Many folks have reported problems with APC in Cool Stack 1.1 resulting in a SEGV in the CoolTools Forums.
The APC version in Cool Stack 1.1 is APC 3.0.11 and if enabled, extensions such as mysql, dtrace etc. fail with a SEGV. Media Wiki doesn't work either.
We have tested APC 3.0.14 and this version seems to work much better and I'm keeping my fingers crossed that it will work for you as well. Our performance testing doesn't show any substantial differences between 3.0.11 and 3.0.14. If you want to give it a try, simply download the correct file for your platform and rename it to apc.so in your php extensions directory[Read more...]