Not to mention anything that records TimeStamps or clock values...

-----Original Message-----
From: squeak-dev-bounces at lists.squeakfoundation.org
[mailto:squeak-dev-bounces at lists.squeakfoundation.org] On Behalf Of Martin
Troielli
Sent: 30 July 2007 4:32 pm
To: squeak-dev at lists.squeakfoundation.org
Subject: How to generate identically image file after snapshots


Hi All,

We have tried to produce the same (bit identically) image file after two  
consecutive snapshots. We start from a base image then, fileIn several  
files into it and finally, we just SmalltalkImage current snapshot: true  
andQuit: true. We need this to verify the image file generated by a  
third-party with a checksum by executing a script.
After trying several ways to get it (even by scripting the fileIn process  
and the snapshot), we found that the image files have, beside the  
timestamp differences, thousands of other differences and sometimes the  
snapshots have also size differeces.
We supose that this kind of issues may occur due to the GC activity. Are
this issues from the way GC process is changing dynamically the memory  
bytes? There is a way to inhibite this activity?
Attached are the scripts we use to produce the image files.

Many thanks in advance,
Martin Troielli