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llama.cpp
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ggml-alloc : fix reuse-parent logic for misaligned sizes (#17884)

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Georgi Gerganov 2025-12-11 14:30:10 +02:00 committed by GitHub
parent d9f8f60618
commit c6f6e4f96a
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1 changed files with 15 additions and 13 deletions
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28
ggml/src/ggml-alloc.c
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@ -312,16 +312,9 @@ static struct buffer_address ggml_dyn_tallocr_alloc(struct ggml_dyn_tallocr * al
}
// this is a very naive implementation, but for our case the number of free blocks should be very small
static void ggml_dyn_tallocr_free_tensor(struct ggml_dyn_tallocr * alloc, struct buffer_address addr, size_t size, const struct ggml_tensor * tensor) {
static void ggml_dyn_tallocr_free_bytes(struct ggml_dyn_tallocr * alloc, struct buffer_address addr, size_t size) {
size = aligned_offset(NULL, size, alloc->alignment);
AT_PRINTF("%s: freeing %s at {chunk=%d, offset=%zu} (%zu bytes) - n_free_blocks = %d\n",
__func__, tensor->name, addr.chunk, addr.offset, size, alloc->chunks[addr.chunk]->n_free_blocks);
#ifdef GGML_ALLOCATOR_DEBUG
remove_allocated_tensor(alloc, addr, tensor);
#endif
struct tallocr_chunk * chunk = alloc->chunks[addr.chunk];
// see if we can merge with an existing block
@ -357,8 +350,6 @@ static void ggml_dyn_tallocr_free_tensor(struct ggml_dyn_tallocr * alloc, struct
}
// otherwise, add a new block
ggml_dyn_tallocr_insert_block(chunk, addr.offset, size);
GGML_UNUSED(tensor);
}
static void ggml_dyn_tallocr_reset(struct ggml_dyn_tallocr * alloc) {
@ -616,13 +607,17 @@ static void ggml_gallocr_free_extra_space(ggml_gallocr_t galloc, struct ggml_ten
GGML_ASSERT(parent_size >= node_size);
// note: we want after the freeing the chunks to continue to be aligned
struct ggml_dyn_tallocr * p_alloc = galloc->buf_tallocs[p_hn->buffer_id];
parent_size = aligned_offset(NULL, parent_size, p_alloc->alignment);
node_size = aligned_offset(NULL, node_size, p_alloc->alignment);
if (parent_size > node_size) {
struct ggml_dyn_tallocr * p_alloc = galloc->buf_tallocs[p_hn->buffer_id];
struct buffer_address p_addr = p_hn->addr;
p_addr.offset += node_size;
size_t extra_size = parent_size - node_size;
AT_PRINTF("freeing extra %zu bytes from parent %s for %s\n", extra_size, parent->name, node->name);
ggml_dyn_tallocr_free_tensor(p_alloc, p_addr, extra_size, parent);
ggml_dyn_tallocr_free_bytes(p_alloc, p_addr, extra_size);
}
}
@ -706,7 +701,14 @@ static void ggml_gallocr_free_node(ggml_gallocr_t galloc, struct ggml_tensor * n
struct ggml_dyn_tallocr * alloc = galloc->buf_tallocs[buffer_id];
ggml_backend_buffer_type_t buft = galloc->bufts[buffer_id];
size_t size = ggml_backend_buft_get_alloc_size(buft, node);
ggml_dyn_tallocr_free_tensor(alloc, hn->addr, size, node);
AT_PRINTF("%s: freeing %s at {chunk=%d, offset=%zu} (%zu bytes) - n_free_blocks = %d\n",
__func__, node->name, hn->addr.chunk, hn->addr.offset, size, alloc->chunks[hn->addr.chunk]->n_free_blocks);
#ifdef GGML_ALLOCATOR_DEBUG
remove_allocated_tensor(alloc, hn->addr, node);
#endif
ggml_dyn_tallocr_free_bytes(alloc, hn->addr, size);
hn->allocated = false;
}