The document details key tools for debugging Dynacache issues in IBM's WebSphere software, including cache monitors and statistics collectors. It highlights real-time monitoring capabilities and the importance of cache statistics for optimizing performance. Additional tools such as the Dynacache runtime mbean and extended cache monitor are mentioned for enhanced functionality and analysis.

1. IBM Software Group | WebSphere software
Key Tools used for debugging Dynacache Issues
 Published
 Cache Monitor
 Extended Cache Monitor
 Cache Statistics Collector
 Dynacache Mbean
 PMI Counters
 Unpublished (Will be available on cattail soon)
 Cache Portlet Viewer
 Dynacache Probe to inspect the outcome of the caching action
 Script to parse out trace logs to determine the cacheability of a fragment
 Generic PD tools (available on the web)
 Eclipse Memory Analyzer Tool
 Heapdump Analyzer
 Thread and Monitor Dump Analyzer for Java
 PMAT & EVTK tools for verbose GC log analysis

2. IBM Software Group | WebSphere software
CacheMonitor Application
 Shipped with WAS install in the installableApps dir.
 Real-time view of the current state of dynamic cache (works with eXtreme Scale)
 Verify the configuration of dynamic cache
 Verify the cache policies
 Monitor cache statistics
 Monitor the data flowing through the cache (Only works for servlet caches)
 Monitor the data in the edge cache
 View the data offloaded to the disk
 Manage the data in the cache

3. IBM Software Group | WebSphere software
Extended Cache Monitor shipped on DeveloperWorks
 http://www.ibm.com/developerwork
s/websphere/downloads/cache_mo
nitor.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 DC customers that use the
DistributedMap API leverage the
ECM in development and
production.

4. IBM Software Group | WebSphere software
Cache Statistics Collector and Visualizer
 http://www.alphaworks.ibm.com/tech/c
acheviz services/cache/pagecache - DCS Cache Hits
gb02qap070arcx7 - WC_arcwcs1_070.02 - 30/06/2009
 DynaCache JMX Mbean that exposes
10000 100
a # of cache statistics.
90
 Statistics provide insight into the state,
80
health, performance, composition & 1000
70
efficiency of the cache.
Cache Hit Ratio (%)
60
 Statistics enable an app. developer to Rate (1/min)
100 50
tweak caching strategies for optimal 40
operation. 30
 Collect cache statistics using 10
20
DynaCacheStatisticsCSV.py wsadmin
jython script. 10
 outputs statistics in a CSV- 1 0
separated format 12:00 14:00 16:00 18:00 20:00 22:00 0:00
Time
 Statistics can then be charted
with Microsoft Excel or
OpenOffice SpreadSheet.

5. IBM Software Group | WebSphere software
Dynacache Runtime Mbean
 Dynacache Runtime mbean operations:  Access cache statistics with the MBean
 getCacheSize interface Sample JACL …
 getUsedCacheSize  $AdminControl queryNames type=DynaCache,*
 getDiskOverflow
 set mbean <dynamic_cache_mbean>
 getCacheStatisticNames
 $Admincontrol invoke $mbean getCacheStatisticsNames
 getCacheInstanceNames
 AdminControl invoke $mbean getCacheInstanceNames
 getAllCacheStatistics
 getCacheStatistics  $AdminControl invoke $mbean getAllCacheStatistics
 getCacheIDsInMemory  $AdminControl invoke $mbean getAllCacheStatistics
"services/cache/servletInstance_4"
 getCacheIDsOnDisk
 getCacheIDsInPushPullTable  $AdminControl invoke $mbean getCacheStatistics
{"DiskCacheSizeInMB ObjectsReadFromDisk4000K
 getCacheEntry RemoteObjectMisses"}
 invalidateCacheIDs
 $AdminControl invoke $mbean getCacheStatistics
 clearCache {services/cache/servletInstance_4
 getCacheDigest "ExplicitInvalidationsLocal CacheHits"}
 compareCaches
 getStats
 DynaCache Runtime mbean attributes:
 cacheSize
 usedCacheSize
 diskOverflow
 stats

6. IBM Software Group | WebSphere software
PMI Counters