GotoBLAS2 was released by the Texas Advanced Computing Center as open source software under the BSD license. This product is no longer under active development by TACC, but it is available to the community to use, study, and extend. GotoBLAS2 uses new algorithms and memory techniques for optimal performance of the BLAS routines. The changes in this version target new architecture features in microprocessors and interprocessor communication techniques. In addition, NUMA controls enhance multi-threaded execution of BLAS routines on node.