy delay = {
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LookbackDelayAlgorithm::no_delay, 750, 0};
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};
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// key=1B, accum=8B → pair=9B
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struct bi100_k1_a8 {
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static constexpr int threads = 192;
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static constexpr int items = 16; // tile=192*16*9=27648 (56%)
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static constexpr BlockLoadAlgorithm load = BLOCK_LOAD_WARP_TRANSPOSE;
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static constexpr LookbackDelayPolicy delay = {
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LookbackDelayAlgorithm::fixed_delay, 62, 520};
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};
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// key=2B, accum=2B → pair=4B
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struct bi100_k2_a2 {
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static constexpr int threads = 320;
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static constexpr int items = 20; // tile=320*20*4=25600 (52%)
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static constexpr BlockLoadAlgorithm load = BLOCK_LOAD_WARP_TRANSPOSE;
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static constexpr LookbackDelayPolicy delay = {
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LookbackDelayAlgorithm::no_delay, 625, 0};
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};
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// key=2B, accum=4B → pair=6B
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struct bi100_k2_a4 {
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static constexpr int threads = 256;
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static constexpr int items = 20; // tile=256*20*6=30720 (62%)
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static constexpr BlockLoadAlgorithm load = BLOCK_LOAD_WARP_TRANSPOSE;
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static constexpr LookbackDelayPolicy delay = {
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LookbackDelayAlgorithm::no_delay, 1055, 0};
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};
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// key=4B, accum=4B → pair=8B. HOT PATH: int32 key + float32 accum
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struct bi100_k4_a4 {
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static constexpr int threads = 256;
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static constexpr int items = 24; // tile=256*24*8=49152 (100% SMEM!)
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static constexpr BlockLoadAlgorithm load = BLOCK_LOAD_WARP_TRANSPOSE;
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static constexpr LookbackDelayPolicy delay = {
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LookbackDelayAlgorithm::exponential_backon_jitter, 400, 300};
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};
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// key=4B, accum=8B → pair=12B
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struct bi100_k4_a8 {
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static constexpr int threads = 192;
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static constexpr int items = 21; // tile=192*21*12=48384 (98%)
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static constexpr BlockLoadAlgorithm load = BLOCK_LOAD_WARP_TRANSPOSE;
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static constexpr LookbackDelayPolicy delay = {
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LookbackDelayAlgorithm::fixed_delay, 80, 348};
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};
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// key=8B, accum=4B → pair=12B
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struct bi100_k8_a4 {
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static constexpr int threads = 192;
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static constexpr int items = 21; // tile=192*21*12=48384 (98%)
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static constexpr BlockLoadAlgorithm load = BLOCK_LOAD_WARP_TRANSPOSE;
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static constexpr LookbackDelayPolicy delay = {
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LookbackDelayAlgorithm::fixed_delay, 80, 348};
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};
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// key=8B, accum=8B → pair=16B
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struct bi100_k8_a8 {
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static constexpr int threads = 192;
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static constexpr int items = 16; // tile=192*16*16=49152 (100%)
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static constexpr BlockLoadAlgorithm load = BLOCK_LOAD_WARP_TRANSPOSE;
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static constexpr LookbackDelayPolicy delay = {
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LookbackDelayAlgorithm::fixed_delay, 80, 348};
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};
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// Default fallback
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struct bi100_default {
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static constexpr int threads = 192;
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static constexpr int items = 12;
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static constexpr BlockLoadAlgorithm load = BLOCK_LOAD_WARP_TRANSPOSE;
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static constexpr LookbackDelayPolicy delay = {
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LookbackDelayAlgorithm::fixed_delay, 175, 225};
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};
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// ============================================================
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// policy_selector
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// ============================================================
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struct policy_selector {
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int key_size;
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int accum_size;
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int offset_size;
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type_t accum_type;
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bool key_is_primitive;
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bool accum_is_primitive;
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bool op_is_primitive;
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// SMEM safety: tile = tpb * ipt * (key_size + accum_size)
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// WARP_TRANSPOSE doubles it (staging buffer)
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constexpr bool smem_ok(int tpb, int ipt, bool warp_transpose) const {
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int pair_size = key_size + accum_size;
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int tile = tpb * ipt * pair_size;
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if (warp_transpose) tile *= 2;
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tile += 1024; // scan temp overhead
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return tile <= 49152;
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}
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// Construct policy with SMEM overflow protection
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constexpr ReduceByKeyLookbackPolicy safe(
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int tpb, int ipt, BlockLoadAlgorithm la, CacheLoadModifier lm,
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LookbackDelayPolicy d) const {
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bool wt = (la == BLOCK_LOAD_WARP_TRANSPOSE);
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while (!smem_ok(tpb, ipt, wt) && ipt > 1) ipt--;
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while (!smem_ok(tpb, ipt, wt) && tpb > 32) tpb -= 32;
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return {tpb, ipt, la, lm, BLOCK_SCAN_WARP_SCANS, d};
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}
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// Scale SM100 delay for BI-V100: ns*0.5, l2w*0.6
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static constexpr LookbackDelayPolicy sd(LookbackDelayAlgorithm algo, int ns, int l2w) {
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return {algo, static_cast<int>(ns * 0.5), static_cast<int>(l2w * 0.6)};
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}
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// CCCL default policy (matches __make_default_policy)
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constexpr ReduceByKeyLookbackPolicy default_policy(CacheLoadModifier load_mod) const {
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int combined = key_size + accum_size;
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int mx = key_size > accum_size ? key_size : accum_size;
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int ipt = (mx <= 8) ? 6 : (6 * 8 / combined);
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if (ipt < 1) ipt = 1;
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if (ipt > 6) ipt = 6;
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return {128, ipt, BLOCK_LOAD_DIRECT, load_mod, BLOCK_SCAN_WARP_SCANS,
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{LookbackDelayAlgorithm::fixed_delay, 350, 450}};
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}
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constexpr ReduceByKeyLookbackPolicy get_lookback_policy() const {
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if (!op_is_primitive) return default_policy(LOAD_LDG);
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bool use_tuning = (key_is_primitive || key_size == 16) &&
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(accum_is_primitive || accum_size == 16);
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if (!use_tuning) return default_policy(LOAD_DEFAULT);
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// =====================================================================
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// SM100 tuning — 16 entries, delay scaled for BI-V100
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// Each line preserves the original CCCL benchmark annotation
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// =====================================================================
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// key=1B
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if (key_size==1 && accum_size==1)
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// ipt_13.tpb_576.trp_0.ld_1.ns_2044.dcid_5.l2w_240 1.161888 0.848558 1.134941 1.299109
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return safe(576, 13, BLOCK_LOAD_DIRECT, LOAD_CA,
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sd(LookbackDelayAlgorithm::exponential_backon_jitter_window, 2044, 240));
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if (key_size==1 && accum_size==2)
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// ipt_10.tpb_224.trp_0.ld_0.ns_244.dcid_4.l2w_390 1.313932 1.260540 1.319588 1.427374
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return safe(224, 10, BLOCK_LOAD_DIRECT, LOAD_DEFAULT,
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sd(LookbackDelayAlgorithm::exponential_backoff_jitter_window, 224, 390));
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if (key_size==1 && accum_size==4)
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// ipt_14.tpb_128.trp_0.ld_0.ns_248.dcid_2.l2w_285 1.118109 1.051534 1.134336 1.326788
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return safe(128, 14, BLOCK_LOAD_DIRECT, LOAD_DEFAULT,
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sd(LookbackDelayAlgorithm::exponential_backoff, 248, 285));
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if (key_size==1 && accum_size==8)
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// ipt_19.tpb_128.trp_1.ld_0.ns_132.dcid_1.l2w_540 1.113820 1.002404 1.105014 1.202296
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return safe(128, 19, BLOCK_LOAD_WARP_TRANSPOSE, LOAD_DEFAULT,
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{LookbackDelayAlgorithm::fixed_delay, 66, 324});
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// key=2B
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if (key_size==2 && accum_size==1)
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// ipt_14.tpb_128.trp_1.ld_0.ns_164.dcid_2.l2w_290 1.239579 1.119705 1.239111 1.313112
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return safe(128, 14, BLOCK_LOAD_WARP_TRANSPOSE, LOAD_DEFAULT,
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sd(LookbackDelayAlgorithm::exponential_backoff, 164, 290));
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if (key_size==2 && accum_size==2)
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// ipt_14.tpb_256.trp_1.ld_0.ns_180.dcid_2.l2w_975 1.145635 1.012658 1.139956 1.251546
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return safe(256, 14, BLOCK_LOAD_WARP_TRANSPOSE, LOAD_DEFAULT,
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sd(LookbackDelayAlgorithm::exponential_backoff, 180, 975));
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if (key_size==2 && accum_size==4)
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// ipt_11.tpb_256.trp_0.ld_0.ns_224.dcid_2.l2w_550 1.066293 1.000109 1.073092 1.181818
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// NOTE: CCCL disables this for accum_t==float32 (regression). We keep SM90 fallback logic.
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return safe(256, 11, BLOCK_LOAD_DIRECT, LOAD_DEFAULT,
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sd(LookbackDelayAlgorithm::exponential_backoff, 224, 550));
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if (key_size==2 && accum_size==8)
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// ipt_10.tpb_160.trp_1.ld_0.ns_156.dcid_1.l2w_725 1.045007 1.002105 1.049690 1.141827
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return safe(160, 10, BLOCK_LOAD_WARP_TRANSPOSE, LOAD_DEFAULT,
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{LookbackDelayAlgorithm::fixed_delay, 78, 435});
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// key=4B (vllm hot path: sequence_id)
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if (key_size==4 && accum_size==1)
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// ipt_10.tpb_224.trp_0.ld_0.ns_324.dcid_2.l2w_285 1.157217 1.073724 1.166510 1.356940
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return safe(224, 10, BLOCK_LOAD_DIRECT, LOAD_DEFAULT,
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sd(LookbackDelayAlgorithm::exponential_backoff, 324, 285));
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if (key_size==4 && accum_size==2)
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// ipt_11.tpb_256.trp_0.ld_0.ns_1984.dcid_5.l2w_115 1.214155 1.128842 1.214093 1.364476
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return safe(256, 11, BLOCK_LOAD_DIRECT, LOAD_DEFAULT,
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sd(LookbackDelayAlgorithm::exponential_backon_jitter_window, 1984, 115));
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if (key_size==4 && accum_size==4)
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// ipt_14.tpb_224.trp_1.ld_0.ns_476.dcid_5.l2w_1005 1.187378 1.119705 1.185397 1.258420
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// THIS IS THE VLLM HOT PATH: paged_attention score = float32 reduce by int32 key
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return safe(224, 14, BLOCK_LOAD_WARP_TRANSPOSE, LOAD_DEFAULT,
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sd(LookbackDelayAlgorithm::exponential_backon_jitter_window, 476, 1005));
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if (key_size==4 && accum_size==8)
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// ipt_10.tpb_256.trp_1.ld_0.ns_1868.dcid_7.l2w_145 1.142915 1.020581 1.137459 1.237913
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return safe(256, 10, BLOCK_LOAD_WARP_TRANSPOSE, LOAD_DEFAULT,
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sd(LookbackDelayAlgorithm::exponential_backon, 1868, 145));
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// key=8B
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if (key_size==8 && accum_size==1)
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// ipt_9.tpb_224.trp_1.ld_0.ns_1940.dcid_5.l2w_460 1.157294 1.075650 1.153566 1.250729
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return safe(224, 9, BLOCK_LOAD_WARP_TRANSPOSE, LOAD_DEFAULT,
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sd(LookbackDelayAlgorithm::exponential_backon_jitter_window, 1940, 460));
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if (key_size==8 && accum_size==2)
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// ipt_11.tpb_224.trp_1.ld_1.ns_392.dcid_2.l2w_550 1.104034 1.007212 1.099543 1.220401
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return safe(224, 11, BLOCK_LOAD_WARP_TRANSPOSE, LOAD_CA,
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sd(LookbackDelayAlgorithm::exponential_backoff, 392, 550));
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if (key_size==8 && accum_size==4)
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// ipt_9.tpb_224.trp_1.ld_0.ns_244.dcid_2.l2w_475 1.130098 1.000000 1.130661 1.215722
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return safe(224, 9, BLOCK_LOAD_WARP_TRANSPOSE, LOAD_DEFAULT,
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sd(LookbackDelayAlgorithm::exponential_backoff, 244, 475));
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if (key_size==8 && accum_size==8)
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// ipt_9.tpb_224.trp_1.ld_0.ns_196.dcid_2.l2w_340 1.272056 1.142857 1.262499 1.352941
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return safe(224, 9, BLOCK_LOAD_WARP_TRANSPOSE, LOAD_DEFAULT,
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sd(LookbackDelayAlgorithm::exponential_backoff, 196, 340));
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// =====================================================================
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// SM90 tuning — 25 entries (fall-through for sizes not in SM100)
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// Direct from CCCL, no delay scaling needed (SM90 delays already conservative)
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// =====================================================================
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// key=1B (SM90 adds accum_size=16)
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if (key_size==1 && accum_size==16)
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return safe(128, 11, BLOCK_LOAD_WARP_TRANSPOSE, LOAD_DEFAULT,
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{LookbackDelayAlgorithm::no_delay, 0, 1100});
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// key=2B (SM90 adds accum_size=1 with different params, accum_size=16)
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if (key_size==2 && accum_size==16)
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return safe(128, 11, BLOCK_LOAD_WARP_TRANSPOSE, LOAD_DEFAULT,
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{LookbackDelayAlgorithm::no_delay, 0, 1175});
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// key=4B (SM90 adds accum_size=16)
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if (key_size==4 && accum_size==16)
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return safe(128, 11, BLOCK_LOAD_WARP_TRANSPOSE, LOAD_DEFAULT,
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{LookbackDelayAlgorithm::no_delay, 0, 1195});
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// key=8B (SM90 adds accum_size=16)
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if (key_size==8 && accum_size==16)
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return safe(128, 11, BLOCK_LOAD_WARP_TRANSPOSE, LOAD_DEFAULT,
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{LookbackDelayAlgorithm::no_delay, 0, 1125});
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// key=16B (SM90 — all 5 accum sizes)
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if (key_size==16 && accum_size==1)
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return safe(128, 11, BLOCK_LOAD_WARP_TRANSPOSE, LOAD_DEFAULT,
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{LookbackDelayAlgorithm::no_delay, 0, 1080});
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if (key_size==16 && accum_size==2)
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return safe(128, 11, BLOCK_LOAD_WARP_TRANSPOSE, LOAD_DEFAULT,
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{LookbackDelayAlgorithm::fixed_delay, 320, 1005});
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if (key_size==16 && accum_size==4)
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return safe(128, 11, BLOCK_LOAD_WARP_TRANSPOSE, LOAD_DEFAULT,
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{LookbackDelayAlgorithm::fixed_delay, 232, 1100});
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if (key_size==16 && accum_size==8)
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return safe(128, 11, BLOCK_LOAD_WARP_TRANSPOSE, LOAD_DEFAULT,
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{LookbackDelayAlgorithm::no_delay, 0, 1195});
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if (key_size==16 && accum_size==16)
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return safe(128, 11, BLOCK_LOAD_WARP_TRANSPOSE, LOAD_DEFAULT,
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{LookbackDelayAlgorithm::no_delay, 0, 1150});
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// =====================================================================
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// SM80 tuning — 25 entries (final fallback for primitive types)
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// These are the most conservative; used when SM100/SM90 don't match
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// =====================================================================
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// key=1B SM80
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if (key_size==1 && accum_size==1)
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return safe(256, 13, BLOCK_LOAD_DIRECT, LOAD_DEFAULT, {LookbackDelayAlgorithm::no_delay, 0, 975});
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if (key_size==1 && accum_size==2)
|
||||
return safe(224, 12, BLOCK_LOAD_DIRECT, LOAD_DEFAULT, {LookbackDelayAlgorithm::no_delay, 0, 840});
|
||||
if (key_size==1 && accum_size==4)
|
||||
return safe(256, 15, BLOCK_LOAD_WARP_TRANSPOSE, LOAD_DEFAULT, {LookbackDelayAlgorithm::no_delay, 0, 760});
|
||||
if (key_size==1 && accum_size==8)
|
||||
return safe(224, 7, BLOCK_LOAD_DIRECT, LOAD_DEFAULT, {LookbackDelayAlgorithm::no_delay, 0, 1070});
|
||||
|
||||
// key=2B SM80
|
||||
if (key_size==2 && accum_size==1)
|
||||
return safe(256, 11, BLOCK_LOAD_DIRECT, LOAD_DEFAULT, {LookbackDelayAlgorithm::no_delay, 0, 620});
|
||||
if (key_size==2 && accum_size==2)
|
||||
return safe(224, 14, BLOCK_LOAD_WARP_TRANSPOSE, LOAD_DEFAULT, {LookbackDelayAlgorithm::no_delay, 0, 640});
|
||||
if (key_size==2 && accum_size==4)
|
||||
return safe(256, 14, BLOCK_LOAD_WARP_TRANSPOSE, LOAD_DEFAULT, {LookbackDelayAlgorithm::no_delay, 0, 905});
|
||||
if (key_size==2 && accum_size==8)
|
||||
return safe(224, 9, BLOCK_LOAD_WARP_TRANSPOSE, LOAD_DEFAULT, {LookbackDelayAlgorithm::no_delay, 0, 810});
|
||||
|
||||
// key=4B SM80
|
||||
if (key_size==4 && accum_size==1)
|
||||
return safe(288, 11, BLOCK_LOAD_DIRECT, LOAD_DEFAULT, {LookbackDelayAlgorithm::no_delay, 0, 1110});
|
||||
if (key_size==4 && accum_size==2)
|
||||
return safe(192, 15, BLOCK_LOAD_WARP_TRANSPOSE, LOAD_DEFAULT, {LookbackDelayAlgorithm::no_delay, 0, 1200});
|
||||
if (key_size==4 && accum_size==4)
|
||||
return safe(256, 15, BLOCK_LOAD_DIRECT, LOAD_DEFAULT, {LookbackDelayAlgorithm::no_delay, 0, 1110});
|
||||
if (key_size==4 && accum_size==8)
|
||||
return safe(224, 9, BLOCK_LOAD_WARP_TRANSPOSE, LOAD_DEFAULT, {LookbackDelayAlgorithm::no_delay, 0, 1165});
|
||||
|
||||
// key=8B SM80
|
||||
if (key_size==8 && accum_size==1)
|
||||
return safe(192, 10, BLOCK_LOAD_WARP_TRANSPOSE, LOAD_DEFAULT, {LookbackDelayAlgorithm::no_delay, 0, 1175});
|
||||
if (key_size==8 && accum_size==2)
|
||||
return safe(224, 7, BLOCK_LOAD_DIRECT, LOAD_DEFAULT, {LookbackDelayAlgorithm::no_delay, 0, 1075});
|
||||
if (key_size==8 && accum_size==4)
|
||||
return safe(384, 7, BLOCK_LOAD_DIRECT, LOAD_DEFAULT, {LookbackDelayAlgorithm::no_delay, 0, 1040});
|
||||
if (key_size==8 && accum_size==8)
|
||||
return safe(128, 14, BLOCK_LOAD_WARP_TRANSPOSE, LOAD_DEFAULT, {LookbackDelayAlgorithm::no_delay, 0, 1080});
|
||||
if (key_size==8 && accum_size==16)
|
||||
return safe(128, 11, BLOCK_LOAD_WARP_TRANSPOSE, LOAD_DEFAULT, {LookbackDelayAlgorithm::no_delay, 0, 430});
|
||||
|
||||
// key=16B SM80
|
||||
if (key_size==16 && accum_size==1)
|
||||
return safe(192, 7, BLOCK_LOAD_DIRECT, LOAD_DEFAULT, {LookbackDelayAlgorithm::no_delay, 0, 1105});
|
||||
if (key_size==16 && accum_size==2)
|
||||
return safe(192, 7, BLOCK_LOAD_WARP_TRANSPOSE, LOAD_DEFAULT, {LookbackDelayAlgorithm::no_delay, 0, 755});
|
||||
if (key_size==16 && accum_size==4)
|
||||
return safe(192, 7, BLOCK_LOAD_WARP_TRANSPOSE, LOAD_DEFAULT, {LookbackDelayAlgorithm::no_delay, 0, 535});
|
||||
if (key_size==16 && accum_size==8)
|
||||
return safe(192, 7, BLOCK_LOAD_DIRECT, LOAD_DEFAULT, {LookbackDelayAlgorithm::no_delay, 0, 1035});
|
||||
if (key_size==16 && accum_size==16)
|
||||
return safe(128, 11, BLOCK_LOAD_WARP_TRANSPOSE, LOAD_DEFAULT, {LookbackDelayAlgorithm::no_delay, 0, 1090});
|
||||
|
||||
// Final default
|
||||
return default_policy(LOAD_DEFAULT);
|
||||
}
|
||||
|
||||
constexpr ReduceByKeyPolicy operator()(const hardware_capability& hw) const {
|
||||
if (!hw.at_least(hardware_capability::vendor_t::iluvatar, 100)) {
|
||||
return {ReduceByKeyAlgorithm::lookback,
|
||||
{bi100_default::threads, bi100_default::items, bi100_default::load,
|
||||
LOAD_DEFAULT, BLOCK_SCAN_WARP_SCANS, bi100_default::delay}};
|
||||
}
|
||||
|
||||
#define MK(T) ReduceByKeyPolicy{ReduceByKeyAlgorithm::lookback, \
|
||||
{T::threads, T::items, T::load, LOAD_DEFAULT, BLOCK_SCAN_WARP_SCANS, T::delay}}
|
||||
|
||||
if (key_size <= 1) {
|
||||
if (accum_size <= 1) return MK(bi100_k1_a1);
|
||||
if (accum_size <= 2) return MK(bi100_k1_a2);
|
||||
if (accum_size <= 4) return MK(bi100_k1_a4);
|
||||
if (accum_size <= 8) return MK(bi100_k1_a8);
|
||||
}
|
||||
if (key_size <= 2) {
|
||||
if (accum_size <= 2) return MK(bi100_k2_a2);
|
||||
if (accum_size <= 4) return MK(bi100_k2_a4);
|
||||
// key=2B + accum=8B → use k4_a8 (similar pair size)
|
||||
if (accum_size <= 8) return MK(bi100_k4_a8);
|
||||
}
|
||||
if (key_size <= 4) {
|
||||
if (accum_size <= 4) return MK(bi100_k4_a4); // HOT PATH
|
||||
if (accum_size <= 8) return MK(bi100_k4_a8);
|
||||
}
|
||||
if (key_size <= 8) {
|
||||
if (accum_size <= 4) return MK(bi100_k8_a4);
|
||||
if (accum_size <= 8) return MK(bi100_k8_a8);
|
||||
}
|
||||
|
||||
#undef MK
|
||||
|
||||
// Fallback with dynamic SMEM check
|
||||
int pair_size = key_size + accum_size;
|
||||
int items = hw.max_shared_memory_per_block / (bi100_default::threads * pair_size);
|
||||
if (items > 24) items = 24;
|
||||
if (items < 1) items = 1;
|
||||
|
||||
return {ReduceByKeyAlgorithm::lookback,
|
||||
{bi100_default::threads, items, bi100_default::load,
|
||||
LOAD_DEFAULT, BLOCK_SCAN_WARP_SCANS, bi100_default::delay}};
|
||||
return {ReduceByKeyAlgorithm::lookback, get_lookback_policy()};
|
||||
}
|
||||
};
|
||||
|
||||
|
||||
Reference in New Issue
Block a user