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 Unpublished (Will be available on cattail soon)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