Server Performance Tuning

Consider server configuration properties when tuning performance. You can tune performance immediately after installing Unwired Server. Or you can tune it as part of regular system administration duties in an ongoing capacity.

Ensure that all applicable performance-related settings are properly configured:

Java heap size – when the garbage collection log indicates high activity and the JVM memory allocation pool heap size remains close to the maximum, you may need to reconfigure the maximum and minimum heap sizes. You can enable garbage collection tracing by setting the "JVM options" property. Set appropriate maximum and minimum heap sizes in the Server Configuration node of Sybase Control Center. The default minimum heap size is 64MB and the default maximum heap size is 256MB. See Sybase Control Center online help > Configure > Configuring Unwired Platform > Unwired Server > Server Properties > General Server Ports > Configuring System Performance Properties.
Java thread stack size – if you see a StackOverflowError, you may need to increase the default stack size from 400KB. Set an appropriate Java thread stack size in the Server Configuration node of Sybase Control Center. Alternatively, you can also decrease the stack size to save more memory. See Sybase Control Center online help > Configure > Configuring Unwired Platform > Unwired Server > Server Properties > General Server Ports > Configuring System Performance Properties.
Messaging-based synchronization (MBS) – if there are large numbers of MBS clients and response times or queue counts are high, consider the inbound and outbound messaging queue counts. These numbers control the number of message queues used for incoming and outgoing messages between the messaging-based synchronization application and the server. If you increase either of these values, ensure you also increase the maxThreads property of in the <hostname>_iiop1.properties file.
View messaging queue statistics in the Monitoring node of Sybase Control Center to calculate the appropriate values and enter these in the Server Configuration node of Sybase Control Center. See Sybase Control Center online help > Configure > Configuring Unwired Platform > Unwired Server > Server Properties > General Server Ports > Configuring System Performance Properties.
Replication-based synchronization (RBS) – if RBS client application performance does not meet the desired level and the CPU or memory settings are not causing this issue, consider increasing the synchronization thread count and cache size for the RBS server. Choose an appropriate synchronization cache size and thread count in the Server Configuration node of Sybase Control Center. See Sybase Control Center online help> Configure > Configuring Unwired Platform > Unwired Server > Server Properties > Replication > Configuring Replication-Based Synchronization Properties.
Consolidated database (CDB) – if the CDB server is slow, consider increasing the CDB thread count to allow for more parallel threads to serve incoming requests from the Unwired Server nodes. See Changing the Consolidated Database Server Thread Count. Also consider tuning the number of client connections that are saved in the CDB connection pool. Configure this in the 'default' domain by modifying the 'default' data source pool size property in Sybase Control Center. Repeat this change on all nodes in the cluster.
Data change notification (DCN) listener threads – if there are a large number of concurrent requests and processing times for those requests do not meet requirements, consider increasing the number of DCN listener threads. Set an appropriate number of listener threads in the Server Configuration node of Sybase Control Center. See Sybase Control Center online help > Configure > Configuring Unwired Platform > Unwired Server > Server Properties > General Server Ports > Configuring Communication Port Properties.
Server host memory – if you are running Unwired Server on a host with 4GB of memory, by default, 2GB of memory is allocated to applications, such as Unwired Server. If performance issues persist after you have adjusted the aforementioned settings, consider starting Windows with a "/3GB" switch. See http://technet.microsoft.com/en-us/library/bb124810(EXCHG.65).aspx.

Note:

For Java min/max heap size, and Java thread stack size properties, once you make the change you must restart Unwired Server.

For more information:

See topics in System Administration > Systems Administration > Server Environment Administration > Server Administration Overview. For recommendations, see Configuring System Performance Properties.
See the Sybase Unwired Platform Performance and Tuning white paper: http://www.sybase.com/files/White_Papers/Sybase_SUP_1.5.2_Perf_and_Tuning_WP.pdf.