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openmpi/orte/orted/pmix/pmix_server_connection.c
Ralph Castain aec5cd08bd Per the PMIx RFC: 
WHAT:    Merge the PMIx branch into the devel repo, creating a new
               OPAL “lmix” framework to abstract PMI support for all RTEs.
               Replace the ORTE daemon-level collectives with a new PMIx
               server and update the ORTE grpcomm framework to support
               server-to-server collectives

WHY:      We’ve had problems dealing with variations in PMI implementations,
               and need to extend the existing PMI definitions to meet exascale
               requirements.

WHEN:   Mon, Aug 25

WHERE:  https://github.com/rhc54/ompi-svn-mirror.git

Several community members have been working on a refactoring of the current PMI support within OMPI. Although the APIs are common, Slurm and Cray implement a different range of capabilities, and package them differently. For example, Cray provides an integrated PMI-1/2 library, while Slurm separates the two and requires the user to specify the one to be used at runtime. In addition, several bugs in the Slurm implementations have caused problems requiring extra coding.

All this has led to a slew of #if’s in the PMI code and bugs when the corner-case logic for one implementation accidentally traps the other. Extending this support to other implementations would have increased this complexity to an unacceptable level.

Accordingly, we have:

* created a new OPAL “pmix” framework to abstract the PMI support, with separate components for Cray, Slurm PMI-1, and Slurm PMI-2 implementations.

* Replaced the current ORTE grpcomm daemon-based collective operation with an integrated PMIx server, and updated the grpcomm APIs to provide more flexible, multi-algorithm support for collective operations. At this time, only the xcast and allgather operations are supported.

* Replaced the current global collective id with a signature based on the names of the participating procs. The allows an unlimited number of collectives to be executed by any group of processes, subject to the requirement that only one collective can be active at a time for a unique combination of procs. Note that a proc can be involved in any number of simultaneous collectives - it is the specific combination of procs that is subject to the constraint

* removed the prior OMPI/OPAL modex code

* added new macros for executing modex send/recv to simplify use of the new APIs. The send macros allow the caller to specify whether or not the BTL supports async modex operations - if so, then the non-blocking “fence” operation is used, if the active PMIx component supports it. Otherwise, the default is a full blocking modex exchange as we currently perform.

* retained the current flag that directs us to use a blocking fence operation, but only to retrieve data upon demand

This commit was SVN r32570.
2014-08-21 18:56:47 +00:00

509 строки
19 KiB
C
Исходник Ответственный История

/*
* Copyright (c) 2004-2010 The Trustees of Indiana University and Indiana
* University Research and Technology
* Corporation. All rights reserved.
* Copyright (c) 2004-2011 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) 2006-2013 Los Alamos National Security, LLC.
* All rights reserved.
* Copyright (c) 2009 Cisco Systems, Inc. All rights reserved.
* Copyright (c) 2011 Oak Ridge National Labs. All rights reserved.
* Copyright (c) 2013-2014 Intel, Inc. All rights reserved.
* $COPYRIGHT$
*
* Additional copyrights may follow
*
* $HEADER$
*/
#include "orte_config.h"
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <fcntl.h>
#ifdef HAVE_SYS_UIO_H
#include <sys/uio.h>
#endif
#ifdef HAVE_NET_UIO_H
#include <net/uio.h>
#endif
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#include "opal/opal_socket_errno.h"
#ifdef HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#ifdef HAVE_ARPA_INET_H
#include <arpa/inet.h>
#endif
#ifdef HAVE_NETINET_TCP_H
#include <netinet/tcp.h>
#endif
#include "opal/types.h"
#include "opal_stdint.h"
#include "opal/mca/backtrace/backtrace.h"
#include "opal/mca/base/mca_base_var.h"
#include "opal/mca/dstore/dstore.h"
#include "opal/mca/sec/sec.h"
#include "opal/util/output.h"
#include "opal/util/net.h"
#include "opal/util/error.h"
#include "opal/class/opal_hash_table.h"
#include "opal/mca/event/event.h"
#include "opal/runtime/opal.h"
#include "orte/util/name_fns.h"
#include "orte/mca/state/state.h"
#include "orte/runtime/orte_globals.h"
#include "orte/mca/errmgr/errmgr.h"
#include "orte/mca/ess/ess.h"
#include "orte/mca/routed/routed.h"
#include "orte/runtime/orte_wait.h"
#include "pmix_server_internal.h"
static int usock_peer_send_blocking(pmix_server_peer_t* peer,
int sd, void* data, size_t size);
static bool usock_peer_recv_blocking(pmix_server_peer_t* peer,
int sd, void* data, size_t size);
int pmix_server_send_connect_ack(pmix_server_peer_t* peer)
{
char *msg;
pmix_server_hdr_t hdr;
int rc;
size_t sdsize;
opal_sec_cred_t *cred;
opal_output_verbose(2, pmix_server_output,
"%s SEND CONNECT ACK", ORTE_NAME_PRINT(ORTE_PROC_MY_NAME));
/* send a handshake that includes our process identifier
* to ensure we are talking to another OMPI process
*/
memcpy(&hdr.id, ORTE_PROC_MY_NAME, sizeof(opal_identifier_t));
hdr.type = PMIX_USOCK_IDENT;
hdr.tag = UINT32_MAX;
/* get our security credential*/
if (OPAL_SUCCESS != (rc = opal_sec.get_my_credential(opal_dstore_internal,
(opal_identifier_t*)ORTE_PROC_MY_NAME, &cred))) {
ORTE_ERROR_LOG(rc);
return rc;
}
/* set the number of bytes to be read beyond the header */
hdr.nbytes = strlen(orte_version_string) + 1 + cred->size;
/* create a space for our message */
sdsize = (sizeof(hdr) + strlen(opal_version_string) + 1 + cred->size);
if (NULL == (msg = (char*)malloc(sdsize))) {
return ORTE_ERR_OUT_OF_RESOURCE;
}
memset(msg, 0, sdsize);
/* load the message */
memcpy(msg, &hdr, sizeof(hdr));
memcpy(msg+sizeof(hdr), opal_version_string, strlen(opal_version_string));
memcpy(msg+sizeof(hdr)+strlen(opal_version_string)+1, cred->credential, cred->size);
if (ORTE_SUCCESS != usock_peer_send_blocking(peer, peer->sd, msg, sdsize)) {
ORTE_ERROR_LOG(ORTE_ERR_UNREACH);
return ORTE_ERR_UNREACH;
}
return ORTE_SUCCESS;
}
/*
* Initialize events to be used by the peer instance for USOCK select/poll callbacks.
*/
void pmix_server_peer_event_init(pmix_server_peer_t* peer)
{
if (peer->sd >= 0) {
opal_event_set(orte_event_base,
&peer->recv_event,
peer->sd,
OPAL_EV_READ|OPAL_EV_PERSIST,
pmix_server_recv_handler,
peer);
opal_event_set_priority(&peer->recv_event, ORTE_MSG_PRI);
if (peer->recv_ev_active) {
opal_event_del(&peer->recv_event);
peer->recv_ev_active = false;
}
opal_event_set(orte_event_base,
&peer->send_event,
peer->sd,
OPAL_EV_WRITE|OPAL_EV_PERSIST,
pmix_server_send_handler,
peer);
opal_event_set_priority(&peer->send_event, ORTE_MSG_PRI);
if (peer->send_ev_active) {
opal_event_del(&peer->send_event);
peer->send_ev_active = false;
}
}
}
/*
* A blocking send on a non-blocking socket. Used to send the small amount of connection
* information that identifies the peers endpoint.
*/
static int usock_peer_send_blocking(pmix_server_peer_t* peer,
int sd, void* data, size_t size)
{
unsigned char* ptr = (unsigned char*)data;
size_t cnt = 0;
int retval;
opal_output_verbose(2, pmix_server_output,
"%s send blocking of %"PRIsize_t" bytes to socket %d",
ORTE_NAME_PRINT(ORTE_PROC_MY_NAME),
size, sd);
while (cnt < size) {
retval = send(sd, (char*)ptr+cnt, size-cnt, 0);
if (retval < 0) {
if (opal_socket_errno != EINTR && opal_socket_errno != EAGAIN && opal_socket_errno != EWOULDBLOCK) {
opal_output(0, "%s usock_peer_send_blocking: send() to socket %d failed: %s (%d)\n",
ORTE_NAME_PRINT(ORTE_PROC_MY_NAME), sd,
strerror(opal_socket_errno),
opal_socket_errno);
peer->state = PMIX_SERVER_FAILED;
CLOSE_THE_SOCKET(peer->sd);
return ORTE_ERR_UNREACH;
}
continue;
}
cnt += retval;
}
opal_output_verbose(2, pmix_server_output,
"%s blocking send complete to socket %d",
ORTE_NAME_PRINT(ORTE_PROC_MY_NAME), sd);
return ORTE_SUCCESS;
}
/*
* Receive the peers globally unique process identification from a newly
* connected socket and verify the expected response. If so, move the
* socket to a connected state.
*/
int pmix_server_recv_connect_ack(pmix_server_peer_t* pr, int sd,
pmix_server_hdr_t *dhdr)
{
char *msg;
char *version;
int rc;
opal_sec_cred_t creds;
pmix_server_peer_t *peer;
pmix_server_hdr_t hdr;
orte_process_name_t sender;
opal_output_verbose(2, pmix_server_output,
"%s RECV CONNECT ACK FROM %s ON SOCKET %d",
ORTE_NAME_PRINT(ORTE_PROC_MY_NAME),
(NULL == pr) ? "UNKNOWN" : ORTE_NAME_PRINT(&pr->name), sd);
peer = pr;
/* ensure all is zero'd */
memset(&hdr, 0, sizeof(pmix_server_hdr_t));
if (usock_peer_recv_blocking(peer, sd, &hdr, sizeof(pmix_server_hdr_t))) {
if (NULL != peer) {
/* If the peer state is CONNECT_ACK, then we were waiting for
* the connection to be ack'd
*/
if (peer->state != PMIX_SERVER_CONNECT_ACK) {
/* handshake broke down - abort this connection */
opal_output(0, "%s RECV CONNECT BAD HANDSHAKE FROM %s ON SOCKET %d",
ORTE_NAME_PRINT(ORTE_PROC_MY_NAME),
ORTE_NAME_PRINT(&peer->name), sd);
peer->state = PMIX_SERVER_FAILED;
CLOSE_THE_SOCKET(peer->sd);
return ORTE_ERR_UNREACH;
}
}
} else {
/* unable to complete the recv */
opal_output_verbose(2, pmix_server_output,
"%s unable to complete recv of connect-ack from %s ON SOCKET %d",
ORTE_NAME_PRINT(ORTE_PROC_MY_NAME),
(NULL == peer) ? "UNKNOWN" : ORTE_NAME_PRINT(&peer->name), sd);
return ORTE_ERR_UNREACH;
}
/* if the requestor wanted the header returned, then do so now */
if (NULL != dhdr) {
*dhdr = hdr;
}
if (hdr.type != PMIX_USOCK_IDENT) {
opal_output(0, "usock_peer_recv_connect_ack: invalid header type: %d\n", hdr.type);
if (NULL != peer) {
peer->state = PMIX_SERVER_FAILED;
CLOSE_THE_SOCKET(peer->sd);
} else {
CLOSE_THE_SOCKET(sd);
}
return ORTE_ERR_UNREACH;
}
opal_output_verbose(2, pmix_server_output,
"%s connect-ack recvd from %s",
ORTE_NAME_PRINT(ORTE_PROC_MY_NAME),
(NULL == peer) ? "UNKNOWN" : ORTE_NAME_PRINT(&peer->name));
memcpy(&sender, &hdr.id, sizeof(opal_identifier_t));
/* if we don't already have it, get the peer */
if (NULL == peer) {
peer = pmix_server_peer_lookup(sd);
if (NULL == peer) {
opal_output_verbose(2, pmix_server_output,
"%s pmix_server_recv_connect: connection from new peer",
ORTE_NAME_PRINT(ORTE_PROC_MY_NAME));
peer = OBJ_NEW(pmix_server_peer_t);
peer->name = sender;
peer->state = PMIX_SERVER_ACCEPTING;
peer->sd = sd;
if (OPAL_SUCCESS != opal_hash_table_set_value_uint64(pmix_server_peers, sd, peer)) {
OBJ_RELEASE(peer);
CLOSE_THE_SOCKET(sd);
return ORTE_ERR_UNREACH;
}
} else if (PMIX_SERVER_CONNECTED == peer->state ||
PMIX_SERVER_CONNECTING == peer->state ||
PMIX_SERVER_CONNECT_ACK == peer->state) {
/* if I already have an established such a connection, then we need
* to reject this connection */
opal_output_verbose(2, pmix_server_output,
"%s EXISTING CONNECTION WITH %s",
ORTE_NAME_PRINT(ORTE_PROC_MY_NAME),
ORTE_NAME_PRINT(&sender));
if (peer->recv_ev_active) {
opal_event_del(&peer->recv_event);
peer->recv_ev_active = false;
}
if (peer->send_ev_active) {
opal_event_del(&peer->send_event);
peer->send_ev_active = false;
}
if (0 < peer->sd) {
CLOSE_THE_SOCKET(peer->sd);
peer->sd = -1;
}
peer->retries = 0;
}
} else {
/* compare the peers name to the expected value */
if (OPAL_EQUAL != orte_util_compare_name_fields(ORTE_NS_CMP_ALL, &peer->name, &sender)) {
opal_output(0, "%s usock_peer_recv_connect_ack: "
"received unexpected process identifier %s from %s\n",
ORTE_NAME_PRINT(ORTE_PROC_MY_NAME),
ORTE_NAME_PRINT(&sender),
ORTE_NAME_PRINT(&(peer->name)));
peer->state = PMIX_SERVER_FAILED;
CLOSE_THE_SOCKET(peer->sd);
return ORTE_ERR_UNREACH;
}
}
opal_output_verbose(2, pmix_server_output,
"%s connect-ack header from %s is okay",
ORTE_NAME_PRINT(ORTE_PROC_MY_NAME),
ORTE_NAME_PRINT(&peer->name));
/* get the authentication and version payload */
if (NULL == (msg = (char*)malloc(hdr.nbytes))) {
peer->state = PMIX_SERVER_FAILED;
CLOSE_THE_SOCKET(peer->sd);
return ORTE_ERR_OUT_OF_RESOURCE;
}
if (!usock_peer_recv_blocking(peer, sd, msg, hdr.nbytes)) {
/* unable to complete the recv */
opal_output_verbose(2, pmix_server_output,
"%s unable to complete recv of connect-ack from %s ON SOCKET %d",
ORTE_NAME_PRINT(ORTE_PROC_MY_NAME),
ORTE_NAME_PRINT(&peer->name), peer->sd);
free(msg);
return ORTE_ERR_UNREACH;
}
/* check that this is from a matching version */
version = (char*)(msg);
if (0 != strcmp(version, opal_version_string)) {
opal_output(0, "%s usock_peer_recv_connect_ack: "
"received different version from %s: %s instead of %s\n",
ORTE_NAME_PRINT(ORTE_PROC_MY_NAME),
ORTE_NAME_PRINT(&(peer->name)),
version, opal_version_string);
peer->state = PMIX_SERVER_FAILED;
CLOSE_THE_SOCKET(peer->sd);
free(msg);
return ORTE_ERR_UNREACH;
}
opal_output_verbose(2, pmix_server_output,
"%s connect-ack version from %s matches ours",
ORTE_NAME_PRINT(ORTE_PROC_MY_NAME),
ORTE_NAME_PRINT(&peer->name));
/* check security token */
creds.credential = (char*)(msg + strlen(version) + 1);
creds.size = hdr.nbytes - strlen(version) - 1;
if (OPAL_SUCCESS != (rc = opal_sec.authenticate(&creds))) {
ORTE_ERROR_LOG(rc);
}
free(msg);
opal_output_verbose(2, pmix_server_output,
"%s connect-ack %s authenticated",
ORTE_NAME_PRINT(ORTE_PROC_MY_NAME),
ORTE_NAME_PRINT(&peer->name));
/* if the requestor wanted the header returned, then they
* will complete their processing
*/
if (NULL != dhdr) {
return ORTE_SUCCESS;
}
/* connected */
pmix_server_peer_connected(peer);
if (2 <= opal_output_get_verbosity(pmix_server_output)) {
pmix_server_peer_dump(peer, "connected");
}
return ORTE_SUCCESS;
}
/*
* Setup peer state to reflect that connection has been established,
* and start any pending sends.
*/
void pmix_server_peer_connected(pmix_server_peer_t* peer)
{
opal_output_verbose(2, pmix_server_output,
"%s-%s usock_peer_connected on socket %d",
ORTE_NAME_PRINT(ORTE_PROC_MY_NAME),
ORTE_NAME_PRINT(&(peer->name)), peer->sd);
if (peer->timer_ev_active) {
opal_event_del(&peer->timer_event);
peer->timer_ev_active = false;
}
peer->state = PMIX_SERVER_CONNECTED;
/* ensure the recv event is active */
if (!peer->recv_ev_active) {
opal_event_add(&peer->recv_event, 0);
peer->recv_ev_active = true;
}
/* initiate send of first message on queue */
if (NULL == peer->send_msg) {
peer->send_msg = (pmix_server_send_t*)
opal_list_remove_first(&peer->send_queue);
}
if (NULL != peer->send_msg && !peer->send_ev_active) {
opal_event_add(&peer->send_event, 0);
peer->send_ev_active = true;
}
}
/*
* A blocking recv on a non-blocking socket. Used to receive the small amount of connection
* information that identifies the peers endpoint.
*/
static bool usock_peer_recv_blocking(pmix_server_peer_t* peer,
int sd, void* data, size_t size)
{
unsigned char* ptr = (unsigned char*)data;
size_t cnt = 0;
opal_output_verbose(2, pmix_server_output,
"%s waiting for connect ack from %s",
ORTE_NAME_PRINT(ORTE_PROC_MY_NAME),
(NULL == peer) ? "UNKNOWN" : ORTE_NAME_PRINT(&(peer->name)));
while (cnt < size) {
int retval = recv(sd, (char *)ptr+cnt, size-cnt, 0);
/* remote closed connection */
if (retval == 0) {
opal_output_verbose(2, pmix_server_output,
"%s-%s usock_peer_recv_blocking: "
"peer closed connection: peer state %d",
ORTE_NAME_PRINT(ORTE_PROC_MY_NAME),
(NULL == peer) ? "UNKNOWN" : ORTE_NAME_PRINT(&(peer->name)),
(NULL == peer) ? 0 : peer->state);
peer->state = PMIX_SERVER_FAILED;
CLOSE_THE_SOCKET(peer->sd);
return false;
}
/* socket is non-blocking so handle errors */
if (retval < 0) {
if (opal_socket_errno != EINTR &&
opal_socket_errno != EAGAIN &&
opal_socket_errno != EWOULDBLOCK) {
if (peer->state == PMIX_SERVER_CONNECT_ACK) {
/* If we overflow the listen backlog, it's
possible that even though we finished the three
way handshake, the remote host was unable to
transition the connection from half connected
(received the initial SYN) to fully connected
(in the listen backlog). We likely won't see
the failure until we try to receive, due to
timing and the like. The first thing we'll get
in that case is a RST packet, which receive
will turn into a connection reset by peer
errno. In that case, leave the socket in
CONNECT_ACK and propogate the error up to
recv_connect_ack, who will try to establish the
connection again */
opal_output_verbose(2, pmix_server_output,
"%s connect ack received error %s from %s",
ORTE_NAME_PRINT(ORTE_PROC_MY_NAME),
strerror(opal_socket_errno),
(NULL == peer) ? "UNKNOWN" : ORTE_NAME_PRINT(&(peer->name)));
return false;
} else {
opal_output(0,
"%s usock_peer_recv_blocking: "
"recv() failed for %s: %s (%d)\n",
ORTE_NAME_PRINT(ORTE_PROC_MY_NAME),
(NULL == peer) ? "UNKNOWN" : ORTE_NAME_PRINT(&(peer->name)),
strerror(opal_socket_errno),
opal_socket_errno);
if (NULL != peer) {
peer->state = PMIX_SERVER_FAILED;
CLOSE_THE_SOCKET(peer->sd);
} else {
CLOSE_THE_SOCKET(sd);
}
return false;
}
}
continue;
}
cnt += retval;
}
opal_output_verbose(2, pmix_server_output,
"%s connect ack received from %s",
ORTE_NAME_PRINT(ORTE_PROC_MY_NAME),
(NULL == peer) ? "UNKNOWN" : ORTE_NAME_PRINT(&(peer->name)));
return true;
}
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