APAR status
Closed as program error.
Error description
A replication query is used to find entries in the cache that have changed since the last replication event. That query was O(N) in complexity, it scanned all entries in the partition. This results in longer query times as the number of entries increases which also causes higher CPU utilization.
Local fix
N/A
Problem summary
**************************************************************** * USERS AFFECTED: All users of asynchronous replication. * **************************************************************** * PROBLEM DESCRIPTION: When using * * asynchronous replication, * * proessor utilization * * grows as the * * number of entries increases. * **************************************************************** * RECOMMENDATION: * **************************************************************** The asynchronous replication path includes both intra-domain asynchronous replication and multi-master primary to primary replication. When these paths are used, processor utilization grows as the number of entries increases and there are changes to be replicated. The problem is that the algorithm to calculate the changes to send searches for all entries within a window. The current implementation needs to look at every entry to find all of the changes within the window.
Problem conclusion
A new algorithm that searches for entries in constant time rather than linear time was implemented to improve performance.
Temporary fix
Comments
APAR Information
APAR number
PM39514
Reported component name
XD EXTREME SCAL
Reported component ID
5724J3402
Reported release
710
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt
Submitted date
2011-05-18
Closed date
2011-07-27
Last modified date
2011-07-27
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
XD EXTREME SCAL
Fixed component ID
5724J3402
Applicable component levels
R700 PSY
UP
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Document Information
Modified date:
23 September 2020