Mario Roy has some excellent examples using alternate multiprocessing
methods, instead of threads.  Clone his repository and copy the files in the
"framebuffer" directory into this directory and run them.
./get-mce-demos
You may have to install extra prerequisites to get them to work, but they
allow for a single shared object usage, instead of opening a separate object
for each thread/process.
(You will need MCE and MCE::Hobo)