Add memory usage tool

Summary:
Tool measures memory usage per one vertex, per one edge,
and per one vertex by adding a new label to it.

Reviewers: florijan, buda

Reviewed By: florijan

Subscribers: pullbot

Differential Revision: https://phabricator.memgraph.io/D973

tools/memory_usage.py

@@ -0,0 +1,88 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+
+import time
+import sys  
+import os
+
+# hackish way to resuse existing start code
+sys.path.append("../tests/macro_benchmark/")
+from databases import *
+from clients import *
+from common import get_absolute_path
+
+def avg_no_label_node_size(memgraph, client, measure_points):
+    node_size_sum = 0
+    NODE_CREATION = "UNWIND RANGE(1, {}) AS _ CREATE ()"
+
+    for node_size in measure_points:
+        memgraph.start()
+
+        idle_memory = memgraph.database_bin.get_usage()['memory']
+        client([NODE_CREATION.format(node_size)], memgraph)
+        current_memory = memgraph.database_bin.get_usage()['memory'] 
+        bytes_per_node = (current_memory - idle_memory) * 1024. / node_size
+        node_size_sum += bytes_per_node
+        memgraph.stop()
+
+    return node_size_sum / len(measure_points)
+
+def avg_label_on_node_size(memgraph, client, measure_points):
+    label_on_node_size_sum  = 0
+    NODE_CREATION = "UNWIND RANGE(1, {}) AS _ CREATE ()"
+    NODE_WITH_LABEL_CREATION = "UNWIND RANGE(1, {}) AS _ CREATE (n{})"
+    LABEL_SIZE = 5
+
+    for node_cnt in measure_points:
+        for label_count in range(1, LABEL_SIZE+1):
+            memgraph.start()
+            client([NODE_CREATION.format(node_cnt)], memgraph)
+            idle_memory = memgraph.database_bin.get_usage()['memory']
+            memgraph.stop()
+
+            memgraph.start()
+            labels = "".join(":L" + str(i) for i in range(label_count))
+            client([NODE_WITH_LABEL_CREATION.format(node_cnt, labels)], memgraph)
+            current_memory = memgraph.database_bin.get_usage()['memory'] 
+
+            bytes_per_node = (current_memory - idle_memory) * 1024. / node_cnt / label_count
+            label_on_node_size_sum += bytes_per_node
+
+            memgraph.stop()
+
+    return label_on_node_size_sum / (len(measure_points) * LABEL_SIZE)
+
+def avg_edge_size(memgraph, client, measure_points):
+    edge_size_sum = 0
+    EDGE_CREATION = "CREATE (a) WITH a UNWIND range(1, {}) AS _ CREATE (a)-[:Edge]->(a)"
+
+    for edge_cnt in measure_points:
+        memgraph.start()
+
+        idle_memory = memgraph.database_bin.get_usage()['memory']
+        client([EDGE_CREATION.format(edge_cnt)], memgraph)
+        current_memory = memgraph.database_bin.get_usage()['memory'] 
+        bytes_per_edge = (current_memory - idle_memory) * 1024. / edge_cnt
+        edge_size_sum += bytes_per_edge
+        memgraph.stop()
+
+    return edge_size_sum / len(measure_points)
+
+def main():
+    path = get_absolute_path("benchmarking.conf", "config")
+
+    memgraph = Memgraph(None, path, 1)
+    client = QueryClient(None, 1)
+
+    measure_points = [10**6, 2*10**6, 5*10**6, 10*10**6]
+    no_label_node_size = avg_no_label_node_size(memgraph, client, measure_points)
+    label_on_node_size = avg_label_on_node_size(memgraph, client, measure_points)
+    edge_size = avg_edge_size(memgraph, client, measure_points)
+    
+    print("Expected node without label size (Bytes): ", no_label_node_size)
+    print("Expected label addition to node (Bytes): ", label_on_node_size)
+    print("Expected edge size (Bytes): ", edge_size)
+
+if __name__ == "__main__":
+    main()