Request: Increasing MAX_NUM_DLLS in Rdynload.c
On reason for hitting the MAX_NUM_DLLS (= 100) limit is because some packages don't unload their DLLs when they being unloaded themselves. In other words, there may be left-over DLLs just sitting there doing nothing but occupying space. You can remove these, using: R.utils::gcDLLs() Maybe that will help you get through your tests (as long as you're unloading packages). gcDLLs() will look at base::getLoadedDLLs() and its content and compare to loadedNamespaces() and unregister any "stray" DLLs that remain after corresponding packages have been unloaded. I think it would be useful if R CMD check would also check that DLLs are unregistered when a package is unloaded (https://github.com/HenrikBengtsson/Wishlist-for-R/issues/29), but of course, someone needs to write the code / a patch for this to happen. /Henrik On Mon, Dec 19, 2016 at 6:01 PM, Steve Bronder
<sbronder at stevebronder.com> wrote:
This is a request to increase MAX_NUM_DLLS in Rdynload.c in from 100 to 500.
On line 131 of Rdynload.c, changing
#define MAX_NUM_DLLS 100
to
#define MAX_NUM_DLLS 500
In development of the mlr package, there have been several episodes in the
past where we have had to break up unit tests because of the "maximum
number of DLLs reached" error. This error has been an inconvenience that is
going to keep happening as the package continues to grow. Is there more
than meets the eye with this error or would everything be okay if the above
line changes? Would that have a larger effect in other parts of R?
As R grows, we are likely to see more 'meta-packages' such as the
Hadley-verse, caret, mlr, etc. need an increasing amount of DLLs loaded at
any point in time to conduct effective unit tests. If MAX_NUM_DLLS is set
to 100 for a very particular reason than I apologize, but if it is possible
to increase MAX_NUM_DLLS it would at least make the testing at mlr much
easier.
I understand you are all very busy and thank you for your time.
Regards,
Steve Bronder
Website: stevebronder.com
Phone: 412-719-1282
Email: sbronder at stevebronder.com
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