I've been running multiple, separate Tikis (e.g., my.domain.edu/tiki1, my.domain.edu/tiki2, etc) on the same machine without incident for more than a year. After installing any version of 1.8 (and just for testing purposes), I have had terrible problems - and it's not a server config issue; I'm running Fedora Core 1 on one machine, and RedHat 8.0 on the other. If a 1.7* site and 1.8 site are accessed simultaneously on the same machine, httpd starts taking up 80 - 90% of CPU time, spawns way too many subprocesses, and eventually the whole system goes down with an out of memory error. No Apache or PHP error messages.
Thx in advance
Univ. of Virginia