roofline: emit per-launch topology edges for graph reconstruction

ggml/src/ggml-cuda/ggml-cuda-roofline.cpp

@@ -24,6 +24,7 @@
 #include <cxxabi.h>
 
 #include <algorithm>
+#include <array>
 #include <atomic>
 #include <cstdint>
 #include <cstdio>
@@ -80,6 +81,27 @@ struct dispatch {
     uint64_t duration_ns = 0;
 };
 
+// Per-launch identity for graph reconstruction: the geometry record is shared across ops of the
+// same shape, so only these ids distinguish repeated layers. Ids are storage ids at the view_src
+// root, so a read of a view/reshape (which launches no kernel and has no row) still resolves to the
+// producing op. The consumer links each in_storage_id to the last prior launch whose out_storage_id
+// matches (last writer wins, which also resolves in-place ops).
+// One entry per external source (aligned 1:1 with in_storage_ids). Holds each operand's own
+// name/type/shape so the consumer can label and classify it (weight vs dynamic input, by name) --
+// which a fused row's head-only geometry record can't supply.
+struct src_operand {
+    std::string name;
+    std::string type;             // ggml_type_name
+    int64_t     ne[4] = {0, 0, 0, 0};
+};
+
+struct node_topology {
+    uint64_t                  out_storage_id = 0;
+    std::vector<uint64_t>     in_storage_ids;
+    std::vector<src_operand>  in_operands;   // aligned with in_storage_ids
+    std::string               name;
+};
+
 std::mutex                                           g_mutex;
 std::unordered_map<uint64_t, op_record>              g_records;      // geometry id -> geometry
 std::unordered_map<uint64_t, uint64_t>               g_invocations;  // invocation id -> geometry id
@@ -92,6 +114,7 @@ std::unordered_map<uint64_t, int64_t>                g_invocation_experts;  // i
 // (token, slot) routings that selected expert e; Σ = n_tokens*top_k). Emitted as tokens_per_expert
 // so the consumer can show the routing-load distribution (skew that drives MoE-GEMM padding).
 std::unordered_map<uint64_t, std::vector<int32_t>>   g_invocation_expert_hist;  // invocation id -> per-expert token counts
+std::unordered_map<uint64_t, node_topology>          g_invocation_topology;     // invocation id -> per-launch identity (edges)
 std::atomic<uint64_t>                                g_next_invocation{1};
 thread_local uint64_t                                g_current_invocation = 0;  // id pushed by the last begin_op on this thread
 
@@ -180,6 +203,18 @@ const ggml_tensor * roofline_storage(const ggml_tensor * t) {
     return t;
 }
 
+// Capture one source operand's identity (name/type/shape) for the topology, so the consumer can
+// label and classify it directly. The name is taken from the storage root (a view of a model
+// weight keeps the weight's name), which is what makes weight-vs-input unambiguous.
+src_operand make_src_operand(const ggml_tensor * t) {
+    src_operand op;
+    const ggml_tensor * root = roofline_storage(t);
+    op.name = root && root->name[0] ? root->name : (t->name[0] ? t->name : "");
+    op.type = ggml_type_name(t->type);
+    for (int d = 0; d < 4; d++) op.ne[d] = t->ne[d];
+    return op;
+}
+
 // Fill a record's geometry and single-node HBM byte fields from one ggml node.
 void fill_head_record(op_record & rec, const ggml_tensor * node) {
     const ggml_tensor * src0 = node->src[0];
@@ -384,7 +419,41 @@ void write_report() {
         if (!first) out << ",\n";
         first = false;
 
-        out << "    {\"ggml_op\": \"" << rec.op << "\", ";
+        out << "    {\"ggml_op\": \"" << rec.op << "\", \"invocation\": " << invocation << ", ";
+        // Per-launch identity for graph reconstruction: sort rows by invocation for execution
+        // order, then link each in_tensor_id to the producing launch's out_tensor_id.
+        auto topo_it = g_invocation_topology.find(invocation);
+        if (topo_it != g_invocation_topology.end()) {
+            out << "\"name\": \"";
+            json_escape(out, topo_it->second.name);
+            out << "\", \"out_storage_id\": " << topo_it->second.out_storage_id << ", \"in_storage_ids\": [";
+            for (size_t j = 0; j < topo_it->second.in_storage_ids.size(); j++) {
+                if (j) out << ", ";
+                out << topo_it->second.in_storage_ids[j];
+            }
+            out << "], ";
+            // Per-operand identity aligned 1:1 with in_storage_ids: the tensor name (unambiguous
+            // weight-vs-input), its dtype and its shape -- correct even for a fused span's non-head
+            // operands, which the shared geometry record's head-only src arrays do not describe.
+            const auto & ops = topo_it->second.in_operands;
+            out << "\"in_names\": [";
+            for (size_t j = 0; j < ops.size(); j++) {
+                if (j) out << ", ";
+                out << "\""; json_escape(out, ops[j].name); out << "\"";
+            }
+            out << "], \"in_types\": [";
+            for (size_t j = 0; j < ops.size(); j++) {
+                if (j) out << ", ";
+                out << "\"" << ops[j].type << "\"";
+            }
+            out << "], \"in_ne\": [";
+            for (size_t j = 0; j < ops.size(); j++) {
+                if (j) out << ", ";
+                out << "[" << ops[j].ne[0] << ", " << ops[j].ne[1] << ", "
+                    << ops[j].ne[2] << ", " << ops[j].ne[3] << "]";
+            }
+            out << "], ";
+        }
         if (!rec.fused_nodes.empty()) {
             out << "\"fused_ops\": [";
             for (size_t k = 0; k < rec.fused_nodes.size(); k++) {
@@ -541,6 +610,7 @@ void ggml_cuda_roofline_reset(void) {
     g_invocations.clear();
     g_dispatches.clear();
     g_invocation_experts.clear();
+    g_invocation_topology.clear();
     // g_next_invocation stays monotonic so a late warmup record cannot collide with a
     // post-reset invocation id; g_kernel_names is kept (code objects do not reload).
 }
@@ -579,10 +649,23 @@ void ggml_cuda_roofline_begin_op(const struct ggml_tensor * node, void * stream)
         if (!hist.empty()) g_invocation_expert_hist[invocation] = std::move(hist);
     }
 
+    // Per-launch identity for graph edges (overridden by fuse_ops for a fused span). Resolve to
+    // storage roots so consumers of a view/reshape of this output still link back here.
+    node_topology topo;
+    topo.out_storage_id = (uint64_t) (uintptr_t) roofline_storage(node);
+    topo.name           = node->name;
+    for (int j = 0; j < GGML_MAX_SRC; j++) {
+        if (node->src[j]) {
+            topo.in_storage_ids.push_back((uint64_t) (uintptr_t) roofline_storage(node->src[j]));
+            topo.in_operands.push_back(make_src_operand(node->src[j]));
+        }
+    }
+
     {
         std::lock_guard<std::mutex> lock(g_mutex);
         g_invocations.emplace(invocation, geometry_id);
         if (g_records.find(geometry_id) == g_records.end()) g_records.emplace(geometry_id, rec);
+        g_invocation_topology.emplace(invocation, std::move(topo));
     }
 
     // Tag the kernels launched until the next op with this invocation id. rocprofiler
@@ -632,10 +715,34 @@ void ggml_cuda_roofline_fuse_ops(const struct ggml_cgraph * cgraph, int node_idx
         for (int d = 0; d < 4; d++) geometry_id = hash_mix(geometry_id, (uint64_t) n->ne[d]);
     }
 
+    // Rebuild the launch identity for the whole span: the group produces the last node's output,
+    // and reads only storages not written within the span (internal tensors are elided). Storage
+    // roots so a src that views an internal output is recognised as internal.
+    std::unordered_set<uint64_t> internal;
+    for (int j = node_idx; j < node_idx + node_count; ++j) {
+        internal.insert((uint64_t) (uintptr_t) roofline_storage(cgraph->nodes[j]));
+    }
+    node_topology topo;
+    topo.out_storage_id = (uint64_t) (uintptr_t) roofline_storage(cgraph->nodes[node_idx + node_count - 1]);
+    topo.name           = head->name;
+    std::unordered_set<uint64_t> seen;
+    for (int j = node_idx; j < node_idx + node_count; ++j) {
+        const ggml_tensor * n = cgraph->nodes[j];
+        for (int s = 0; s < GGML_MAX_SRC; s++) {
+            if (!n->src[s]) continue;
+            const uint64_t sid = (uint64_t) (uintptr_t) roofline_storage(n->src[s]);
+            if (!internal.count(sid) && seen.insert(sid).second) {
+                topo.in_storage_ids.push_back(sid);
+                topo.in_operands.push_back(make_src_operand(n->src[s]));
+            }
+        }
+    }
+
     // Re-point the current invocation at the fused record. The provisional head-only record
     // from begin_op stays in g_records; if no non-fused invocation references it, it is
     // simply never emitted (the report iterates g_invocations).
     std::lock_guard<std::mutex> lock(g_mutex);
     g_invocations[g_current_invocation] = geometry_id;
     if (g_records.find(geometry_id) == g_records.end()) g_records.emplace(geometry_id, std::move(rec));
+    g_invocation_topology[g_current_invocation] = std::move(topo);
 }