hi, u may probably want to check out getrusage() command. This calculates the time taken for the execution of commands just like the command time. time is a shell command i suppose but the getrusage() is a funtion in the kernel. I have tried it in the past but i had some problems with the accuracy of the results that it produces. Maybe i am doing something wrong. Has anyone else tried something with getrusage() ?? TIA karthik --- Tom Bradley <tbradley@jaycor.com> wrote: > If you are timing things inside the kernel 'time' > won't give you what you > want, this is for timing user-land processes. I > would use the do_gettimeofday > function and store the values in a variable and use > a /proc entry to read > them. This will have the least interference with the > timings. This will also > let you do some stats on it, say longest time, > shortest time and average > time. > > Tom > > > > On Thursday 11 July 2002 11:26 am, Christine Ames > wrote: > > --- Jonathan Khoo <jonath-k@is.aist-nara.ac.jp> > wrote: > > > Hi guys, > > > > > > I want to measure the timings between various > operations in the > > > kernel > > > and the only way I know of is to use printk to > output the timings. > > > However, I also realize that by adding > unnecessary printk > > > statements > > > will affect the system performance. How can I > measure the "actual" > > > timings? > > > > Those more experienced will (please!) correct me > if I am wrong: > > > > ]time your-command // will time start/end of a > command > > > > E.g. to "time" the command ls -l: > > > > [root@eng-03 wordbook] time ll > > total 692 > > -rwxr-xr-x 1 root root 516 Feb 28 > 06:00 > > dictionary.lst* > > -rwxr-xr-x 1 root root 1809 Feb 28 > 06:00 en_US.aff* > > -rwxr-xr-x 1 root root 695724 Feb 28 > 06:00 en_US.dic* > > > > real 0m0.245s > > user 0m0.010s > > sys 0m0.010s > > > > Harmony, > > > > --Christine > > > > > > __________________________________________________ > > Do You Yahoo!? > > Sign up for SBC Yahoo! Dial - First Month Free > > http://sbc.yahoo.com > > -- > Kernelnewbies: Help each other learn about the Linux > kernel. > Archive: > http://mail.nl.linux.org/kernelnewbies/ > FAQ: http://kernelnewbies.org/faq/ > __________________________________________________ Do You Yahoo!? Sign up for SBC Yahoo! Dial - First Month Free http://sbc.yahoo.com -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
