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parallel : add option for different RNG seeds #14757

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Jul 18, 2025
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parallel : add option for different RNG seeds #14757

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14 changes: 13 additions & 1 deletion examples/parallel/parallel.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -184,6 +184,9 @@ int main(int argc, char ** argv) {
// extra text to insert in each client's prompt in order to make it larger
const int32_t n_junk = std::max(1, params.n_junk);

// signed seed, use negative values to indicate different seeds for the different clients
const int32_t & sseed = params.sampling.seed;

// init llama.cpp
llama_backend_init();
llama_numa_init(params.numa);
Expand Down Expand Up @@ -219,12 +222,21 @@ int main(int argc, char ** argv) {

const int n_ctx = llama_n_ctx(ctx);

if (sseed >= 0) {
LOG_INF("%s: initializing all samplers with the same RNG seed: %d (use a negative seed to have different seeds)\n", __func__, sseed);
} else {
LOG_INF("%s: initializing samplers with different RNG seeds, starting from %d\n", __func__, sseed);
}

std::vector<client> clients(n_clients);
for (size_t i = 0; i < clients.size(); ++i) {
auto & client = clients[i];
client.id = i;
client.smpl = common_sampler_init(model, params.sampling);
//params.sampling.seed++;

if (sseed < 0) {
params.sampling.seed--;
}
}

std::vector<llama_token> tokens_system;
Expand Down
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