With a gcov enabled kernel, gathering coverage stats is a trivial process with lcov:
sudo apt-get install lcov sudo lcov --zerocounters stress-ng --seq 0 -t 60 sudo lcov -c -o kernel.info sudo genhtml -o html kernel.info
..and the html output appears in the html directory.
In the latest 0.06.00 release of stress-ng, the following new features have been introduced:
- af-alg stressor, added skciphers and rngs
- new Translation Lookaside Buffer (TLB) shootdown stressor
- new /dev/full stressor
- hdd stressor now works through all the different hdd options if --maximize is used
- wider procfs stressing
- added more keyctl commands to the key stressor
- new msync stressor, exercise msync of mmap'd memory back to file and from file back to memory.
- Real Time Clock (RTC) stressor (via /dev/rtc and /proc/driver/rtc)
- taskset option, allowing one to run stressors on specific CPUs (affinity setting)
- inotify stressor now also exercises the FIONREAD ioctl()
- and some bug fixes found when testing stress-ng on various architectures.
stress-ng --taskset 1,3,5-7 --cpu 5
..thanks to Jim Rowan (Intel) for the CPU affinity ideas.
stress-ng 0.06.00 will be landing in Ubunty Yakkety soon, and also in my power utilities PPA ppa:colin-king/white