[Box-Admins] Re: SqueakSource

Tobias Pape Das.Linux at gmx.de
Mon Aug 26 22:22:18 UTC 2013


Am 27.08.2013 um 00:08 schrieb Chris Muller <ma.chris.m at gmail.com>:

> On Mon, Aug 26, 2013 at 3:52 PM, Tobias Pape <Das.Linux at gmx.de> wrote:
>> 
>> Am 26.08.2013 um 21:59 schrieb Chris Muller <ma.chris.m at gmail.com>:
>> 
>>>> 
>>>>> As Dave mentioned, the immediate priority is simply ensuring continued
>>>> operation of squeaksource.com.  He is heading up the transition to a new
>>>> server this week whether that's box3, box4 (Gandi) or a server hosted by
>>>> Robert's group.  If we cannot get it running on a new image and/or VM
>>>> immediately, we'll just have to deal with the crashes/lockups until we can.
>>>>> 
>>>>> While I think Squeak should host its own services, unfortunately what we
>>>> have right now is unacceptably dangerous.  It appears someone has hacked
>>>> our SqueakSource implementation to bypass its original design for
>>>> persistence to use "image-based" persistence.  Image-based persistence, in
>>>> itself, would be fine, except for the fact that our Linux-based SS system
>>>> scripts carelessly KILL the SS process by PID as a means of opening the
>>>> image under VNC -- potentially when the image could be in a half-saved
>>>> state!
>>>> 
>>>> Which SqS are you referring to? Fabrizio once send Andreas and Me a (then
>>>> current) image of the squeaksource.com (SS.C) and
>>>> IIRC, it just had VNC running, so you probably are referring to
>>>> source.squeak.org (S.S.O)?
>>> 
>>> Sorry, I also do not understand what you mean by the original design
>>>> being “hacked” for image-based persistence.
>>>> 
>>> 
>>> Yes, I was referring to SSO, which is running a slightly newer/forked
>>> version of SqueakSource and using the save-the-image persistence.
>> 
>> What do you exactly mean by save-the-image-persistence? I ask, as I carefully
>> hand-merged/back-ported/cross-ported features from SSO _and_ SSC to SS3 prior
>> to its alpha release.
> 
> As you know SSStorage encapsulates the behaviors needed for back-end
> storage support.
>      loadMonticello:from:  -- "Answer the binary contents of the
> original mcz file as a ByteArray."
>      loadRepository -- "Answer the root object of this SqueakSource
> instance, an instance of SSRepository."
>      saveMonticello:of:to: -- "Save the mcz file contents contained
> by aString."
>      saveRepository: -- "Save the root SSRepository object into
> persistent storage."
>      shutdown -- "shutdown hook"
> 
> The SqueakSource instance supporting SSO has no senders of
> #saveRepository: at all.  However in the image is a workspace
> entitled:  "How this image was created" with this script:
> 
> "Save the image periodically"
> guardian ifNotNil:[guardian terminate].
> guardian := [
>     [true] whileTrue:[
>          "Synchronized with Morphic please"
>          Smalltalk future snapshot: true andQuit: false.
>          (Delay forSeconds: 60 minutes asSeconds) wait
>     ].
> ] fork.
> 
> I think the reason for doing this was performance, since SSFilesystem
> does its work in the background, I'm not sure..

Ah I see. I should have known. #saveRepository: is gone/noop in SS3/GemStone
too, for obvious reasons.

> 
>>> Yes, I'd planned for each SSProject to have its own McModel instance, so
>>> access is allowed only through the existing Project level ACL.
>> 
>> sure, but do only acl-accessible versions get added to the McModel instance
>> or every 'reachable' ancestor?
> 
> Only the acl-accessible versions.  Just as each Project has its own
> directory when using a SSFilesystem, each Project has its own McModel
> when using a SSMagma.  There are no cross-links to objects for other
> Projects in either case.

But iirc, SqueakSource uses the in-image MCDefinition-cache, have you disabled that
for Magma?

Best
	-Tobias
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