topic Re: memory for a particular process in Operating System - HP-UX

memory for a particular process

antonio elder prado — Thu, 10 Feb 2005 10:12:30 GMT

Hi,
do you know if it is possible to dedicate , say 80% of memory to a particular process.
do you think nice would do the trick ?
basically I have a machine with 7G of memory and some developers need to get at least 5G to a particular process.
TIA
./antonio/.

Re: memory for a particular process

RAC_1 — Thu, 10 Feb 2005 10:18:33 GMT

You need to educate your developers. Why they so much memory?? What part of program will take that much memory?? text, data, stack??

Technically you can do that, provided you satisfy certain conditions. - program needs to be 64 bit program. you need to have PRM product-lisenced product. But I think you wont need that much. If system has enough memory, your program can run withour any performance problem. You also need to take into consideration what else you are running on the system.

Anil

Re: memory for a particular process

Pete Randall — Thu, 10 Feb 2005 10:18:38 GMT

HP makes a separate, purchaseable product called Process Resource Manager (PRM) to do just this sort of tuning.

Pete

Re: memory for a particular process

Peter Godron — Thu, 10 Feb 2005 10:20:31 GMT

Antonio,
nice and renice would change the priority of the program on the CPU, but if another process already has memory, would not necessarily release the memory.

Can you increase the swap area, wait for a less busy time to run or sit in the background grabbing memory (malloc) as it becomes free?

Regards

Re: memory for a particular process

Geoff Wild — Thu, 10 Feb 2005 10:22:46 GMT

PRM:

http://www.software.hp.com/portal/swdepot/displayProductInfo.do?productNumber=B3835DA

Rgds...Geoff

Re: memory for a particular process

A. Clay Stephenson — Thu, 10 Feb 2005 10:24:46 GMT

Nice will not do this. You can purchase the PRM (Process Resource Manager) package to do this. I assume that you have already increased maxdsiz_64bit, maxssiz_64bit, and maxtsiz_64bit as well as shmax up to the required values. You should be aware that these limits apply to virtual memory and not physical memory. Normally, code requiring this much memory should be dynamically allocated and should adapt itself to whatever limits it encounters or at least issue an error message and exit. If your developers are not using dynamic memory allocation for data structures this large then replace your developers.

Re: memory for a particular process

antonio elder prado — Thu, 10 Feb 2005 10:30:52 GMT

thank you all, seems that PRM is the way to go to resolve this immediate problem.

./antonio/.