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