APAR status
Closed as program error.
Error description
As the number of objects in a graph of objects increases, the amount of time to do a get/commit increases when doing serialization and deserialization of objects also increases. For these type of objects, as you add more threads it gets worse because of bottlenecks that are preventing threads from getting CPU cycles.
Local fix
Problem summary
**************************************************************** * USERS AFFECTED: Users of eXtreme Scale who use the eXtreme * * Data Format (XDF) function and have very * * large graphs of objects that they store in * * the grid. Additionally some or all of the * * objects in the large graph need to make * * use of readObject and/or writeObject or * * be externalizable. * **************************************************************** * PROBLEM DESCRIPTION: As the number of threads using the * * grid increases, response time * * decreases with large graphs of * * objects. * **************************************************************** * RECOMMENDATION: * **************************************************************** Two bottlenecks in the XDF code were identified: -For the first bottleneck, where the code was accessing a shard or JVM scoped object that required synchronization, it was changed to cache the result for the length of the serialization/deserialization instead of accessing the resource on each object in the graph. -For the second bottleneck, a method that was synchronized was changed to no longer require synchronization.
Problem conclusion
An interim fix is available for this APAR.
Temporary fix
Comments
APAR Information
APAR number
PI14184
Reported component name
WS EXTREME SCAL
Reported component ID
5724X6702
Reported release
860
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt
Submitted date
2014-03-21
Closed date
2014-04-15
Last modified date
2014-04-15
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
Fix information
Fixed component name
WS EXTREME SCAL
Fixed component ID
5724X6702
Applicable component levels
R860 PSY
UP
[{"Business Unit":{"code":"BU053","label":"Cloud & Data Platform"},"Product":{"code":"SSTVLU","label":"WebSphere eXtreme Scale"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"860","Edition":"","Line of Business":{"code":"LOB45","label":"Automation"}}]
Document Information
Modified date:
15 April 2014