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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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4cdb9ec
Use `REACTANT_DEFAULT_DEVICE` to set default device ID with env var
giordano Nov 13, 2025
8c186e2
Interpret `REACTANT_DEFAULT_DEVICE` as 0-based
giordano Nov 13, 2025
541087e
Use global `const` `Reactant.XLA.DEFAULT_DEVICE` instead of env var
giordano Nov 13, 2025
3bb3be9
Make `DEFAULT_DEVICE` 1-based
giordano Dec 3, 2025
26a1438
Revert "Make `DEFAULT_DEVICE` 1-based"
giordano Dec 3, 2025
8ea159a
Use the `REACTANT_DEFAULT_DEVICE` environment variable
giordano Dec 3, 2025
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12 changes: 11 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 +13,14 @@ 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, the value of the environment variable `REACTANT_DEFAULT_DEVICE` is used when set to a non-negative integer, otherwise it is set to 0 (first available device).
"""
const DEFAULT_DEVICE = Ref{Int}(0)

function default_device(client::AbstractClient)
return addressable_devices(client)[DEFAULT_DEVICE[] + 1]
end
7 changes: 7 additions & 0 deletions src/xla/XLA.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -158,6 +158,13 @@ function __init__()
1
end

if haskey(ENV, "REACTANT_DEFAULT_DEVICE")
DEFAULT_DEVICE[] = max(
0, something(tryparse(Int, ENV["REACTANT_DEFAULT_DEVICE"]), 0)
)
@debug "REACTANT_DEFAULT_DEVICE: " DEFAULT_DEVICE[] maxlog = 1
end

@debug "REACTANT_XLA_RUNTIME: " REACTANT_XLA_RUNTIME maxlog = 1

@ccall MLIR.API.mlir_c.RegisterEnzymeXLACPUHandler()::Cvoid
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