On 05/09/2006, at 11:39 PM, Nergal Dimitri wrote:
I got a few questions;
1.) Is the 'priocntl' utility used instead of the 'nice' utility,
or is it just another priority tool?
I got the feeling it's the same as 'nice'....
I can't remember where I saw this documented, but basically priocntl
is the preferred and native method of changing scheduling parameters
on solaris. The nice command is there for compatibility reasons but
provides far less control than priocntl. For example priocntl allow
selection of the scheduling class and class-specific parameters.
2.) Is Dynamic System Domains the same as zones? The description of
it feels like it's _almost_ the same, but more hardware
oriented division. (Link for DSD information?)
Not the same. DSDs (more commonly known simply as domains) are the
result of hardware level partitioning in the mid-rtange and high end
machines. Each runs it's own instance of an OS, potentially different
versions and has dedicated and isolated hardware. Zones are a
software partitioning of a single OS instance that requires no
hardware support but provides less in the way of OS-version and
harware-fault isolation. You can, of course run zones on a domain.
Argh.. sorry I've just been called away, so I'll have to leave your
other questions for others, or for later.
Boyd.
3.) What's the actual difference between changing user priority and
global priority? What happends if I change both to maximum (say
RT). Is the user priority less worth the global? If I as root
change the user priority, is there any point in changing the global
priority of the process/project?
4.) If I set a process/project to have a certain limit of memory
allocation, could this have positive effects on applications with
memory leaks? If the memory leaks cannot pass say 50Mb of memory,
can these 50Mb be allocated with non-usable memory (memory leaks)
so the actual memory usage gets even worse for the application?
And if I have have 4Gb of memory, and I set a limit of 3.5Gb to one
application that at a certain point only use 2Gb of the memory and
another application uses 2Gb. Then suddenly the first application
(the one with 3.5Gb limit) uses its full limit (3.5Gb), what
happends with the memory that the second application had allocated
(1.5Gb)? Does this memory get swapped to the HDD and the second
application only get access to the 500Mb memory thats left?
I hope you understand my questions even if they got a bit sloppy :)
Best Regards,
Nergal
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