> >> Average msecs per MB 4.914158; Average copy rate: 0.000005 msecs/byte
> >>
> >> if run without root permission (i.e. mlockall() fails), and
> >>
> >> Average msecs per MB 7.417227; Average copy rate: 0.000007 msecs/byte
> >>
> >> if run with root permission.
> >>
> >> Is there a simple explanation ?
> >
> >mlockall() is a privileged call. Performance could improve if all pages
> >are locked. The non-root version doesn't perform as well because
> >mlockall() fails, subjecting the pages to the system's evil memory
> >management schemes (paging/etc).
> >
> >I'm almost positive you know this though, so your question seems strange.
>
> Look at what I wrote again. It runs *slower* when run as root, and
> faster when not. That is, mlockall() causes it run slower.
I grok "Average msecs per MB 7.417227; Average copy rate: 0.000007
msecs/bytes if run with root permission." as meaning "If I run with root
permissions, I get 7.4xx MB/sec"
-MB
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This archive was generated by hypermail 2b29 : Fri Apr 07 2000 - 21:00:10 EST