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hijkzzz avatar hijkzzz commented on July 30, 2024

会的 用 ZeRO3 即可

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shenlayu avatar shenlayu commented on July 30, 2024

会的 用 ZeRO3 即可

感谢!所以开zero2的时候,每张卡上num_gpus_per_actor无论设置为几显存都一样大是正常现象吗?这个值是否不应该大于1?

from openrlhf.

hijkzzz avatar hijkzzz commented on July 30, 2024

会的 用 ZeRO3 即可

感谢!所以开zero2的时候,每张卡上num_gpus_per_actor无论设置为几显存都一样大是正常现象吗?这个值是否不应该大于1?

开zero2 optimizer会切片 num_gpus_per_actor越大 占用内存越小。

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shenlayu avatar shenlayu commented on July 30, 2024

感谢!不好意思还有最后一个问题。openrlhf/trainer/ray/launcher.py中的写法是

for rank in range(1, world_size):
    local_rank = rank % self._num_gpus_per_node
    if pg:
        worker_actor = self.ray_actor_type.options(
            num_cpus=num_gpus_per_actor,
            num_gpus=num_gpus_per_actor,
            resources=self._resources,
            scheduling_strategy=PlacementGroupSchedulingStrategy(
                placement_group=pg,
                placement_group_bundle_index=rank // self._num_gpus_per_node,
            ),
        ).remote(world_size, rank, local_rank, master_addr, master_port)

也就是说创建的Actor的数量不少于Actor占用的总GPU数量?我是否可以只创建一个Actor而让其占用多个显卡,还是因为某些原因必须在每张卡上都创建一个Actor?存在更加节省显存的方式吗?十分感谢您耐心的解答!

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