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ggml-alloc : use virtual memory for measurement (#2973)
* ggml-alloc : use virtual memory for measurement * compatibility fixes for MAP_ANONYMOUS * fallback to fixed address for systems without virtual memory
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slaren
GitHub
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123
ggml-alloc.c
123
ggml-alloc.c
@ -1,3 +1,8 @@
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// defines MAP_ANONYMOUS
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#ifndef _GNU_SOURCE
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#define _GNU_SOURCE
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#endif
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#include "ggml-alloc.h"
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#include "ggml.h"
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#include <assert.h>
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@ -6,6 +11,26 @@
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#include <stdlib.h>
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#include <string.h>
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#ifdef __has_include
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#if __has_include(<unistd.h>)
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#include <unistd.h>
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#if defined(_POSIX_MAPPED_FILES)
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#include <sys/types.h>
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#include <sys/mman.h>
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#endif
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#endif
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#endif
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#if defined(_WIN32)
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#define WIN32_LEAN_AND_MEAN
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#ifndef NOMINMAX
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#define NOMINMAX
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#endif
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#include <windows.h>
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#include <memoryapi.h>
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#endif
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#define UNUSED(x) (void)(x)
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#define MAX(a, b) ((a) > (b) ? (a) : (b))
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#define GGML_MAX_CONCUR (2*GGML_MAX_NODES)
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@ -99,19 +124,24 @@ static void remove_allocated_tensor(struct ggml_allocr * alloc, struct ggml_tens
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}
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#endif
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static size_t ggml_allocator_get_alloc_size(struct ggml_allocr * alloc, struct ggml_tensor * tensor) {
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static size_t ggml_allocr_get_alloc_size(struct ggml_allocr * alloc, struct ggml_tensor * tensor) {
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return ggml_nbytes(tensor);
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UNUSED(alloc);
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}
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// check if a tensor is allocated by this buffer
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static bool ggml_allocr_is_own(struct ggml_allocr * alloc, const struct ggml_tensor * tensor) {
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void * ptr = tensor->data;
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return ptr >= alloc->data && (char *)ptr < (char *)alloc->data + alloc->max_size;
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}
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void ggml_allocr_alloc(struct ggml_allocr * alloc, struct ggml_tensor * tensor) {
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#ifdef GGML_ALLOCATOR_DEBUG
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GGML_ASSERT(ggml_is_view(tensor) == false); // views generally get data pointer from one of their sources
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GGML_ASSERT(tensor->data == NULL); // avoid allocating tensor which already has memory allocated
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#endif
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size_t size = ggml_allocator_get_alloc_size(alloc, tensor);
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size_t size = ggml_allocr_get_alloc_size(alloc, tensor);
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size = aligned_offset(NULL, size, alloc->alignment);
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AT_PRINTF("%s: allocating %s (%zu bytes) - ", __func__, tensor->name, size);
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@ -177,17 +207,17 @@ void ggml_allocr_alloc(struct ggml_allocr * alloc, struct ggml_tensor * tensor)
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}
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// this is a very naive implementation, but for our case the number of free blocks should be very small
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static void ggml_allocator_free_tensor(struct ggml_allocr * alloc, struct ggml_tensor * tensor) {
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static void ggml_allocr_free_tensor(struct ggml_allocr * alloc, struct ggml_tensor * tensor) {
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void * ptr = tensor->data;
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if (ptr < alloc->data || (char*)ptr >= (char*)alloc->data + alloc->max_size) {
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if (ggml_allocr_is_own(alloc, tensor) == false) {
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// the tensor was not allocated in this buffer
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// this can happen because the graph allocator will try to free weights and other tensors from different buffers
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// the easiest way to deal with this is just to ignore it
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return;
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}
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size_t size = ggml_allocator_get_alloc_size(alloc, tensor);
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size_t size = ggml_allocr_get_alloc_size(alloc, tensor);
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size = aligned_offset(NULL, size, alloc->alignment);
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AT_PRINTF("%s: freeing %s (%zu bytes) - n_free_blocks = %d\n", __func__, tensor->name, size, alloc->n_free_blocks);
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@ -281,24 +311,64 @@ struct ggml_allocr * ggml_allocr_new(void * data, size_t size, size_t alignment)
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return alloc;
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}
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// address and size of the buffer when measuring
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// it needs to be large enough to fit all the tensors, but it cannot overlap with other existing buffers
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static void * const MEASURE_BASE_ADDR = (void *) 0x1000;
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#if defined(__ARM_NEON) && !defined(__aarch64__)
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// 32-bit
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// TODO: Use for 32-bit x86 as well
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static const size_t MEASURE_MAX_SIZE = (1ULL<<32) - 1; // 4 GB
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// OS specific functions to allocate and free uncommitted virtual memory
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static void * alloc_vmem(size_t size) {
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#if defined(_WIN32)
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return VirtualAlloc(NULL, size, MEM_RESERVE, PAGE_NOACCESS);
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#elif defined(_POSIX_MAPPED_FILES)
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return mmap(NULL, size, PROT_NONE, MAP_PRIVATE | MAP_ANON, -1, 0);
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#else
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// 64-bit
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static const size_t MEASURE_MAX_SIZE = 1ULL<<40; // 1 TB
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// use a fixed address for other platforms
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uintptr_t base_addr = (uintptr_t)-size - 0x100;
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return (void *)base_addr;
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#endif
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}
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static void free_vmem(void * base_addr, size_t size) {
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#if defined(_WIN32)
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VirtualFree(base_addr, 0, MEM_RELEASE);
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UNUSED(size);
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#elif defined(_POSIX_MAPPED_FILES)
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munmap(base_addr, size);
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#else
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// nothing to do
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UNUSED(base_addr);
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UNUSED(size);
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#endif
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}
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// allocate uncommitted virtual memory to measure the size of the graph
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static void alloc_measure_vmem(void ** base_addr, size_t * size) {
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// 1TB for 64-bit, 1GB for 32-bit
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*size = sizeof(void *) == 4 ? 1ULL<<30 : 1ULL<<40;
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do {
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*base_addr = alloc_vmem(*size);
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if (*base_addr != NULL) {
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AT_PRINTF("allocated %.2f GB of virtual memory for measure buffer at %p\n", *size / 1024.0 / 1024.0 / 1024.0, *base_addr);
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return;
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}
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// try again with half the size
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*size /= 2;
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} while (*size > 0);
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GGML_ASSERT(!"failed to allocate virtual memory for measure buffer");
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}
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static void free_measure_vmem(void * base_addr, size_t size) {
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free_vmem(base_addr, size);
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}
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struct ggml_allocr * ggml_allocr_new_measure(size_t alignment) {
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struct ggml_allocr * alloc = (struct ggml_allocr *)malloc(sizeof(struct ggml_allocr) /* + n_free_blocks * sizeof(struct free_block) */);
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void * base_addr;
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size_t size;
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alloc_measure_vmem(&base_addr, &size);
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*alloc = (struct ggml_allocr){
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/*.data = */ MEASURE_BASE_ADDR,
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/*.size = */ MEASURE_MAX_SIZE,
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/*.data = */ base_addr,
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/*.size = */ size,
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/*.alignment = */ alignment,
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/*.n_free_blocks = */ 0,
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/*.free_blocks = */ {{0}},
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@ -318,6 +388,9 @@ struct ggml_allocr * ggml_allocr_new_measure(size_t alignment) {
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}
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void ggml_allocr_free(struct ggml_allocr * alloc) {
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if (alloc->measure) {
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free_measure_vmem(alloc->data, alloc->size);
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}
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free(alloc);
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}
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@ -387,8 +460,7 @@ static void allocate_node(struct ggml_allocr * alloc, struct ggml_tensor * node)
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}
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// if the node's data is external, then we cannot re-use it
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if ((char *) parent->data < (char *) alloc->data ||
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(char *) parent->data >= ((char *) alloc->data + alloc->size)) {
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if (ggml_allocr_is_own(alloc, parent) == false) {
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AT_PRINTF("not reusing parent %s for %s as %p is external\n", parent->name, node->name, parent->data);
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continue;
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}
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@ -422,7 +494,7 @@ static void allocate_node(struct ggml_allocr * alloc, struct ggml_tensor * node)
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}
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}
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static size_t ggml_allocator_alloc_graph_tensors_n(
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static size_t ggml_allocr_alloc_graph_tensors_n(
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struct ggml_allocr * alloc,
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struct ggml_cgraph ** graphs, int n_graphs,
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struct ggml_tensor *** inputs, struct ggml_tensor *** outputs) {
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@ -500,11 +572,10 @@ static size_t ggml_allocator_alloc_graph_tensors_n(
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AT_PRINTF("\n");
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}
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// update parents
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// update immediately if there is no parse_seq
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// update only at barriers if there is parse_seq
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if ((alloc->parse_seq_len==0) || alloc->parse_seq[ind] == -1) {
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if ((alloc->parse_seq_len == 0) || alloc->parse_seq[ind] == -1) {
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int update_start = alloc->parse_seq_len ? last_barrier_pos : ind;
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int update_end = alloc->parse_seq_len ? ind : ind + 1;
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for (int i = update_start; i < update_end; i++) {
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@ -528,12 +599,12 @@ static size_t ggml_allocator_alloc_graph_tensors_n(
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view_src_hn->n_views -= 1;
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AT_PRINTF("view_src %s: %d children, %d views\n", view_src->name, view_src_hn->n_children, view_src_hn->n_views);
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if (view_src_hn->n_views == 0 && view_src_hn->n_children == 0 && view_src->data != node->data) {
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ggml_allocator_free_tensor(alloc, view_src);
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ggml_allocr_free_tensor(alloc, view_src);
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}
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}
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else {
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if (parent->data != node->data) {
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ggml_allocator_free_tensor(alloc, parent);
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ggml_allocr_free_tensor(alloc, parent);
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}
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}
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}
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@ -550,7 +621,7 @@ static size_t ggml_allocator_alloc_graph_tensors_n(
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for (int i = 0; outputs[g][i] != NULL; i++) {
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struct ggml_tensor * output = outputs[g][i];
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AT_PRINTF("output: %s\n", output->name);
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ggml_allocator_free_tensor(alloc, output);
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ggml_allocr_free_tensor(alloc, output);
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}
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}
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}
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@ -559,5 +630,5 @@ static size_t ggml_allocator_alloc_graph_tensors_n(
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}
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size_t ggml_allocr_alloc_graph(struct ggml_allocr * alloc, struct ggml_cgraph * graph) {
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return ggml_allocator_alloc_graph_tensors_n(alloc, &graph, 1, NULL, NULL);
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return ggml_allocr_alloc_graph_tensors_n(alloc, &graph, 1, NULL, NULL);
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}
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