CERN Linux 10 System in non-virtual machines Local 1O Since we measure here, Measurement Tools User read.write 244 GLIBC strace System-call Interface SCI ere房he meta data Cache implemented Virtual Filesystem Switch VFS (not important for the 已X日1Cs XFS EXT4 FS(x) Here is the data cache Skip imalementod important for the Block Layer CxICSES using vmstat iostat Device Drivers KERNEL CERN） CSC 2018 Data Technology ExercisesCSC 2018 Data Technology Exercises Linux IO System Skip caching using direct IO Measurement Tools in non-virtual machines Local IO