Multi Gemmini, but only one core wil run job, others idle

[bysg]

Config chip with Multi Gemmini(and rocket), and run template.c test, bus only one core(which hartid is 0) can run programm; others core keep idle(pc is unchanged because begu cmd cannot jump);

So, if simulation with Multi Gemmini, how to modify the C program?

[rudemora]

Hi!
I'd really appreciate it if you could give some details on how to configure multigemmini. I've seen that in CustomSoCConfigs.scala you can change the number of cores, but that function simply adds a core, not a gemmini for each core.

Thanks!!

[bysg]

use config to generate 2rv + 2gemmini

[rudemora]

I’m not entirely sure about this, but does that setup actually create two Gemminis, or does it just create two cores with a single Gemmini? From what I can see, LeanGemminiConfig seems to instantiate only one Gemmini.

If the goal is to have two Gemminis, one approach could be to instantiate two separate Gemmini modules (for example, by duplicating the accelerator creation inside LeanGemminiConfig) and assign them different opcode values (0–3). For benchmarks, you could adjust XCUSTOM_ACC in gemmini_params.h (gemmini-rocc-tests) depending on which Gemmini you want to run. By default, a Gemmini is created with opcode = 3, which is why that’s the default XCUSTOM.

[bysg]

it will create two rv cores and two gemmini, and one rv core releated with only one gemmini;
and 2 gemmini is same totally, so instruction of each gemmini always be same.
because each rv related with only one gemmini(or one rv can only send instructions to only one gemmini), so 2 rv(or 2 gemmini can run at the same time parallel).