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kv-cache : add LLAMA_KV_CACHE_DEBUG environment variable #14121

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Merged
merged 1 commit into from
Jun 11, 2025
Merged

kv-cache : add LLAMA_KV_CACHE_DEBUG environment variable #14121

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53 changes: 39 additions & 14 deletions src/llama-kv-cache-unified.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -127,6 +127,9 @@ llama_kv_cache_unified::llama_kv_cache_unified(
ggml_type_name(type_k), (float)memory_size_k / (1024.0f * 1024.0f),
ggml_type_name(type_v), (float)memory_size_v / (1024.0f * 1024.0f));
}

const char * LLAMA_KV_CACHE_DEBUG = getenv("LLAMA_KV_CACHE_DEBUG");
debug = LLAMA_KV_CACHE_DEBUG ? atoi(LLAMA_KV_CACHE_DEBUG) : 0;
}

void llama_kv_cache_unified::clear(bool data) {
Expand Down Expand Up @@ -517,36 +520,58 @@ int32_t llama_kv_cache_unified::find_slot(const llama_ubatch & ubatch) const {
return -1;
}

//#define FIND_SLOT_DEBUG 1
#if FIND_SLOT_DEBUG
LLAMA_LOG_WARN("begin: n = %5d, used = %5d, head = %5d, n_swa = %5d\n", cells.used_max_p1(), cells.get_used(), head, n_swa);
if (debug > 0) {
LLAMA_LOG_CONT("\n");
LLAMA_LOG_DEBUG("%s: n = %5d, used = %5d, head = %5d, size = %5d, n_swa = %5d\n", __func__, cells.used_max_p1(), cells.get_used(), head, get_size(), n_swa);

// for debugging
{
std::string ss;
if (n_swa > 0) {
if ((debug == 2 && n_swa > 0) || debug > 2) {
std::string ss;
for (uint32_t i = 0; i < cells.size(); ++i) {
if (cells.is_empty(i)) {
ss += '.';
} else {
ss += std::to_string(cells.seq_get(i));
}
if (i%256 == 255) {
ss += " *";
ss += '\n';
}
}
LLAMA_LOG_DEBUG("\n%s\n", ss.c_str());
}
LLAMA_LOG_WARN("\n%s\n", ss.c_str());
}

for (int s = 0; s < LLAMA_MAX_PARALLEL_SEQUENCES; ++s) {
if (cells.seq_pos_min(s) < 0) {
continue;
if ((debug == 2 && n_swa > 0) || debug > 2) {
std::string ss;
for (uint32_t i = 0; i < cells.size(); ++i) {
std::string cur;
if (cells.is_empty(i)) {
cur = '.';
} else {
cur = std::to_string(cells.pos_get(i));
}
const int n = cur.size();
for (int j = 0; j < 5 - n; ++j) {
cur += ' ';
}
ss += cur;
if (i%256 == 255) {
ss += " *";
}
if (i%64 == 63) {
ss += '\n';
}
}
LLAMA_LOG_DEBUG("\n%s\n", ss.c_str());
}

LLAMA_LOG_WARN("kv_cells: n_swa = %4d, min[%d] = %5d, max[%d] = %5d\n", n_swa, s, cells.seq_pos_min(s), s, cells.seq_pos_max(s));
for (int s = 0; s < LLAMA_MAX_PARALLEL_SEQUENCES; ++s) {
if (cells.seq_pos_min(s) < 0) {
continue;
}

LLAMA_LOG_DEBUG("%s: min[%d] = %5d, max[%d] = %5d\n", __func__, s, cells.seq_pos_min(s), s, cells.seq_pos_max(s));
}
}
#endif

uint32_t n_tested = 0;

Expand Down
2 changes: 2 additions & 0 deletions src/llama-kv-cache-unified.h
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Original file line number Diff line number Diff line change
Expand Up @@ -158,6 +158,8 @@ class llama_kv_cache_unified : public llama_memory_i {
// SWA
const uint32_t n_swa = 0;

int debug = 0;

const llama_swa_type swa_type = LLAMA_SWA_TYPE_NONE;

std::vector<ggml_context_ptr> ctxs;
Expand Down
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