Musing on the Future of Computing

The Symas Blog Keeping our clients up to date on big fixes, helpful tips, and more. Symas has set the pace in the database world with LMDB. The efficiency gains from LMDB’s Single Level Store approach make LMDB’s performance unmatched by any other...

Understanding LMDB Database File Sizes and Memory Utilization

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:

Carrier-Grade Stability and Performance

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.