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batch : add LLAMA_BATCH_DEBUG environment variable #14172

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Merged
merged 2 commits into from
Jun 13, 2025
Merged

batch : add LLAMA_BATCH_DEBUG environment variable #14172

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8dd61af
batch : add LLAMA_BATCH_DEBUG environment variable
ggerganov Jun 13, 2025
3ef36cb
cont : improve seq_id display
ggerganov Jun 13, 2025
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53 changes: 52 additions & 1 deletion src/llama-batch.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -7,6 +7,7 @@
#include <cassert>
#include <cstring>
#include <algorithm>
#include <sstream>

llama_ubatch llama_sbatch::reserve_ubatch(size_t n_ubatch, bool has_embd) {
// clear empty sequences
Expand Down Expand Up @@ -283,7 +284,10 @@ llama_sbatch::llama_sbatch(const llama_batch & batch, size_t n_embd, bool simple
);
}

llama_batch_allocr::llama_batch_allocr() = default;
llama_batch_allocr::llama_batch_allocr() {
const char * LLAMA_BATCH_DEBUG = getenv("LLAMA_BATCH_DEBUG");
debug = LLAMA_BATCH_DEBUG ? atoi(LLAMA_BATCH_DEBUG) : 0;
}

bool llama_batch_allocr::init(const llama_batch & batch_inp, const llama_vocab & vocab, llama_pos p0) {
clear();
Expand Down Expand Up @@ -356,6 +360,53 @@ bool llama_batch_allocr::init(const llama_batch & batch_inp, const llama_vocab &
n_outputs += batch.logits[i] != 0;
}

if (debug > 0) {
LLAMA_LOG_DEBUG("%s: input batch info (p0 = %d):\n", __func__, p0);
LLAMA_LOG_DEBUG("%s: n_tokens = %d\n", __func__, batch.n_tokens);
LLAMA_LOG_DEBUG("%s: token = %p\n", __func__, (void *) batch.token);
LLAMA_LOG_DEBUG("%s: embd = %p\n", __func__, (void *) batch.embd);
LLAMA_LOG_DEBUG("%s: pos = %p\n", __func__, (void *) batch.pos);
LLAMA_LOG_DEBUG("%s: n_seq_id = %p\n", __func__, (void *) batch.n_seq_id);
LLAMA_LOG_DEBUG("%s: seq_id = %p\n", __func__, (void *) batch.seq_id);
LLAMA_LOG_DEBUG("%s: logits = %p\n", __func__, (void *) batch.logits);
LLAMA_LOG_DEBUG("%s: n_outputs = %d\n", __func__, n_outputs);

if (debug > 1) {
int seq_id_max = 0;
for (int32_t i = 0; i < batch.n_tokens; ++i) {
for (int s = 0; s < batch.n_seq_id[i]; ++s) {
for (int s = 0; s < batch.n_seq_id[i]; ++s) {
seq_id_max = std::max(seq_id_max, batch.seq_id[i][s]);
}
}
}
++seq_id_max;

LLAMA_LOG_DEBUG("%s: token = [\n", __func__);
for (int32_t i = 0; i < batch.n_tokens; ++i) {
std::vector<int8_t> seq_id(seq_id_max);

for (int s = 0; s < batch.n_seq_id[i]; ++s) {
seq_id[batch.seq_id[i][s]] = 1;
}

std::stringstream ss;
for (int s = 0; s < seq_id_max; ++s) {
if (seq_id[s]) {
ss << s%10;
} else {
ss << ".";
}
}

LLAMA_LOG_DEBUG("%s: %4d: id = %6d (%16s), pos = %4d, n_seq_id = %2d, seq_id = [%s], output = %d\n",
__func__, i, batch.token[i], vocab.token_to_piece(batch.token[i]).c_str(),
batch.pos[i], batch.n_seq_id[i], ss.str().c_str(), batch.logits[i]);
}
LLAMA_LOG_DEBUG("%s: ]\n", __func__);
}
}

return true;
}

Expand Down
2 changes: 2 additions & 0 deletions src/llama-batch.h
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Original file line number Diff line number Diff line change
Expand Up @@ -102,4 +102,6 @@ class llama_batch_allocr {
std::vector<int32_t> n_seq_id;
std::vector<llama_seq_id *> seq_id;
std::vector<int8_t> output;

int debug;
};
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