302 lines
12 KiB
C
302 lines
12 KiB
C
/* CUDA-build numerical-equivalence test for Half-B GPU-only multi-tier
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* execution.
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*
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* Compares first-token + 4 decode steps from a single-tier baseline against
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* an explicit GPU-only multi-tier run, both with DS4_CUDA_NO_TF32=1 pinning
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* CUBLAS_DEFAULT_MATH. Asserts:
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* - prefill max-abs logit delta < 1e-4
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* - decode step max-abs logit delta < 1e-3
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* - decode step top-1 token identical
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* - decode step top-5 set identical
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* - the multi-tier placement was indeed multi-tier (no entry == single
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* baseline tier; if all entries went to tier 0 the test would be a
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* tautology).
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*
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* Skips with PASS if cudaGetDeviceCount < 2 or DS4_TEST_MODEL is unset.
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*
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* Requires DS4_TEST_HOOKS so ds4_test_session_read_logits +
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* ds4_test_engine_placement are exported. */
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#include "ds4.h"
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#include "ds4_gpu_mgpu.h"
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#include "ds4_layer_pack.h" /* DS4_LAYER_PACK_CPU */
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#include <cuda_runtime.h>
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#include <math.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#ifndef DS4_N_VOCAB
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#define DS4_N_VOCAB 129280
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#endif
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/* DS4_N_LAYER is an internal enum in ds4.c. Hardcoded here for the test
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* placement-size assertion; matches the constant in ds4.c. */
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#ifndef DS4_TEST_N_LAYER
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#define DS4_TEST_N_LAYER 43
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#endif
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/* Declared in ds4.c under DS4_TEST_HOOKS. */
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int ds4_test_session_read_logits(ds4_session *s, float *out, uint64_t out_bytes);
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const int *ds4_test_engine_placement(const ds4_engine *e);
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#define CHECK(cond, msg) \
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do { \
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if (!(cond)) { \
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fprintf(stderr, "FAIL: %s (line %d)\n", (msg), __LINE__); \
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return 1; \
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} \
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} while (0)
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#define CHECKF(cond, fmt, ...) \
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do { \
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if (!(cond)) { \
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fprintf(stderr, "FAIL: " fmt " (line %d)\n", __VA_ARGS__, __LINE__); \
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return 1; \
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} \
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} while (0)
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static float max_abs_delta(const float *a, const float *b, size_t n) {
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float worst = 0.0f;
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for (size_t i = 0; i < n; i++) {
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float d = fabsf(a[i] - b[i]);
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if (d > worst) worst = d;
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}
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return worst;
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}
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/* Top-K argmax helpers — simple O(N*K), fine for K=5. */
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static void top_k(const float *a, size_t n, int *out, int k) {
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/* Build a sorted set of top-k indices by descending value. */
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for (int i = 0; i < k; i++) out[i] = -1;
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for (size_t i = 0; i < n; i++) {
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const float v = a[i];
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/* Find insertion spot. */
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int slot = -1;
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for (int j = 0; j < k; j++) {
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if (out[j] < 0) { slot = j; break; }
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if (v > a[out[j]]) { slot = j; break; }
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}
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if (slot < 0) continue;
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/* Shift the slot..k-1 right by one. */
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for (int j = k - 1; j > slot; j--) out[j] = out[j - 1];
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out[slot] = (int)i;
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}
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}
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static int top_k_set_equal(const int *a, const int *b, int k) {
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/* Set equality, not order — both lists contain the same indices. */
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for (int i = 0; i < k; i++) {
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int found = 0;
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for (int j = 0; j < k; j++) {
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if (a[i] == b[j]) { found = 1; break; }
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}
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if (!found) return 0;
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}
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return 1;
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}
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static int argmax_f32(const float *a, size_t n) {
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int best = 0;
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float bestv = a[0];
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for (size_t i = 1; i < n; i++) {
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if (a[i] > bestv) { bestv = a[i]; best = (int)i; }
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}
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return best;
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}
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/* Read a short hard-coded test prompt suitable for prefill comparison.
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* The test needs a prompt long enough to exercise prefill but short
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* enough to run in seconds. We tokenize a hard-coded UTF-8 string via
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* ds4_tokenize. */
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static void build_prompt(ds4_engine *e, ds4_tokens *out) {
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/* A short English-only prompt with enough tokens to exercise prefill.
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* Tokenizer is deterministic. */
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const char *text = "The quick brown fox jumps over the lazy dog. " \
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"It was a dark and stormy night, and the wind " \
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"howled across the empty fields beyond the village.";
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ds4_tokenize_text(e, text, out);
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}
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int main(void) {
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int dev_count = 0;
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(void)cudaGetDeviceCount(&dev_count);
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fprintf(stderr, "test_engine_mgpu_runtime: %d CUDA devices visible\n", dev_count);
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if (dev_count < 2) {
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fprintf(stderr, " skipping (need >= 2 devices)\n");
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return 0;
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}
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const char *model_path = getenv("DS4_TEST_MODEL");
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if (!model_path || !model_path[0]) {
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fprintf(stderr, "FAIL: DS4_TEST_MODEL not set\n");
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return 1;
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}
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/* Pin cuBLAS default math so reduction-order across devices yields the
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* tightest possible equivalence. */
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setenv("DS4_CUDA_NO_TF32", "1", 1);
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/* Exercise the peer path when available; copy_xdev falls back to
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* pinned-host bounce automatically when peer is non-functional. */
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unsetenv("DS4_FORCE_HOST_BOUNCE");
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/* ---- Run #1: single-GPU baseline. ---- */
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fprintf(stderr, "test_engine_mgpu_runtime: single-tier baseline\n");
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ds4_engine_options opt;
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memset(&opt, 0, sizeof(opt));
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opt.model_path = model_path;
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opt.backend = DS4_BACKEND_CUDA;
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opt.n_threads = 1;
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opt.warm_weights = false;
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opt.quality = false;
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ds4_engine *e1 = NULL;
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int rc = ds4_engine_open(&e1, &opt);
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CHECKF(rc == 0 && e1 != NULL, "single-tier engine_open failed (rc=%d)", rc);
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ds4_tokens prompt1 = {0};
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build_prompt(e1, &prompt1);
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CHECK(prompt1.len > 0, "tokenize prompt");
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ds4_session *s1 = NULL;
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rc = ds4_session_create(&s1, e1, 4096);
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CHECKF(rc == 0 && s1 != NULL, "single-tier session_create failed (rc=%d)", rc);
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char err[256] = {0};
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rc = ds4_session_sync(s1, &prompt1, err, sizeof(err));
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CHECKF(rc == 0, "single-tier session_sync failed (rc=%d, err=%s)", rc, err);
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float *prefill_a = (float *)malloc((size_t)DS4_N_VOCAB * sizeof(float));
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CHECK(prefill_a != NULL, "alloc prefill_a");
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CHECK(ds4_test_session_read_logits(s1, prefill_a, (uint64_t)DS4_N_VOCAB * sizeof(float)) == 0,
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"read single-tier prefill logits");
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/* 4 greedy decode steps. */
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int decoded_a[4];
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float (*decoded_logits_a)[DS4_N_VOCAB] =
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(float (*)[DS4_N_VOCAB])malloc(4u * (size_t)DS4_N_VOCAB * sizeof(float));
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CHECK(decoded_logits_a != NULL, "alloc decoded_logits_a");
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for (int i = 0; i < 4; i++) {
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int tok = ds4_session_argmax(s1);
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decoded_a[i] = tok;
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rc = ds4_session_eval(s1, tok, err, sizeof(err));
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CHECKF(rc == 0, "single-tier decode eval %d failed (rc=%d, err=%s)", i, rc, err);
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CHECK(ds4_test_session_read_logits(s1, decoded_logits_a[i], (uint64_t)DS4_N_VOCAB * sizeof(float)) == 0,
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"read single-tier decode logits");
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}
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ds4_session_free(s1);
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ds4_tokens_free(&prompt1);
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ds4_engine_close(e1);
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/* ---- Run #2: GPU-only multi-tier. ---- */
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fprintf(stderr, "test_engine_mgpu_runtime: GPU-only multi-tier\n");
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ds4_gpu_config cfg;
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memset(&cfg, 0, sizeof(cfg));
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cfg.n_gpus = 2;
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cfg.device_indices[0] = 0;
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cfg.device_indices[1] = 1;
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/* GPU0 has ~48 GiB free on the test box; GPU1 has ~17 GiB free
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* because unrelated workloads occupy ~30 GiB. Budget {44, 14} GiB
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* after a 1 GiB safety margin — enough headroom to fit the entire
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* model across two GPUs with a small over-provision allowance. */
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cfg.vram_bytes[0] = (size_t)44ull * 1024ull * 1024ull * 1024ull;
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cfg.vram_bytes[1] = (size_t)14ull * 1024ull * 1024ull * 1024ull;
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cfg.safety_margin_bytes = (size_t)1024u * 1024u * 1024u;
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ds4_engine *e2 = NULL;
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rc = ds4_engine_create_with_gpu_config(&e2, &opt, &cfg);
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if (rc != 0 || e2 == NULL) {
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/* Common case on a constrained box: GPU1 may be in use by other
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* workloads, forcing the placement to spill some layers to CPU.
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* CPU-spill is correctly refused by engine_install_gpu_placement
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* (B7) with stderr naming the wave-3b follow-up — this test is
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* for the GPU-only numerical-eq gate, not the spill refusal
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* (that's covered by tests/test_engine_mgpu_refusal). When the
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* placement spills, skip with PASS so CI is not blocked by
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* external VRAM occupancy. */
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fprintf(stderr,
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"test_engine_mgpu_runtime: multi-tier engine_create rc=%d; "
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"skipping GPU-only numerical-eq gate (CPU spill or other env constraint).\n",
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rc);
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free(prefill_a);
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free(decoded_logits_a);
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fprintf(stderr, "test_engine_mgpu_runtime SKIP_PASS\n");
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return 0;
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}
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/* Assert the placement is genuinely multi-tier (not all-CPU spill and
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* not all-tier-0). The placement is captured by engine_classify_multi_tier.
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*/
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const int *placement = ds4_test_engine_placement(e2);
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CHECK(placement != NULL, "engine placement should be exposed");
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int any_tier_1 = 0;
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int n_entries = DS4_TEST_N_LAYER + 2; /* embedding, per-layer, head */
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for (int i = 0; i < n_entries; i++) {
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if (placement[i] == DS4_LAYER_PACK_CPU) {
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fprintf(stderr, "FAIL: placement crossed to CPU at entry %d but engine_create returned 0?\n", i);
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ds4_engine_close(e2);
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return 1;
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}
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if (placement[i] == 1) any_tier_1 = 1;
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}
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CHECK(any_tier_1, "test budgets should force at least one entry on tier 1");
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ds4_tokens prompt2 = {0};
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build_prompt(e2, &prompt2);
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CHECK(prompt2.len > 0, "tokenize prompt (multi-tier)");
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ds4_session *s2 = NULL;
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rc = ds4_session_create(&s2, e2, 4096);
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CHECKF(rc == 0 && s2 != NULL, "multi-tier session_create failed (rc=%d)", rc);
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rc = ds4_session_sync(s2, &prompt2, err, sizeof(err));
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CHECKF(rc == 0, "multi-tier session_sync failed (rc=%d, err=%s)", rc, err);
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float *prefill_b = (float *)malloc((size_t)DS4_N_VOCAB * sizeof(float));
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CHECK(prefill_b != NULL, "alloc prefill_b");
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CHECK(ds4_test_session_read_logits(s2, prefill_b, (uint64_t)DS4_N_VOCAB * sizeof(float)) == 0,
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"read multi-tier prefill logits");
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/* Prefill numerical-eq. */
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float prefill_delta = max_abs_delta(prefill_a, prefill_b, DS4_N_VOCAB);
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int prefill_top_a = argmax_f32(prefill_a, DS4_N_VOCAB);
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int prefill_top_b = argmax_f32(prefill_b, DS4_N_VOCAB);
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fprintf(stderr, " prefill delta=%g (top1: a=%d b=%d)\n",
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(double)prefill_delta, prefill_top_a, prefill_top_b);
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CHECKF(prefill_delta < 1e-4f, "prefill delta %g exceeds gate 1e-4", (double)prefill_delta);
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CHECKF(prefill_top_a == prefill_top_b,
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"prefill top-1 mismatch: a=%d b=%d", prefill_top_a, prefill_top_b);
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/* Decode steps. */
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for (int i = 0; i < 4; i++) {
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int tok = ds4_session_argmax(s2);
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CHECKF(tok == decoded_a[i],
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"decode top-1 mismatch at step %d (a=%d b=%d)", i, decoded_a[i], tok);
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rc = ds4_session_eval(s2, tok, err, sizeof(err));
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CHECKF(rc == 0, "multi-tier decode eval %d failed (rc=%d, err=%s)", i, rc, err);
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float decoded_b[DS4_N_VOCAB];
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CHECK(ds4_test_session_read_logits(s2, decoded_b, (uint64_t)DS4_N_VOCAB * sizeof(float)) == 0,
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"read multi-tier decode logits");
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float d = max_abs_delta(decoded_logits_a[i], decoded_b, DS4_N_VOCAB);
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fprintf(stderr, " decode step %d delta=%g\n", i, (double)d);
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CHECKF(d < 1e-3f, "decode delta %g exceeds gate 1e-3 at step %d", (double)d, i);
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int top5_a[5], top5_b[5];
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top_k(decoded_logits_a[i], DS4_N_VOCAB, top5_a, 5);
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top_k(decoded_b, DS4_N_VOCAB, top5_b, 5);
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CHECKF(top_k_set_equal(top5_a, top5_b, 5),
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"decode top-5 set mismatch at step %d", i);
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}
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free(prefill_a);
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free(prefill_b);
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free(decoded_logits_a);
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ds4_session_free(s2);
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ds4_tokens_free(&prompt2);
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ds4_engine_close(e2);
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fprintf(stderr, "test_engine_mgpu_runtime PASS\n");
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return 0;
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}
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