changed matMulMPICUDA to make computation on master node
changed matMulMPICUDA to make computation on master node

raffmont/GVirtuS,RapidProjectH2020/GVirtuS,raffmont/GVirtuS,raffmont/GVirtuS,RapidProjectH2020/GVirtuS,RapidProjectH2020/GVirtuS,RapidProjectH2020/GVirtuS,raffmont/GVirtuS