Ingres 9.2 Migration Guide - Actian

Logging System Performance ImprovementsLogging System Performance ImprovementsA number of improvements to the logging system eliminate or at leastminimize bottlenecks identified when running various performance tests. Thesechanges include elimination of contentious current_llb_mutex, faster log forcesthrough forcing only what needs forcing, and improved concurrency potential(fast resume).Buffer Manager Performance ImprovementsA number of improvements have been made to the buffer manager toeliminate or minimize bottlenecks identified when running various performancetests. These include:• Removal of stats for fixed priority pages. In Ingres 2.6, stats are trackedby buffer page type for better analysis of the BM’s LRU algorithm.• Raising a buffer’s priority each time it is fixed; previously it was raised onlywhen newly fixed.Operating System IntegrationEnhancements have been made to the internal performance that concern 64­bit operating systems and operating system thread implementation on Linux.64-Bit Operating SystemsNow that Microsoft, Sun, HP, and Linux vendors have produced 64-bit versionsof their operating systems, we are providing a 64-bit build of Ingres on theseplatforms. Every effort is made to exploit large memory and files in these 64­bit environments.Operating System Thread Implementation on LinuxIngres 2.6 provides support for operating system threads in Linuxenvironments including Intel, Alpha, S/390, and IA64. Operating systemthreads perform better in most circumstances than the internal Ingresthreading model.200 Migration Guide