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-Performance of the incremental collector can be greatly enhanced with
--DNO_EXECUTE_PERMISSION.
-
-The collector should run with all of the -32, -n32 and -64 ABIs.  Remember to
-define the AS macro in the Makefile to be "as -64", or "as -n32".
-
-If you use -DREDIRECT_MALLOC=GC_malloc with C++ code, your code should make
-at least one explicit call to malloc instead of new to ensure that the proper
-version of malloc is linked in.
-
-Sproc threads are not supported in this version, though there may exist other
-ports.
-
-Pthreads support is provided.  This requires that:
-
-1) You compile the collector with -DGC_IRIX_THREADS specified in the Makefile.
-
-2) You have the latest pthreads patches installed.  
-
-(Though the collector makes only documented pthread calls,
-it relies on signal/threads interactions working just right in ways
-that are not required by the standard.  It is unlikely that this code
-will run on other pthreads platforms.  But please tell me if it does.)
-
-3) Every file that makes thread calls should define IRIX_THREADS and then
-include gc.h.  Gc.h redefines some of the pthread primitives as macros which
-also provide the collector with information it requires.
-
-4) pthread_cond_wait and pthread_cond_timed_wait should be prepared for
-premature wakeups.  (I believe the pthreads and realted standards require this
-anyway.  Irix pthreads often terminate a wait if a signal arrives.
-The garbage collector uses signals to stop threads.)
-
-5) It is expensive to stop a thread waiting in IO at the time the request is
-initiated.  Applications with many such threads may not exhibit acceptable
-performance with the collector.  (Increasing the heap size may help.)
-
-6) The collector should not be compiled with -DREDIRECT_MALLOC.  This
-confuses some library calls made by the pthreads implementation, which
-expect the standard malloc.
-