Forum OpenACS Q&A: Re: Upload large files on Aolserver - Is moving to Naviserver the only way?
If for some reason, you can't upgrade to 5.8.0 now, you can check for the differences (diff -r) between your version and the components of the oacs-5-8 branch, and grep for NaviServer. There are probably just a handful of changes.
Concerning bgdelivery: you can probably just upgrade xotcl-core to get this fixed. My first guess would be:
but advancing to newer versions buys you a lot of other advantages (e.g. use of the NaviServer build-in writer threads, which are much better than classical bgdelivery),
Hope, this helps,
I was giving a last try by switching the memory allocator to one which allows to reclaim the memory once used, as I could read around... just didn't want to migrate/reload data, but they're not a lot and won't be a big deal.