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CPU utilization for a multiple cpu computer and calculating
OpenQNX Forum Index » General » QNX Newsgroups » qnx.rtos
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sabtain
Post subject: CPU utilization for a multiple cpu computer and calculating   PostPosted: Nov 06, 2007 - 07:05 PM
Guest
Hello,
I am writing a c++ program for calculating CPU utilization of a
computer that has multiple CPUs. If anyone knows of a API or library
call,please inform me.

Also, what is the quickest way to find the amount of free space on a mount
point for a c++ program.

Thanks,

Sabtain
 
   
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Colin Burgess
Post subject: Re: CPU utilization for a multiple cpu computer and calculat  PostPosted: Nov 06, 2007 - 10:56 PM
Guest
Hi Sabtain,

Use ClockTime() to generate a clock id for the first <ncpu> threads of procnto (pid 1).
They are the idle threads for each processor.

You can then poll them at regular intervals to gauge how long they have been running.
The processor usage can be determined by the ratio of interval to nsecs executed.

Regards,

Colin

sabtain wrote:
Quote:
Hello,
I am writing a c++ program for calculating CPU utilization of a
computer that has multiple CPUs. If anyone knows of a API or library
call,please inform me.

Also, what is the quickest way to find the amount of free space on a mount
point for a c++ program.

Thanks,

Sabtain



--
cburgess@qnx.com
 
   
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sabtain
Post subject: Re: CPU utilization for a multiple cpu computer and calculat  PostPosted: Nov 07, 2007 - 02:28 PM
Guest
Thanks for replying but I have a further quesiton. Even on a single
processor PC, the procnto has 11 threads running. what does that mean?


"Colin Burgess" <cburgess@qnx.com> wrote in message
news:fgqr9o$o8e$1@inn.qnx.com...
Quote:
Hi Sabtain,

Use ClockTime() to generate a clock id for the first <ncpu> threads of
procnto (pid 1).
They are the idle threads for each processor.

You can then poll them at regular intervals to gauge how long they have
been running.
The processor usage can be determined by the ratio of interval to nsecs
executed.

Regards,

Colin

sabtain wrote:
Hello,
I am writing a c++ program for calculating CPU utilization of a
computer that has multiple CPUs. If anyone knows of a API or library
call,please inform me.

Also, what is the quickest way to find the amount of free space on a
mount point for a c++ program.

Thanks,

Sabtain

--
cburgess@qnx.com
 
   
Reply with quote Back to top
Colin Burgess
Post subject: Re: CPU utilization for a multiple cpu computer and calculat  PostPosted: Nov 07, 2007 - 03:13 PM
Guest
procnto starts a threadpool to handle it's resource managers. In a normal scenario they are pretty much all idle,
awaiting messages.

sabtain wrote:
Quote:
Thanks for replying but I have a further quesiton. Even on a single
processor PC, the procnto has 11 threads running. what does that mean?


"Colin Burgess" <cburgess@qnx.com> wrote in message
news:fgqr9o$o8e$1@inn.qnx.com...
Hi Sabtain,

Use ClockTime() to generate a clock id for the first <ncpu> threads of
procnto (pid 1).
They are the idle threads for each processor.

You can then poll them at regular intervals to gauge how long they have
been running.
The processor usage can be determined by the ratio of interval to nsecs
executed.

Regards,

Colin

sabtain wrote:
Hello,
I am writing a c++ program for calculating CPU utilization of a
computer that has multiple CPUs. If anyone knows of a API or library
call,please inform me.

Also, what is the quickest way to find the amount of free space on a
mount point for a c++ program.

Thanks,

Sabtain
--
cburgess@qnx.com



--
cburgess@qnx.com
 
   
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John Garvey
Post subject: Re: CPU utilization for a multiple cpu computer and calculat  PostPosted: Nov 07, 2007 - 03:29 PM
Guest
sabtain wrote:
Quote:
Also, what is the quickest way to find the amount of free space on a mount
point for a c++ program.

Look at the statvfs() function ...
 
   
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