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'''Basic Linear Algebra Subprograms''' ('''BLAS''') are [[routine]]s which perform basic [[linear algebra]] operations such as [[vector space|vector]] and [[matrix (mathematics)|matrix]] [[multiplication]]. They are used to build larger packages such as [[LAPACK]]. BLAS routines are tuned by [[high performance computing]], [[supercomputer]] hardware, and software vendors to run extremely fast under a variety of problem sizes. The [[LINPACK]] benchmark relies heavily on [[DGEMM]], a BLAS subroutine, for its performance.
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