Database Reference
In-Depth Information
ConcurrentThreads += 200 or
Zero
Round = 6
ConcurrentThreads = 100
Init concurrent
threads
Start
True
Fire all the threads,
3 request will be sent continuously
within every thread
Wait for all the
threads finish
(Round--) > 0
False
Read all the records from memory,
export to CSV file
End
Fig. 4.2
The flow chart of evaluation strategies
images, and etc, would be stored and retrieved from the cloud. Understanding
the characteristics of cloud and associated network behavior in handling big data
is an important contribution towards improving the ability to better utilize cloud
computing to handle such data.
Load Test Strategies
The CARE framework supports two types of load test strategies: high stress test
strategy and low stress test strategy. The different load test strategies are applied
across the various test scenarios listed in Sect. 4.1 , in order to provide a more
comprehensive evaluation and comparison.
The low stress test strategy sends multiple requests from the end-user side in a
sequential manner. This is appropriate for simulating systems where there is a single
or small number of end-users. It also provides a reference point for comparison to
the high stress test strategy and also for obtaining base network latency benchmarks.
The high stress test strategy provides simulated concurrent requests to cloud
platforms in order to obtain key insights on the cloud architecture, particularly for
observing performance behavior under load.
Figure 4.2 illustrates the workflow of the high stress test strategy. The config-
urable parameter called repeating rounds is set to 6 by default. This represents
the warm-up period, where there is typically a large performance variation due
to certain phenomena such as cloud connection time. The performance results
arising from the warm-up time stage are discarded by the performance results
compilation framework, in order to produce more repeatable and stable testing
results. Another configurable parameter concurrent threads is set to start at 100
 
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