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Define XLA.DEFAULT_DEVICE to set default device ID #1866

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Define XLA.DEFAULT_DEVICE to set default device ID #1866

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2c169ef
Use `REACTANT_DEFAULT_DEVICE` to set default device ID with env var
giordano Nov 13, 2025
3f9be82
Interpret `REACTANT_DEFAULT_DEVICE` as 0-based
giordano Nov 13, 2025
af67d52
Use global `const` `Reactant.XLA.DEFAULT_DEVICE` instead of env var
giordano Nov 13, 2025
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11 changes: 10 additions & 1 deletion src/xla/Client.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -13,4 +13,13 @@ function get_device end
function get_addressable_device end
function platform_name end

default_device(client::AbstractClient) = first(addressable_devices(client))
"""
DEFAULT_DEVICE :: Ref{Int}

0-based index of default device to use, by default 0 (first available device).
"""
const DEFAULT_DEVICE = Ref{Int}(0)
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@wsmoses wsmoses Nov 13, 2025

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if we're not doing an env var we can leave this as 1-indexed. [reason for env var is cuz cuda_visible_devices and friends are 0-indexed]

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@wsmoses wsmoses Nov 13, 2025

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also if you want we can still do DEFAULT_DEVICE = Ref{Int}(something(tryparse, ...)


function default_device(client::AbstractClient)
return addressable_devices(client)[DEFAULT_DEVICE[] + 1]
end
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