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CANN: add RoPE cache preload before ACL graph capture (#20747)

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ACL graph capture disallows host-to-device memcpy and device memory
malloc/free on the captured stream. Pre-load the RoPE cache before
capture so that:
- Host-to-device copies and allocations run on the non-captured stream
- Cache metadata is populated and memory pool is warmed up
- During capture, only on-device computations are recorded; host-side
  and allocation branches are skipped
This commit is contained in:
Chenguang Li
2026-03-23 15:24:06 +08:00
committed by GitHub
parent cc18f965b6
commit 07ff000551
4 changed files with 81 additions and 1 deletions
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ggml/src/ggml-cann/aclnn_ops.cpp
+52
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@@ -3011,6 +3011,58 @@ void ggml_cann_rope(ggml_backend_cann_context & ctx, ggml_tensor * dst) {
}
}
void ggml_cann_rope_cache_preload(ggml_backend_cann_context & ctx, ggml_tensor * dst) {
ggml_tensor * src0 = dst->src[0];
float freq_base, freq_scale, ext_factor, attn_factor, beta_fast, beta_slow;
int sections[4];
const int n_dims = ((int32_t *) dst->op_params)[1];
const int mode = ((int32_t *) dst->op_params)[2];
const int n_ctx_orig = ((int32_t *) dst->op_params)[4];
GGML_TENSOR_UNARY_OP_LOCALS
memcpy(&freq_base, (int32_t *) dst->op_params + 5, sizeof(float));
memcpy(&freq_scale, (int32_t *) dst->op_params + 6, sizeof(float));
memcpy(&ext_factor, (int32_t *) dst->op_params + 7, sizeof(float));
memcpy(&attn_factor, (int32_t *) dst->op_params + 8, sizeof(float));
memcpy(&beta_fast, (int32_t *) dst->op_params + 9, sizeof(float));
memcpy(&beta_slow, (int32_t *) dst->op_params + 10, sizeof(float));
memcpy(&sections, (int32_t *) dst->op_params + 11, sizeof(int) * 4);
const float theta_scale = powf(freq_base, -2.0f / n_dims);
float corr_dims[2];
ggml_rope_yarn_corr_dims(n_dims, n_ctx_orig, freq_base, beta_fast, beta_slow, corr_dims);
bool is_neox = mode & GGML_ROPE_TYPE_NEOX;
const bool is_imrope = mode == GGML_ROPE_TYPE_IMROPE;
const bool mrope_used = mode & GGML_ROPE_TYPE_MROPE;
const bool is_vision = mode == GGML_ROPE_TYPE_VISION;
if (is_imrope || mrope_used) {
is_neox = true;
}
int64_t rope_dims = n_dims;
if (is_vision) {
rope_dims = src0->ne[0];
}
// Run the full cache init on the non-captured stream. This performs all
// host-to-device memcpy, aclrtMalloc/Free, and on-device computations
// so that the memory pool is warmed up and cache metadata is populated.
aclnn_rope_cache_init(ctx, dst, corr_dims, ext_factor, theta_scale, freq_scale, attn_factor, is_neox, sections,
mrope_used, is_imrope, is_vision, rope_dims);
// Reset `cached` so that during graph capture the on-device computations
// (sin/cos, position multiply, repeat, etc.) still execute and get recorded
// into the captured graph. The cache metadata (theta_scale_length,
// theta_scale, sections, position_length, etc.) remains set, which causes
// all host-to-device copy and malloc/free branches to be skipped.
ctx.rope_cache.cached = false;
}
void ggml_cann_argmax(ggml_backend_cann_context & ctx, ggml_tensor * dst) {
ggml_tensor * src0 = dst->src[0];