[8u] RFR 8259886: Improve SSL session cache performance and scalability

[He Dongbo(JVM)]

/Hi, //////Original Bug: https://bugs.openjdk.java.net/browse/JDK-8259886 
<https://bugs.openjdk.java.net/browse/JDK-8259886> / ////https://hg.openjdk.java.net/jdk-updates/jdk11u-dev/rev/82a5dca5c57c 
<https://hg.openjdk.java.net/jdk-updates/jdk11u-dev/rev/82a5dca5c57c> ///Patch does not apply to 8u cleanly, because we need to remove the //microbenchmark that//doesn't exist in 8u./////8u webrev: /http://cr.openjdk.java.net/~dongbohe/8259886/webrev.01/ 
<http://cr.openjdk.java.net/~dongbohe/8259886/webrev.01/> The following 
is the performance data on my machine. JMH: CacheBench.put 20480 86400 
avgt 25 125214.877 ± 771.891 ns/op CacheBench.put 20480 0 avgt 25 
130.827 ± 4.886 ns/op CacheBench.put 204800 86400 avgt 25 1421192.003 ± 
10492.641 ns/op CacheBench.put 204800 0 avgt 25 205.607 ± 9.081 ns/op 
CacheBench.put 5120000 86400 avgt 25 426789424.874 ± 56051669.301 ns/op 
CacheBench.put 5120000 0 avgt 25 1694.398 ± 178.005 ns/op after patch: 
CacheBench.put 20480 0 avgt 25 135.425 ± 4.609 ns/op CacheBench.put 
204800 86400 avgt 25 281.704 ± 10.688 ns/op CacheBench.put 204800 0 avgt 
25 220.617 ± 10.616 ns/op CacheBench.put 5120000 86400 avgt 25 1803.882 
± 220.730 ns/op CacheBench.put 5120000 0 avgt 25 1748.993 ± 245.926 
ns/op tomcat+jmeter:/
//summary + 431008 in 00:00:06 = 71846.6/s Avg: 12 Min: 0 Max: 500 Err: 
0 (0.00%) Active: 1000 Started: 1000 Finished: 0 summary = 72392845 in 
00:16:54 = 71365.9/s Avg: 12 Min: 0 Max: 1155 Err: 0 (0.00%) summary + 
415424 in 00:00:06 = 69237.3/s Avg: 12 Min: 0 Max: 499 Err: 0 (0.00%) 
Active: 1000 Started: 1000 Finished: 0 summary = 72808269 in 00:17:00 = 
71353.4/s Avg: 12 Min: 0 Max: 1155 Err: 0 (0.00%) summary + 422887 in 
00:00:06 = 70481.2/s Avg: 12 Min: 0 Max: 619 Err: 0 (0.00%) Active: 1000 
Started: 1000 Finished: 0 summary = 73231156 in 00:17:06 = 71348.3/s 
Avg: 12 Min: 0 Max: 1155 Err: 0 (0.00%) summary + 415679 in 00:00:06 = 
69279.8/s Avg: 13 Min: 0 Max: 517 Err: 0 (0.00%) Active: 1000 Started: 
1000 Finished: 0 summary = 73646835 in 00:17:12 = 71336.3/s Avg: 12 Min: 
0 Max: 1155 Err: 0 (0.00%) summary + 397989 in 00:00:06 = 66276.3/s Avg: 
14 Min: 0 Max: 507 Err: 0 (0.00%) Active: 1000 Started: 1000 Finished: 
0/ after patch:///summary + 671589 in 00:00:06 = 111931.5/s Avg: 2 Min: 0 Max: 132 Err: 
0 (0.00%) Active: 1000 Started: 1000 Finished: 0 summary = 101709661 in 
00:16:43 = 101436.1/s Avg: 2 Min: 0 Max: 1378 Err: 0 (0.00%) summary + 
618923 in 00:00:06 = 102965.1/s Avg: 1 Min: 0 Max: 127 Err: 0 (0.00%) 
Active: 1000 Started: 1000 Finished: 0 summary = 102328584 in 00:16:49 = 
101445.1/s Avg: 2 Min: 0 Max: 1378 Err: 0 (0.00%) summary + 624735 in 
00:00:06 = 104331.2/s Avg: 1 Min: 0 Max: 200 Err: 0 (0.00%) Active: 1000 
Started: 1000 Finished: 0 summary = 102953319 in 00:16:55 = 101462.1/s 
Avg: 2 Min: 0 Max: 1378 Err: 0 (0.00%) summary + 576132 in 00:00:06 = 
95766.6/s Avg: 1 Min: 0 Max: 154 Err: 0 (0.00%) Active: 1000 Started: 
1000 Finished: 0 summary = 103529451 in 00:17:01 = 101428.6/s Avg: 2 
Min: 0 Max: 1378 Err: 0 (0.00%) summary + 529216 in 00:00:06 = 88438.5/s 
Avg: 1 Min: 0 Max: 128 Err: 0 (0.00%) Active: 1000 Started: 1000 
Finished: 0/ //////Testing: Linux x86_64 tier1. /

-- 
thanks,
hedongbo