The JIT functions by Mark Raasveldt provide a powerful alternative approach to bring C and C++ code into MonetDB. I have provided an alternative implementation of the MonetDB-rmath extension using JIT functions.
The JIT implementation is considerably shorter and simpler, and slightly more general - where the code can deal with function arguments that are any combination of scalars and BATs. However, there are indications that the functions are considerably slower. As a minor point, I needed to rename the functions (e.g. using r_ as a prefix) -- otherwise the function names would collide with the function signatures in Rmath.h.
To use the JIT-based rmath extension:
git clone https://github.com/mclements/MonetDB-rmath.git git checkout jit make sudo make install monetdb create test monetdb release test monetdb set embedc=yes test mclient -d test -s "select r_pnorm(1.96,0,1);"
As a challenge for JIT-based extensions, new C functions (e.g. new functions that call Rmath.h, and for which we want to call the new functions in MonetDB) will need a header file that is available to MonetDB. A fragile (non-portable?) solution to find the MonetDB include folder is to use:
MONETDBINCLUDE = $(patsubst -I%,%,$(firstword $(shell pkg-config --cflags-only-I monetdb5)))
in the Makefile. This assumes that the MonetDB include folder is the first include folder in CFLAGS. The extension-specific header for any new functions can then be copied to that folder:
cp rmath_ext.h $(MONETDBINCLUDE)
I hope that this is useful.
Sincerely, Mark.