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From: =?utf-8?Q?Yannick_Duch=C3=AAne_=28Hibou57?=
 =?utf-8?Q?=29?=
 <yannick_duchene@yahoo.fr>
Newsgroups: comp.lang.ada
Subject: User Defined Storage Pool : did you ever experiment with it ?
Date: Sat, 22 Jan 2011 01:04:41 +0100
Organization: Ada @ Home
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Date: 2011-01-22T01:04:41+01:00
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Hi,

Ada has provision for user defined storage pool, that is, an application=
  =

may have a (or multiple) custom implementation of a heap or like for any=
  =

kind of object.
http://www.ida.liu.se/edu/ugrad/progkon/Ada/ada-doc/LRM95/rm95html/rm9x-=
13-11.html
(from an uknown site, AdaIC server seems down today)

I don't feel to remember I ever see a single Ada source with some use of=
  =

this. Is this just an not enough known feature, or does it mean there is=
  =

not so much benefit to use it ? Or else, may be this could be beneficial=
  =

but no one never go up to there (no evaluation of this option, or anythi=
ng  =

else) ?

Straightforwardly, I may think about some examples where this may be  =

beneficial (you may say if you agree or not):
* Avoid memory fragmentation due to objects of different size (one pool =
 =

with all object of the same size may limit the overall memory  =

fragmentation)
* Help the CPU cache to be more efficient (if a pool is created for the =
 =

most accessed type of objects, there may be grouped together in a single=
,  =

thus better use of CPU internal cache)
* Profit from noticeable behavior of some process, like one which most o=
f  =

time allocate/deallocate like a stack would while not being really a sta=
ck  =

(so could not be allocated on the stack).

Or may be basic containers just make user storage pool unnecessary ? (fo=
r  =

containers holding object values, not reference)
Or is the typical head implementation clever enough is all cases to avoi=
d  =

the need of user defined storage pools ?

Just wondered why, while memory resource is so much important, and user =
 =

defined storage pool does not look like an obscure feature, I've never  =

seen it at work in multiple sources I could read from the web.


-- =

Si les chats miaulent et font autant de vocalises bizarres, c=E2=80=99es=
t pas pour  =

les chiens.

=E2=80=9CI am fluent in ASCII=E2=80=9D [Warren 2010]