Mikael Ronstrom: Memory Management in RonDB

My name is Mikael Ronstrom and I work for Logical Clocks AB as Head of Data. I also assist companies working with NDB Cluster as self-employed consultant. I am a member of The Church of Jesus Christ of Latter Day Saints. I can be contacted at mikael dot ronstrom at gmail dot com for NDB consultancy services. The statements and opinions expressed on this blog are my own and do not necessarily represent those of Logical Clocks AB.

 Most of the memory allocated in RonDB is handled by the global memory manager. Exceptions are architecture objects and some fixed size data structures. In this presentation we will focus on the parts handled by the global memory manager.

One could divide those regions into a set of qualities. We have a set of regions that are fixed in size, another set of regions are critical and cannot handle failure to allocate memory, a set of regions have no natural upper limit and are unlimited in size, there is also a set of regions that are flexible in size that can work together to achieve the best use of memory. We can also divide regions based on whether the memory is short term or long term. Each region can belong to multiple categories.

To handle these qualities of the regions we have priorities on each memory region, this priority can be affected by the amount of memory that the resource has allocated.

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