X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/31f8d2188a6cfd24c58c7503728bc1317be2f073..358b3ac1d1ce9e2cfcc7583271916ebd96eff6da:/src/simix/smx_context.cpp diff --git a/src/simix/smx_context.cpp b/src/simix/smx_context.cpp index 87ea4dce38..712ab9cfaa 100644 --- a/src/simix/smx_context.cpp +++ b/src/simix/smx_context.cpp @@ -1,17 +1,26 @@ /* a fast and simple context switching library */ -/* Copyright (c) 2009-2015. The SimGrid Team. - * All rights reserved. */ +/* Copyright (c) 2009-2017. The SimGrid Team. All rights reserved. */ /* This program is free software; you can redistribute it and/or modify it * under the terms of the license (GNU LGPL) which comes with this package. */ +#include +#include + +#include +#include + +#include +#include +#include +#include + #include "src/internal_config.h" #include "xbt/log.h" #include "xbt/swag.h" #include "xbt/xbt_os_thread.h" #include "smx_private.h" -#include "smx_private.hpp" #include "simgrid/sg_config.h" #include "src/internal_config.h" #include "simgrid/modelchecker.h" @@ -35,7 +44,41 @@ XBT_LOG_NEW_DEFAULT_SUBCATEGORY(simix_context, simix, "Context switching mechanism"); -char* smx_context_factory_name = NULL; /* factory name specified by --cfg=contexts/factory:value */ +static std::pair context_factories[] = { +#if HAVE_RAW_CONTEXTS + { "raw", &simgrid::kernel::context::raw_factory }, +#endif +#if HAVE_UCONTEXT_CONTEXTS + { "ucontext", &simgrid::kernel::context::sysv_factory }, +#endif +#if HAVE_BOOST_CONTEXTS + { "boost", &simgrid::kernel::context::boost_factory }, +#endif +#if HAVE_THREAD_CONTEXTS + { "thread", &simgrid::kernel::context::thread_factory }, +#endif +}; + +static_assert(sizeof(context_factories) != 0, "No context factories are enabled for this build"); + +// Create the list of possible contexts: +static inline +std::string contexts_list() +{ + std::string res; + const std::size_t n = sizeof(context_factories) / sizeof(context_factories[0]); + for (std::size_t i = 1; i != n; ++i) { + res += ", "; + res += context_factories[i].first; + } + return res; +} + +static simgrid::config::Flag context_factory_name( + "contexts/factory", + (std::string("Possible values: ")+contexts_list()).c_str(), + context_factories[0].first); + int smx_context_stack_size; int smx_context_stack_size_was_set = 0; int smx_context_guard_size; @@ -50,73 +93,77 @@ static int smx_parallel_contexts = 1; static int smx_parallel_threshold = 2; static e_xbt_parmap_mode_t smx_parallel_synchronization_mode = XBT_PARMAP_DEFAULT; -/** +/** * This function is called by SIMIX_global_init() to initialize the context module. */ -void SIMIX_context_mod_init(void) +void SIMIX_context_mod_init() { + xbt_assert(simix_global->context_factory == nullptr); + #if HAVE_THREAD_CONTEXTS && !HAVE_THREAD_LOCAL_STORAGE /* the __thread storage class is not available on this platform: * use getspecific/setspecific instead to store the current context in each thread */ xbt_os_thread_key_create(&smx_current_context_key); #endif - if (!simix_global->context_factory) { - /* select the context factory to use to create the contexts */ - if (simgrid::simix::factory_initializer) - simix_global->context_factory = simgrid::simix::factory_initializer(); - else { /* use the factory specified by --cfg=contexts/factory:value */ -#if HAVE_THREAD_CONTEXTS - if (!strcmp(smx_context_factory_name, "thread")) - simix_global->context_factory = simgrid::simix::thread_factory(); -#else - if (0); -#endif -#if HAVE_UCONTEXT_CONTEXTS - else if (!strcmp(smx_context_factory_name, "ucontext")) - simix_global->context_factory = simgrid::simix::sysv_factory(); -#endif -#if HAVE_RAW_CONTEXTS - else if (!strcmp(smx_context_factory_name, "raw")) - simix_global->context_factory = simgrid::simix::raw_factory(); + +#if defined(__APPLE__) || defined(__NetBSD__) + if (context_factory_name == std::string("thread") && + strcmp(xbt_cfg_get_string("smpi/privatization"), "dlopen") == 0) { + XBT_WARN("dlopen+thread broken on Apple and BSD. Switching to raw contexts."); + context_factory_name = "raw"; + } #endif -#if HAVE_BOOST_CONTEXTS - else if (!strcmp(smx_context_factory_name, "boost")) - simix_global->context_factory = simgrid::simix::boost_factory(); +#if defined(__FreeBSD__) + if (context_factory_name == std::string("thread") && strcmp(xbt_cfg_get_string("smpi/privatization"), "no") != 0) { + XBT_WARN("mmap broken on FreeBSD, but dlopen+thread broken too. Switching to dlopen+raw contexts."); + context_factory_name = "raw"; + } #endif - else { - XBT_ERROR("Invalid context factory specified. Valid factories on this machine:"); + + /* select the context factory to use to create the contexts */ + if (simgrid::kernel::context::factory_initializer) { // Give Java a chance to hijack the factory mechanism + simix_global->context_factory = simgrid::kernel::context::factory_initializer(); + return; + } + /* use the factory specified by --cfg=contexts/factory:value */ + for (auto const& factory : context_factories) + if (context_factory_name == factory.first) { + simix_global->context_factory = factory.second(); + break; + } + + if (simix_global->context_factory == nullptr) { + XBT_ERROR("Invalid context factory specified. Valid factories on this machine:"); #if HAVE_RAW_CONTEXTS - XBT_ERROR(" raw: high performance context factory implemented specifically for SimGrid"); + XBT_ERROR(" raw: high performance context factory implemented specifically for SimGrid"); #else - XBT_ERROR(" (raw contexts were disabled at compilation time on this machine -- check configure logs for details)"); + XBT_ERROR(" (raw contexts were disabled at compilation time on this machine -- check configure logs for details)"); #endif #if HAVE_UCONTEXT_CONTEXTS - XBT_ERROR(" ucontext: classical system V contexts (implemented with makecontext, swapcontext and friends)"); + XBT_ERROR(" ucontext: classical system V contexts (implemented with makecontext, swapcontext and friends)"); #else - XBT_ERROR(" (ucontext was disabled at compilation time on this machine -- check configure logs for details)"); + XBT_ERROR(" (ucontext was disabled at compilation time on this machine -- check configure logs for details)"); #endif #if HAVE_BOOST_CONTEXTS - XBT_ERROR(" boost: this uses the boost libraries context implementation"); + XBT_ERROR(" boost: this uses the boost libraries context implementation"); #else - XBT_ERROR(" (boost was disabled at compilation time on this machine -- check configure logs for details. Did you install the libboost-context-dev package?)"); + XBT_ERROR(" (boost was disabled at compilation time on this machine -- check configure logs for details. Did you install the libboost-context-dev package?)"); #endif - XBT_ERROR(" thread: slow portability layer using pthreads as provided by gcc"); - xbt_die("Please use a valid factory."); - } - } + XBT_ERROR(" thread: slow portability layer using pthreads as provided by gcc"); + xbt_die("Please use a valid factory."); } } /** * This function is called by SIMIX_clean() to finalize the context module. */ -void SIMIX_context_mod_exit(void) +void SIMIX_context_mod_exit() { delete simix_global->context_factory; simix_global->context_factory = nullptr; } -void *SIMIX_context_stack_new(void) +void *SIMIX_context_stack_new() { void *stack; @@ -135,8 +182,8 @@ void *SIMIX_context_stack_new(void) #endif size_t size = smx_context_stack_size + smx_context_guard_size; -#if HAVE_MC - /* Cannot use posix_memalign when HAVE_MC. Align stack by hand, and save the +#if SIMGRID_HAVE_MC + /* Cannot use posix_memalign when SIMGRID_HAVE_MC. Align stack by hand, and save the * pointer returned by xbt_malloc0. */ char *alloc = (char*)xbt_malloc0(size + xbt_pagesize); stack = alloc - ((uintptr_t)alloc & (xbt_pagesize - 1)) + xbt_pagesize; @@ -150,9 +197,13 @@ void *SIMIX_context_stack_new(void) #ifndef _WIN32 if (mprotect(stack, smx_context_guard_size, PROT_NONE) == -1) { - xbt_die("Failed to protect stack: %s", strerror(errno)); - /* This is fatal. We are going to fail at some point when - we tryi reusing this. */ + xbt_die( + "Failed to protect stack: %s.\n" + "If you are running a lot of actors, you may be exceeding the amount of mappings allowed per process.\n" + "On Linux systems, change this value with sudo sysctl -w vm.max_map_count=newvalue (default value: 65536)\n" + "Please see http://simgrid.gforge.inria.fr/simgrid/latest/doc/html/options.html#options_virt for more info.", + strerror(errno)); + /* This is fatal. We are going to fail at some point when we try reusing this. */ } #endif stack = (char *)stack + smx_context_guard_size; @@ -186,7 +237,7 @@ void SIMIX_context_stack_delete(void *stack) XBT_WARN("Failed to remove page protection: %s", strerror(errno)); /* try to pursue anyway */ } -#if HAVE_MC +#if SIMGRID_HAVE_MC /* Retrieve the saved pointer. See SIMIX_context_stack_new above. */ stack = *((void **)stack - 1); #endif @@ -197,16 +248,15 @@ void SIMIX_context_stack_delete(void *stack) } /** @brief Returns whether some parallel threads are used for the user contexts. */ -int SIMIX_context_is_parallel(void) { +int SIMIX_context_is_parallel() { return smx_parallel_contexts > 1; } /** - * \brief Returns the number of parallel threads used - * for the user contexts. + * @brief Returns the number of parallel threads used for the user contexts. * \return the number of threads (1 means no parallelism) */ -int SIMIX_context_get_nthreads(void) { +int SIMIX_context_get_nthreads() { return smx_parallel_contexts; } @@ -240,7 +290,7 @@ void SIMIX_context_set_nthreads(int nb_threads) { * \return when the number of user processes ready to run is above * this threshold, they are run in parallel */ -int SIMIX_context_get_parallel_threshold(void) { +int SIMIX_context_get_parallel_threshold() { return smx_parallel_threshold; } @@ -262,7 +312,7 @@ void SIMIX_context_set_parallel_threshold(int threshold) { * parallel. * \return how threads are synchronized if processes are run in parallel */ -e_xbt_parmap_mode_t SIMIX_context_get_parallel_mode(void) { +e_xbt_parmap_mode_t SIMIX_context_get_parallel_mode() { return smx_parallel_synchronization_mode; } @@ -279,7 +329,7 @@ void SIMIX_context_set_parallel_mode(e_xbt_parmap_mode_t mode) { * \brief Returns the current context of this thread. * \return the current context of this thread */ -smx_context_t SIMIX_context_get_current(void) +smx_context_t SIMIX_context_get_current() { if (SIMIX_context_is_parallel()) { #if HAVE_THREAD_LOCAL_STORAGE