Grinding in a Cluster in Visual Studio .NET

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Grinding in a Cluster
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Test Series 1212 - Three Servers
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As the Troops had reached a hard limit on the tests, they decided to add one more server into the cluster and see how it behaved Grace is added into the mix by changing the following line in the weblogic properties file of the proxy:
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defaultServers=sara:7001:7002|eva:7001:7002|grace:7001:7002
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Test 12121 - 280 Users
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The first test with three servers is done with 280 users and the results are: Test 12121 url0 urll url2 url3 url4 url5 url6 url7 url8 Total ART 16583 12007 13636 13134 13276 16270 22270 28977 27683 163836 TPS 603 833 733 761 753 615 449 345 361 061
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Comparing this response time with the one obtained from Test 12112 presents a decrease of about 37%, due to the overhead of running the extra server However, it still is about 30% better than the corresponding run in 11 with only one server
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Below you can see a snapshot of the console, presenting all three servers in similar conditions and capable of handling more load
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The following graph shows the CPU usage of Grace (similar to Eva and Sara), which is relatively busy, but with room for more
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Grinding in a Cluster
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Test 12122 - 320 Users
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The next test increases the number of users by 40 to total 320 users The results are the following: Test 12122 url0 urll url2 url3 url4 url5 url6 url7 url8
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28682 20052 48663 53647 59166 640,26 66858 66855 80218 488166
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TPS 349 499 205 186 169 156
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150 150 125
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By just adding 40 users the response time has increased by 280%, from 1638 ms There were no errors, but we are reaching a threshold The database must be overwhelmed with requests, but not quite enough to start producing errors Whereas the WebLogic servers and the proxy exhibit a normal behavior, the database server shows a high usage of CPU as can be seen here:
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Test 12123 - 400 users
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As expected, this run with 400 users had a large number of errors, 288 Again all of them are directly traceable to the database The CPU usage of Maria is quite heavy, as can be seen in the following screenshot:
The rest of the data from the execution of the WebLogic servers and the proxy remains within acceptable ranges showing that more load could be handled easily The results of this run are: Test 12123 url0 urll url2 url3 url4 url5 url6 url7 url8 ART 26425 21196 53880 55259 66128 76623 81470 72625 74468 528075 IPS 378 472 186 181 151 131 123 138 134 019
Total
Test 1213 - Failure
The next test is focused on understanding how failover works For this the Troops decide to test using 3 servers and 280 users Just when the test is in the second half of the second cycle they pull the network connection from Grace effectively removing it from the cluster
Grinding in a Cluster
What happens next is that all the activity suddenly stops for the next 160 seconds, after which it ramps up again and continues up to the end of the test The reason it takes this amount of time is related to the TCP/IP stack parameters, specifically the socket timeouts The tests were made with the default values for these parameters on the NT operating system Setting smaller values for the timeout parameters can make the proxy react sooner and the cluster recover more quickly On the other hand, small values for timeouts allows the proxy to mark a server 'unavailable' when in reality it is just busy at that point in time The latter approach could make the cluster more vulnerable under heavy load As the Troops have clearly identified when the failure occurs, they proceed to conduct an analysis of the response times for every cycle, which can be found in the following table: Test 1213 url0 urll url2 url3 url4 url5 url6 url7 url8 Total Cycle 0 5030 2490 14555 17768 14938 16797 27129 36621 51001 186329 Cycle 1 35271 28551 75012 77330 261399 893925 1439513 1943803 2327999 7082803 Cycle 2 2231676 424711 720568 152719 42029 33105 28598 22221 22520 3678146
The first cycle has a decent response time, considering that the optimizer of the JVM has not started producing results Compared to the previous test, where the response time is averaged over the three cycles that make up the test, there is a difference of only 225 milliseconds As expected, the response time for the second cycle increases dramatically, since this is where the failure occurs On the third cycle the response time improves substantially, almost halving