On Sat, 11 Oct 2025 at 20:43, Franco Martelli <[email protected]> wrote: > On 10/10/25 at 20:57, Greg Wooledge wrote:
> > That wouldn't help at all. The rebuild process is bottlenecked by I/O > > speed, not by your CPU. > During the last resync the system loaded the desktop (KDE), I've a CPU > meter in the panel, the CPU usage reported was 10-12.5% for an eight > core CPU so I thought that a single core was used at almost 100% maybe > it's a coincidence, I don't know if mdadm (or the kernel) uses all the > cores of the CPU for the resync process but to me seems no. > > Maybe the next time, I should use a more reliable tool to measure the > CPU usage (top). If I'm right I should toggle "top" to Irix mode in > order to have a CPU's core usage of a single task, see "man top" and > search for the string: "3a. DESCRIPTIONS of Fields" > Sorry if I insist but although it's not my case, today with SSD and NVMe > devices I think that CPU's cores usage matters for a software RAID. Hi, there is a Debian package for 'htop', which is an enhanced 'top'. It runs in console or pseudoterminal, and by default shows a bar graph and % usage of each CPU,see screenshot here: https://htop.dev/screenshots.html
