getrusage gives stats for the entire process, very handy, but won't work if you just want to time a specific function or chunk of code. On Thursday 11 July 2002 1:42 pm, Karthik M wrote: > 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/
