g2log as described on http://www.kjellkod.cc//g2log-efficient-background-io-processign-with-c11
An asynchronous logging utility. Disk /IO access is done in a background thread. It's inspired in part from Google's glog but is much smaller feature-wise but also much faster. Performance comparison with glog gives something like 10-25% faster on the average and up to 50 times faster in a worst case scenario.
Enjoy KjellKod
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