Appendix C: Linux Commands

This appendix contains linux commands used in this book.

List CPU

List CPU information. In this instance, we listed the CPU information for one of our workstations running an AMD Ryzen 9 CPU.

lscpu

Architecture:             x86_64
  CPU op-mode(s):         32-bit, 64-bit
  Address sizes:          48 bits physical, 48 bits virtual
  Byte Order:             Little Endian
CPU(s):                   32
  On-line CPU(s) list:    0-31
Vendor ID:                AuthenticAMD
  Model name:             AMD Ryzen 9 7950X 16-Core Processor
    CPU family:           25
    Model:                97
    Thread(s) per core:   2
    Core(s) per socket:   16
    Socket(s):            1
    Stepping:             2
    CPU(s) scaling MHz:   25%
    CPU max MHz:          5881.0000
    CPU min MHz:          545.0000

Run on select CPU Cores

Run a Java program constrained to a select set of hardware threads. In this instance, we run RunNorthwindDb using cores 0, 1, and 2.

taskset -c 0-2 java -XX:+UseZGC -p ~/workspace/torq_jv_runtime -m org.torqlang.examples/org.torqlang.examples.RunNorthwindDb

Display runtime stats

Show cache misses:

perf stat -e cache-misses COMMAND

Show cache misses while running RunNorthwindDb using 3 cores:

perf stat -e cache-misses taskset -c 0-2 java -XX:+UseZGC -p ~/workspace/torq_jv_runtime -m org.torqlang.examples/org.torqlang.examples.RunNorthwindDb