[SSI-devel] changes to "top" on OpenSSI

[Roopa P. <pra...@in...>]

Hi all,

Sometime back we had a discussion on this list for changes that are
required for "top" on OpenSSI. 
I am planning to implement a few of them. 

Below is the understanding of what changes to "top" are required.

"top" on ssi currently displays a mixture of clusterwide and local 
data. 

What is local info and what is not in existing "top" output:
------------------------------------------------------------
        1) Header section :
              uptime : local 
              load average : local 
              processes (sleeping, running, zombie and stopped)  :
              clusterwide
              CPU states: local 
              Mem : local
              Swap : local
                
        2) Processes : Shows clusterwide processes 

Clusterwide "top" for SSI:
--------------------------

        1) Default usage :
                   This would display clusterwide processes.
                   We cannot make the header info clusterwide as we
                   dont have a mechanism right now to read the proc
                   of a node remotely. Only means would be rexec or
                   something like that.
                
                   And displaying data of all node statistics in the 
                   header section of "top" would clutter the "top" 
                   window. 

                   Neither does keeping only the local data in the
                   header and displaying clusterwide processes sound
                   any good.

                   We are thinking of ripping off the "top" header of
                   all such fields that dont make good sense for
                   remote processes. Any other suggestions are most
                   welcome.
 
                   "top" uses the "local" /proc/meminfo file
                   to calculate %MEM for the remote processes,
                   which is wrong. We are not targeting at fixing
                   this right away. Am not sure, but we may hide the 
                   %MEM column in the output.

         2) The new top will support --shownode option that 
            would display a "NODE" column showing the execution 
            node of a process.
 
         3) top when run in localview mode (localview top) would show
            a normal top output with the headers and everything else,
            except that it will not show remote processes. 


Has anyone been seeing any problems with "top" on the ssi cluster ? Any
suggestions on the above are most welcome. And Also if any of the things
in the new implementation mentioned above would cause any problems. 

Thanks,
Roopa