Provokes garbage collection on (nearly) every memory allocation. Intended to ferret out memory protection bugs. Also makes R run very slowly, unfortunately.
logical; turning it on/off.
integer; run GC every
integer; number of allocations to wait before starting GC torture.
logical; do not release free objects for re-use: use with caution.
gctorture(TRUE) instructs the memory manager to force a
full GC on every allocation.
gctorture2 provides a more refined
interface that allows the start of the GC torture to be deferred and
also gives the option of running a GC only every
The third argument to
gctorture2 is only used if R has been
configured with a strict write barrier enabled. When this is the case
all garbage collections are full collections, and the memory manager
marks free nodes and enables checks in many situations that signal an
error when a free node is used. This can help greatly in isolating
unprotected values in C code. It does not detect the case where a
node becomes free and is reallocated. The
argument can be used to prevent such reallocation. This will cause
memory to grow and should be used with caution and in conjunction with
operating system facilities to monitor and limit process memory use.
gctorture2 can also be invoked via environment variables at the
start of the R session. R_GCTORTURE corresponds to the
step argument, R_GCTORTURE_WAIT to
Previous value of first argument.
Peter Dalgaard and Luke Tierney
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