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Symas is continuously striving to provide our customers with excellent products. This on-going pursuit leads us to offer the latest Production Release of Symas OpenLDAP Gold, 2.4.47-1.
The Lightning Memory-mapped Database (LMDB) is designed around the virtual memory facilities found in modern operating systems, Multi-version Concurrency Control (MVCC), and Single-Level Store (SLS) concepts. This design is quite different than those of more traditional databases and, in operation, it can mimic behaviors that system administrators have been trained to recognize as signs of trouble. With LMDB, though, the behaviors are normal, but nonetheless this leads to the following questions:
Yes, LMDB is fast, blindingly fast. Can we make it faster still? Yes.
Early last year our client Acision ran a torture test on Symas OpenLDAP as part of acceptance testing for their telco offerings. These tests were performed on a directory consisting of one master replicating to two consumers, and included a number of crash/recovery tests as well as performance measurements. The short summary of the results: after two weeks of continuous testing, no problems.