mirror of
git://gcc.gnu.org/git/gcc.git
synced 2024-12-21 21:58:44 +08:00
5a2586cf8f
* Makefile.am, acinclude.m4, configure.in: Imported GC 6.0 and merged local changes. From-SVN: r44994
45 lines
2.0 KiB
Plaintext
45 lines
2.0 KiB
Plaintext
The garbage collector looks at a number of environment variables which are
|
|
the used to affect its operation. These are examined only on Un*x-like
|
|
platforms.
|
|
|
|
GC_INITIAL_HEAP_SIZE=<bytes> - Initial heap size in bytes. May speed up
|
|
process start-up.
|
|
|
|
GC_LOOP_ON_ABORT - Causes the collector abort routine to enter a tight loop.
|
|
This may make it easier to debug, such a process, especially
|
|
for multithreaded platforms that don't produce usable core
|
|
files, or if a core file would be too large. On some
|
|
platforms, this also causes SIGSEGV to be caught and
|
|
result in an infinite loop in a handler, allowing
|
|
similar debugging techniques.
|
|
|
|
GC_PRINT_STATS - Turn on as much logging as is easily feasible without
|
|
adding signifcant runtime overhead. Doesn't work if
|
|
the collector is built with SMALL_CONFIG. Overridden
|
|
by setting GC_quiet. On by default if the collector
|
|
was built without -DSILENT.
|
|
|
|
GC_PRINT_ADDRESS_MAP - Linux only. Dump /proc/self/maps, i.e. various address
|
|
maps for the process, to stderr on every GC. Useful for
|
|
mapping root addresses to source for deciphering leak
|
|
reports.
|
|
|
|
GC_NPROCS=<n> - Linux w/threads only. Explicitly sets the number of processors
|
|
that the GC should expect to use. Note that setting this to 1
|
|
when multiple processors are available will preserve
|
|
correctness, but may lead to really horrible performance.
|
|
|
|
GC_NO_BLACKLIST_WARNING - Prevents the collector from issuing
|
|
"Needed to allocate blacklisted block at ..." warnings.
|
|
|
|
The following turn on runtime flags that are also program settable. Checked
|
|
only during initialization. We expect that they will usually be set through
|
|
other means, but this may help with debugging and testing:
|
|
|
|
GC_FIND_LEAK - Turns on GC_find_leak and thus leak detection.
|
|
|
|
GC_ALL_INTERIOR_POINTERS - Turns on GC_all_interior_pointers and thus interior
|
|
pointer recognition.
|
|
|
|
GC_DONT_GC - Turns off garbage collection. Use cautiously.
|