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I did compile rubinius without llvm on a CenOS 5.4 and create a program to spawn lots of threads.
Whem it reaches a certain number os threads, raises an segmentation fault or in some cases, even before create the threads an error occurs. Some specific information about the problem:
$pool = 
NTHREADS.to_i.times do |n|
++ Running with 730 threads: execution is ok.
++Running with 751 threads: after 17 seconds of execution, the following error raises:
mmap: Cannot allocate memory
++ Running with 752+ threads:
Sometimes it raises the following error just after the execution:
rbx: vm/util/thread.hpp:115: void thread::Thread::run(): Assertion `pthread_create(&native_, &attrs, trampoline, (void*)this) == 0' failed.
Sometimes, after 10-15 seconds of execution, it raises:
You've hit two bugs at once here I think, Evan fixed an issue in the GC in commit defd53a and I've fixed the issue that it should not segfault but throw a ThreadError if it can't create more threads in commit 0bec6e5.
Could you test it again?
No word, assuming fixed.