[Pharo-dev] Large images reasons [WAS] Re: [Pharo-users] Pharo 2.0 with Seaside + DBXTalk + GlorpDBX + Magritte 3 + TWBS is getting slower and slower

Marcus Denker marcus.denker at inria.fr
Mon Aug 19 08:29:41 EDT 2013


On Aug 3, 2013, at 2:13 AM, Eliot Miranda <eliot.miranda at gmail.com> wrote:

> Hi Marcus,
> 
> On Thu, Aug 1, 2013 at 12:33 AM, Marcus Denker <marcus.denker at inria.fr> wrote:
>> 
>> On Aug 1, 2013, at 8:56 AM, Stéphane Ducasse <stephane.ducasse at inria.fr> wrote:
>> 
>>> since years marcus is telling that MC storing ancestor information is doomed but we do not have something to really replace it.
>>> 
>> 
>> This is yet another thing.
>> 
>> Monticello keep all history data of all package in image, this is not a cache. When you delete it, your package loses
>> it's history and you can not merge anymore.
>> 
>> MCVersionInfo allInstances do: [ :each | each instVarNamed: 'ancestors' put: nil ].
> 
> When I looked at this I noticed that there was lots of duplicate
> entries in the ancestry list.  I *think* this happens on merge.  I
> think one ends up with each of the ancestries of the merged packages
> after a merge, i.e. when merging near the head one effectively doubles
> the ancestry.  I think Monticello should unique the ancestry, either
> after a merge, or better still, before saving.  This I think will
> shrink the space taken by ancestry significantly.
> 
Ahh… that explains why it wastes so much memory.

> I have some code handy if you'd like, but its not a hard thing to do.
> 
If you have it I would be interested… 

I have added the information to 

	https://pharo.fogbugz.com/f/cases/2711

	Marcus

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