Explained about Virtual Memory and Hows it works with Block diagram
https://www.cs.uic.edu/~jbell/CourseNotes/OperatingSystems/9_VirtualMemory.html
https://www.digitalocean.com/community/tutorials/atop-command-in-linux
Useful option:
atop
- SYSCPU - The amount of CPU consumed by the process while system handling.
- USRCPU - The amount of CPU consumed by the process, during its running in user mode.
- VGROW - The amount of virtual memory that the process has occupied since the last value update.
- RGROW - The amount of resident (physical) memory grown since last value update.
- RDDSK - The size of data transferred during disk reads.
- WRDSK - The size of data transferred during disk writes.
- RUID - The real user ID under which the process is being executed.
- EUID - The effective user ID under which the process is being executed.
- ST - The current status of the process.
- EXC - The exit code after the process terminates
- THR - The number of threads within the process.
- S - The current status of the primary thread of the process.
- CPU - The percentage of CPU utilization of the entire process.
- CMD - The name of the process.
atop -m
- MINFLT - The number of minor page faults that have been solved by accessing data from free pages.
- MAJFLT - The number of major page faults that have been solved by especially retrieving data from disk.
- VSTEXT - The virtual memory occupied by the process text.
- VSLIBS - The virtual memory occupied by the shared libraries of the process.
- VDATA - The virtual memory size of the private data of the process.
- VSTACK - The virtual memory size of the private stack of the process.
- VSIZE - The total virtual memory size of the process.
- RSIZE - The total resident memory occupied by the process.
- MEM - The percentage of RAM consumed by the process.
