Hi, libeio manual says that EIO_STACKSIZE, if set to 0, leaves pthread stack size at its default value:
--quote If it is defined, but 0, then the default operating system stack size will be used. --end quote In fact, if EIO_STACKSIZE is defined, but 0, the stack size used is PTHREAD_STACK_MIN: --quote: x_thread.h pthread_attr_setstacksize (&attr, PTHREAD_STACK_MIN < X_STACKSIZE ? X_STACKSIZE : PTHREAD_STACK_MIN); --end quote (X_STACKSIZE is defined to EIO_STACKSIZE). PTHREAD_STACK_MIN on my system is 16K, whereas the default stack size is 8M. It would be nice if the code is fixed to follow the docs: setstacksize shouldn't be called at all if X_STACKSIZE is 0. On a side note, having read the discussion from a few years ago http://lists.schmorp.de/pipermail/libev/2009q2/000661.html it seems that EIO_STACKSIZE, as a default for all threads is indeed a rather crude solution for the problem, while thread groups, mentioned in the thread, a rather sophisticated, but perhaps unnecessary. It seems that all that is necessary is to ensure that EIO_CUSTOM requests can be handled by threads with a configurable stack size -- this will solve all the known issues with libeio and stack size. PS eio.pod seems to be broken with regard to EIO_STACKSIZE as well, it doesn't mention the name of the constant, only its description: --quote These symbols, if used, must be defined when compiling eio.c. (nada) --end quote Thanks! -- http://tarantool.org - an efficient, extensible in-memory data store _______________________________________________ libev mailing list libev@lists.schmorp.de http://lists.schmorp.de/cgi-bin/mailman/listinfo/libev
