experiments: add test script for e2e bg topology

experiments/pyexps/e2e_bg.py

+# Copyright 2023 Max Planck Institute for Software Systems, and
+# National University of Singapore
+#
+# Permission is hereby granted, free of charge, to any person obtaining
+# a copy of this software and associated documentation files (the
+# "Software"), to deal in the Software without restriction, including
+# without limitation the rights to use, copy, modify, merge, publish,
+# distribute, sublicense, and/or sell copies of the Software, and to
+# permit persons to whom the Software is furnished to do so, subject to
+# the following conditions:
+#
+# The above copyright notice and this permission notice shall be
+# included in all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+# IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+# CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+# TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+# SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+import random
+import simbricks.orchestration.experiments as exp
+import simbricks.orchestration.nodeconfig as node
+import simbricks.orchestration.simulators as sim
+import simbricks.orchestration.e2e_components as e2e
+from simbricks.orchestration.simulator_utils import create_tcp_cong_hosts
+from simbricks.orchestration.e2e_topologies import (
+    DCFatTree, add_contig_bg
+)
+
+random.seed(42)
+
+e = exp.Experiment('e2e_bg')
+
+options = {
+    'ns3::TcpSocket::SegmentSize': '1448',
+    'ns3::TcpSocket::SndBufSize': '524288',
+    'ns3::TcpSocket::RcvBufSize': '524288',
+    'ns3::Ipv4GlobalRouting::RandomEcmpRouting': '1',
+}
+
+topology = DCFatTree(
+            n_spine_sw=2,
+            n_agg_bl=2,
+            n_agg_sw=1,
+            n_agg_racks=2,
+            h_per_rack=1,
+        )
+add_contig_bg(topology)
+
+net = sim.NS3E2ENet()
+net.opt = ' '.join([f'--{o[0]}={o[1]}' for o in options.items()])
+net.add_component(topology)
+net.wait = True
+e.add_network(net)
+
+experiments = [e]