Can I run two bare-metal threads in different tiles?

[Marcelo Ruaro]

Hello,

I would like to run two bare-metal threads in different tiles.

Let's assume that I have thread_1.c and thread_2.c, and I would like to run them tile 1 and tile 2, respectively. This is possible without an OS, just bare-metal?

Best,

Marcelo

[Jonathan Balkind]

Hi Marcelo,

We don't directly provide a mechanism for this but you could engineer something without too much trouble if you didn't require it strictly to be two separate files. Cores can read their hartids in a shared main function and then jump to the relevant code that they should specifically be running based on the hartid.

Thanks,

Jon

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[Marcelo Ruaro]

Thank you for you reply Jon,

Yes, I see (and I'm actually following it) that this the way to implement the desired behavior in baremetal. And also, using the atomic operations and locks provided by https://github.com/torvalds/linux/tree/ef78e5ec9214376c5cb989f5da70b02d0c117b66/arch/riscv/include/asm to synchronize among tasks.

Congratulation for this impressive many-core framework. I can say that because I am one of the main developer of Memphis many-core framework (with distributed memories) https://www.inf.pucrs.br/hemps/memphis.html, and know how difficult is to reach a fully automated generation framework like you guys have reached.

Best,

Marcelo

[Jonathan Balkind]

Hi Marcelo,

I take it you got pointed there from the example convenience macros we had here? https://github.com/PrincetonUniversity/openpiton/blob/9c2cf06f8535d20cc36082fc3bad6f7a7fa2eb0b/piton/verif/diag/assembly/include/riscv/ariane/util.h#L46-L72

I remember seeing one of your Memphis papers, very impressive work! I'm really glad to hear that you're checking out OpenPiton and happy to give pointers where I can :)

Thanks,

Jon

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