Integrated Research in GRID Computing- P8:The deployment process for adaptive Grid applications does not finish when the application is started. Several activities have to be performed while the application is active, and actually the deployment system must rely on at least one permanent process or daemon. | 128 INTEGRATED RESEARCH IN GRID COMPUTING 100 UJ 80 6 a 60 J c 40 2 s X 20 IMPACT OF FAULTS ----Added 1 Added 2 Completed 1 Completed 2 s. Probability of fault appearance Figure 2. FCI fault-injection results corrected data and the at-most-once semantics has been followed in the execution of the SOAP service. This was the synthetic application that has been used in the experiments that will be described herein. Other Web-Services and Grid Services are currently under assessment by the QUAKE tool. The testing infrastructure was composed by a cluster with 12 machines running Linux and Java . The SOAP service was running on a central node dual-processor of the cluster and we have use a Tomcat-AXIS server running on top of Linux. As far as we know most of the Java-based Web-Services and Grid-Services are currently using Tomcat-Axis so we were interested to evaluate the robustness of this middleware. From those 12 machines one was running the SUT application other was dedicated to the BMS system and the remaining 10 machines were running instances of the clients that were in practice the workload generators. For these results herein presented we have chosen the following parameters 1 Default configuration parameters of the JVM Tomcat and Axis. 2 The Tomcat JVM was running with the implicit Java garbage-collector. 3 In the overall the client machines will send 1 million of SOAP requests. 4 The request will follow the continuous-burst distribution. Fault-injection and Dependability Benchmarking 129 5 There are no retransmission of SOAP requests when a client gets a response error. This way there are no repeated messages and the at-most-once semantics is not violated 6 No fault-load is introduced in the SUT system. We ran the SOAP services in a dedicated server and all the operating system resources were available to the application. This means we are testing a Web-Service in a normal environment with any perturbations at the system-level. The results of the first .
