This Book Constitutes The Refereed Post-conference Proceedings Of 10 Workshops Held At The 35th International Isc High Performance 2020 Conference, In Frankfurt, Germany, In June 2020: First Workshop On Compiler-assisted Correctness Checking And Performance Optimization For Hpc (c3po); First International Workshop On The Application Of Machine Learning Techniques To Computational Fluid Dynamics Simulations And Analysis (cfdml); Hpc Io In The Data Center Workshop (hpc-iodc); First Workshop Machine Learning On Hpc Systems (mlhpcs); First International Workshop On Monitoring And Data Analytics (moda); 15th Workshop On Virtualization In High-performance Cloud Computing (vhpc). The 25 Full Papers Included In This Volume Were Carefully Reviewed And Selected. They Cover All Aspects Of Research, Development, And Application Of Large-scale, High Performance Experimental And Commercial Systems.