Follow Techotopia on Twitter

On-line Guides
All Guides
eBook Store
iOS / Android
Linux for Beginners
Office Productivity
Linux Installation
Linux Security
Linux Utilities
Linux Virtualization
Linux Kernel
System/Network Admin
Programming
Scripting Languages
Development Tools
Web Development
GUI Toolkits/Desktop
Databases
Mail Systems
openSolaris
Eclipse Documentation
Techotopia.com
Virtuatopia.com

How To Guides
Virtualization
General System Admin
Linux Security
Linux Filesystems
Web Servers
Graphics & Desktop
PC Hardware
Windows
Problem Solutions
Privacy Policy

  




 

 

Postfix Documentation
Previous Page Home Next Page

Unreasonable behavior

Sometimes the behavior exhibited by Postfix just does not match the source code. Why can a program deviate from the instructions given by its author? There are two possibilities.

  • The compiler has erred. This rarely happens.

  • The hardware has erred. Does the machine have ECC memory?

In both cases, the program being executed is not the program that was supposed to be executed, so anything could happen.

There is a third possibility:

  • Bugs in system software (kernel or libraries).

Hardware-related failures usually do not reproduce in exactly the same way after power cycling and rebooting the system. There's little Postfix can do about bad hardware. Be sure to use hardware that at the very least can detect memory errors. Otherwise, Postfix will just be waiting to be hit by a bit error. Critical systems deserve real hardware.

When a compiler makes an error, the problem can be reproduced whenever the resulting program is run. Compiler errors are most likely to happen in the code optimizer. If a problem is reproducible across power cycles and system reboots, it can be worthwhile to rebuild Postfix with optimization disabled, and to see if optimization makes a difference.

In order to compile Postfix with optimizations turned off:

% make tidy
% make makefiles OPT=

This produces a set of Makefiles that do not request compiler optimization.

Once the makefiles are set up, build the software:

% make
% su
Password:
# make install

If the problem goes away, then it is time to ask your vendor for help.

Postfix Documentation
Previous Page Home Next Page