FastDeploy/fastdeploy/worker/gpu_worker.py

"""
# Copyright (c) 2025  PaddlePaddle Authors. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License"
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""
import gc
import time
from typing import List, Optional

import paddle
import paddle.nn as nn
import pynvml

from fastdeploy.config import FDConfig
from fastdeploy.engine.request import Request
from fastdeploy.utils import get_logger
from fastdeploy.worker.gpu_model_runner import GPUModelRunner
from fastdeploy.worker.output import ModelRunnerOutput
from fastdeploy.worker.worker_base import WorkerBase

logger = get_logger("gpu_worker", "gpu_worker.log")


class GpuWorker(WorkerBase):
    """ """

    def __init__(
        self,
        fd_config: FDConfig,
        local_rank: int,
        rank: int,
    ):
        super().__init__(
            fd_config=fd_config,
            local_rank=local_rank,
            rank=rank,
        )
        pass

    def init_device(self):
        """ Initialize device and Construct model runner
        """
        if self.device_config.device_type == "cuda" and paddle.device.is_compiled_with_cuda(
        ):
            # Set evironment variable
            self.device_ids = self.parallel_config.device_ids.split(",")
            self.device = f"gpu:{self.local_rank}"
            paddle.device.set_device(self.device)
            paddle.set_default_dtype(self.parallel_config.dtype)

            gc.collect()
            paddle.device.cuda.empty_cache()
        else:
            raise RuntimeError(
                f"Not support device type: {self.device_config.device}")

        # Construct model runner
        self.model_runner: GPUModelRunner = GPUModelRunner(
            fd_config=self.fd_config,
            device=self.device,
            device_id=self.device_ids[self.local_rank],
            rank=self.rank,
            local_rank=self.local_rank)
    
    def prefill_finished(self):
        """
        check whether prefill stage finished
        """
        return self.model_runner.prefill_finished()

    def determine_available_memory(self) -> int:
        """
        Profiles the peak memory usage of the model to determine how much
        memory can be used for KV cache without OOMs.

        The engine will first conduct a profiling of the existing memory usage.
        Then, it calculate the maximum possible number of GPU and CPU blocks
        that can be allocated with the remaining free memory.

        Tip:
            You may limit the usage of GPU memory
            by adjusting the `gpu_memory_utilization` parameter.
        """
        # 1. Record memory state before profile run
        start_time = time.perf_counter()
        Gb = 1024**3
        paddle.device.cuda.reset_max_memory_reserved(self.local_rank)
        paddle.device.cuda.reset_max_memory_allocated(self.local_rank)
        paddle_reserved_mem_before_run = paddle.device.cuda.max_memory_reserved(
            self.local_rank)
        paddle_allocated_mem_before_run = paddle.device.cuda.max_memory_allocated(
            self.local_rank)  # not reserved

        pynvml.nvmlInit()
        handle = pynvml.nvmlDeviceGetHandleByIndex(
            int(self.device_ids[self.local_rank]))
        before_run_meminfo = pynvml.nvmlDeviceGetMemoryInfo(handle)

        logger.info((
            "Before running the profile, the memory usage info is as follows:",
            f"\nDevice Total memory: {before_run_meminfo.total / Gb}",
            f"\nDevice used memory: {before_run_meminfo.used / Gb}",
            f"\nDevice free memory: {before_run_meminfo.free / Gb}",
            f"\nPaddle reserved memory: {paddle_reserved_mem_before_run / Gb}",
            f"\nPaddle allocated memory: {paddle_allocated_mem_before_run / Gb}"))

        # 2. Profile run
        self.model_runner.profile_run()

        # 3. Statistical memory information
        paddle_reserved_mem_after_run = paddle.device.cuda.max_memory_reserved(
            self.local_rank)
        paddle_allocated_mem_after_run = paddle.device.cuda.max_memory_allocated(
            self.local_rank)

        

        # NOTE(gongshaotian): v1 worker
        # not_paddle_use_mem = after_run_meminfo.used - paddle_reserved_mem_after_run
        # peak_memory = paddle_allocated_mem_after_run + not_paddle_use_mem
        # available_kv_cache_memory = after_run_meminfo.total * \
        #    self.parallel_config.gpu_memory_utilization - peak_memory

        # v0 worker
        model_block_memory_used = self.cal_theortical_kvcache()
        paddle_peak_increase = paddle_reserved_mem_after_run - paddle_allocated_mem_before_run

        paddle.device.cuda.empty_cache()

        after_run_meminfo = pynvml.nvmlDeviceGetMemoryInfo(handle)
        pynvml.nvmlShutdown()

        available_kv_cache_memory = after_run_meminfo.total * \
            self.parallel_config.gpu_memory_utilization - after_run_meminfo.used - paddle_peak_increase
        available_kv_cache_memory += model_block_memory_used * self.parallel_config.max_block_num
        

        end_time = time.perf_counter()
        logger.info(
            ("After running the profile, the memory usage info is as follows:",
             f"\nDevice Total memory: {after_run_meminfo.total / Gb}",
             f"\nDevice used memory: {after_run_meminfo.used / Gb}",
             f"\nDevice free memory: {after_run_meminfo.free / Gb}",
             f"\nPaddle reserved memory: {paddle_reserved_mem_after_run / Gb}",
             f"\nPaddle allocated memory: {paddle_allocated_mem_after_run / Gb}",
             f"\nAvailable KV Cache meomory: {available_kv_cache_memory / Gb}",
             f"Profile time: {end_time - start_time}"))

        return available_kv_cache_memory  # return to caculate the block num in this device

    def load_model(self) -> None:
        """ """
        self.model_runner.load_model()

    def get_model(self) -> nn.Layer:
        """ """
        return self.model_runner.get_model()

    def initialize_cache(self, num_gpu_blocks: int,
                         num_cpu_blocks: int) -> None:
        """ """
        pass

    def execute_model(
        self,
        model_forward_batch: Optional[List[Request]] = None,
    ) -> Optional[ModelRunnerOutput]:
        """ """
        output = self.model_runner.execute_model(model_forward_batch)
        return output

    def preprocess_new_task(self, req_dicts: List[Request]) -> None:
        """ Process new requests and then start the decode loop
        TODO(gongshaotian):The scheduler should schedule the handling of prefill,
        and workers and modelrunners should not perceive it.
        """
        self.model_runner.insert_prefill_inputs(req_dicts=req_dicts)

    def graph_optimize_and_warm_up_model(self) -> None:
        """
        Perform the warm-up and the graph optimization
        """
        # 1. Warm up model
        # NOTE(gongshaotian): may be not need warm_up at this place

        # 2. Triger cuda grpah capture
        self.model_runner.capture_model()

    def check_health(self) -> bool:
        """ """
        return True

    def cal_theortical_kvcache(self) -> int:
        """ """
        return self.model_runner.cal_theortical_kvcache()

    def reinitialize_kv_cache(self, num_gpu_blocks: int) -> None:
        """ """
        self.model_runner.update_share_input_block_num(
            num_gpu_blocks=num_gpu_blocks)