[boost] [Boost-bugs] [ boost-Bugs-995270 ] perfomance: memory cleanup for pool takes too long

From: SourceForge.net (noreply_at_[hidden])
Date: 2004-07-21 09:28:24

Bugs item #995270, was opened at 2004-07-21 07:28
Message generated for change (Tracker Item Submitted) made by Item Submitter
You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=107586&aid=995270&group_id=7586

Category: None
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Nobody/Anonymous (nobody)
Assigned to: Nobody/Anonymous (nobody)
Summary: perfomance: memory cleanup for pool takes too long

Initial Comment:
hi,

In my project I use boost::pool because I have to 
instantiate millions of object at the beginning of the 
application, and only get rid of the at termination time.

I noticed that when processing large data
(which may require 1Gb memory for the application while 
it is running)
the application may finish its processing approx after 10 
seconds.
the cleanup part (which consists only of calling the pool 
release methods on allocated objects)
on the other hand, takes many minutes
(I usually give up after 5 minutes)

debugging the code i noticed that the while loop in
the nextof function 
(of SIMPLE SEGREGATED STORAGE.HPP)

takes many iterations.
this leads me to the belief that the reason the cleanup 
takes too long is because trying to cleanup 1GB memory 
of million of objects at once causes 
pool to retain all its chunks in the hope of more 
allocations in the future
which in turns causes it to waste all computation on 
running to the end of (endless) lists in the nextof 
function

I will appreciate a suggestion on how to fix this
until a more permanent solution is applied to the pool 
library

thanks
aviad
aviadr_at_[hidden]

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