[Bug 387347] pipe uses only 1 CPU on dual-core ("zcat | wc")

https://bugzilla.novell.com/show_bug.cgi?id=387347 User koenig@linux.de added comment https://bugzilla.novell.com/show_bug.cgi?id=387347#c2 Harald Koenig changed: What |Removed |Added ---------------------------------------------------------------------------- Status|RESOLVED |REOPENED Resolution|INVALID | --- Comment #2 from Harald Koenig 2008-05-07 01:41:20 MST --- (In reply to comment #1 from Greg Kroah-Hartman)

This is only a single process running, how could both cores be used for it?

please read again (or maybe try yourself?)! there are _two_ processes running for this test: gzip and wc, both using almost exactly the same amount of cpu bandwidth. actually, it's pretty hard using a pipe with only a single process, isn't it ;-) top shows _two_ processes, both only getting 50% cpu instead of 100% each, so I'm loosing a factor of 2 in real time (wall clock) performace. "procinfo -dn1" shows 50% idle -- that's the unused 2nd core!

This shows the scheduler is working quite well, and properly :)

NOPE. -- Configure bugmail: https://bugzilla.novell.com/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug.