Hi Ralph,Jeff and all
Thank you ,Squyres , it is really useful !在 2010年7月7日 下午7:22，Jeff Squyres <firstname.lastname@example.org>写道：
On Jul 6, 2010, at 10:48 PM, 张晶 wrote:Is the command line of rlogin that much different than that of rsh/ssh? For example, can you just s/rsh/rlogin/ on the overall command line and have it just work?
> 1.If I write a rlogin component ,
If so, I suspect that tweaking the rsh plm might be far simpler than having your own component.
ODLS = ORTE Daemon Local launch Subsystem.
> can I just login in the node in the cluster and launch the process . If it is ,what the role the odls plays ??
PLM = Process Lifecycle Management.
Meaning: the PLM is used to launch orteds (more on this below) across multiple nodes. The ODLS is used to launch processes locally from the orted (e.g., via POSIX fork/exec).
Yes. The orted = ORTE daemon. It is almost always the first thing launched on each node and acts as a proxy for launching, killing, and monitoring the user's applications on each node. It also does other control kinds of things, like relay stdout/stderr back up to the HNP (more below), etc.
> 2.what is orted? Should the orted exists in every node and functions as a node process launch proxy ?
HNP = head node process, meaning mpirun (or actually, orterun -- mpirun is a symlink to orterun). The HNP functions as an orted as well, so it can use the ODLS to launch processes locally, etc.
> 3,what is hnp ? Is every job has only one hnp ,and when I use mpirun , the mpirun process is hnp ??
Ralph can provide more detail on all of the above, but these are the basics.
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