[uml-devel] demo of SBUML - swsusp functionality for UML

[uml-devel] demo of SBUML - swsusp functionality for UML

[Richard Potter]

Dear UML developers:

We have been working on a type of software suspend and restore for
UML.  Eventually it will be announced and hosted at
sbuml.sourceforge.net, however while that site is being prepared, it
seems appropriate for people on this User-mode-linux-devel mailing
to have a chance to try out the system in its present form.

If you would like, you can download a demo from:
http://sbuml.sourceforge.net/demo-for-umldev-list.html

Source code for the scripts is included in the demo.  Source code for
the binary will be available soon.

SBUML was created to support research in "Computation Scrapbook" based
programming tools and to support research in model checking.
(http://hagi.is.s.u-tokyo.ac.jp/members/potter/pubs/) There are also
potentially many other applications.  However, our short term
development (and bug fixing) focus will be using SBUML to distribute
pre-configured runtime state.  Potential users might include software
developers who wish to prepare demos without bothering potential users
with setup instructions, teachers of programming who want to distribute
debugging scenarios to students, or software users who would like
provide detailed bug reports (super core dumps :-) to developers.

To make this more practical, it should be possible to run SBUML on
many different distributions of host Linux.  Therefore a high-priority
task will be to understand exactly what host details SBUML and the
snapshots depend on.  Hopefully most of these dependencies can be
removed.  For dependencies that remain, a simple tool should be
developed so potential users can quickly test if SBUML or a particular
set of snapshots will work with their host Linux.  At this time, the
only way to find out is to download the system and give it a try.....

For now, please post questions/comments about SBUML in this
User-mode-linux-devel mailing list.  If traffic becomes excessive,
maybe we can move discussions over to a mailing list at
sbuml.sourceforge.net.

--Richard

The readme.txt file:

This is a quick readme file to give people already familiar with
User-Mode Linux enough information to play with SBUML a bit.  More
information, simple manuals, and sample snapshots will be posted 
at http://sbuml.sourceforge.net

What is SBUML?
==============

SBUML is an extension to User-mode Linux (UML) for saving and
restoring UML state in mid-execution. It provides a *computation
ScrapBook* for UML that can be used to distribute/migrate
pre-configured runtime state and aid debugging activities.  It can
be used for swsusp.

It it based on UML version 2.4.18-36, and thus only supports the tt
mode of UML.  After releasing this demo, the highest priority task
will be to update SBUML to work with the latest UML kernel.  Only one
post-2.4.18-26 bug fix has been patched in, which was the that makes
UML run on RedHat 9.0.

What should be known before running the SBUML demo?
===================================================

1) It requires about 1.5gig to 2.0gig of hard disk space.  
2) All file changes will be in the demo's "sbumldemo" directory
   and subdirectories.  Removing this directory tree should uninstall
   the demo and all side effects, except for a few small files in /tmp.
3) It has been run successfully on hosts with RedHat 7.2, 8.0, and 9.0.  
   It is more likely to work if you have vncviewer, curl, xdelta, and 
   nc (netcat) installed, because any library incompatibilities with 
   the binaries included in the demo will be avoided.
4) The demo will grab IP addresses on your subnet.  For example, if
   the host's IP is 192.168.1.90, SBUML will assign restored machines
   addresses like 192.168.1.22, 192.168.1.23, etc.  (Addresses that
   respond to pings will automatically be skipped.)  Therefore, the
   current demo is only suitable for running on a subnet that you own.
   (This whole scheme needs to be replaced with something more polite and
   reliable.)
5) It runs fine with Linux hosts running inside of VMWare.  Therefore 
   running VMWare's NAT network will avoid most potential problems with
   item #4.
6) The two most essential commands are: 
   1- sbumlhalt -all   #this will clean up all SBUML machines and their directories
   2- sbuml--kill-all-xterm-linux   # a very aggressive scan of /proc to kill any
         processes that *seems* to be related to SBUML, because sbumlhalt sometimes
         misses a few.  If you have any non-SBUML UMLs running, it will probably kill
         them too.
7) A few known bugs that you might run into:
   1- Only one xterm console window can be saved into a snapshot.
   2- SIGWINCH has been disabled, so resizing the xterm windows does not work right.
   3- Xterm state is not saved. (this is an intentional limitation, not a bug)
   4- Some versions of ping do not support the -w timeout parameter, which hangs
      the sbumlvnc script.
   5- The technique used to update /etc/resolv.conf in a UML can be unreliable and
      needs to be replaced.  Firewall settings on the host can make it fail.
   6- Failed snapshot downloads are not handled gracefully

How do you download/install it?
===============================

SBUML is packed as a demo in 4 files with these or similar names:
sbuml-core-2.4.18-36um-2sb-b.tarz (800KB)
  --the specially built UML binary and high-level control scripts.
sbumldemo-bases.tar.gz (220MB)
  --backing files for a UML running a small RedHat 7.2 distribution
sbumldemo-snapshots-120503.tar.gz (65MB)
  --example snapshots of running UMLs
sbumldemo-support-bin-redhat72-120503.tar.gz (294KB)
  --binaries that *might* make it easier for some people to get
    sbuml working on their Linux Host installation.  The xdelta and
    vncviewer binaries seem to be quite portable.  curl and nc are more
    troublesome. (Please tell me if you know how to build a portable 
    curl or nc.)

To install:
(1) untar all the files.  
(2) cd into the sbumldemo directory
(3) execute ./sbumlinitdemo

With just a little luck, downloading and untaring can be automated by
downloading the small file named "sbuml-download-and-install-script-xxxxxxx"
and typing 
$ source sbuml-download-and-install-script-xxxxxxx
If you mirror the demo, please be sure to change the download path in this file.

Then just read the short messages carefully.  It will probably ask you
to execute ./scripts/install_uml_net_as_root in a root shell to give
uml_net root privileges.  If you want, you can alternatively copy an
older version of uml_net into the ./scripts directory.  Recently I noticed
that the latest build of uml_net did not work, but I have not had time
to find out why.


How do you run it quickly?
==========================

After you have run ./sbumlinitdemo and have a 
"[(sbumldemo subshell) cur-dir] $" prompt, execute 
the "sbumlquick" command.  You will then get
something like this:

[(sbumldemo subshell) sbumldemo]$ sbumlquick 
1) /home/test/doit/sbumldemo/scripts/../snapshots/rh72-32m-f7185deab716119d
2) /home/test/doit/sbumldemo/scripts/../snapshots/rh72-32m-vnc-800x600-41ab54e69365d2cc
3) /home/test/doit/sbumldemo/scripts/../snapshots/rh72-64m-kde-800x600-2e5a7cfde430c80e
4) /home/test/doit/sbumldemo/scripts/../snapshots/rh72-64m-vnc-800x600-d18f29698f8c071c
5) /home/test/doit/sbumldemo/scripts/../snapshots/rh72-96m-kde-800x600-a3551ca7e09e2300
6) /home/test/doit/sbumldemo/scripts/../snapshots/rh72-96m-vnc-800x600-8e19871e9036a776
#? 

The snapshots in the default snapshot directory are listed.  Enter 1
(for the "rh72-32m-f7185deab716119d" snapshot) and return and soon (3
to 30 seconds, certainly within 60 seconds), a new xterm should open
with a 32meg machine prebooted.  Press return to see the login prompt.

Snapshots with vnc or kde in the name will try to assign an IP
address and connect vncviewer to a gui in the UML, so these really
require compatible versions of nc, xdelta, and vncviewer to be on the
shell path.

The "sbumlhalt -all" should be used to remove the machines.

What other commands are there to play with?
===========================================

All the commands are implemented as bash scripts in the ./scripts
directory, so reading through those may give some clues.  However,
here are the main ones presented as an example scenario:

[(sbumldemo subshell) sbumldemo]$ sbumlboot m1  
  --This command boots a new machine and call it m1
  --After the machine boots, log in as root using "root" as the password.
  --Start some eye candy to make the demo more interesting, e.g. run
    the "top" command.
[(sbumldemo subshell) sbumldemo]$ sbumlfreeze m1
  --This command freezes the top command's updates (and the whole UML)
[(sbumldemo subshell) sbumldemo]$ sbumlcontinue m1
  --This command continues the top command's updates (and the whole UML)
[(sbumldemo subshell) sbumldemo]$ sbumlsave m1 topuml -f -c
  --This command makes a snapshots of the UML's state and saves it as "topuml"
  --(The -f means "freeze first", and the -c means "continue after")
[(sbumldemo subshell) sbumldemo]$ sbumlrestore m2 topuml -c
  --This command starts another machine called "m2" using the state in topuml.
  --(The -c means "continue after restoring")
[(sbumldemo subshell) sbumldemo]$ sbumlrestore m topuml -c
  --Same as above, only the machine name is chosen automatically to be
    the first free machine name of the form m followed by some integer.
[(sbumldemo subshell) sbumldemo]$ sbumlquick topuml
  --Same as above, just easier to type.
[(sbumldemo subshell) sbumldemo]$ sbumlquick topuml ; sbumlquick topuml ; sbumlquick topuml ; 
  --Quickly create three more copies...just for the fun of it.
[(sbumldemo subshell) sbumldemo]$ sbumlhalt m1
  --This command gets rid of the original UML machine that was booted from scratch
[(sbumldemo subshell) sbumldemo]$ sbumlhalt -all
  --This command gets rid of the rest of the running UMLs
[(sbumldemo subshell) sbumldemo]$ sbuml--kill-all-xterm-linux
  --This command will kill off any stubborn UML processes that did not
    listen to sbumlhalt, which should not be many, if any.

How reliable is it?
===================

There is really not enough experience or rigorous testing to know yet.
However, what experience there is indicates that a saved snapshot will
usually restore into a machine that will continue running successfully.
Occasionally, a snapshot will not restore.  However, once a snapshot
has been successfully restored once, it (almost?) always will restore
successfully every time thereafter.

One conclusion from all this is that if you want to use it for typical
software suspend and resume functionality (swsusp), make sure you can
successfully restore the snapshot *before* halting the original machine.

Acknowledgments
===============

SBUML was supported in part by a Grant-in-Aid for Precursory Research
for Embryonic Science and Technology (PRESTO), from Japan Science and
Technology Agency (JST).  Addition support has been provided by the
Exploratory Software Project of the Information-technology Promotion
Agency (IPA).  Study of Jeff Dike's UML code (with all its trampolines
and other interesting techniques) was done jointly with Osamu Sato and
Professor Masami Hagiya of Tokyo University.  Important portions of
the current code were written by Osamu Sato.  Mitsuharu Yamamoto helped
with testing and provided needed Linux expertise.

Special acknowledgments must be given to Jeff Dike, for creating the
UML system, and Greg Lonnon, who contributed UML's original
copy-on-write(COW) feature, which has been essential for making
snapshots small enough to be practical.

Contact
=======

Richard Potter
suml at zar.att.nt.jp
potter at is.s.u-tokyo.ac.jp

Last edited: 12-12-2003





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Re: [uml-devel] demo of SBUML - swsusp functionality for UML

[roland]

hey this is GREAT!
i`m currently downloading the whole stuff and give it a try.

> UML.  Eventually it will be announced and hosted at
> sbuml.sourceforge.net
can you explain why it will be hosted as an extra project? i just see it as additional feature for uml - so why somewhat "forking" ?
just independence?

>Potential users might include software
> developers who wish to prepare demos without bothering potential users
> with setup instructions, teachers of programming who want to distribute
> debugging scenarios to students, or software users who would like
> provide detailed bug reports (super core dumps :-) to developers.
and security experts can snapshot infected honeypot UML`s and transfer them
to other experts for analysis :D

regards
roland




----- Original Message ----- 
From: "Richard Potter" <sbuml-deletethispart@zar.att.ne.jp>
To: <user-mode-linux-devel@lists.sourceforge.net>
Sent: Saturday, December 13, 2003 5:07 AM
Subject: [uml-devel] demo of SBUML - swsusp functionality for UML


> Dear UML developers:
>
> We have been working on a type of software suspend and restore for
> UML.  Eventually it will be announced and hosted at
> sbuml.sourceforge.net, however while that site is being prepared, it
> seems appropriate for people on this User-mode-linux-devel mailing
> to have a chance to try out the system in its present form.
>
> If you would like, you can download a demo from:
> http://sbuml.sourceforge.net/demo-for-umldev-list.html
>
> Source code for the scripts is included in the demo.  Source code for
> the binary will be available soon.
>
> SBUML was created to support research in "Computation Scrapbook" based
> programming tools and to support research in model checking.
> (http://hagi.is.s.u-tokyo.ac.jp/members/potter/pubs/) There are also
> potentially many other applications.  However, our short term
> development (and bug fixing) focus will be using SBUML to distribute
> pre-configured runtime state.  Potential users might include software
> developers who wish to prepare demos without bothering potential users
> with setup instructions, teachers of programming who want to distribute
> debugging scenarios to students, or software users who would like
> provide detailed bug reports (super core dumps :-) to developers.
>
> To make this more practical, it should be possible to run SBUML on
> many different distributions of host Linux.  Therefore a high-priority
> task will be to understand exactly what host details SBUML and the
> snapshots depend on.  Hopefully most of these dependencies can be
> removed.  For dependencies that remain, a simple tool should be
> developed so potential users can quickly test if SBUML or a particular
> set of snapshots will work with their host Linux.  At this time, the
> only way to find out is to download the system and give it a try.....
>
> For now, please post questions/comments about SBUML in this
> User-mode-linux-devel mailing list.  If traffic becomes excessive,
> maybe we can move discussions over to a mailing list at
> sbuml.sourceforge.net.
>
> --Richard
>
> The readme.txt file:
>
> This is a quick readme file to give people already familiar with
> User-Mode Linux enough information to play with SBUML a bit.  More
> information, simple manuals, and sample snapshots will be posted
> at http://sbuml.sourceforge.net
>
> What is SBUML?
> ==============
>
> SBUML is an extension to User-mode Linux (UML) for saving and
> restoring UML state in mid-execution. It provides a *computation
> ScrapBook* for UML that can be used to distribute/migrate
> pre-configured runtime state and aid debugging activities.  It can
> be used for swsusp.
>
> It it based on UML version 2.4.18-36, and thus only supports the tt
> mode of UML.  After releasing this demo, the highest priority task
> will be to update SBUML to work with the latest UML kernel.  Only one
> post-2.4.18-26 bug fix has been patched in, which was the that makes
> UML run on RedHat 9.0.
>
> What should be known before running the SBUML demo?
> ===================================================
>
> 1) It requires about 1.5gig to 2.0gig of hard disk space.
> 2) All file changes will be in the demo's "sbumldemo" directory
>    and subdirectories.  Removing this directory tree should uninstall
>    the demo and all side effects, except for a few small files in /tmp.
> 3) It has been run successfully on hosts with RedHat 7.2, 8.0, and 9.0.
>    It is more likely to work if you have vncviewer, curl, xdelta, and
>    nc (netcat) installed, because any library incompatibilities with
>    the binaries included in the demo will be avoided.
> 4) The demo will grab IP addresses on your subnet.  For example, if
>    the host's IP is 192.168.1.90, SBUML will assign restored machines
>    addresses like 192.168.1.22, 192.168.1.23, etc.  (Addresses that
>    respond to pings will automatically be skipped.)  Therefore, the
>    current demo is only suitable for running on a subnet that you own.
>    (This whole scheme needs to be replaced with something more polite and
>    reliable.)
> 5) It runs fine with Linux hosts running inside of VMWare.  Therefore
>    running VMWare's NAT network will avoid most potential problems with
>    item #4.
> 6) The two most essential commands are:
>    1- sbumlhalt -all   #this will clean up all SBUML machines and their directories
>    2- sbuml--kill-all-xterm-linux   # a very aggressive scan of /proc to kill any
>          processes that *seems* to be related to SBUML, because sbumlhalt sometimes
>          misses a few.  If you have any non-SBUML UMLs running, it will probably kill
>          them too.
> 7) A few known bugs that you might run into:
>    1- Only one xterm console window can be saved into a snapshot.
>    2- SIGWINCH has been disabled, so resizing the xterm windows does not work right.
>    3- Xterm state is not saved. (this is an intentional limitation, not a bug)
>    4- Some versions of ping do not support the -w timeout parameter, which hangs
>       the sbumlvnc script.
>    5- The technique used to update /etc/resolv.conf in a UML can be unreliable and
>       needs to be replaced.  Firewall settings on the host can make it fail.
>    6- Failed snapshot downloads are not handled gracefully
>
> How do you download/install it?
> ===============================
>
> SBUML is packed as a demo in 4 files with these or similar names:
> sbuml-core-2.4.18-36um-2sb-b.tarz (800KB)
>   --the specially built UML binary and high-level control scripts.
> sbumldemo-bases.tar.gz (220MB)
>   --backing files for a UML running a small RedHat 7.2 distribution
> sbumldemo-snapshots-120503.tar.gz (65MB)
>   --example snapshots of running UMLs
> sbumldemo-support-bin-redhat72-120503.tar.gz (294KB)
>   --binaries that *might* make it easier for some people to get
>     sbuml working on their Linux Host installation.  The xdelta and
>     vncviewer binaries seem to be quite portable.  curl and nc are more
>     troublesome. (Please tell me if you know how to build a portable
>     curl or nc.)
>
> To install:
> (1) untar all the files.
> (2) cd into the sbumldemo directory
> (3) execute ./sbumlinitdemo
>
> With just a little luck, downloading and untaring can be automated by
> downloading the small file named "sbuml-download-and-install-script-xxxxxxx"
> and typing
> $ source sbuml-download-and-install-script-xxxxxxx
> If you mirror the demo, please be sure to change the download path in this file.
>
> Then just read the short messages carefully.  It will probably ask you
> to execute ./scripts/install_uml_net_as_root in a root shell to give
> uml_net root privileges.  If you want, you can alternatively copy an
> older version of uml_net into the ./scripts directory.  Recently I noticed
> that the latest build of uml_net did not work, but I have not had time
> to find out why.
>
>
> How do you run it quickly?
> ==========================
>
> After you have run ./sbumlinitdemo and have a
> "[(sbumldemo subshell) cur-dir] $" prompt, execute
> the "sbumlquick" command.  You will then get
> something like this:
>
> [(sbumldemo subshell) sbumldemo]$ sbumlquick
> 1) /home/test/doit/sbumldemo/scripts/../snapshots/rh72-32m-f7185deab716119d
> 2) /home/test/doit/sbumldemo/scripts/../snapshots/rh72-32m-vnc-800x600-41ab54e69365d2cc
> 3) /home/test/doit/sbumldemo/scripts/../snapshots/rh72-64m-kde-800x600-2e5a7cfde430c80e
> 4) /home/test/doit/sbumldemo/scripts/../snapshots/rh72-64m-vnc-800x600-d18f29698f8c071c
> 5) /home/test/doit/sbumldemo/scripts/../snapshots/rh72-96m-kde-800x600-a3551ca7e09e2300
> 6) /home/test/doit/sbumldemo/scripts/../snapshots/rh72-96m-vnc-800x600-8e19871e9036a776
> #?
>
> The snapshots in the default snapshot directory are listed.  Enter 1
> (for the "rh72-32m-f7185deab716119d" snapshot) and return and soon (3
> to 30 seconds, certainly within 60 seconds), a new xterm should open
> with a 32meg machine prebooted.  Press return to see the login prompt.
>
> Snapshots with vnc or kde in the name will try to assign an IP
> address and connect vncviewer to a gui in the UML, so these really
> require compatible versions of nc, xdelta, and vncviewer to be on the
> shell path.
>
> The "sbumlhalt -all" should be used to remove the machines.
>
> What other commands are there to play with?
> ===========================================
>
> All the commands are implemented as bash scripts in the ./scripts
> directory, so reading through those may give some clues.  However,
> here are the main ones presented as an example scenario:
>
> [(sbumldemo subshell) sbumldemo]$ sbumlboot m1
>   --This command boots a new machine and call it m1
>   --After the machine boots, log in as root using "root" as the password.
>   --Start some eye candy to make the demo more interesting, e.g. run
>     the "top" command.
> [(sbumldemo subshell) sbumldemo]$ sbumlfreeze m1
>   --This command freezes the top command's updates (and the whole UML)
> [(sbumldemo subshell) sbumldemo]$ sbumlcontinue m1
>   --This command continues the top command's updates (and the whole UML)
> [(sbumldemo subshell) sbumldemo]$ sbumlsave m1 topuml -f -c
>   --This command makes a snapshots of the UML's state and saves it as "topuml"
>   --(The -f means "freeze first", and the -c means "continue after")
> [(sbumldemo subshell) sbumldemo]$ sbumlrestore m2 topuml -c
>   --This command starts another machine called "m2" using the state in topuml.
>   --(The -c means "continue after restoring")
> [(sbumldemo subshell) sbumldemo]$ sbumlrestore m topuml -c
>   --Same as above, only the machine name is chosen automatically to be
>     the first free machine name of the form m followed by some integer.
> [(sbumldemo subshell) sbumldemo]$ sbumlquick topuml
>   --Same as above, just easier to type.
> [(sbumldemo subshell) sbumldemo]$ sbumlquick topuml ; sbumlquick topuml ; sbumlquick topuml ;
>   --Quickly create three more copies...just for the fun of it.
> [(sbumldemo subshell) sbumldemo]$ sbumlhalt m1
>   --This command gets rid of the original UML machine that was booted from scratch
> [(sbumldemo subshell) sbumldemo]$ sbumlhalt -all
>   --This command gets rid of the rest of the running UMLs
> [(sbumldemo subshell) sbumldemo]$ sbuml--kill-all-xterm-linux
>   --This command will kill off any stubborn UML processes that did not
>     listen to sbumlhalt, which should not be many, if any.
>
> How reliable is it?
> ===================
>
> There is really not enough experience or rigorous testing to know yet.
> However, what experience there is indicates that a saved snapshot will
> usually restore into a machine that will continue running successfully.
> Occasionally, a snapshot will not restore.  However, once a snapshot
> has been successfully restored once, it (almost?) always will restore
> successfully every time thereafter.
>
> One conclusion from all this is that if you want to use it for typical
> software suspend and resume functionality (swsusp), make sure you can
> successfully restore the snapshot *before* halting the original machine.
>
> Acknowledgments
> ===============
>
> SBUML was supported in part by a Grant-in-Aid for Precursory Research
> for Embryonic Science and Technology (PRESTO), from Japan Science and
> Technology Agency (JST).  Addition support has been provided by the
> Exploratory Software Project of the Information-technology Promotion
> Agency (IPA).  Study of Jeff Dike's UML code (with all its trampolines
> and other interesting techniques) was done jointly with Osamu Sato and
> Professor Masami Hagiya of Tokyo University.  Important portions of
> the current code were written by Osamu Sato.  Mitsuharu Yamamoto helped
> with testing and provided needed Linux expertise.
>
> Special acknowledgments must be given to Jeff Dike, for creating the
> UML system, and Greg Lonnon, who contributed UML's original
> copy-on-write(COW) feature, which has been essential for making
> snapshots small enough to be practical.
>
> Contact
> =======
>
> Richard Potter
> suml at zar.att.nt.jp
> potter at is.s.u-tokyo.ac.jp
>
> Last edited: 12-12-2003
>
>
>
>
>
> -------------------------------------------------------
> This SF.net email is sponsored by: IBM Linux Tutorials.
> Become an expert in LINUX or just sharpen your skills.  Sign up for IBM's
> Free Linux Tutorials.  Learn everything from the bash shell to sys admin.
> Click now! http://ads.osdn.com/?ad_id=1278&alloc_id=3371&op=click
> _______________________________________________
> User-mode-linux-devel mailing list
> User-mode-linux-devel@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/user-mode-linux-devel
>



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Become an expert in LINUX or just sharpen your skills.  Sign up for IBM's
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Re: [uml-devel] demo of SBUML - swsusp functionality for UML

[Richard Potter]

> hey this is GREAT!
> i`m currently downloading the whole stuff and give it a try.

If you have any problems with the demo, let me know what Linux host you
are testing it on.

> 
> > UML.  Eventually it will be announced and hosted at
> > sbuml.sourceforge.net
> can you explain why it will be hosted as an extra project? 
> i just see it as additional feature for uml - so why somewhat "forking" ?
> just independence?

This is a good question.  As for the core functionality (i.e. sbumlsave
and sbumlrestore), I hope it will be merged into the UML project code.
For now, the SBUML project can be a safe place to debug the core
functionality until it is stable enough and meets Jeff's standards.  (Or
someone may re-implement this functionality in a totally different way
for the UML project, in which case the SBUML project may adopt that code.)

In addition, the overall goal of SBUML is to support what we have been
calling "Computation Scrapbook" and "Snapshot Programming" ideas. SBUML
basically makes a UML machine act like a first-class programming object.
The SBUML project will explore the higher-level programs/scripts that
this makes possible.  Some of these programs/scripts will require
extended functionality for controlling the UML that might not be of
general interest to other UML users.  For example, our work with model
checking requires scripts to externally control the scheduling order of
processes in a UML machine.  So the SBUML project will do more than add
just one "addition feature" to UML.  It will also be adding various
experimental high-level scripts and extended functionality to support
them.

At this point, I think independence will be valuable, although I hope we
can keep the forking minimal as we confirm where the projects' goals
overlap.

> 
> >Potential users might include software
> > developers who wish to prepare demos without bothering potential users
> > with setup instructions, teachers of programming who want to distribute
> > debugging scenarios to students, or software users who would like
> > provide detailed bug reports (super core dumps :-) to developers.
> and security experts can snapshot infected honeypot UML`s and transfer them
> to other experts for analysis :D
> 
Somebody told me he wants to use it for pre-configuring a bunch of IRC
clients to stress test a server he is setting up.

--Richard




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Re: [uml-devel] demo of SBUML - swsusp functionality for UML

[BlaisorBlade]

Alle 05:07, sabato 13 dicembre 2003, Richard Potter ha scritto:
> Dear UML developers:
>
> We have been working on a type of software suspend and restore for
> UML.  Eventually it will be announced and hosted at
> sbuml.sourceforge.net, however while that site is being prepared, it
> seems appropriate for people on this User-mode-linux-devel mailing
> to have a chance to try out the system in its present form.
Sorry, I've a question: how is this project related with swsusp? Should they 
do the same thing? Or different ones?

Bye
-- 
cat <<EOSIGN
Paolo Giarrusso, aka Blaisorblade
Linux Kernel 2.4.21/2.6.0-test on an i686; Linux registered user n. 292729
EOSIGN



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Re: [uml-devel] demo of SBUML - swsusp functionality for UML

[Richard Potter]

>>> Sorry, I've a question: how is this project related with swsusp? 

The short answer is that SBUML does not use any code from swsusp and works today.

>>Should they do the same thing? Or different ones?

One answer is that swsusp was designed to save *one temporary*
snapshot of a notebook computer's state.  In contrast, SBUML saves
*multiple persistent* snapshots of a UML's state.  However, maybe this
is not such an interesting difference, since there must be an easy way
to have swsusp save its data to some location that will survive
multiple save and restore operations.  (Does anybody know of a swsusp
implementation that will save multiple snapshots of a machine
including hard disks at various points in time?)

Another answer is that it is important for SBUML to restore the image
of the UML as exactly as possible, because it is meant to support
programming tools.  For example, it should be possible to be in the
middle of doing kernel debugging, save a snapshot, and continue
debugging with confidence with the snapshot resumed into another UML,
possibly on another physical host machine.  (Unfortunately, the
current version of SBUML does not save the connection to GDB, so this
demo is not quite ready...however it will be in future releases.)

As far as I can tell, swsusp is intended for continuing user sessions,
so it is OK for swsusp to use techniques that might change the kernel
state and other hidden state as long as the changes are transparent
to end users. 

--Richard





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