Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10 5/3/83; site houxf.UUCP Path: utzoo!linus!wivax!decvax!harpo!eagle!mhuxt!mhuxi!mhuxa!houxm!houxf!govern From: govern@houxf.UUCP Newsgroups: net.unix-wizards Subject: Why is the "real time" so much greater than the "cpu time" Message-ID: <374@houxf.UUCP> Date: Thu, 14-Jul-83 15:59:23 EDT Article-I.D.: houxf.374 Posted: Thu Jul 14 15:59:23 1983 Date-Received: Fri, 15-Jul-83 01:50:20 EDT Organization: Bell Labs, Holmdel NJ Lines: 19 On my 4.1BSD system, the output of "time" for a long, CPU-intensive program typically shows a "real time" about 20 times as high as the CPU time, and the "user" time is often close to the real time. 1) Is this normal? The ratio seems awfully high. How can I check to see if the system is running ok or if it needs tuning? 2) Exactly what times go into the CPU and user times? - When a process has 20% of the CPU, is the "CPU time" value scaled to reflect this? - Where does IO time fit in? - What about paging time? (The application was a very large simulation, so it has to page a lot.) Thanks; Bill Stewart houxf!govern ucbvax!ihnp4!houxf!govern allegra!houxf!govern