lriggs commented on issue #48159:
URL: https://github.com/apache/arrow/issues/48159#issuecomment-3573235237
Some profiling I did.
With the MCJIT engine it create one TargetMachine in llvm:
https://github.com/user-attachments/assets/2b90a5fc-8df0-4d88-98cc-0533e9b84d0b";
/>
But after the changes to ORCJIT it is creating three:
https://github.com/user-attachments/assets/5353dc93-57ba-4ba0-9aca-0d1de7619828";
/>
My testing and the llvm code seems to indicate this can be resource
intensive.
https://llvm.org/doxygen/JITTargetMachineBuilder_8h_source.html says `///
Get the default DataLayout for the target.
///
/// Note: This is reasonably expensive, as it creates a temporary
/// TargetMachine instance under the hood. It is only suitable for use
during
/// JIT setup.
[Expected](https://llvm.org/doxygen/classllvm_1_1Expected.html)
[getDefaultDataLayoutForTarget](https://llvm.org/doxygen/classllvm_1_1orc_1_1JITTargetMachineBuilder.html#aae1a8efd4b4afe6411908938a204fa0b)()
{`
Only one target machine is created after a proposed refactoring:
https://github.com/user-attachments/assets/fb55ee5e-1706-44f4-8c36-cf84407c6334";
/>
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