Dynamic information of Kernel using multithreading Post: 302239712

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Top Forums Programming Dynamic information of Kernel using multithreading Post 302239712 by parkview on Wednesday 24th of September 2008 09:40:31 AM

09-24-2008

Registered User

Dynamic information of Kernel using multithreading

Hi , I am new to this forum. Can someone help me on this question, I have no clue how to proceed . Its urgent..
A continuous program should print out the following dynamic information
(average of an interval). Internally, there should be two parameters with
your program, one is the probing interval and the other one is the printing
(display) interval. e.g., the probing interval could be 1 second, and the
printing interval could be 30 seconds, thus your program can calculate the
required metrics in the last 30 collected samples.(In other words-In the dynamic information part, one thread uses the probing interval to read /proc file, the second thread displays the results with a display interval.) The Program should be written in C
� The percentage of time the processor(s) spending in user mode, system
mode, and idle.
� The percentage of available memory.
� The rate of process creations in the system.
� The rate of context switches in the kernel.
� The rate of disk read/write in the system.

Thanks,

parkview

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LEARN ABOUT BSD

iostat

IOSTAT(1)						      General Commands Manual							 IOSTAT(1)

NAME

       iostat - report I/O statistics

SYNOPSIS

       iostat [ drives ] [ interval [ count ] ]

DESCRIPTION

       Iostat  iteratively  reports the number of characters read and written to terminals per second, and, for each disk, the number of transfers
       per second, kilobytes transferred per second, and the milliseconds per average seek.  It also gives the percentage of time the  system  has
       spent in user mode, in user mode running low priority (niced) processes, in system mode, and idling.

       To  compute this information, for each disk, seeks and data transfer completions and number of words transferred are counted; for terminals
       collectively, the number of input and output characters are counted.  Also, each sixtieth of a second, the state of each disk  is  examined
       and  a  tally  is  made	if the disk is active.	From these numbers and given the transfer rates of the devices it is possible to determine
       average seek times for each device.

       The optional interval argument causes iostat to report once each interval seconds.  The first report is for  all time since  a  reboot  and
       each subsequent report is for the last interval only.

       The optional count argument restricts the number of reports.

       If  more  than  4  disk	drives	are configured in the system, iostat displays only the first 4 drives, with priority given to Massbus disk
       drives (i.e. if both Unibus and Massbus drives are present and the total number of drives exceeds 4, then some number of Unibus drives will
       not  be	displayed in favor of the Massbus drives).  To force iostat to display specific drives, their names may be supplied on the command
       line.

FILES

       /dev/kmem
       /vmunix

SEE ALSO

       vmstat(1)

4th Berkeley Distribution					  April 29, 1985							 IOSTAT(1)