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openmpi/opal/runtime/opal_cr.c

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/*
* Copyright (c) 2004-2010 The Trustees of Indiana University and Indiana
* University Research and Technology
* Corporation. All rights reserved.
* Copyright (c) 2004-2012 The University of Tennessee and The University
* of Tennessee Research Foundation. All rights
* reserved.
* Copyright (c) 2004-2005 High Performance Computing Center Stuttgart,
* University of Stuttgart. All rights reserved.
* Copyright (c) 2004-2005 The Regents of the University of California.
* All rights reserved.
* Copyright (c) 2007-2017 Los Alamos National Security, LLC. All rights
* reserved.
* Copyright (c) 2011 Oak Ridge National Labs. All rights reserved.
* Copyright (c) 2012-2013 Cisco Systems, Inc. All rights reserved.
* Copyright (c) 2015 Research Organization for Information Science
* and Technology (RIST). All rights reserved.
* Copyright (c) 2017 IBM Corporation. All rights reserved.
* $COPYRIGHT$
*
* Additional copyrights may follow
*
* $HEADER$
*/
/** @file
*
* OPAL Layer Checkpoint/Restart Runtime functions
*
*/
#include "opal_config.h"
#include <string.h>
#include <errno.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif /* HAVE_UNISTD_H */
#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#endif /* HAVE_FCNTL_H */
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif /* HAVE_SYS_TYPES_H */
#ifdef HAVE_SYS_STAT_H
#include <sys/stat.h> /* for mkfifo */
#endif /* HAVE_SYS_STAT_H */
#include <signal.h>
#include "opal/class/opal_object.h"
#include "opal/util/opal_environ.h"
#include "opal/util/show_help.h"
#include "opal/util/output.h"
#include "opal/util/malloc.h"
#include "opal/util/keyval_parse.h"
#include "opal/util/opal_environ.h"
#include "opal/util/argv.h"
#include "opal/memoryhooks/memory.h"
#include "opal/mca/base/base.h"
#include "opal/runtime/opal_cr.h"
#include "opal/runtime/opal.h"
#include "opal/constants.h"
#include "opal/mca/if/base/base.h"
#include "opal/mca/memcpy/base/base.h"
#include "opal/mca/memory/base/base.h"
#include "opal/mca/timer/base/base.h"
#include "opal/threads/mutex.h"
#include "opal/threads/threads.h"
#include "opal/mca/crs/base/base.h"
/******************
* Global Var Decls
******************/
#if OPAL_ENABLE_CRDEBUG == 1
static opal_thread_t **opal_cr_debug_free_threads = NULL;
static int opal_cr_debug_num_free_threads = 0;
static int opal_cr_debug_threads_already_waiting = false;
int MPIR_debug_with_checkpoint = 0;
static volatile int MPIR_checkpoint_debug_gate = 0;
int opal_cr_debug_signal = 0;
#endif
bool opal_cr_stall_check = false;
bool opal_cr_currently_stalled = false;
int opal_cr_output = -1;
int opal_cr_verbose = 0;
int opal_cr_initalized = 0;
static double opal_cr_get_time(void);
static void display_indv_timer_core(double diff, char *str);
static double timer_start[OPAL_CR_TIMER_MAX];
bool opal_cr_timing_barrier_enabled = false;
bool opal_cr_timing_enabled = false;
int opal_cr_timing_my_rank = 0;
int opal_cr_timing_target_rank = 0;
/******************
* Local Functions & Var Decls
******************/
static int extract_env_vars(int prev_pid, char * file_name);
static void opal_cr_sigpipe_debug_signal_handler (int signo);
static opal_cr_user_inc_callback_fn_t cur_user_coord_callback[OPAL_CR_INC_MAX] = {NULL};
static opal_cr_coord_callback_fn_t cur_coord_callback = NULL;
static opal_cr_notify_callback_fn_t cur_notify_callback = NULL;
static int core_prev_pid = 0;
/******************
* Interface Functions & Vars
******************/
char * opal_cr_pipe_dir = NULL;
int opal_cr_entry_point_signal = 0;
bool opal_cr_is_enabled = true;
bool opal_cr_is_tool = false;
/* Current checkpoint state */
int opal_cr_checkpointing_state = OPAL_CR_STATUS_NONE;
/* Current checkpoint request channel state */
int opal_cr_checkpoint_request = OPAL_CR_STATUS_NONE;
static bool opal_cr_debug_sigpipe = false;
bool opal_cr_continue_like_restart = false;
#if OPAL_ENABLE_FT_THREAD == 1
/*****************
* Threading Functions and Variables
*****************/
static void* opal_cr_thread_fn(opal_object_t *obj);
bool opal_cr_thread_is_done = false;
bool opal_cr_thread_is_active = false;
bool opal_cr_thread_in_library = false;
bool opal_cr_thread_use_if_avail = true;
int32_t opal_cr_thread_num_in_library = 0;
int opal_cr_thread_sleep_check = 0;
int opal_cr_thread_sleep_wait = 0;
opal_thread_t opal_cr_thread;
opal_mutex_t opal_cr_thread_lock;
#if 0
#define OPAL_CR_LOCK() opal_cr_thread_in_library = true; opal_mutex_lock(&opal_cr_thread_lock);
#define OPAL_CR_UNLOCK() opal_cr_thread_in_library = false; opal_mutex_unlock(&opal_cr_thread_lock);
#define OPAL_CR_THREAD_LOCK() opal_mutex_lock(&opal_cr_thread_lock);
#define OPAL_CR_THREAD_UNLOCK() opal_mutex_unlock(&opal_cr_thread_lock);
#else
/* This technique will potentially starve the thread, but that is OK since
* it is only there as support for when the process is not in the MPI library
*/
static const uint32_t ThreadFlag = 0x1;
static const uint32_t ProcInc = 0x2;
#define OPAL_CR_LOCK() \
{ \
opal_cr_thread_in_library = true; \
OPAL_THREAD_ADD_FETCH32(&opal_cr_thread_num_in_library, ProcInc); \
while( (opal_cr_thread_num_in_library & ThreadFlag ) != 0 ) { \
sched_yield(); \
} \
}
#define OPAL_CR_UNLOCK() \
{ \
OPAL_THREAD_ADD_FETCH32(&opal_cr_thread_num_in_library, -ProcInc); \
if( opal_cr_thread_num_in_library <= 0 ) { \
opal_cr_thread_in_library = false; \
} \
}
#define OPAL_CR_THREAD_LOCK() \
{ \
int32_t _tmp_value = 0; \
while(!OPAL_ATOMIC_COMPARE_EXCHANGE_STRONG_32 (&opal_cr_thread_num_in_library, &_tmp_value, ThreadFlag)) { \
if( !opal_cr_thread_is_active && opal_cr_thread_is_done) { \
break; \
} \
sched_yield(); \
usleep(opal_cr_thread_sleep_check); \
} \
}
#define OPAL_CR_THREAD_UNLOCK() \
{ \
OPAL_THREAD_ADD_FETCH32(&opal_cr_thread_num_in_library, -ThreadFlag); \
}
#endif
#endif /* OPAL_ENABLE_FT_THREAD == 1 */
int opal_cr_set_enabled(bool en)
{
opal_cr_is_enabled = en;
return OPAL_SUCCESS;
}
static int opal_cr_register (void)
{
int ret;
#if OPAL_ENABLE_CRDEBUG == 1
int t;
#endif
/*
* Some startup MCA parameters
*/
ret = mca_base_var_register ("opal", "opal", "cr", "verbose",
"Verbose output level for the runtime OPAL Checkpoint/Restart functionality",
MCA_BASE_VAR_TYPE_INT, NULL, 0, MCA_BASE_VAR_FLAG_SETTABLE,
OPAL_INFO_LVL_8, MCA_BASE_VAR_SCOPE_LOCAL,
&opal_cr_verbose);
if (0 > ret) {
return ret;
}
opal_cr_is_enabled = false;
(void) mca_base_var_register("opal", "ft", "cr", "enabled",
"Enable fault tolerance for this program",
MCA_BASE_VAR_TYPE_BOOL, NULL, 0, MCA_BASE_VAR_FLAG_SETTABLE,
OPAL_INFO_LVL_8, MCA_BASE_VAR_SCOPE_ALL_EQ,
&opal_cr_is_enabled);
opal_cr_timing_enabled = false;
(void) mca_base_var_register ("opal", "opal", "cr", "enable_timer",
"Enable Checkpoint timer (Default: Disabled)",
MCA_BASE_VAR_TYPE_BOOL, NULL, 0, MCA_BASE_VAR_FLAG_SETTABLE,
OPAL_INFO_LVL_8, MCA_BASE_VAR_SCOPE_ALL_EQ,
&opal_cr_timing_enabled);
opal_cr_timing_barrier_enabled = false;
(void) mca_base_var_register ("opal", "opal", "cr", "enable_timer_barrier",
"Enable Checkpoint timer Barrier. Must have opal_cr_enable_timer set. (Default: Disabled)",
MCA_BASE_VAR_TYPE_BOOL, NULL, 0, opal_cr_timing_enabled ? MCA_BASE_VAR_FLAG_SETTABLE : 0,
OPAL_INFO_LVL_8, MCA_BASE_VAR_SCOPE_ALL_EQ,
&opal_cr_timing_barrier_enabled);
opal_cr_timing_barrier_enabled = opal_cr_timing_barrier_enabled && opal_cr_timing_enabled;
(void) mca_base_var_register ("opal", "opal", "cr", "timer_target_rank",
"Target Rank for the timer (Default: 0)",
MCA_BASE_VAR_TYPE_INT, NULL, 0, MCA_BASE_VAR_FLAG_SETTABLE,
OPAL_INFO_LVL_8, MCA_BASE_VAR_SCOPE_ALL_EQ,
&opal_cr_timing_target_rank);
#if OPAL_ENABLE_FT_THREAD == 1
opal_cr_thread_use_if_avail = false;
(void) mca_base_var_register ("opal", "opal", "cr", "use_thread",
"Use an async thread to checkpoint this program (Default: Disabled)",
MCA_BASE_VAR_TYPE_BOOL, NULL, 0, MCA_BASE_VAR_FLAG_SETTABLE,
OPAL_INFO_LVL_8, MCA_BASE_VAR_SCOPE_ALL_EQ,
&opal_cr_thread_use_if_avail);
opal_cr_thread_sleep_check = 0;
(void) mca_base_var_register ("opal", "opal", "cr", "thread_sleep_check",
"Time to sleep between checking for a checkpoint (Default: 0)",
MCA_BASE_VAR_TYPE_INT, NULL, 0, MCA_BASE_VAR_FLAG_SETTABLE,
OPAL_INFO_LVL_8, MCA_BASE_VAR_SCOPE_ALL_EQ,
&opal_cr_thread_sleep_check);
opal_cr_thread_sleep_wait = 100;
(void) mca_base_var_register ("opal", "opal", "cr", "thread_sleep_wait",
"Time to sleep waiting for process to exit MPI library (Default: 1000)",
MCA_BASE_VAR_TYPE_INT, NULL, 0, MCA_BASE_VAR_FLAG_SETTABLE,
OPAL_INFO_LVL_8, MCA_BASE_VAR_SCOPE_ALL_EQ,
&opal_cr_thread_sleep_wait);
#endif
opal_cr_is_tool = false;
(void) mca_base_var_register ("opal", "opal", "cr", "is_tool",
"Is this a tool program, meaning does it require a fully operational OPAL or just enough to exec.",
MCA_BASE_VAR_TYPE_BOOL, NULL, 0, MCA_BASE_VAR_FLAG_SETTABLE,
OPAL_INFO_LVL_8, MCA_BASE_VAR_SCOPE_ALL_EQ,
&opal_cr_is_tool);
#ifndef __WINDOWS__
opal_cr_entry_point_signal = SIGUSR1;
(void) mca_base_var_register ("opal", "opal", "cr", "signal",
"Checkpoint/Restart signal used to initialize an OPAL Only checkpoint of a program",
MCA_BASE_VAR_TYPE_INT, NULL, 0, MCA_BASE_VAR_FLAG_SETTABLE,
OPAL_INFO_LVL_8, MCA_BASE_VAR_SCOPE_ALL_EQ,
&opal_cr_entry_point_signal);
opal_cr_debug_sigpipe = false;
(void) mca_base_var_register ("opal", "opal", "cr", "debug_sigpipe",
"Activate a signal handler for debugging SIGPIPE Errors that can happen on restart. (Default: Disabled)",
MCA_BASE_VAR_TYPE_BOOL, NULL, 0, MCA_BASE_VAR_FLAG_SETTABLE,
OPAL_INFO_LVL_8, MCA_BASE_VAR_SCOPE_ALL_EQ,
&opal_cr_debug_sigpipe);
#else
opal_cr_is_tool = true; /* no support for CR on Windows yet */
#endif /* __WINDOWS__ */
#if OPAL_ENABLE_CRDEBUG == 1
MPIR_debug_with_checkpoint = 0;
(void) mca_base_var_register ("opal", "opal", "cr", "enable_crdebug",
"Enable checkpoint/restart debugging",
MCA_BASE_VAR_TYPE_INT, NULL, 0, MCA_BASE_VAR_FLAG_SETTABLE,
OPAL_INFO_LVL_8, MCA_BASE_VAR_SCOPE_ALL_EQ,
&MPIR_debug_with_checkpoint);
opal_cr_debug_num_free_threads = 3;
opal_cr_debug_free_threads = (opal_thread_t **)malloc(sizeof(opal_thread_t *) * opal_cr_debug_num_free_threads );
for(t = 0; t < opal_cr_debug_num_free_threads; ++t ) {
opal_cr_debug_free_threads[t] = NULL;
}
opal_cr_debug_signal = SIGTSTP;
(void) mca_base_var_register ("opal", "opal", "cr", "crdebug_signal",
"Checkpoint/Restart signal used to hold threads when debugging",
MCA_BASE_VAR_TYPE_INT, NULL, 0, MCA_BASE_VAR_FLAG_SETTABLE,
OPAL_INFO_LVL_8, MCA_BASE_VAR_SCOPE_ALL_EQ,
&opal_cr_debug_signal);
#endif
opal_cr_pipe_dir = (char *) opal_tmp_directory();
(void) mca_base_var_register ("opal", "opal", "cr", "tmp_dir",
"Temporary directory to place rendezvous files for a checkpoint",
MCA_BASE_VAR_TYPE_STRING, NULL, 0, MCA_BASE_VAR_FLAG_SETTABLE,
OPAL_INFO_LVL_8, MCA_BASE_VAR_SCOPE_ALL_EQ,
&opal_cr_pipe_dir);
return OPAL_SUCCESS;
}
int opal_cr_init(void )
{
int ret, exit_status = OPAL_SUCCESS;
opal_cr_coord_callback_fn_t prev_coord_func;
if( ++opal_cr_initalized != 1 ) {
if( opal_cr_initalized < 1 ) {
exit_status = OPAL_ERROR;
goto cleanup;
}
exit_status = OPAL_SUCCESS;
goto cleanup;
}
ret = opal_cr_register ();
if (OPAL_SUCCESS != ret) {
return ret;
}
if(0 != opal_cr_verbose) {
opal_cr_output = opal_output_open(NULL);
opal_output_set_verbosity(opal_cr_output, opal_cr_verbose);
}
opal_output_verbose(10, opal_cr_output,
"opal_cr: init: Verbose Level: %d",
opal_cr_verbose);
opal_output_verbose(10, opal_cr_output,
"opal_cr: init: FT Enabled: %s",
opal_cr_is_enabled ? "true" : "false");
opal_output_verbose(10, opal_cr_output,
"opal_cr: init: Is a tool program: %s",
opal_cr_is_tool ? "true" : "false");
opal_output_verbose(10, opal_cr_output,
"opal_cr: init: Debug SIGPIPE: %d (%s)",
opal_cr_verbose, (opal_cr_debug_sigpipe ? "True" : "False"));
opal_output_verbose(10, opal_cr_output,
"opal_cr: init: Checkpoint Signal: %d",
opal_cr_entry_point_signal);
#if OPAL_ENABLE_FT_THREAD == 1
opal_output_verbose(10, opal_cr_output,
"opal_cr: init: FT Use thread: %s",
opal_cr_thread_use_if_avail ? "true" : "false");
opal_output_verbose(10, opal_cr_output,
"opal_cr: init: FT thread sleep: check = %d, wait = %d",
opal_cr_thread_sleep_check, opal_cr_thread_sleep_wait);
/* If we have a thread, then attach the SIGPIPE signal handler there since
* it is most likely to be the one that needs it.
*/
if( opal_cr_debug_sigpipe && !opal_cr_thread_use_if_avail ) {
if( SIG_ERR == signal(SIGPIPE, opal_cr_sigpipe_debug_signal_handler) ) {
;
}
}
#else
if( opal_cr_debug_sigpipe ) {
if( SIG_ERR == signal(SIGPIPE, opal_cr_sigpipe_debug_signal_handler) ) {
;
}
}
#endif
#if OPAL_ENABLE_CRDEBUG == 1
opal_output_verbose(10, opal_cr_output,
"opal_cr: init: C/R Debugging Enabled [%s]\n",
(MPIR_debug_with_checkpoint ? "True": "False"));
opal_output_verbose(10, opal_cr_output,
"opal_cr: init: Checkpoint Signal (Debug): %d",
opal_cr_debug_signal);
if( SIG_ERR == signal(opal_cr_debug_signal, MPIR_checkpoint_debugger_signal_handler) ) {
opal_output(opal_cr_output,
"opal_cr: init: Failed to register C/R debug signal (%d)",
opal_cr_debug_signal);
}
#endif
opal_output_verbose(10, opal_cr_output,
"opal_cr: init: Temp Directory: %s",
opal_cr_pipe_dir);
if( !opal_cr_is_tool ) {
/* Register the OPAL interlevel coordination callback */
opal_cr_reg_coord_callback(opal_cr_coord, &prev_coord_func);
opal_cr_stall_check = false;
opal_cr_currently_stalled = false;
} /* End opal_cr_is_tool = true */
/*
* If fault tolerance was not compiled in then
* we need to make sure that the listener thread is active to tell
* the tools that this is not a checkpointable job.
* We don't need the CRS framework to be initalized.
*/
#if OPAL_ENABLE_FT_CR == 1
/*
* Open the checkpoint / restart service components
*/
if (OPAL_SUCCESS != (ret = mca_base_framework_open(&opal_crs_base_framework, 0))) {
opal_show_help( "help-opal-runtime.txt",
"opal_cr_init:no-crs", true,
"opal_crs_base_open", ret );
exit_status = ret;
goto cleanup;
}
if (OPAL_SUCCESS != (ret = opal_crs_base_select())) {
opal_show_help( "help-opal-runtime.txt",
"opal_cr_init:no-crs", true,
"opal_crs_base_select", ret );
exit_status = ret;
goto cleanup;
}
#endif
#if OPAL_ENABLE_FT_THREAD == 1
if( !opal_cr_is_tool && opal_cr_thread_use_if_avail) {
opal_output_verbose(10, opal_cr_output,
"opal_cr: init: starting the thread\n");
/* JJH: We really do need this line below since it enables
* actual locks for threads. However currently the
* upper layers will deadlock if it is enabled.
* So hack around the problem for now, while working
* on a complete solution. See ticket #2741 for more
* details.
* opal_set_using_threads(true);
*/
/*
* Start the thread
*/
OBJ_CONSTRUCT(&opal_cr_thread, opal_thread_t);
OBJ_CONSTRUCT(&opal_cr_thread_lock, opal_mutex_t);
opal_cr_thread_is_done = false;
opal_cr_thread_is_active = false;
opal_cr_thread_in_library = false;
opal_cr_thread_num_in_library = 0;
opal_cr_thread.t_run = opal_cr_thread_fn;
opal_cr_thread.t_arg = NULL;
opal_thread_start(&opal_cr_thread);
} /* End opal_cr_is_tool = true */
else {
opal_output_verbose(10, opal_cr_output,
"opal_cr: init: *Not* Using C/R thread\n");
}
#endif /* OPAL_ENABLE_FT_THREAD == 1 */
cleanup:
return exit_status;
}
int opal_cr_finalize(void)
{
int exit_status = OPAL_SUCCESS;
if( --opal_cr_initalized != 0 ) {
if( opal_cr_initalized < 0 ) {
return OPAL_ERROR;
}
return OPAL_SUCCESS;
}
if( !opal_cr_is_tool ) {
#if OPAL_ENABLE_FT_THREAD == 1
if( opal_cr_thread_use_if_avail ) {
void *data;
/*
* Stop the thread
*/
opal_cr_thread_is_done = true;
opal_cr_thread_is_active = false;
opal_cr_thread_in_library = true;
opal_thread_join(&opal_cr_thread, &data);
OBJ_DESTRUCT(&opal_cr_thread);
OBJ_DESTRUCT(&opal_cr_thread_lock);
}
#endif /* OPAL_ENABLE_FT_THREAD == 1 */
/* Nothing to do for just process notifications */
opal_cr_checkpointing_state = OPAL_CR_STATUS_TERM;
opal_cr_checkpoint_request = OPAL_CR_STATUS_TERM;
}
#if OPAL_ENABLE_CRDEBUG == 1
if( NULL != opal_cr_debug_free_threads ) {
free( opal_cr_debug_free_threads );
opal_cr_debug_free_threads = NULL;
}
opal_cr_debug_num_free_threads = 0;
#endif
if (NULL != opal_cr_pipe_dir) {
free(opal_cr_pipe_dir);
opal_cr_pipe_dir = NULL;
}
#if OPAL_ENABLE_FT_CR == 1
/*
* Close the checkpoint / restart service components
*/
(void) mca_base_framework_close(&opal_crs_base_framework);
#endif
return exit_status;
}
/*
* Check if a checkpoint request needs to be operated upon
*/
void opal_cr_test_if_checkpoint_ready(void)
{
int ret;
if( opal_cr_currently_stalled) {
opal_output_verbose(20, opal_cr_output,
"opal_cr:opal_test_if_ready: JUMPING to Post Stall stage");
goto STAGE_1;
}
/*
* If there is no checkpoint request to act on
* then just return
*/
if(OPAL_CR_STATUS_REQUESTED != opal_cr_checkpoint_request ) {
return;
}
/*
* If we are currently checkpointing:
* - If a request is pending then cancel it
* - o.w., skip it.
*/
if(OPAL_CR_STATUS_RUNNING == opal_cr_checkpointing_state ) {
if( OPAL_SUCCESS != (ret = cur_notify_callback(OPAL_CHECKPOINT_CMD_IN_PROGRESS) ) ) {
opal_output(opal_cr_output,
"Error: opal_cr: test_if_checkpoint_ready: Respond [In Progress] Failed. (%d)",
ret);
}
opal_cr_checkpoint_request = OPAL_CR_STATUS_NONE;
return;
}
/*
* If no CRS module is loaded return an error
*/
if (NULL == opal_crs.crs_checkpoint ) {
if( OPAL_SUCCESS != (ret = cur_notify_callback(OPAL_CHECKPOINT_CMD_NULL) ) ) {
opal_output(opal_cr_output,
"Error: opal_cr: test_if_checkpoint_ready: Respond [Not Able/NULL] Failed. (%d)",
ret);
}
opal_cr_checkpoint_request = OPAL_CR_STATUS_NONE;
return;
}
/*
* Start the checkpoint
*/
opal_cr_checkpointing_state = OPAL_CR_STATUS_RUNNING;
opal_cr_checkpoint_request = OPAL_CR_STATUS_NONE;
STAGE_1:
if( OPAL_SUCCESS != (ret = cur_notify_callback(OPAL_CHECKPOINT_CMD_START) ) ) {
opal_output(opal_cr_output,
"Error: opal_cr: test_if_checkpoint_ready: Respond [Start Ckpt] Failed. (%d)",
ret);
}
return;
}
/*******************************
* Notification Routines
*******************************/
int opal_cr_inc_core_prep(void)
{
int ret;
/*
* Call User Level INC
*/
if(OPAL_SUCCESS != (ret = ompi_trigger_user_inc_callback(OPAL_CR_INC_PRE_CRS_PRE_MPI,
OPAL_CR_INC_STATE_PREPARE)) ) {
return ret;
}
/*
* Use the registered coordination routine
*/
if(OPAL_SUCCESS != (ret = cur_coord_callback(OPAL_CRS_CHECKPOINT)) ) {
if ( OPAL_EXISTS != ret ) {
opal_output(opal_cr_output,
"opal_cr: inc_core: Error: cur_coord_callback(%d) failed! %d\n",
OPAL_CRS_CHECKPOINT, ret);
}
return ret;
}
/*
* Call User Level INC
*/
if(OPAL_SUCCESS != (ret = ompi_trigger_user_inc_callback(OPAL_CR_INC_PRE_CRS_POST_MPI,
OPAL_CR_INC_STATE_PREPARE)) ) {
return ret;
}
core_prev_pid = getpid();
return OPAL_SUCCESS;
}
int opal_cr_inc_core_ckpt(pid_t pid,
opal_crs_base_snapshot_t *snapshot,
opal_crs_base_ckpt_options_t *options,
int *state)
{
int ret, exit_status = OPAL_SUCCESS;
OPAL_CR_SET_TIMER(OPAL_CR_TIMER_CORE0);
if(OPAL_SUCCESS != (ret = opal_crs.crs_checkpoint(pid,
snapshot,
options,
(opal_crs_state_type_t *)state))) {
opal_output(opal_cr_output,
"opal_cr: inc_core: Error: The checkpoint failed. %d\n", ret);
exit_status = ret;
}
if(*state == OPAL_CRS_CONTINUE) {
OPAL_CR_SET_TIMER(OPAL_CR_TIMER_CORE1);
if(options->term) {
*state = OPAL_CRS_TERM;
opal_cr_checkpointing_state = OPAL_CR_STATUS_TERM;
} else {
opal_cr_checkpointing_state = OPAL_CR_STATUS_CONTINUE;
}
}
else {
options->term = false;
}
/*
* If restarting read environment stuff that opal-restart left us.
*/
if(*state == OPAL_CRS_RESTART) {
opal_cr_refresh_environ(core_prev_pid);
opal_cr_checkpointing_state = OPAL_CR_STATUS_RESTART_PRE;
}
return exit_status;
}
int opal_cr_inc_core_recover(int state)
{
int ret;
opal_cr_user_inc_callback_state_t cb_state;
if( opal_cr_checkpointing_state != OPAL_CR_STATUS_TERM &&
opal_cr_checkpointing_state != OPAL_CR_STATUS_CONTINUE &&
opal_cr_checkpointing_state != OPAL_CR_STATUS_RESTART_PRE &&
opal_cr_checkpointing_state != OPAL_CR_STATUS_RESTART_POST ) {
if(state == OPAL_CRS_CONTINUE) {
OPAL_CR_SET_TIMER(OPAL_CR_TIMER_CORE1);
opal_cr_checkpointing_state = OPAL_CR_STATUS_CONTINUE;
}
/*
* If restarting read environment stuff that opal-restart left us.
*/
else if(state == OPAL_CRS_RESTART) {
opal_cr_refresh_environ(core_prev_pid);
opal_cr_checkpointing_state = OPAL_CR_STATUS_RESTART_PRE;
}
}
/*
* Call User Level INC
*/
if( OPAL_CRS_CONTINUE == state ) {
cb_state = OPAL_CR_INC_STATE_CONTINUE;
}
else if( OPAL_CRS_RESTART == state ) {
cb_state = OPAL_CR_INC_STATE_RESTART;
}
else {
cb_state = OPAL_CR_INC_STATE_ERROR;
}
if(OPAL_SUCCESS != (ret = ompi_trigger_user_inc_callback(OPAL_CR_INC_POST_CRS_PRE_MPI,
cb_state)) ) {
return ret;
}
/*
* Use the registered coordination routine
*/
if(OPAL_SUCCESS != (ret = cur_coord_callback(state)) ) {
if ( OPAL_EXISTS != ret ) {
opal_output(opal_cr_output,
"opal_cr: inc_core: Error: cur_coord_callback(%d) failed! %d\n",
state, ret);
}
return ret;
}
if(OPAL_SUCCESS != (ret = ompi_trigger_user_inc_callback(OPAL_CR_INC_POST_CRS_POST_MPI,
cb_state)) ) {
return ret;
}
#if OPAL_ENABLE_CRDEBUG == 1
opal_cr_debug_clear_current_ckpt_thread();
#endif
return OPAL_SUCCESS;
}
int opal_cr_inc_core(pid_t pid,
opal_crs_base_snapshot_t *snapshot,
opal_crs_base_ckpt_options_t *options,
int *state)
{
int ret, exit_status = OPAL_SUCCESS;
/*
* INC: Prepare stack using the registered coordination routine
*/
if(OPAL_SUCCESS != (ret = opal_cr_inc_core_prep() ) ) {
return ret;
}
/*
* INC: Take the checkpoint
*/
if(OPAL_SUCCESS != (ret = opal_cr_inc_core_ckpt(pid, snapshot, options, state) ) ) {
exit_status = ret;
/* Don't return here since we want to restart the OPAL level stuff */
}
/*
* INC: Recover stack using the registered coordination routine
*/
if(OPAL_SUCCESS != (ret = opal_cr_inc_core_recover(*state) ) ) {
return ret;
}
return exit_status;
}
/*******************************
* Coordination Routines
*******************************/
/**
* Current Coordination callback routines
*/
int opal_cr_coord(int state)
{
if(OPAL_CRS_CHECKPOINT == state) {
/* Do Checkpoint Phase work */
}
else if (OPAL_CRS_CONTINUE == state ) {
/* Do Continue Phase work */
}
else if (OPAL_CRS_RESTART == state ) {
/* Do Restart Phase work */
/*
* Re-initialize the event engine
* Otherwise it may/will use stale file descriptors which will disrupt
* the intended users of the soon-to-be newly assigned file descriptors.
*/
opal_event_reinit(opal_sync_event_base);
/*
* Flush if() functionality, since it caches system specific info.
*/
(void) mca_base_framework_close(&opal_if_base_framework);
/* Since opal_ifinit() is not exposed, the necessary
* functions will call it when needed. Just make sure we
* finalized this code so we don't get old socket addrs.
*/
opal_output_reopen_all();
}
else if (OPAL_CRS_TERM == state ) {
/* Do Continue Phase work in prep to terminate the application */
}
else {
/* We must have been in an error state from the checkpoint
* recreate everything, as in the Continue Phase
*/
}
/*
* Here we are returning to either:
* - [orte | ompi]_notify()
*/
opal_cr_checkpointing_state = OPAL_CR_STATUS_RESTART_POST;
return OPAL_SUCCESS;
}
int opal_cr_reg_notify_callback(opal_cr_notify_callback_fn_t new_func,
opal_cr_notify_callback_fn_t *prev_func)
{
/*
* Preserve the previous callback
*/
if( NULL != cur_notify_callback) {
*prev_func = cur_notify_callback;
}
else {
*prev_func = NULL;
}
/*
* Update the callbacks
*/
cur_notify_callback = new_func;
return OPAL_SUCCESS;
}
int opal_cr_user_inc_register_callback(opal_cr_user_inc_callback_event_t event,
opal_cr_user_inc_callback_fn_t function,
opal_cr_user_inc_callback_fn_t *prev_function)
{
if (event >= OPAL_CR_INC_MAX) {
return OPAL_ERROR;
}
if( NULL != cur_user_coord_callback[event] ) {
*prev_function = cur_user_coord_callback[event];
} else {
*prev_function = NULL;
}
cur_user_coord_callback[event] = function;
return OPAL_SUCCESS;
}
int ompi_trigger_user_inc_callback(opal_cr_user_inc_callback_event_t event,
opal_cr_user_inc_callback_state_t state)
{
if( NULL == cur_user_coord_callback[event] ) {
return OPAL_SUCCESS;
}
if (event >= OPAL_CR_INC_MAX) {
return OPAL_ERROR;
}
return ((cur_user_coord_callback[event])(event, state));
}
int opal_cr_reg_coord_callback(opal_cr_coord_callback_fn_t new_func,
opal_cr_coord_callback_fn_t *prev_func)
{
/*
* Preserve the previous callback
*/
if( NULL != cur_coord_callback) {
*prev_func = cur_coord_callback;
}
else {
*prev_func = NULL;
}
/*
* Update the callbacks
*/
cur_coord_callback = new_func;
return OPAL_SUCCESS;
}
int opal_cr_refresh_environ(int prev_pid) {
char *file_name;
#if OPAL_ENABLE_CRDEBUG == 1
char *tmp;
#endif
struct stat file_status;
if( 0 >= prev_pid ) {
prev_pid = getpid();
}
/*
* Make sure the file exists. If it doesn't then this means 2 things:
* 1) We have already executed this function, and
* 2) The file has been deleted on the previous round.
*/
asprintf(&file_name, "%s/%s-%d", opal_tmp_directory(), OPAL_CR_BASE_ENV_NAME, prev_pid);
if (NULL == file_name) {
return OPAL_ERR_OUT_OF_RESOURCE;
}
if(0 != stat(file_name, &file_status) ){
free(file_name);
return OPAL_SUCCESS;
}
#if OPAL_ENABLE_CRDEBUG == 1
mca_base_var_env_name ("opal_cr_enable_crdebug", &tmp);
opal_unsetenv(tmp, &environ);
free (tmp);
#endif
extract_env_vars(prev_pid, file_name);
#if OPAL_ENABLE_CRDEBUG == 1
MPIR_debug_with_checkpoint = 0;
(void) mca_base_var_register ("opal", "opal", "cr", "enable_crdebug",
"Enable checkpoint/restart debugging",
MCA_BASE_VAR_TYPE_INT, NULL, 0, MCA_BASE_VAR_FLAG_SETTABLE,
OPAL_INFO_LVL_8, MCA_BASE_VAR_SCOPE_ALL_EQ,
&MPIR_debug_with_checkpoint);
opal_output_verbose(10, opal_cr_output,
"opal_cr: init: C/R Debugging Enabled [%s] (refresh)\n",
(MPIR_debug_with_checkpoint ? "True": "False"));
#endif
free(file_name);
return OPAL_SUCCESS;
}
/*
* Extract environment variables from a saved file
* and place them in the environment.
*/
static int extract_env_vars(int prev_pid, char * file_name)
{
int exit_status = OPAL_SUCCESS;
FILE *env_data = NULL;
int len = OPAL_PATH_MAX;
char * tmp_str = NULL;
if( 0 >= prev_pid ) {
opal_output(opal_cr_output,
"opal_cr: extract_env_vars: Invalid PID (%d)\n",
prev_pid);
exit_status = OPAL_ERROR;
goto cleanup;
}
if (NULL == (env_data = fopen(file_name, "r")) ) {
exit_status = OPAL_ERROR;
goto cleanup;
}
tmp_str = (char *) malloc(sizeof(char) * OPAL_PATH_MAX);
if( NULL == tmp_str) {
exit_status = OPAL_ERR_OUT_OF_RESOURCE;
goto cleanup;
}
/* Extract an env var */
while(!feof(env_data) ) {
char **t_set = NULL;
if( NULL == fgets(tmp_str, OPAL_PATH_MAX, env_data) ) {
exit_status = OPAL_ERROR;
goto cleanup;
}
len = strlen(tmp_str);
if(tmp_str[len - 1] == '\n') {
tmp_str[len - 1] = '\0';
} else {
opal_output(opal_cr_output,
"opal_cr: extract_env_vars: Error: Parameter too long (%s)\n",
tmp_str);
continue;
}
if( NULL == (t_set = opal_argv_split(tmp_str, '=')) ) {
break;
}
opal_setenv(t_set[0], t_set[1], true, &environ);
opal_argv_free(t_set);
}
cleanup:
if( NULL != env_data ) {
fclose(env_data);
}
unlink(file_name);
if( NULL != tmp_str ){
free(tmp_str);
}
return exit_status;
}
/*****************************************
* OPAL CR Entry Point Functionality
*****************************************/
/*
* Used only for debugging SIGPIPE problems
*/
static void opal_cr_sigpipe_debug_signal_handler (int signo)
{
int sleeper = 1;
if( !opal_cr_debug_sigpipe ) {
opal_output_verbose(10, opal_cr_output,
"opal_cr: sigpipe_debug: Debug SIGPIPE Not enabled :(\n");
return;
}
opal_output(0,
"opal_cr: sigpipe_debug: Debug SIGPIPE [%d]: PID (%d)\n",
signo, getpid());
while(sleeper == 1 ) {
sleep(1);
}
}
#if OPAL_ENABLE_FT_THREAD == 1
static void* opal_cr_thread_fn(opal_object_t *obj)
{
/* Sanity Check */
if( !opal_cr_thread_use_if_avail ) {
return NULL;
}
if( opal_cr_debug_sigpipe ) {
if( SIG_ERR == signal(SIGPIPE, opal_cr_sigpipe_debug_signal_handler) ) {
;
}
}
/*
* Register this thread with the OPAL CRS
*/
if( NULL != opal_crs.crs_reg_thread ) {
if( OPAL_SUCCESS != opal_crs.crs_reg_thread() ) {
opal_output(0, "Error: Thread registration failed\n");
return NULL;
}
}
#if OPAL_ENABLE_CRDEBUG == 1
opal_cr_debug_free_threads[1] = opal_thread_get_self();
#endif
/*
* Wait to become active
*/
while( !opal_cr_thread_is_active && !opal_cr_thread_is_done) {
sched_yield();
}
if( opal_cr_thread_is_done ) {
return NULL;
}
/*
* While active
*/
while( opal_cr_thread_is_active && !opal_cr_thread_is_done) {
/*
* While no threads are in the MPI library then try to process
* checkpoint requests.
*/
OPAL_CR_THREAD_LOCK();
while ( !opal_cr_thread_in_library ) {
sched_yield();
usleep(opal_cr_thread_sleep_check);
OPAL_CR_TEST_CHECKPOINT_READY();
/* Sanity check */
if( OPAL_UNLIKELY(opal_cr_currently_stalled) ) {
OPAL_CR_TEST_CHECKPOINT_READY();
}
}
/*
* While they are in the MPI library yield
*/
OPAL_CR_THREAD_UNLOCK();
while ( opal_cr_thread_in_library && opal_cr_thread_is_active ) {
usleep(opal_cr_thread_sleep_wait);
}
}
return NULL;
}
void opal_cr_thread_init_library(void)
{
if( !opal_cr_thread_use_if_avail ) {
OPAL_CR_TEST_CHECKPOINT_READY();
} else {
/* Activate the CR Thread */
opal_cr_thread_in_library = false;
opal_cr_thread_is_done = false;
opal_cr_thread_is_active = true;
}
}
void opal_cr_thread_finalize_library(void)
{
if( !opal_cr_thread_use_if_avail ) {
OPAL_CR_TEST_CHECKPOINT_READY();
} else {
/* Deactivate the CR Thread */
opal_cr_thread_is_done = true;
opal_cr_thread_is_active = false;
OPAL_CR_LOCK();
opal_cr_thread_in_library = true;
}
}
void opal_cr_thread_abort_library(void)
{
if( !opal_cr_thread_use_if_avail ) {
OPAL_CR_TEST_CHECKPOINT_READY();
} else {
/* Deactivate the CR Thread */
opal_cr_thread_is_done = true;
opal_cr_thread_is_active = false;
OPAL_CR_LOCK();
opal_cr_thread_in_library = true;
}
}
void opal_cr_thread_enter_library(void)
{
if( !opal_cr_thread_use_if_avail ) {
OPAL_CR_TEST_CHECKPOINT_READY();
} else {
/* Lock out the CR Thread */
OPAL_CR_LOCK();
}
}
void opal_cr_thread_exit_library(void)
{
if( !opal_cr_thread_use_if_avail ) {
OPAL_CR_TEST_CHECKPOINT_READY();
} else {
/* Allow CR Thread to continue */
OPAL_CR_UNLOCK();
}
}
void opal_cr_thread_noop_progress(void)
{
if( !opal_cr_thread_use_if_avail ) {
OPAL_CR_TEST_CHECKPOINT_READY();
}
}
#endif /* OPAL_ENABLE_FT_THREAD == 1 */
static double opal_cr_get_time() {
double wtime;
#if OPAL_TIMER_USEC_NATIVE
wtime = (double)opal_timer_base_get_usec() / 1000000.0;
#else
struct timeval tv;
gettimeofday(&tv, NULL);
wtime = tv.tv_sec;
wtime += (double)tv.tv_usec / 1000000.0;
#endif
return wtime;
}
void opal_cr_set_time(int idx)
{
if(idx < OPAL_CR_TIMER_MAX ) {
if( timer_start[idx] <= 0.0 ) {
timer_start[idx] = opal_cr_get_time();
}
}
}
void opal_cr_clear_timers(void)
{
int i;
for(i = 0; i < OPAL_CR_TIMER_MAX; ++i) {
timer_start[i] = 0.0;
}
}
static void display_indv_timer_core(double diff, char *str) {
double total = 0;
double perc = 0;
total = timer_start[OPAL_CR_TIMER_MAX-1] - timer_start[OPAL_CR_TIMER_ENTRY0];
perc = (diff/total) * 100;
opal_output(0,
"opal_cr: timing: %-20s = %10.2f s\t%10.2f s\t%6.2f\n",
str,
diff,
total,
perc);
return;
}
void opal_cr_display_all_timers(void)
{
double diff = 0.0;
char * label = NULL;
if( opal_cr_timing_target_rank != opal_cr_timing_my_rank ) {
return;
}
opal_output(0, "OPAL CR Timing: ******************** Summary Begin\n");
/********** Entry into the system **********/
label = strdup("Start Entry Point");
if( opal_cr_timing_barrier_enabled ) {
diff = timer_start[OPAL_CR_TIMER_CRCPBR0] - timer_start[OPAL_CR_TIMER_ENTRY0];
} else {
diff = timer_start[OPAL_CR_TIMER_CRCP0] - timer_start[OPAL_CR_TIMER_ENTRY0];
}
display_indv_timer_core(diff, label);
free(label);
/********** CRCP Protocol **********/
label = strdup("CRCP Protocol");
if( opal_cr_timing_barrier_enabled ) {
diff = timer_start[OPAL_CR_TIMER_CRCPBR1] - timer_start[OPAL_CR_TIMER_CRCP0];
} else {
diff = timer_start[OPAL_CR_TIMER_P2P0] - timer_start[OPAL_CR_TIMER_CRCP0];
}
display_indv_timer_core(diff, label);
free(label);
/********** P2P Suspend **********/
label = strdup("P2P Suspend");
if( opal_cr_timing_barrier_enabled ) {
diff = timer_start[OPAL_CR_TIMER_P2PBR0] - timer_start[OPAL_CR_TIMER_P2P0];
} else {
diff = timer_start[OPAL_CR_TIMER_CORE0] - timer_start[OPAL_CR_TIMER_P2P0];
}
display_indv_timer_core(diff, label);
free(label);
/********** Checkpoint to Disk **********/
label = strdup("Checkpoint");
diff = timer_start[OPAL_CR_TIMER_CORE1] - timer_start[OPAL_CR_TIMER_CORE0];
display_indv_timer_core(diff, label);
free(label);
/********** P2P Reactivation **********/
label = strdup("P2P Reactivation");
if( opal_cr_timing_barrier_enabled ) {
diff = timer_start[OPAL_CR_TIMER_P2PBR2] - timer_start[OPAL_CR_TIMER_CORE1];
} else {
diff = timer_start[OPAL_CR_TIMER_CRCP1] - timer_start[OPAL_CR_TIMER_CORE1];
}
display_indv_timer_core(diff, label);
free(label);
/********** CRCP Protocol Finalize **********/
label = strdup("CRCP Cleanup");
if( opal_cr_timing_barrier_enabled ) {
diff = timer_start[OPAL_CR_TIMER_COREBR1] - timer_start[OPAL_CR_TIMER_CRCP1];
} else {
diff = timer_start[OPAL_CR_TIMER_CORE2] - timer_start[OPAL_CR_TIMER_CRCP1];
}
display_indv_timer_core(diff, label);
free(label);
/********** Exit the system **********/
label = strdup("Finish Entry Point");
diff = timer_start[OPAL_CR_TIMER_ENTRY4] - timer_start[OPAL_CR_TIMER_CORE2];
display_indv_timer_core(diff, label);
free(label);
opal_output(0, "OPAL CR Timing: ******************** Summary End\n");
}
#if OPAL_ENABLE_CRDEBUG == 1
int opal_cr_debug_set_current_ckpt_thread_self(void)
{
int t;
if( NULL == opal_cr_debug_free_threads ) {
opal_cr_debug_num_free_threads = 3;
opal_cr_debug_free_threads = (opal_thread_t **)malloc(sizeof(opal_thread_t *) * opal_cr_debug_num_free_threads );
for(t = 0; t < opal_cr_debug_num_free_threads; ++t ) {
opal_cr_debug_free_threads[t] = NULL;
}
}
opal_cr_debug_free_threads[0] = opal_thread_get_self();
return OPAL_SUCCESS;
}
int opal_cr_debug_clear_current_ckpt_thread(void)
{
opal_cr_debug_free_threads[0] = NULL;
return OPAL_SUCCESS;
}
int MPIR_checkpoint_debugger_detach(void) {
/* This function is meant to be a noop function for checkpoint/restart
* enabled debugging functionality */
#if 0
/* Once the debugger can successfully force threads into the function below,
* then we can uncomment this line */
if( MPIR_debug_with_checkpoint ) {
opal_cr_debug_threads_already_waiting = true;
}
#endif
return OPAL_SUCCESS;
}
void MPIR_checkpoint_debugger_signal_handler(int signo)
{
opal_output_verbose(1, opal_cr_output,
"crs: MPIR_checkpoint_debugger_signal_handler(): Enter Debug signal handler...");
MPIR_checkpoint_debugger_waitpoint();
opal_output_verbose(1, opal_cr_output,
"crs: MPIR_checkpoint_debugger_signal_handler(): Leave Debug signal handler...");
}
void *MPIR_checkpoint_debugger_waitpoint(void)
{
int t;
opal_thread_t *thr = NULL;
thr = opal_thread_get_self();
/*
* Sanity check, if the debugger is not going to attach, then do not wait
* Make sure to open the debug gate, so that threads can get out
*/
if( !MPIR_debug_with_checkpoint ) {
opal_output_verbose(1, opal_cr_output,
"crs: MPIR_checkpoint_debugger_waitpoint(): Debugger is not attaching... (%d)",
(int)thr->t_handle);
MPIR_checkpoint_debug_gate = 1;
return NULL;
}
else {
opal_output_verbose(1, opal_cr_output,
"crs: MPIR_checkpoint_debugger_waitpoint(): Waiting for the Debugger to attach... (%d)",
(int)thr->t_handle);
MPIR_checkpoint_debug_gate = 0;
}
/*
* Let special threads escape without waiting, they will wait later
*/
for(t = 0; t < opal_cr_debug_num_free_threads; ++t) {
if( opal_cr_debug_free_threads[t] != NULL &&
opal_thread_self_compare(opal_cr_debug_free_threads[t]) ) {
opal_output_verbose(1, opal_cr_output,
"crs: MPIR_checkpoint_debugger_waitpoint(): Checkpointing thread does not wait here... (%d)",
(int)thr->t_handle);
return NULL;
}
}
/*
* Force all other threads into the waiting function,
* unless they are already in there, then just return so we do not nest
* calls into this wait function and potentially confuse the debugger.
*/
if( opal_cr_debug_threads_already_waiting ) {
opal_output_verbose(1, opal_cr_output,
"crs: MPIR_checkpoint_debugger_waitpoint(): Threads are already waiting from debugger detach, do not wait here... (%d)",
(int)thr->t_handle);
return NULL;
} else {
opal_output_verbose(1, opal_cr_output,
"crs: MPIR_checkpoint_debugger_waitpoint(): Wait... (%d)",
(int)thr->t_handle);
return MPIR_checkpoint_debugger_breakpoint();
}
}
/*
* A tight loop to wait for debugger to release this process from the
* breakpoint.
*/
void *MPIR_checkpoint_debugger_breakpoint(void)
{
/* spin until debugger attaches and releases us */
while (MPIR_checkpoint_debug_gate == 0) {
#if defined(HAVE_USLEEP)
usleep(100000); /* microseconds */
#else
sleep(1); /* seconds */
#endif
}
opal_cr_debug_threads_already_waiting = false;
return NULL;
}
#endif
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