File and Data Systems

Create

• 10000 files of 1 MB each
• 100 files of 100 MB each
• 1 file of 10 000 MB

in your /scratch/ directory on levante.

• Read them once and measure the durations for the read operations
• Read every file 10x and measure the durations for the read operations
• Repeat the read part of the exercise after a few hours.

Discuss your results.

Create a directory /dev/shm/$USER (replace $USER with your user ID) and repeat the exercise in there - you will probably need about 100 GB RAM to do this (or simply compute node) - no delayed repeat needed here (why?).