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Annotation of OpenXM_contrib/gc/README.sgi, Revision 1.1

1.1     ! maekawa     1: Performance of the incremental collector can be greatly enhanced with
        !             2: -DNO_EXECUTE_PERMISSION.
        !             3:
        !             4: The collector should run with all of the -32, -n32 and -64 ABIs.  Remember to
        !             5: define the AS macro in the Makefile to be "as -64", or "as -n32".
        !             6:
        !             7: If you use -DREDIRECT_MALLOC=GC_malloc with C++ code, your code should make
        !             8: at least one explicit call to malloc instead of new to ensure that the proper
        !             9: version of malloc is linked in.
        !            10:
        !            11: Sproc threads are not supported in this version, though there may exist other
        !            12: ports.
        !            13:
        !            14: Pthreads support is provided.  This requires that:
        !            15:
        !            16: 1) You compile the collector with -DIRIX_THREADS specified in the Makefile.
        !            17:
        !            18: 2) You have the latest pthreads patches installed.
        !            19:
        !            20: (Though the collector makes only documented pthread calls,
        !            21: it relies on signal/threads interactions working just right in ways
        !            22: that are not required by the standard.  It is unlikely that this code
        !            23: will run on other pthreads platforms.  But please tell me if it does.)
        !            24:
        !            25: 3) Every file that makes thread calls should define IRIX_THREADS and then
        !            26: include gc.h.  Gc.h redefines some of the pthread primitives as macros which
        !            27: also provide the collector with information it requires.
        !            28:
        !            29: 4) pthread_cond_wait and pthread_cond_timed_wait should be prepared for
        !            30: premature wakeups.  (I believe the pthreads and realted standards require this
        !            31: anyway.  Irix pthreads often terminate a wait if a signal arrives.
        !            32: The garbage collector uses signals to stop threads.)
        !            33:
        !            34: 5) It is expensive to stop a thread waiting in IO at the time the request is
        !            35: initiated.  Applications with many such threads may not exhibit acceptable
        !            36: performance with the collector.  (Increasing the heap size may help.)
        !            37:
        !            38: 6) The collector should not be compiled with -DREDIRECT_MALLOC.  This
        !            39: confuses some library calls made by the pthreads implementation, which
        !            40: expect the standard malloc.
        !            41: