Use litespeed 2.0.7 pro with compiled lsapi php 5.0.4 with eaccelerator module on linux 2.6.12 and get errors in stderr.log: ... FATAL: erealloc(): Unable to allocate 2834581 bytes FATAL: erealloc(): Unable to allocate 2833360 bytes FATAL: emalloc(): Unable to allocate 7637501 bytes ... And amount of these lines is quite large. Btw, it's enough free RAM for that moment. So, what could be a reason of appearing such things? Thank you. P.S., hmm, i guess it's php bug (or feature ), but perhaps i should set some values in litespeed conf?