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# Copyright (c) Microsoft Corporation.
# SPDX-License-Identifier: Apache-2.0
# DeepSpeed Team
"""
Functionality of swapping optimizer tensors to/from (NVMe) storage devices.
"""
import os
import time
from deepspeed.ops.aio import AsyncIOBuilder
from .test_ds_aio_utils import task_log, create_filename, create_file, create_page_locked_tensor
from .ds_aio_constants import *
class AIOBasic_Engine(object):
def __init__(self, args, tid, read_op):
self.ctxt = self._create_context(args, tid, read_op)
def fini(self):
self.ctxt[BUFFER].detach()
self.ctxt[BUFFER] = None
def read(self, args, tid, loop_id):
start_time = time.time()
AsyncIOBuilder().load().aio_read(self.ctxt[BUFFER], self.ctxt[FILE], args.block_size, args.queue_depth,
args.single_submit, not args.sequential_requests, args.validate)
end_time = time.time()
self.ctxt[ELAPSED_SEC] += end_time - start_time
def write(self, args, tid, loop_id):
# Avoid overwriting existing files as it could be artificially faster
if os.path.isfile(self.ctxt[FILE]):
os.remove(self.ctxt[FILE])
start_time = time.time()
AsyncIOBuilder().load().aio_write(self.ctxt[BUFFER], self.ctxt[FILE], args.block_size, args.queue_depth,
args.single_submit, not args.sequential_requests, args.validate)
end_time = time.time()
self.ctxt[ELAPSED_SEC] += end_time - start_time
def _create_context(self, args, tid, read_op):
io_string = "Read" if read_op else "Write"
device_id, folder = args.mapping_list[tid]
filename = create_filename(folder, args.read, args.io_size, tid)
if args.read and not (os.path.isfile(filename) and os.path.getsize(filename) == args.io_size):
create_file(filename, args.io_size)
task_log(tid, f'Allocate tensor of size {args.io_size} bytes')
buffer = create_page_locked_tensor(args.io_size, True)
task_log(tid,
f'{io_string} file {filename} of size {args.io_size} bytes from buffer on device {buffer.device}')
task_log(tid, f'created deepspeed aio basic engine')
ctxt = {}
ctxt[FILE] = filename
ctxt[NUM_BYTES] = args.io_size
ctxt[BUFFER] = buffer
ctxt[ELAPSED_SEC] = 0
return ctxt