I was curious about Common Lisp's CFFI also, so I tried it out. [1] On my machine, the C version prints between 6855 and 6910. Using SBCL (cffi-bench:run 2000

I was curious about Common Lisp's CFFI also, so I tried it out. [1] On my machine, the C version prints between 6855 and 6910. Using SBCL (cffi-bench:run 2000000000) prints between 9185 and 9205. Clisp is significantly slower, and (cffi-bench:run 200000000) is already at 55500, compared to ~100 in SBCL. CCL crashes with a segmentation fault, and I'm still debugging. Tomorrow I'll see about creating a build script and opening a pull request to the main repo. [1] https://github.com/jl2/ffi-overhead/tree/master/common-lisp/cffi-bench/cffi-bench.lisp https://github.com/jl2/ffi-overhead/tree/master/common-lisp/... EDIT: I recompiled the .so and C program with -O3, and it now prints between 4740-4780. SBCL using the -O3 library prints 7935 and 8935.