router2: additional heatmap data

Author: Ravenslofty

common/route/router2.cc

@@ -1159,7 +1159,7 @@ struct Router2
         return success;
     }
 
-    void write_wiretype_heatmap(std::ostream &out)
+    void write_congestion_by_wiretype_heatmap(std::ostream &out)
     {
         dict<IdString, std::vector<int>> cong_by_type;
         size_t max_cong = 0;
@@ -1185,6 +1185,33 @@ struct Router2
         }
     }
 
+    void write_utilisation_by_wiretype_heatmap(std::ostream &out)
+    {
+        dict<IdString, int> util_by_type;
+        for (auto &wd : flat_wires) {
+            IdString type = ctx->getWireType(wd.w);
+            if (wd.curr_cong > 0)
+                util_by_type[type] += wd.curr_cong;
+        }
+        // Write csv
+        for (auto &u : util_by_type)
+            out << u.first.c_str(ctx) << "," << u.second << std::endl;
+    }
+
+    void write_congestion_by_coordinate_heatmap(std::ostream &out)
+    {
+        auto util_by_coord = std::vector<std::vector<int>>(ctx->getGridDimX() + 1, std::vector<int>(ctx->getGridDimY() + 1, 0));
+        for (auto &wd : flat_wires)
+            if (wd.curr_cong > 1)
+                util_by_coord[wd.x][wd.y] += wd.curr_cong;
+        // Write csv
+        for (auto &x : util_by_coord) {
+            for (auto y : x)
+                out << y << ",";
+            out << std::endl;
+        }
+    }
+
     int mid_x = 0, mid_y = 0;
 
     void partition_nets()
@@ -1444,12 +1471,30 @@ struct Router2
             update_congestion();
 
             if (!cfg.heatmap.empty()) {
-                std::string filename(cfg.heatmap + "_" + std::to_string(iter) + ".csv");
-                std::ofstream cong_map(filename);
-                if (!cong_map)
-                    log_error("Failed to open wiretype heatmap %s for writing.\n", filename.c_str());
-                write_wiretype_heatmap(cong_map);
-                log_info("        wrote wiretype heatmap to %s.\n", filename.c_str());
+                {
+                    std::string filename(cfg.heatmap + "_congestion_by_wiretype_" + std::to_string(iter) + ".csv");
+                    std::ofstream cong_map(filename);
+                    if (!cong_map)
+                        log_error("Failed to open congestion-by-wiretype heatmap %s for writing.\n", filename.c_str());
+                    write_congestion_by_wiretype_heatmap(cong_map);
+                    log_info("        wrote congestion-by-wiretype heatmap to %s.\n", filename.c_str());
+                }
+                {
+                    std::string filename(cfg.heatmap + "_utilisation_by_wiretype_" + std::to_string(iter) + ".csv");
+                    std::ofstream cong_map(filename);
+                    if (!cong_map)
+                        log_error("Failed to open utilisation-by-wiretype heatmap %s for writing.\n", filename.c_str());
+                    write_utilisation_by_wiretype_heatmap(cong_map);
+                    log_info("        wrote utilisation-by-wiretype heatmap to %s.\n", filename.c_str());
+                }
+                {
+                    std::string filename(cfg.heatmap + "_congestion_by_coordinate_" + std::to_string(iter) + ".csv");
+                    std::ofstream cong_map(filename);
+                    if (!cong_map)
+                        log_error("Failed to open congestion-by-coordinate heatmap %s for writing.\n", filename.c_str());
+                    write_congestion_by_coordinate_heatmap(cong_map);
+                    log_info("        wrote congestion-by-coordinate heatmap to %s.\n", filename.c_str());
+                }
             }
             int tmgfail = 0;
             if (timing_driven)

python/plot_congestion_by_coordinate.py

@@ -0,0 +1,27 @@
+import csv
+import sys
+
+import matplotlib.pyplot as plt
+
+data = []
+
+file = 1
+try:
+    while True:
+        print("{}/heatmap_congestion_by_coordinate_{}.csv".format(sys.argv[1], file))
+        with open("{}/heatmap_congestion_by_coordinate_{}.csv".format(sys.argv[1], file)) as f:
+            file_data = []
+            reader = csv.reader(f, delimiter=',')
+            for row in reader:
+                file_data.append([float(x) for x in row if x != ''])
+            data.append(file_data)
+        file += 1
+except FileNotFoundError:
+    pass
+
+for i, file_data in enumerate(data):
+    plt.imshow(file_data, cmap="gray", aspect="equal")
+    plt.title("heatmap for iteration {}".format(i+1))
+    plt.tight_layout()
+    plt.savefig("{}/heatmap_congestion_by_coordinate_{:03}.png".format(sys.argv[1], i), dpi=300)
+    plt.clf()

python/plot_congestion_by_wiretype.py

@@ -0,0 +1,56 @@
+import csv
+import sys
+
+import matplotlib.pyplot as plt
+
+data = {}
+max_bars = {}
+
+file = 1
+try:
+    while True:
+        print("{}/heatmap_congestion_by_wiretype_{}.csv".format(sys.argv[1], file))
+        with open("{}/heatmap_congestion_by_wiretype_{}.csv".format(sys.argv[1], file)) as f:
+            reader = csv.reader(f, delimiter=',')
+            for row in [x for x in reader][1:]:
+                key = row[0]
+                values = [float(x) for x in row[1:] if x != '']
+                # Ignore wires without overuse
+                values[0] = 0
+                values[1] = 0
+                if key not in data:
+                    data[key] = []
+                    max_bars[key] = 0
+                data[key].append(values)
+                max_bars[key] = max(max_bars[key], len(values))
+            file += 1
+except FileNotFoundError:
+    pass
+finally:
+    file -= 1
+
+to_remove = []
+for key in data.keys():
+    if sum([sum(values) for values in data[key]]) == 0:
+        # Prune entries that never have any overuse to attempt to reduce visual clutter
+        to_remove.append(key)
+    else:
+        # Pad entries as needed
+        for values in data[key]:
+            while len(values) < max_bars[key]:
+                values.append(0)
+for key in to_remove:
+    del data[key]
+
+COLS = 2
+for i in range(file):
+    plt.suptitle("heatmap for iteration {}".format(i))
+    fig, axs = plt.subplots((len(data.keys())+(COLS-1))//COLS, COLS)
+    for j, key in enumerate(data.keys()):
+        if sum(data[key][i]) > 0:
+            axs[j//COLS, j%COLS].bar([x for x in range(len(data[key][i]))], data[key][i])
+            axs[j//COLS, j%COLS].set_title(key)
+        else:
+            axs[j//COLS, j%COLS].set_axis_off()
+    plt.savefig("{}/heatmap_congestion_by_wiretype_{:03}.png".format(sys.argv[1], i), dpi=300)
+    plt.close()