9.2. Throughput Benchmark¶

Latency measurements are provided for two different environments:

Xeon – End-to-End latency measured on high-performance Xeon machines in a dedicated network using the RTI Connext DDS Performance Test tool.
Raspberry Pi – Round-trip latencies measured on stock Raspberry Pi’s in a dedicated network using the RTI Connext DDS Performance Test tool.

The throughput is measured by sending as fast as possible. The subscriber measures the throughput results.

Interpretation of the measurements:

Length - The size of the DDS sample payload (UDP overhead is not included)
Total Samples - The number of samples written.
Ave Samples/s - The number of samples written per second.
Ave Mbps - The bandwidth utilization for the payload based on Length and Samples/sec.
Lost Samples - On the subscriber side the number of samples received is counted against what is expected.
Lost Samples % - Percentage of Lost Samples compared to the Total Samples.

9.2.1. Xeon¶

The end-to-end latency is measured between two identical machines using the test configuration below and running the RTI Connext DDS Performance Test tool.

The test environment consists of:

x86_64 CentOS Linux release 7.1.1503
RTI Perftest 3.0
Switch Configuration: D-Link DXS-3350 SR:
- 176Gbps Switching Capacity
- Dual 10-Gig stacking ports and optional 10-Gig uplinks
- Stacks up to 8 units per stack
- 4MB (Packet Buffer Size)
- 48 x 10/100/1000BASE-T ports
Machine:
- Intel I350 Gigabit NIC
- Intel Core i7 CPU:
  - 12MB cache
  - 6 Cores (12 threads)
  - 3.33 GHz CPU speed
- 12GB memory

9.2.1.1. C++ Best Effort Keyed 1 Gbps¶

Length	Total Samples	Ave Samples/s	Ave Mbps	Lost Samples	Lost Samples %
32	16044363	267348	68.4	4498829	21.90
64	16288384	271414	139.0	3937652	19.47
128	16544680	275683	282.3	3364334	16.90
256	15012642	250180	512.4	3461644	18.74
1024	6389009	106476	872.3	0	0.00
4096	1766545	29440	964.7	0	0.00
8192	899145	14984	982.0	0	0.00
63000	118019	1966	991.3	0	0.00

9.2.1.2. C++ Best Effort Unkeyed 1 Gbps¶

Length	Total Samples	Ave Samples/s	Ave Mbps	Lost Samples	Lost Samples %
32	16006959	266723	68.3	4975838	23.71
64	15669477	261101	133.7	5688987	26.64
128	16035834	267206	273.6	3696902	18.73
256	14506332	241748	495.1	5127339	26.12
1024	6522231	108698	890.5	0	0.00
4096	1776531	29607	970.2	0	0.00
8192	901733	15028	984.9	0	0.00
63000	118065	1967	991.7	0	0.00

9.2.2. Raspberry Pi¶

The throughput is measured between two identical machines using the test configuration below and running the RTI Connext DDS Performance Test tool.

The test environment consists of:

2 x Raspberry Pi 4 Model B
1 Gbps network

9.2.2.1. C++ Best Effort Keyed 1 Gbps¶

Length	Total Samples	Ave Samples/s	Ave Mbps	Lost Samples	Lost Samples %
32	1029281	34286	8.8	86039	7.71
64	1002008	33383	17.1	103991	9.40
128	1003392	33424	34.2	105887	9.55
256	1010662	33667	69.0	97505	8.80
512	999412	33293	136.4	95499	8.72
1024	1005618	33503	274.5	70438	6.55
8192	373512	12444	815.5	4490	1.19
63000	57066	1901	958.2	4	0.01

9.2.2.2. C++ Best Effort Unkeyed 1 Gbps¶

Length	Total Samples	Ave Samples/s	Ave Mbps	Lost Samples	Lost Samples %
32	1075843	35848	9.2	28865	2.61
64	1078018	35921	18.4	46836	4.16
128	1075975	35846	36.7	49085	4.36
256	1051393	35032	71.7	71874	6.40
512	1056848	35206	144.2	38693	3.53
1024	1014000	33786	276.8	65777	6.09
8192	368939	12293	805.7	2060	0.56
63000	57094	1902	958.6	2	0.00

9.2.2.3. C++ Reliable Keyed 1 Gbps¶

Length	Total Samples	Ave Samples/s	Ave Mbps	Lost Samples	Lost Samples %
32	897966	29921	7.7	0	0.00
64	900673	30011	15.4	90	0.01
128	911776	30382	31.1	90	0.01
256	904006	30122	61.7	320	0.04
512	889059	29626	121.3	443	0.05
1024	885718	29513	241.8	95	0.01
8192	101075	3366	220.6	516764	83.64
63000	31038	1032	520.3	173185	84.80

9.2.2.4. C++ Reliable Unkeyed 1 Gbps¶

Length	Total Samples	Ave Samples/s	Ave Mbps	Lost Samples	Lost Samples %
32	910317	30332	7.8	0	0.00
64	907643	30244	15.5	0	0.00
128	906586	30209	30.9	0	0.00
256	905877	30184	61.8	0	0.00
512	895232	29830	122.2	0	0.00
1024	887834	29584	242.4	0	0.00
8192	115887	3860	253.0	166745	59.00
63000	56024	1866	940.5	604	1.07