网络延迟测试结果

测试环境（PC1装了N多软件，响应相当慢）

PC1  Win7 32位      
        
         Intel 2.10GH双核           
内存2G         
NAT

PC2  Windows Server 64位     Intel Xeon 2.50GHz
24核内存16G      
公网IP（xxx.xxx.xx.xxx）

Test11(延迟):
PC1两进程互传

Test12(延迟):
PC1->PC2（运行1000次取平均值）

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URPipe：不可靠模式双向管道

RPipe：可靠模式双向管道

mcast：组播(JxtaMulticastSocket)

socket：基于流的接口（JxtaServerSocket/JxtaSocket，对本项目影响不大，由于时间关系，没有进行测试）

单位：毫秒；表格中的数值是RTT(Round Trip Time)往返时间，计算单程时间减半。

Test11是在PC1上的两进程互传，可以近似看做是在同一个局域网中。

其中URPipe的时间明显小于RPipe的时间，但比起Tcp和Udp仍然较大。

比较出乎意料的是mcast，其RTT值将近3秒，这个以前没有注意过。

Test12是从PC1向PC2发送消息，然后PC2在收到消息后马上将消息返回给PC1所消耗的时间。测试结果与Test11基本相同，除了各项数值普遍要大一些。

另外一个现象值得注意：

在PC1上，对于双向管道，当使用连续密集发送100消息，延迟会逐渐增大到1s以上而使用不可靠模式时，丢包现象比较严重，发了100个消息，最后只收到40个消息。

在PC2上，对于双向管道，当使用连续密集发送100消息，延迟只增大到100ms级；而且使用不可靠模式时，基本没有丢包现象。

看来我的电脑确实该扔了。。。

——————————————————————————————————————————————————

感觉延迟虽然会对系统有一定影响，但还不是最关键的因素，对于流媒体来说，一定程度的延迟是可以接受的。

上面的测试结果可以作为参考，由于测试过程比较随意，因此不是很精确。

本来想多次发消息取平均值可能更科学一些，但在PC1上连续发消息很多次后，延迟很快增长到若干秒，感觉失去了测试的意义，就此作罢。。。

——————————————————————————————————————————————————

感觉延迟虽然会对系统有一定影响，但还不是最关键的因素，对于流媒体来说，一定程度的延迟是可以接受的。

上面的测试结果可以作为参考，由于测试过程比较随意，因此不是很精确。

本来想多次发消息取平均值可能更科学一些，但在PC1上连续发消息很多次后，延迟很快增长到若干秒（发送1000次时最高达到5秒），感觉测试的意义不大，就此作罢。。。

——————————————————————————————————————————————————

好吧，针对连续密集发送，可能之前的测试代码有问题，做如下改进后，看来好了很多

1 在循环外分配内存（原来在循环内分配内存）

2 每次发送消息后线程休眠100ms

下面是测试结果（可靠双向管道每次只发送1字节数据，第一列是序号，第二列是RTT）

seq=1, 31

seq=2, 16

seq=3, 14

seq=4, 15

seq=5, 17

seq=6, 12

seq=7, 21

seq=8, 19

seq=9, 13

seq=10, 10

seq=11, 21

seq=12, 22

seq=13, 16

seq=14, 9

seq=15, 9

seq=16, 8

seq=17, 19

seq=18, 29

seq=19, 26

seq=20, 19

seq=21, 9

seq=22, 9

seq=23, 11

seq=24, 11

seq=25, 9

seq=26, 11

seq=27, 8

seq=28, 14

seq=29, 8

seq=30, 15

seq=31, 10

seq=32, 40

seq=33, 16

seq=34, 8

seq=35, 8

seq=36, 13

seq=37, 19

seq=38, 16

seq=39, 16

seq=40, 8

seq=41, 8

seq=42, 8

seq=43, 8

seq=44, 34

seq=45, 15

seq=46, 19

seq=47, 8

seq=48, 8

seq=49, 28

seq=50, 9

seq=51, 10

seq=52, 15

seq=53, 9

seq=54, 12

seq=55, 8

seq=56, 8

seq=57, 23

seq=58, 31

seq=59, 10

seq=60, 7

seq=61, 8

seq=62, 21

seq=63, 8

seq=64, 16

seq=65, 7

seq=66, 11

seq=67, 7

seq=68, 8

seq=69, 8

seq=70, 39

seq=71, 9

seq=72, 23

seq=73, 10

seq=74, 9

seq=75, 29

seq=76, 9

seq=77, 8

seq=78, 17

seq=79, 9

seq=80, 9

seq=81, 11

seq=82, 7

seq=83, 37

seq=84, 7

seq=85, 9

seq=86, 10

seq=87, 10

seq=88, 41

seq=89, 20

seq=90, 10

seq=91, 31

seq=92, 9

seq=93, 11

seq=94, 7

seq=95, 22

seq=96, 35

seq=97, 24

seq=98, 8

seq=99, 9

seq=100, 7

seq=101, 38

seq=102, 32

seq=103, 6

seq=104, 9

seq=105, 10

seq=106, 10

seq=107, 7

seq=108, 40

seq=109, 22

seq=110, 10

seq=111, 26

seq=112, 25

seq=113, 8

seq=114, 9

seq=115, 6

seq=116, 8

seq=117, 10

seq=118, 10

seq=119, 13

seq=120, 23

seq=121, 7

seq=122, 12

seq=123, 7

seq=124, 34

seq=125, 9

seq=126, 9

seq=127, 20

seq=128, 10

seq=129, 7

seq=130, 6

seq=131, 12

seq=132, 13

seq=133, 9

seq=134, 8

seq=135, 6

seq=136, 9

seq=137, 37

seq=138, 8

seq=139, 13

seq=140, 9

seq=141, 7

seq=142, 7

seq=143, 22

seq=144, 6

seq=145, 8

seq=146, 10

seq=147, 9

seq=148, 19

seq=149, 12

seq=150, 6

seq=151, 30

seq=152, 8

seq=153, 21

seq=154, 8

seq=155, 11

seq=156, 25

seq=157, 26

seq=158, 9

seq=159, 8

seq=160, 7

seq=161, 8

seq=162, 9

seq=163, 11

seq=164, 22

seq=165, 16

seq=166, 6

seq=167, 13

seq=168, 7

seq=169, 13

seq=170, 18

seq=171, 9

seq=172, 8

seq=173, 7

seq=174, 7

seq=175, 19

seq=176, 33

seq=177, 24

seq=178, 7

seq=179, 7

seq=180, 9

seq=181, 19

seq=182, 6

seq=183, 10

seq=184, 6

seq=185, 6

seq=186, 8

seq=187, 11

seq=188, 19

seq=189, 7

seq=190, 8

seq=191, 7

seq=192, 7

seq=193, 11

seq=194, 24

seq=195, 8

seq=196, 6

seq=197, 6

seq=198, 12

seq=199, 10

seq=200, 9

seq=201, 7

seq=202, 6

seq=203, 9

seq=204, 9

seq=205, 15

seq=206, 6

seq=207, 7

seq=208, 6

seq=209, 9

seq=210, 6

seq=211, 13

seq=212, 21

seq=213, 6

seq=214, 8

seq=215, 7

seq=216, 6

seq=217, 6

seq=218, 7

seq=219, 14

seq=220, 6

seq=221, 8

seq=222, 21

seq=223, 8

seq=224, 12

seq=225, 6

seq=226, 6

seq=227, 13

seq=228, 6

seq=229, 7

seq=230, 6

seq=231, 7

seq=232, 7

seq=233, 7

seq=234, 9

seq=235, 30

seq=236, 8

seq=237, 7

seq=238, 8

seq=239, 7

seq=240, 7

seq=241, 9

seq=242, 7

seq=243, 41

seq=244, 10

seq=245, 10

seq=246, 7

seq=247, 8

seq=248, 27

seq=249, 15

seq=250, 10

seq=251, 9

seq=252, 6

seq=253, 6

seq=254, 7

seq=255, 22

seq=256, 10

seq=257, 9

seq=258, 9

seq=259, 8

seq=260, 8

seq=261, 38

seq=262, 7

seq=263, 7

seq=264, 7

seq=265, 10

seq=266, 9

seq=267, 17

seq=268, 6

seq=269, 9

seq=270, 8

seq=271, 11

seq=272, 6

seq=273, 31

seq=274, 9

seq=275, 7

seq=276, 9

seq=277, 7

seq=278, 8

seq=279, 7

seq=280, 6

seq=281, 23

seq=282, 26

seq=283, 9

seq=284, 6

seq=285, 11

seq=286, 9

seq=287, 6

seq=288, 8

seq=289, 8

seq=290, 8

seq=291, 23

seq=292, 11

seq=293, 7

seq=294, 7

seq=295, 8

seq=296, 35

seq=297, 11

seq=298, 24

seq=299, 9

seq=300, 23

seq=301, 9

seq=302, 8

seq=303, 19

seq=304, 37

seq=305, 12

seq=306, 6

seq=307, 8

seq=308, 6

seq=309, 7

seq=310, 11

seq=311, 14

seq=312, 12

seq=313, 10

seq=314, 11

seq=315, 10

seq=316, 9

seq=317, 10

seq=318, 6

seq=319, 25

seq=320, 23

seq=321, 7

seq=322, 7

seq=323, 10

seq=324, 21

seq=325, 6

seq=326, 6

seq=327, 7

seq=328, 26

seq=329, 28

seq=330, 6

seq=331, 8

seq=332, 6

seq=333, 18

seq=334, 17

seq=335, 34

seq=336, 17

seq=337, 29

seq=338, 10

seq=339, 7

seq=340, 6

seq=341, 12

seq=342, 18

seq=343, 13

seq=344, 8

seq=345, 8

seq=346, 25

seq=347, 8

seq=348, 18

seq=349, 8

seq=350, 15

seq=351, 17

seq=352, 19

seq=353, 8

seq=354, 9

seq=355, 7

seq=356, 8

seq=357, 7

seq=358, 30

seq=359, 19

seq=360, 12

seq=361, 10

seq=362, 7

seq=363, 6

seq=364, 9

seq=365, 17

seq=366, 18

seq=367, 7

seq=368, 9

seq=369, 14

seq=370, 20

seq=371, 14

seq=372, 23

seq=373, 9

seq=374, 7

seq=375, 22

seq=376, 8

seq=377, 9

seq=378, 6

seq=379, 8

seq=380, 9

seq=381, 7

seq=382, 7

seq=383, 6

seq=384, 16

seq=385, 41

seq=386, 13

seq=387, 7

seq=388, 6

seq=389, 7

seq=390, 9

seq=391, 7

seq=392, 9

seq=393, 9

seq=394, 8

seq=395, 8

seq=396, 6

seq=397, 8

seq=398, 7

seq=399, 8

seq=400, 15

seq=401, 9

seq=402, 9

seq=403, 7

seq=404, 6

seq=405, 7

seq=406, 10

seq=407, 7

seq=408, 9

seq=409, 7

seq=410, 8

seq=411, 11

seq=412, 8

seq=413, 12

seq=414, 8

seq=415, 8

seq=416, 13

seq=417, 6

seq=418, 11

seq=419, 6

seq=420, 13

seq=421, 11

seq=422, 12

seq=423, 7

seq=424, 9

seq=425, 9

seq=426, 7

seq=427, 8

seq=428, 9

seq=429, 7

seq=430, 10

seq=431, 7

seq=432, 13

seq=433, 7

seq=434, 9

seq=435, 8

seq=436, 6

seq=437, 10

seq=438, 8

seq=439, 10

seq=440, 9

seq=441, 6

seq=442, 8

seq=443, 10

seq=444, 9

seq=445, 7

seq=446, 8

seq=447, 10

seq=448, 32

seq=449, 10

seq=450, 7

seq=451, 11

seq=452, 9

seq=453, 7

seq=454, 8

seq=455, 6

seq=456, 12

seq=457, 6

seq=458, 11

seq=459, 6

seq=460, 8

seq=461, 6

seq=462, 7

seq=463, 10

seq=464, 18

seq=465, 7

seq=466, 12

seq=467, 7

seq=468, 10

seq=469, 6

seq=470, 8

seq=471, 27

seq=472, 20

seq=473, 8

seq=474, 8

seq=475, 29

seq=476, 24

seq=477, 17

seq=478, 13

seq=479, 8

seq=480, 6

seq=481, 6

seq=482, 10

seq=483, 7

seq=484, 15

seq=485, 32

seq=486, 19

seq=487, 19

seq=488, 18

seq=489, 10

seq=490, 9

seq=491, 12

seq=492, 30

seq=493, 7

seq=494, 8

seq=495, 17

seq=496, 9

seq=497, 6

seq=498, 7

seq=499, 11

seq=500, 6

seq=501, 6

seq=502, 15

seq=503, 9

seq=504, 12

seq=505, 6

seq=506, 10

seq=507, 6

seq=508, 6

seq=509, 13

seq=510, 12

seq=511, 37

seq=512, 12

seq=513, 8

seq=514, 8

seq=515, 8

seq=516, 8

seq=517, 23

seq=518, 6

seq=519, 6

seq=520, 7

seq=521, 6

seq=522, 5

seq=523, 25

seq=524, 21

seq=525, 12

seq=526, 9

seq=527, 6

seq=528, 6

seq=529, 6

seq=530, 8

seq=531, 7

seq=532, 43

seq=533, 9

seq=534, 8

seq=535, 6

seq=536, 7

seq=537, 19

seq=538, 7

seq=539, 9

seq=540, 7

seq=541, 12

seq=542, 9

seq=543, 16

seq=544, 8

seq=545, 9

seq=546, 11

seq=547, 8

seq=548, 5

seq=549, 7

seq=550, 10

seq=551, 9

seq=552, 6

seq=553, 22

seq=554, 7

seq=555, 9

seq=556, 20

seq=557, 9

seq=558, 7

seq=559, 9

seq=560, 6

seq=561, 29

seq=562, 7

seq=563, 8

seq=564, 6

seq=565, 11

seq=566, 7

seq=567, 8

seq=568, 6

seq=569, 10

seq=570, 6

seq=571, 36

seq=572, 10

seq=573, 20

seq=574, 7

seq=575, 9

seq=576, 24

seq=577, 15

seq=578, 6

seq=579, 8

seq=580, 8

seq=581, 9

seq=582, 10

seq=583, 24

seq=584, 21

seq=585, 6

seq=586, 9

seq=587, 19

seq=588, 28

seq=589, 15

seq=590, 6

seq=591, 9

seq=592, 9

seq=593, 6

seq=594, 25

seq=595, 8

seq=596, 6

seq=597, 12

seq=598, 27

seq=599, 7

seq=600, 21

seq=601, 11

seq=602, 5

seq=603, 18

seq=604, 28

seq=605, 11

seq=606, 15

seq=607, 17

seq=608, 26

seq=609, 8

seq=610, 15

seq=611, 11

seq=612, 19

seq=613, 43

seq=614, 6

seq=615, 14

seq=616, 6

seq=617, 6

seq=618, 6

seq=619, 9

seq=620, 6

seq=621, 10

seq=622, 6

seq=623, 6

seq=624, 11

seq=625, 8

seq=626, 6

seq=627, 15

seq=628, 6

seq=629, 8

seq=630, 12

seq=631, 19

seq=632, 28

seq=633, 9

seq=634, 9

seq=635, 5

seq=636, 28

seq=637, 27

seq=638, 10

seq=639, 9

seq=640, 7

seq=641, 8

seq=642, 6

seq=643, 6

seq=644, 27

seq=645, 10

seq=646, 21

seq=647, 6

seq=648, 6

seq=649, 6

seq=650, 25

seq=651, 6

seq=652, 7

seq=653, 6

seq=654, 18

seq=655, 11

seq=656, 24

seq=657, 7

seq=658, 6

seq=659, 6

seq=660, 14

seq=661, 9

seq=662, 9

seq=663, 6

seq=664, 25

seq=665, 15

seq=666, 13

seq=667, 11

seq=668, 21

seq=669, 16

seq=670, 21

seq=671, 7

seq=672, 8

seq=673, 9

seq=674, 7

seq=675, 30

seq=676, 18

seq=677, 10

seq=678, 9

seq=679, 18

seq=680, 9

seq=681, 11

seq=682, 32

seq=683, 6

seq=684, 11

seq=685, 6

seq=686, 10

seq=687, 7

seq=688, 9

seq=689, 6

seq=690, 8

seq=691, 7

seq=692, 44

seq=693, 6

seq=694, 6

seq=695, 7

seq=696, 7

seq=697, 11

seq=698, 8

seq=699, 6

seq=700, 10

seq=701, 7

seq=702, 28

seq=703, 6

seq=704, 6

seq=705, 6

seq=706, 10

seq=707, 10

seq=708, 8

seq=709, 16

seq=710, 6

seq=711, 22

seq=712, 8

seq=713, 33

seq=714, 7

seq=715, 11

seq=716, 21

seq=717, 31

seq=718, 7

seq=719, 22

seq=720, 6

seq=721, 7

seq=722, 9

seq=723, 10

seq=724, 6

seq=725, 21

seq=726, 14

seq=727, 32

seq=728, 10

seq=729, 8

seq=730, 8

seq=731, 20

seq=732, 25

seq=733, 26

seq=734, 7

seq=735, 13

seq=736, 10

seq=737, 26

seq=738, 24

seq=739, 21

seq=740, 20

seq=741, 10

seq=742, 12

seq=743, 18

seq=744, 6

seq=745, 6

seq=746, 6

seq=747, 10

seq=748, 10

seq=749, 19

seq=750, 38

seq=751, 21

seq=752, 21

seq=753, 10

seq=754, 7

seq=755, 51

seq=756, 7

seq=757, 7

seq=758, 6

seq=759, 8

seq=760, 6

seq=761, 13

seq=762, 11

seq=763, 14

seq=764, 11

seq=765, 13

seq=766, 7

seq=767, 15

seq=768, 5

seq=769, 39

seq=770, 20

seq=771, 5

seq=772, 6

seq=773, 6

seq=774, 9

seq=775, 29

seq=776, 8

seq=777, 6

seq=778, 14

seq=779, 27

seq=780, 6

seq=781, 14

seq=782, 9

seq=783, 6

seq=784, 34

seq=785, 17

seq=786, 6

seq=787, 20

seq=788, 20

seq=789, 13

seq=790, 8

seq=791, 16

seq=792, 12

seq=793, 6

seq=794, 7

seq=795, 7

seq=796, 6

seq=797, 36

seq=798, 6

seq=799, 20

seq=800, 8

seq=801, 8

seq=802, 15

seq=803, 6

seq=804, 9

seq=805, 18

seq=806, 8

seq=807, 6

seq=808, 6

seq=809, 10

seq=810, 13

seq=811, 28

seq=812, 15

seq=813, 11

seq=814, 9

seq=815, 7

seq=816, 10

seq=817, 7

seq=818, 8

seq=819, 9

seq=820, 6

seq=821, 10

seq=822, 10

seq=823, 9

seq=824, 8

seq=825, 6

seq=826, 34

seq=827, 22

seq=828, 6

seq=829, 6

seq=830, 6

seq=831, 35

seq=832, 9

seq=833, 6

seq=834, 5

seq=835, 7

seq=836, 18

seq=837, 21

seq=838, 6

seq=839, 7

seq=840, 6

seq=841, 16

seq=842, 9

seq=843, 20

seq=844, 6

seq=845, 6

seq=846, 11

seq=847, 28

seq=848, 7

seq=849, 19

seq=850, 13

seq=851, 9

seq=852, 9

seq=853, 11

seq=854, 12

seq=855, 6

seq=856, 7

seq=857, 11

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seq=859, 10

seq=860, 10

seq=861, 9

seq=862, 7

seq=863, 8

seq=864, 6

seq=865, 8

seq=866, 6

seq=867, 13

seq=868, 12

seq=869, 6

seq=870, 9

seq=871, 6

seq=872, 8

seq=873, 22

seq=874, 27

seq=875, 15

seq=876, 5

seq=877, 6

seq=878, 8

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seq=880, 7

seq=881, 8

seq=882, 7

seq=883, 8

seq=884, 5

seq=885, 6

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seq=887, 6

seq=888, 6

seq=889, 10

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seq=891, 21

seq=892, 7

seq=893, 6

seq=894, 6

seq=895, 6

seq=896, 10

seq=897, 7

seq=898, 5

seq=899, 8

seq=900, 9

seq=901, 39

seq=902, 8

seq=903, 7

seq=904, 9

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seq=908, 7

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seq=911, 7

seq=912, 9

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seq=915, 8

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seq=926, 6

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seq=930, 23

seq=931, 7

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seq=937, 5

seq=938, 7

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seq=940, 9

seq=941, 35

seq=942, 8

seq=943, 11

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seq=946, 6

seq=947, 26

seq=948, 6

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seq=950, 16

seq=951, 27

seq=952, 8

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seq=954, 7

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seq=956, 12

seq=957, 6

seq=958, 42

seq=959, 7

seq=960, 7

seq=961, 8

seq=962, 8

seq=963, 6

seq=964, 6

seq=965, 7

seq=966, 24

seq=967, 10

seq=968, 7

seq=969, 7

seq=970, 11

seq=971, 7

seq=972, 11

seq=973, 6

seq=974, 8

seq=975, 14

seq=976, 6

seq=977, 6

seq=978, 22

seq=979, 7

seq=980, 7

seq=981, 7

seq=982, 9

seq=983, 10

seq=984, 6

seq=985, 25

seq=986, 6

seq=987, 9

seq=988, 34

seq=989, 6

seq=990, 5

seq=991, 9

seq=992, 9

seq=993, 9

seq=994, 13

seq=995, 25

seq=996, 7

seq=997, 7

seq=998, 6

seq=999, 20

seq=1000, 5