Distributed Linux

Distributed Linux

[Prasad]

Hi all,
	the subject may be too ambitious, but thats not a prank i am 
playing... As a graduation project i intended to make linux distributed... 
by distributed i mean, enabling process migration, selecting eligible 
nodes, and ofcourse selecting candidate processes which would be migrated 
to the selected node.  The following is the description of how i intended 
to do and would like inputs/suggessions from the gurus here.

The processes would be dynamically migrated from one node to the other
based on the selections of local process (candidate) and the remote node.  
The entire task along with its memory map will be migrated on to the other
system (This system however would be later changed to migrate only
referenced pages).  The guest system (where the process originated) would
however have a pseudo process running on it, which would not take much
resources but would help in handling various signals/interrupts and in
handling system calls.  This method of handling helps is in migrating the
user mode execution (which is on an average greater than 75%) to some
other system on the network thus reducing the load on the guest system.

As of now i am trying to device a migration system where the system mode 
computation is mostly carried out on the tasks original system, as this 
simplifies the implementation and helps maintaining the speed and 
efficiency in cases where the distribution is not needed.

Prasad

-- 
Failure is not an option

Re: Distributed Linux

[Hacksaw]

> As a graduation project i intended to make linux distributed

You mean, like Mosix?

http://www.mosix.org/
-- 
Playing fast is easier than playing slow.
 
http://www.hacksaw.org -- http://www.privatecircus.com -- KB1FVD

Re: Distributed Linux

[Lars Marowsky-Bree]

On 2002-11-10T16:34:10,
   Prasad <prasad_s@gdit.iiit.net> said:

> As of now i am trying to device a migration system where the system mode 
> computation is mostly carried out on the tasks original system, as this 
> simplifies the implementation and helps maintaining the speed and 
> efficiency in cases where the distribution is not needed.

Look at OpenMosix and the Compaq Single System Image cluster stuff.


Sincerely,
    Lars Marowsky-Brée <lmb@suse.de>

-- 
Principal Squirrel 
SuSE Labs - Research & Development, SuSE Linux AG
  
"If anything can go wrong, it will." "Chance favors the prepared (mind)."
  -- Capt. Edward A. Murphy            -- Louis Pasteur

Re: Distributed Linux

[Aneesh Kumar K.V]

> As a graduation project i intended to make linux distributed 

This is what exactly  openSSI project does. http://ssic-linux.sf.net 

>The processes would be dynamically migrated from one node to the other
>based on the selections of local process (candidate) and the remote
>node. 

In the case of SSI the process to be migrated is selected  by using
mosix algorithm. If mosix load balancer is   not enabled automatic load
balancing doesn't work. But you can use the migrate() call with "best
node" argument  so that the average load  on the machine is used to
determine which node the process should migrate. 

>The entire task along with its memory map will be migrated on to the
>other system

SSI even support  mmap across cluster. That means you can  even ask a
process  that has done a mmap of file  to migrate to another node. 

>The guest system (where the process originated) would
>however have a pseudo process running on it, which would not take much
>resources but would help in handling various signals/

SSI support cluster wide signaling. That means you can send signal to a
process running on other node( you have cluster wide PID )

It also support cluster wide message queue, DLM , cluster wide device
access and  cluster wide IP. The developers are working on cluster wide
support for  semaphore shared memory  

NOTE:  it support three architectures. x86/IA64/Alpha

-aneesh