Merge commit 'c20c44514a06a3fd70e3d2e8b830812047360e5b' into concedo_experimental

# Conflicts:
#	.github/workflows/python-type-check.yml
#	examples/speculative/speculative.cpp
#	ggml/src/ggml-hexagon/ggml-hexagon.cpp
#	ggml/src/ggml-hexagon/htp/htp-ctx.h
#	ggml/src/ggml-hexagon/htp/htp-ops.h
#	ggml/src/ggml-hexagon/htp/htp_iface.idl
#	ggml/src/ggml-hexagon/htp/main.c
#	ggml/src/ggml-webgpu/ggml-webgpu-shader-lib.hpp
#	ggml/src/ggml-webgpu/ggml-webgpu.cpp
#	ggml/src/ggml-webgpu/wgsl-shaders/mul_mat_decls.tmpl
#	scripts/jinja/jinja-tester.py
#	scripts/snapdragon/adb/run-cli.sh
#	scripts/snapdragon/adb/run-completion.sh
#	scripts/sync_vendor.py
#	tests/test-backend-ops.cpp

tools/server/server-context.cpp

@@ -680,6 +680,7 @@ private:
     // slots / clients
     std::vector<server_slot> slots;
 
+    int trace = 0;
     int slots_debug = 0;
     int n_empty_consecutive = 0;
 
@@ -918,12 +919,21 @@ private:
             slot.reset();
         }
 
+        {
+            const char * LLAMA_TRACE = getenv("LLAMA_TRACE");
+            trace = LLAMA_TRACE ? atoi(LLAMA_TRACE) : 0;
+
+            if (trace) {
+                SRV_WRN("LLAMA_TRACE = %d\n", trace);
+            }
+        }
+
         {
             const char * LLAMA_SERVER_SLOTS_DEBUG = getenv("LLAMA_SERVER_SLOTS_DEBUG");
             slots_debug = LLAMA_SERVER_SLOTS_DEBUG ? atoi(LLAMA_SERVER_SLOTS_DEBUG) : 0;
 
             if (slots_debug) {
-                SRV_WRN("slots debug = %d\n", slots_debug);
+                SRV_WRN("LLAMA_SERVER_SLOTS_DEBUG = %d\n", slots_debug);
             }
         }
 
@@ -2974,13 +2984,15 @@ private:
                     auto accepted = common_sampler_sample_and_accept_n(slot.smpl.get(), slot.ctx, slot.spec_i_batch, slot.spec_draft);
                     slot.spec_i_batch.clear();
 
-                    SLT_DBG(slot, "%s: n_draft=%zu, accepted=%zu\n", __func__, slot.spec_draft.size(), accepted.size());
-
                     GGML_ASSERT(accepted.size() >= 1);
 
                     // check for partial draft acceptance
                     if (accepted.size() < slot.spec_draft.size() + 1) {
                         if (use_ckpt) {
+                            if (trace > 0) {
+                                SLT_INF(slot, "accepted %2zu/%2zu draft tokens (restore checkpoint)\n", accepted.size() - 1, slot.spec_draft.size());
+                            }
+
                             // partial acceptance is not supported by the context -> truncate the draft and restore the state
                             slot.spec_draft = std::move(accepted);
 
@@ -3002,8 +3014,10 @@ private:
 
                             continue;
                         }
+                    }
 
-                        LOG_DBG("%s: partial acceptance: %zu < %zu\n", __func__, accepted.size(), slot.spec_draft.size());
+                    if (trace > 0) {
+                        SLT_INF(slot, "accepted %2zu/%2zu draft tokens\n", accepted.size() - 1, n_draft);
                     }
 
                     common_speculative_accept(slot.spec.get(), accepted.size() - 1);