Hi Seth, Pardon my ignorance. I looked up Heisenburg's uncertainty principal and I wonder if there is any academic proof or theory on its parallel in the kernel area. I mean to say is there any works that said that one particular way of measuring the kernel is not much better than another? :-PPPP > -----Original Message----- > From: kernelnewbies-bounce@nl.linux.org > [mailto:kernelnewbies-bounce@nl.linux.org] On Behalf Of Seth Arnold > Sent: Wednesday, July 10, 2002 2:40 PM > To: kernelnewbies@nl.linux.org > Subject: Re: effects of measurement > > > On Wed, Jul 10, 2002 at 02:24:26PM +0900, Jonathan Khoo wrote: > > However, I also realize that by adding unnecessary printk > statements > > will affect the system performance. How can I measure the "actual" > > timings? > > Heisenburg's uncertainty principal plays a part in kernel > development :) You will always be stuck with "bad" timings > from measuring the timings. There is no way around that. > However, by just storing the timings in a memory buffer to be > retrieved later (say, through a character device, ioctl, > /proc file, sysctl, or your own filesystem) _AFTER_ you are > done doing whatever it is you care about, ought to help your > timing immensely. > > printk is just so blasted slow. > > -- > http://sardonix.org/ > -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
