malloc options

[Doug Hardie]

I have a program that has run correctly since FreeBSD 3.7.  However,  
when upgrading the server to 7.0 I am encountering issues where values  
just seem to arbirtrarily change.  These values are all located in  
memory allocated by malloc.  Malloc was significantly changed with 7.0  
and reading through the malloc man page there are a number of flags  
that can be set with /etc/malloc.conf.  The default for that file is  
to not exist.  The man page does not indicate which settings are used  
in that situation.  After reading through it I get the feeling that  
the default settings for D and M are 'dM'.  Hence, to return to the  
older malloc aproach to see if the problems go away I would need to  
set "Dm".  But some of the descriptions seem to indicate that might  
not be correct.  What are the default settings?