_/proc/stat vs /proc/uptime

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Old 05-08-2009
_/proc/stat vs /proc/uptime


I am trying to calculate the CPU Usage by getting the difference between the idle time reported by /proc/stat at 2 different intervals. Now the 4th entry in the first line of /proc/stat will give me the 'idle time'. But I also came across /proc/uptime that gives me 2 entries : 1st one as the time in seconds since the system has been 'up' and the other entry being the number of seconds the system has been idle.

Dummy question : Should the 4th entry the /proc/stat and the 2nd entry /proc/uptime match each other ? If not, why ?

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MPSTAT(1)							Linux User's Manual							 MPSTAT(1)

mpstat - Report processors related statistics. SYNOPSIS
mpstat [ -P { cpu | ALL } ] [ -V ] [ interval [ count ] ] DESCRIPTION
The mpstat command writes to standard output activities for each available processor, processor 0 being the first one. Global average activities among all processors are also reported. The mpstat command can be used both on SMP and UP machines, but in the latter, only global average activities will be printed. The interval parameter specifies the amount of time in seconds between each report. A value of 0 indicates that processors statistics are to be reported for the time since system startup (boot). The count parameter can be specified in conjunction with the interval parameter if this one is not set to zero. The value of count determines the number of reports generated at interval seconds apart. If the interval parameter is specified without the count parameter, the mpstat command generates reports continuously. REPORTS
The report generated by the mpstat command has the following format: CPU Processor number. The keyword all indicates that statistics are calculated as averages among all processors. %user Show the percentage of CPU utilization that occurred while executing at the user level (application). %nice Show the percentage of CPU utilization that occurred while executing at the user level with nice priority. %system Show the percentage of CPU utilization that occurred while executing at the system level (kernel). %idle Show the percentage of time that the CPU or CPUs were idle. intr/s Show the total number of interrupts received per second by the CPU or CPUs. OPTIONS
-P cpu | ALL Indicate the processor number for which statistics are to be reported. cpu is the processor number. Note that processor 0 is the first processor. The ALL keyword indicates that statistics are to be reported for all processors. -V Print version number and usage then exit. ENVIRONMENT
The mpstat command takes into account the following environment variable: S_TIME_FORMAT If this variable exists and its value is ISO then the current locale will be ignored when printing the date in the report header. The mpstat command will use the ISO format (YYYY-MM-DD) instead. EXAMPLES
mpstat 2 5 Display five reports of global statistics among all processors at two second intervals. mpstat -P ALL 2 5 Display five reports of statistics for all processors at two second intervals. BUGS
/proc filesystem must be mounted for the mpstat command to work. Only a few activities are supplied by the Linux kernel for each processor. FILES
/proc contains various files with system statistics. AUTHOR
Sebastien Godard <sebastien.godard@wanadoo.fr> SEE ALSO
sar(1), sadc(8), sa1(8), sa2(8), iostat(1), vmstat(8) http://perso.wanadoo.fr/sebastien.godard/ Linux MAY 2000 MPSTAT(1)

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