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[Core] Improve doc for --object-store-memory to describe how the default value is set #45301

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@jjyao jjyao commented May 13, 2024

Why are these changes needed?

Currently it's unclear how the default value is set

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…ue is set

Signed-off-by: Jiajun Yao <jeromeyjj@gmail.com>
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Thanks for the change, otherwise LGTM.

object store with. By default, this is automatically set based on
available system memory.
object store with.
By default, this is 30% of available system memory capped by the shm size.
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The logic to compute the default is a bit involved. Do you want to refer the readers to ResourceSpec.resolve() or at least mention ray_constants.DEFAULT_OBJECT_STORE_MEMORY_PROPORTION as pointers?

@@ -367,7 +367,7 @@ def debug(address):
required=False,
type=int,
help="The amount of memory (in bytes) to start the object store with. "
"By default, this is capped at 20GB but can be set higher.",
"By default, this is 30% of available system memory capped by the shm size.",
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Do you want to mention the caps like DEFAULT_OBJECT_STORE_MAX_MEMORY_BYTES and DEFAULT_OBJECT_STORE_MAX_MEMORY_BYTES as well?

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