from shell:

> while( 1 ) db.eval("3+3");

goes up a gigabyte every few minutes on the mongod

these build options were used:

$ svn update -r 8669
$ scons env="PATH:%PATH%,INCLUDE:%INCLUDE%,LIB:%LIB%" arch=x64
$ cd ../mongo
$ scons --usev8 --release --64

this was tested on windows. the private bytes stat is the statistic that was being watched.