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тАО02-10-2008 11:41 PM
тАО02-10-2008 11:41 PM
Diffrence b/w 1 processor and 4 processor server
Recently i migrate one application from HP-UNIX L1000 single processor server to HP-UNIX rp3440 4 processor server.
Apllicaction was succsfully migrated. Now i want to take the advantage of 4 processor server. Will i need to change the code to shere the application load on diff processors at run time.
Please give me your suggestions in this regards.
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тАО02-10-2008 11:45 PM
тАО02-10-2008 11:45 PM
Re: Diffrence b/w 1 processor and 4 processor server
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тАО02-10-2008 11:52 PM
тАО02-10-2008 11:52 PM
Re: Diffrence b/w 1 processor and 4 processor server
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тАО02-10-2008 11:58 PM
тАО02-10-2008 11:58 PM
Re: Diffrence b/w 1 processor and 4 processor server
Summing up all of your executables, are you using 100% of all 4 CPUs?
Are you optimizing your applications? What language(s) is it using?
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тАО02-11-2008 12:05 AM
тАО02-11-2008 12:05 AM
Re: Diffrence b/w 1 processor and 4 processor server
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тАО02-11-2008 05:59 AM
тАО02-11-2008 05:59 AM
Re: Diffrence b/w 1 processor and 4 processor server
>> In normal case processors are not bussy more then 40%. This is a real time application so verious exe's have to continouly poollin on database , sockets and queues. I am using C and sybase 15.0.
Then there is no big usage / throughput advantage for more than 1 CPU.
The extra cpus MAY be helping to give better reponse time.
As you already have multipel processes, the HPUX scheduler will already schedule them on the first available CPU unless it is being told otherwise (processor sets, mpsched).
Just verify with the 'top' command.
In the first column you'll see the last cpu used for a given process. Surely this will show all 4, proving SMP is trying to help, not just 0.
And uh... kudos to the salesman!
I hope the right expectations (low) were set.
Cheers,
Hein.
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тАО02-11-2008 08:41 AM
тАО02-11-2008 08:41 AM
Re: Diffrence b/w 1 processor and 4 processor server
Are you sure? If all are at 40%: 4 * 40% == 1.6 CPUs.
>The extra CPUs MAY be helping to give better response time.
They can also do other work, run another application.
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тАО02-11-2008 09:31 AM
тАО02-11-2008 09:31 AM
Re: Diffrence b/w 1 processor and 4 processor server
Dennis> Are you sure? If all are at 40%: 4 * 40% == 1.6 CPUs.
Yes. Of course. If that 40% was for all 4 CPUs then obviously the application already have a benefit from the extra cpu: Any uage above 25% goes without saying, and any usage above 20% also has a good chance of being aided as is likely to indicate concurrent usage.
I just assumed 40% of 1 CPU because of original question itself. If you see more than 1 cpu worthe being used then why as teh question in the first place.
Grins,
Hein.
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тАО02-12-2008 09:37 AM
тАО02-12-2008 09:37 AM
Re: Diffrence b/w 1 processor and 4 processor server
A process not using threads cannot take advantage of the services of more than one CPU. If that process is then showing 100% CPU util in top/glance that means it is using as much CPU as it possibly can, and unless you can split it into multiple processes, or rewrite it to use multiple threads within the one process, that is as far as things are going to go.
If you want to start considering threading, I believe you should still be able to obtain a copy of a book titled "Threadtime" by Norton et al, who were/are the threads experts for pthreads on HP-UX. Otherwise, you might just look at the pthreads related manpages or other sources of pthread documentation.