Process stopped due to low resources

[vijender yadav]

Hi,

During performance testing of our application, at one point (low resources) the application got stopped.
There was no problem with application though.

Does the Hpux Operating system stop some processes as a protective
action if it detects that the system resources become insufficient.

Is there any documentation about same available.
If yes, kindly mail the URL.

Regards
Vijender

[RAC_1]

How did you check the process was stopped??

If system is hitting the resources, it may be stopped and will be run when resources become available again. You can check what resource it is blocking on with
glance -B

Anil

[Sridhar Bhaskarla]

Hi Vijender,

No. HPUX OS doesn't stop any processes as a protective action. However, if the system is low on memory, the least used pages will be paged out and it will take sometime to get them back when the process is ready to run again. Depending on the memory pressure, sometimes, it may take quite a long to get a deactivated process back into action. CPU load can be tricky for single-threaded processes and multi-threaded processes. Single threaded processes can only run on one CPU at any time. CPU load can also make the processes to look like stopped where in fact they are actually waiting to get the scheduler to take care of them. Generally cpu and memory shortages can be felt by even users working on the system.

On the other hand, if the process is waiting on something (like Disk IO or a response from another network element), then you may find it not doing anything (sleeping) until it gets its request fulfilled. In this case, the system need not be short on CPU or memory resources.


-Sri