static auto message = std::string("message");
mailbox->put(&message, 1e10);
double end_time = simgrid::s4u::Engine::get_clock();
- XBT_INFO(" Actual result: Sending 10Gb with bw=%.0eb, lat=%.0es takes %f seconds (TCP_Gamma=%.0f).",
+ XBT_INFO(" Actual result: Sending 10Gb with bw=%.0eb, lat=%.0es lasts %f seconds (TCP_Gamma=%.0f).",
testlink->get_bandwidth(), testlink->get_latency(), end_time - start_time,
simgrid::config::get_value<double>("network/TCP-gamma"));
});
/* We need a separate actor so that it can sleep after each test */
static void main_dispatcher()
{
- XBT_INFO("TEST: When the latency is 0, the communication takes 1 sec");
- XBT_INFO(" ");
+ XBT_INFO("-----------------------------------------------------------");
+ XBT_INFO("This test set enforces the impact of the latency and TCP-gamma parameter on the bandwidth.");
+ XBT_INFO("See the documentation about the CM02 TCP performance model.");
+ XBT_INFO("-----------------------------------------------------------");
+ XBT_INFO("TEST with latency = 0 sec (and the default value of Gamma):");
+ XBT_INFO(" Expectation: Gamma/2lat is not defined, so the physical bandwidth is used; The communication lasts 1 sec.");
run_ping_test();
XBT_INFO("-----------------------------------------------------------");
testlink->set_latency(0.00001);
XBT_INFO("TEST with latency = 0.00001 sec");
- XBT_INFO(" Gamma/2lat is about 209 Gb/s, which is larger than the physical bandwidth.");
- XBT_INFO(" So communication is limited by the physical bandwidth and takes 1.00001 sec.\n");
+ XBT_INFO(" Expectation: Gamma/2lat is about 209 Gb/s, which is larger than the physical bandwidth.");
+ XBT_INFO(" So communication is limited by the physical bandwidth and lasts 1.00001 sec.");
run_ping_test();
XBT_INFO("-----------------------------------------------------------");
testlink->set_latency(0.001);
XBT_INFO("TEST with latency = 0.001 sec");
- XBT_INFO(" Gamma/2lat is about 2 Gb/s, which is smaller than the physical bandwidth.");
- XBT_INFO(" So the communication is limited by the latency and takes 4.768372 + 0.001 sec.\n");
+ XBT_INFO(" Expectation: Gamma/2lat is about 2 Gb/s, which is smaller than the physical bandwidth.");
+ XBT_INFO(" So the communication is limited by the latency and lasts 4.768372 + 0.001 sec.");
run_ping_test();
XBT_INFO("-----------------------------------------------------------");
testlink->set_latency(0.1);
XBT_INFO("TEST with latency = 0.1 sec");
- XBT_INFO(" Gamma/2lat is about 2 Gb/s, which is smaller than the physical bandwidth.");
- XBT_INFO(" So the communication is limited by the latency and takes 476.837158 + 0.1 sec.\n");
+ XBT_INFO(" Expectation: Gamma/2lat is about 2 Gb/s, which is smaller than the physical bandwidth.");
+ XBT_INFO(" So the communication is limited by the latency and lasts 476.837158 + 0.1 sec.");
run_ping_test();
XBT_INFO("-----------------------------------------------------------");
XBT_INFO("TEST with latency = 0.001 sec and TCP_Gamma = 0");
sg4::Engine::set_config("network/TCP-gamma:0");
testlink->set_latency(0.001);
- XBT_INFO(" The latency=0.001s should make the communication to be limited by the latency, but since gamma=0, the "
- "physical bandwidth is still used.");
- XBT_INFO(" So the communication takes 1.001 sec.\n");
+ XBT_INFO(" Expectation: The latency=0.001s should make the communication to be limited by the latency.");
+ XBT_INFO(" But since gamma=0, the physical bandwidth is still used. So the communication lasts 1.001 sec.");
run_ping_test();
XBT_INFO("-----------------------------------------------------------");
}
$ ${bindir:=.}/cm02-tcpgamma --log=root.fmt=%m%n --cfg=network/model:CM02
> [0.000000] [xbt_cfg/INFO] Configuration change: Set 'network/crosstraffic' to '0'
> Configuration change: Set 'network/model' to 'CM02'
-> TEST: When the latency is 0, the communication takes 1 sec
->
-> Actual result: Sending 10Gb with bw=1e+10b, lat=0e+00s takes 1.000000 seconds (TCP_Gamma=4194304).
+> -----------------------------------------------------------
+> This test set enforces the impact of the latency and TCP-gamma parameter on the bandwidth.
+> See the documentation about the CM02 TCP performance model.
+> -----------------------------------------------------------
+> TEST with latency = 0 sec (and the default value of Gamma):
+> Expectation: Gamma/2lat is not defined, so the physical bandwidth is used; The communication lasts 1 sec.
+> Actual result: Sending 10Gb with bw=1e+10b, lat=0e+00s lasts 1.000000 seconds (TCP_Gamma=4194304).
> -----------------------------------------------------------
> TEST with latency = 0.00001 sec
-> Gamma/2lat is about 209 Gb/s, which is larger than the physical bandwidth.
-> So communication is limited by the physical bandwidth and takes 1.00001 sec.
->
-> Actual result: Sending 10Gb with bw=1e+10b, lat=1e-05s takes 1.000010 seconds (TCP_Gamma=4194304).
+> Expectation: Gamma/2lat is about 209 Gb/s, which is larger than the physical bandwidth.
+> So communication is limited by the physical bandwidth and lasts 1.00001 sec.
+> Actual result: Sending 10Gb with bw=1e+10b, lat=1e-05s lasts 1.000010 seconds (TCP_Gamma=4194304).
> -----------------------------------------------------------
> TEST with latency = 0.001 sec
-> Gamma/2lat is about 2 Gb/s, which is smaller than the physical bandwidth.
-> So the communication is limited by the latency and takes 4.768372 + 0.001 sec.
->
-> Actual result: Sending 10Gb with bw=1e+10b, lat=1e-03s takes 4.769372 seconds (TCP_Gamma=4194304).
+> Expectation: Gamma/2lat is about 2 Gb/s, which is smaller than the physical bandwidth.
+> So the communication is limited by the latency and lasts 4.768372 + 0.001 sec.
+> Actual result: Sending 10Gb with bw=1e+10b, lat=1e-03s lasts 4.769372 seconds (TCP_Gamma=4194304).
> -----------------------------------------------------------
> TEST with latency = 0.1 sec
-> Gamma/2lat is about 2 Gb/s, which is smaller than the physical bandwidth.
-> So the communication is limited by the latency and takes 476.837158 + 0.1 sec.
->
-> Actual result: Sending 10Gb with bw=1e+10b, lat=1e-01s takes 476.937158 seconds (TCP_Gamma=4194304).
+> Expectation: Gamma/2lat is about 2 Gb/s, which is smaller than the physical bandwidth.
+> So the communication is limited by the latency and lasts 476.837158 + 0.1 sec.
+> Actual result: Sending 10Gb with bw=1e+10b, lat=1e-01s lasts 476.937158 seconds (TCP_Gamma=4194304).
> -----------------------------------------------------------
> TEST with latency = 0.001 sec and TCP_Gamma = 0
> Configuration change: Set 'network/TCP-gamma' to '0'
-> The latency=0.001s should make the communication to be limited by the latency, but since gamma=0, the physical bandwidth is still used.
-> So the communication takes 1.001 sec.
->
-> Actual result: Sending 10Gb with bw=1e+10b, lat=1e-03s takes 1.001000 seconds (TCP_Gamma=0).
+> Expectation: The latency=0.001s should make the communication to be limited by the latency.
+> But since gamma=0, the physical bandwidth is still used. So the communication lasts 1.001 sec.
+> Actual result: Sending 10Gb with bw=1e+10b, lat=1e-03s lasts 1.001000 seconds (TCP_Gamma=0).
> -----------------------------------------------------------
\ No newline at end of file
