If I understand, that result is the ratio of the change in the thread's process time to the change in real time. For example, if a thread's process time grows by 500 milliseconds over one second, then that's 50% CPU usage.
At Sat, 17 Nov 2012 20:07:22 +0900, 주대연 wrote: > Thanks for Matthew. > > I have one more question. > I want to obtain cpu usage rate you can see it in TaskManager in windows. > > TaskManager shows us a cpu usage per thread. > I looked the reference manuals in Web Site but I didn't find it. > > So How can I obtain that rate value per thread? > > Thanks for your reply. > Have a nice day. > > Sent from my iPad > > On 2012. 11. 16., at 오후 10:28, Matthew Flatt <mfl...@cs.utah.edu> wrote: > > > At Fri, 16 Nov 2012 15:33:39 +0900, 주대연 wrote: > >> Hi I am a student in master course for Computer Engineering. > >> > >> I am studying Racket for my research. > >> My one of goals is to measure the performance(cpu usages, memory, i/o..etc) > >> of each thread. > >> > >> So I have two questions... > >> > >> 1) CPU, I/O usages > >> > >> Is there any way to measure CPU usage per each thread in run-time by > >> Racket? > > > > The `current-process-milliseconds' function returns a thread-specific > > value if you give it a thread argument. > > > >> 2) Memory usages > >> > >> Also memory usages per each thread in rum-time?? > >> As I know Linux doesn't provide the way to measure memory usage per each > >> thread. > >> So How about Racket? > > > > You can't ask for thread-specific memory use directly, but you can ask > > for custodian-specific memory use, and every thread can have its own > > custodian. > > > > Beware of sharing among threads and how that influences memory > > accounting. For more information about custodian-based memory > > accounting, see > > > > "Memory Accounting without Partitions" > > Wick and Flatt, ISMM'04 > > http://dl.acm.org/authorize?730730 > > Addendum: > > http://www.cs.utah.edu/plt/publications/ismm04-addendum.txt > > ____________________ Racket Users list: http://lists.racket-lang.org/users
