On the two DragonFly systems, was it Hammer or UFS? I would be surprised if that made a difference, but it might?
On Sat, Dec 10, 2016 at 6:19 AM, PeerCorps Trust Fund <[email protected]> wrote: > Hi, > > I've observed that parallel compression tools such as pixz and lbzip2 do not > make use of all of the available CPU under Dragonfly. On other OSes, it > does. > > When testing on a 50 gb file, using top I've observed that CPU idle > percentages consistently hover around the 90% range for pixz and ~70% for > lbzip2. These values under FreeBSD and Linux are typically ~0.0% idle until > compression is complete. Correspondingly, compression takes significantly > longer under Dragonfly, so the CPU is really being under utilized in this > case as opposed to erroneous reporting by top. > > This was tested on two systems, one 16c/32t and a 2c/2t system on a recent > master DragonFly v4.7.0.973.g8d7da-DEVELOPMENT #2: Wed Dec 7 11:44:04 EET > 2016. > > Has anyone else possibly observed this? > > -- > Mike >
