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Status Delivered
Workspace IMS System Services
Categories System Management
Created by Guest
Created on Jan 24, 2013

RELATED IDEAS

Change cache algorithm to manage XML-converters in ICON

The ICON parameter MAXCVRT to set cache size of XML-converters is fine.

What is not optimal is the algorithm used to unload/load XML-converters if the cache is full.

current algorithm: Due to some discussions with IBM employees the less used converter will be unloaded. If two converter have exactly the same usage count the least recently used will be unloaded. Every time a converter will be loaded its usage counter starts with zero.

Because every time the counter starts with zero the risk is very high that a just loaded converter will unloaded again after first usage.

A more efficient algorithm would be the simple LRU (least recently used, http://en.wikipedia.org/wiki/Cache_algorithms#Least_Recently_Used)

To demonstrate these effects I wrote a simulation program that simulates the cache behavior in dependence of cache size in our (credit-suisse) future expected production environment: We plan to migrate our widely used CORBA infrastructure through web services. To simulate the cache I just took all CORBA requests (i.e. timestamp, operation name) from one day an executed the simulation program (see attachement)

Idea priority High
  • Guest
    Reply
    |     Jun 6, 2014

    This requirement has also been implemented in IMS Version 12, with apar PI16271, PTF UI18463.

  • Guest
    Reply
    |     Jun 6, 2014

    This requirement has been implemented in IMS Version 13, with apar PI16273, PTF UI18464.
    The algorithm for determining which converter to unload has been changed, so that only the least recently used will be considered.

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