From: Robert Joseph Sheehan <r.sheehan@...>
Date: 2006-07-06T08:59:02+09:00
Subject: bug in Process.times?

After repeatedly getting user+system times that are longer than real
time by a constant factor (on a single, non hyper-threading processor),
I thought I would inspect the code for Process.times at ruby-doc.org.

It shows:
#ifndef HZ
# ifdef CLK_TCK
#   define HZ CLK_TCK
# else
#   define HZ 60
# endif
#endif /* HZ */

Unfortunately on several versions of Linux I have tried, including the
latest Fedora and Ubuntu, this seems to give a HZ value of 60 rather
than the correct 100, from "getconf CLK_TCK". (I haven't looked any
further into the Ruby source to examine other places the constants may
be set.)

If I correct for this, my benchmark times now make complete sense with
real time closely approximating user+system times on a lightly loaded
system.

Is this a bug or have I overlooked something?