code: protected void mergeConfiguration(GraphAlgorithmWrappingBase other) {
  		Preconditions.checkNotNull(other);
  
  		parallelism = (parallelism == PARALLELISM_DEFAULT) ? other.parallelism :
  			((other.parallelism == PARALLELISM_DEFAULT) ? parallelism : Math.min(parallelism, other.parallelism));
  	}
docs: Merge the other configuration into this algorithm's after the call to
  {@link #canMergeConfigurationWith} has checked that the configurations
  can be merged.
  
  @param other the algorithm from which to merge configuration
  
  @see #canMergeConfigurationWith(GraphAlgorithmWrappingBase)