caching on zos

WebSphere Foundation Family

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April 11, 2023

Websphere Caching on zOS

Architect: Rohit Kelapure Advisory Software Engineer Dynacache/DRS Team Lead and Architect


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Dynamic Caching

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WebSphere Application Server Dynacache Service Summary

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Provides core caching infrastructure for Base and ND WAS products.

Operates in JVM Memory and/or Disk

Distributed replication support for “expensive to recreate” entries

Access via J2EE APIs or cachespec.xml

Caches at multiple tiers• Servlets/Portlets/JSPs page

• Struts and Tiles responses

• WebSphere Commands

• Web Services (Server & Client)

• Java Objects (Distributed Maps)

Supports multiple cache instances

Enhanced disk cache

Works on ALL platforms including zOS

Replication across cells and coregroups.

Interoperates with External Caches



End to End Caching with WebSphere zOS


Caching goes beyond an applications' own infrastructure



WebSphere External Caching

Cache static and Dynamic Content at the Edge

– Web Server plugin Edge Side Include (ESI) cache

– Using WebSphere Caching Proxy




zOS web server plugin ESI cache Static file caching

– Plugin-cfg.xmlo <Property Name="ESIEnable" Value="true"/> o <Property Name="ESIMaxCacheSize" Value="10240"/> (10 MB)o <Property Name="ESIInvalidationMonitor" Value=“true"/>

Dynamic Caching– Caching of a whole page and its' fragments .




ZOS FRCA Cache* new in v7

Requests served from the FRCA cache are about 8% the cost of requests served from the Dynamic Cache Reduction in CP and ZAAP CPU% leading to cost savingsDisplay FRCA cache statistics

o From MVS console: f <serverName>,display,frca o From MVS console: display tcpip,,netstat,cach o From TSO: netstat cach




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Monitoring Servlet, Command & WebServices cache instances

– CacheMonitor application shipped with WAS install in the installableApps dir.o Provides

Real-time view of the current state of dynamic cache Verify the configuration of dynamic cache Verify the cache policies Monitor cache statistics Monitor the data flowing through the cache Monitor the data in the edge cache View the data offloaded to the disk Manage the data in the cache

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Administration & Monitoring Object Cache instances– Extended Cache Monitor

– http://www.ibm.com/developerworks/websphere/downloads/cache_monitor.html

– Provides two functions that are not available with the cache monitor Display the contents of object cache i.e. distributedmap i.e. POJO cache instances. Display the Dynamic Cache mbean statistics for cache instances across all members of the cluster. Installed as an update to the existing CacheMonitor application. All Dynacache customers that use the DistributedMap API leverage the ECM in development and production.

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Dynacache mbean for runtime controlo Dynacache Runtime mbean operations:

getCacheSize getUsedCacheSize getDiskOverflow getCacheStatisticNames getCacheInstanceNames getAllCacheStatistics getCacheStatistics getCacheIDsInMemory getCacheIDsOnDisk getCacheIDsInPushPullTable getCacheEntry invalidateCacheIDs clearCache getCacheDigest compareCaches getStats

o DynaCache Runtime mbean attributes: cacheSize usedCacheSize diskOverflow stats

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Cache Policies The Cachespec.xml is a deployable,

XML cache policy file that contains configuration entries for caching

definitions and rules for Servlet/JSP/ JSTL/ Portlet caching

Allows application developers to specify: What is going to be cached (Servlets, JSP, Java

commands, web services etc.) Where it is going to be cached (memory or disk) When cache items are to be evicted (invalidation) How cache entries are related (invalidation

dependencies).

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Why Dynacache ? Differentiation

– zOS only caching features like FRCA leveraging native platform abilities.

Performance & Cost– Significant potential to reduce CP & zAAP CPU utilization & reduce response time.

Completeness– Caching at all tiers of the zOS platform (Webserver, CR and SR regions)

– Caching different types of objects from POJOs, EJB, Servlet, Portlet & WebServices responses.

High Availability – Replication ability to keep caches consistent across cells and clusters

Persistence:– Industry leading disk cache persistence capability.

Consumability– Drop in performance improvements by adding cachespec.xml to the application.

– APIs implementing java.util.Map interface leading to easy developer adoption.

Customized for increases QOS– Integration with in memory data grids like WebSphere eXtreme Scale.

Stability: – Employed by customers in production since WebSphere 3.5.




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Thanks

April 11, 2023

caching on zos

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