src/test/config/SystemDS-config.xml

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<root>
   <!-- local fs tmp working directory-->
   <sysds.localtmpdir>/tmp/systemds</sysds.localtmpdir>

   <!-- hdfs tmp working directory--> 
   <sysds.scratch>scratch_space</sysds.scratch>

   <!-- compiler optimization level, valid values: 0 | 1 | 2 | 3 | 4, default: 2 -->
   <sysds.optlevel>2</sysds.optlevel>

   <!-- default block dim for binary block files -->
   <sysds.defaultblocksize>1000</sysds.defaultblocksize>

   <!-- enables multi-threaded matrix operations in singlenode control program -->
   <sysds.cp.parallel.ops>true</sysds.cp.parallel.ops>
   
   <!-- enables multi-threaded read/write in singlenode control program -->
   <sysds.cp.parallel.io>true</sysds.cp.parallel.io>

   <!-- enables native blas for matrix multiplication and convolution, experimental feature (options: auto, mkl, openblas, none) -->
   <sysds.native.blas>none</sysds.native.blas>

   <!-- custom directory where BLAS libraries are available, experimental feature (options: absolute directory path or none). If set to none, we use standard LD_LIBRARY_PATH. -->
   <sysds.native.blas.directory>none</sysds.native.blas.directory>

   <!-- The number of theads for the spark instance artificially selected-->
   <sysds.local.spark.number.threads>16</sysds.local.spark.number.threads>
</root>