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Commit 72afe222 authored by Shane Snyder's avatar Shane Snyder
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port swim module over to new interface changes

parent dcd3fc52
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src/ssg-internal.h
View file @ 72afe222
......@@ -17,10 +17,7 @@ extern "C" {
#include <abt.h>
#include <margo.h>
#include <ssg.h>
#if USE_SWIM_FD
#include "swim-fd/swim-fd.h"
#endif
#include "ssg.h"
/* debug printing macro for SSG */
/* TODO: direct debug output to file? */
......@@ -58,11 +55,12 @@ struct ssg_group
ssg_group_id_t id;
int self_rank;
ssg_group_view_t view;
#if USE_SWIM_FD
swim_context_t *swim_ctx;
#endif
void *fd_ctx; /* failure detector context (currently just SWIM) */
};
/* XXX: is this right? can this be a global? */
extern margo_instance_id ssg_mid;
#ifdef __cplusplus
}
#endif
src/ssg.c
View file @ 72afe222
......@@ -4,7 +4,7 @@
* See COPYRIGHT in top-level directory.
*/
#include <ssg-config.h>
#include "ssg-config.h"
#include <sys/types.h>
#include <sys/stat.h>
......@@ -19,7 +19,7 @@
#include <abt.h>
#include <margo.h>
#include <ssg.h>
#include "ssg.h"
#include "ssg-internal.h"
#if USE_SWIM_FD
#include "swim-fd/swim-fd.h"
......@@ -32,7 +32,7 @@ static const char ** ssg_setup_addr_str_list(
char * buf, int num_addrs);
/* XXX: is this right? can this be a global? */
static margo_instance_id ssg_mid = MARGO_INSTANCE_NULL;
margo_instance_id ssg_mid = MARGO_INSTANCE_NULL;
/***************************************************
*** SSG runtime intialization/shutdown routines ***
......@@ -145,24 +145,18 @@ ssg_group_id_t ssg_group_create(
}
SSG_DEBUG(g, "group lookup successful (size=%d)\n", group_size);
#if 0
#if USE_SWIM_FD
// initialize swim failure detector
/* initialize swim failure detector */
// TODO: we should probably barrier or sync somehow to avoid rpc failures
// due to timing skew of different ranks initializing swim
s->swim_ctx = swim_init(s, 1);
if (s->swim_ctx == NULL)
{
ssg_finalize(s);
s = NULL;
}
#endif
g->fd_ctx = (void *)swim_init(g, 1);
if (g->fd_ctx == NULL) goto fini;
#endif
/* TODO: last step => add reference to this group to SSG runtime state */
/* don't free these pointers on success */
//self_addr = HG_ADDR_NULL; /* TODO: free this in ssg_group_destroy */
self_addr = HG_ADDR_NULL; /* TODO: free this in ssg_group_destroy */
g = NULL;
fini:
if (hgcl && self_addr != HG_ADDR_NULL) HG_Addr_free(hgcl, self_addr);
......
src/swim-fd/swim-fd-internal.h
View file @ 72afe222
......@@ -12,6 +12,7 @@ extern "C" {
#include <ssg.h>
/* SWIM protocol parameter defaults */
#define SWIM_DEF_PROTOCOL_PERIOD_LEN 2000.0 /* milliseconds */
#define SWIM_DEF_SUSPECT_TIMEOUT 5 /* protocol period lengths */
#define SWIM_DEF_SUBGROUP_SIZE 2
......@@ -19,6 +20,8 @@ extern "C" {
#define SWIM_MAX_PIGGYBACK_ENTRIES 8
#define SWIM_MAX_PIGGYBACK_TX_COUNT 50
#define SWIM_MEMBER_RANK_UNKNOWN (-1)
typedef int64_t swim_member_id_t;
typedef uint8_t swim_member_status_t;
typedef uint32_t swim_member_inc_nr_t;
......@@ -64,21 +67,23 @@ struct swim_context
/* SWIM ping function prototypes */
void swim_register_ping_rpcs(
ssg_t s);
ssg_group_t *g);
void swim_dping_send_ult(
void *t_arg);
void swim_iping_send_ult(
void *t_arg);
#if 0
/* SWIM membership update function prototypes */
void swim_retrieve_membership_updates(
ssg_t s,
ssg_group_t *g,
swim_member_update_t *updates,
int update_count);
void swim_apply_membership_updates(
ssg_t s,
ssg_group_t *g,
swim_member_update_t *updates,
int update_count);
#endif
#ifdef __cplusplus
}
......
src/swim-fd/swim-fd-ping.c
View file @ 72afe222
......@@ -11,8 +11,10 @@
#include <assert.h>
#include <mercury.h>
#include <abt.h>
#include <margo.h>
#include <ssg.h>
#include "ssg.h"
#include "ssg-internal.h"
#include "swim-fd.h"
#include "swim-fd-internal.h"
......@@ -39,7 +41,9 @@ typedef struct swim_message_s
swim_member_update_t pb_buf[SWIM_MAX_PIGGYBACK_ENTRIES]; //TODO: can we do dynamic array instead?
} swim_message_t;
static hg_return_t hg_proc_swim_message_t(hg_proc_t proc, void *data);
/* HG encode/decode routines for SWIM RPCs */
static hg_return_t hg_proc_swim_message_t(
hg_proc_t proc, void *data);
MERCURY_GEN_PROC(swim_dping_req_t, \
((swim_message_t) (msg)));
......@@ -54,33 +58,32 @@ MERCURY_GEN_PROC(swim_iping_req_t, \
MERCURY_GEN_PROC(swim_iping_resp_t, \
((swim_message_t) (msg)));
/* SWIM message pack/unpack prototypes */
static void swim_pack_message(
ssg_group_t *g, swim_message_t *msg);
static void swim_unpack_message(
ssg_group_t *g, swim_message_t *msg);
DECLARE_MARGO_RPC_HANDLER(swim_dping_recv_ult)
DECLARE_MARGO_RPC_HANDLER(swim_iping_recv_ult)
static void swim_pack_message(ssg_t s, swim_message_t *msg);
static void swim_unpack_message(ssg_t s, swim_message_t *msg);
static hg_id_t dping_rpc_id;
static hg_id_t iping_rpc_id;
void swim_register_ping_rpcs(
ssg_t s)
ssg_group_t *g)
{
hg_class_t *hg_cls = margo_get_class(s->mid);
hg_class_t *hg_cls = margo_get_class(ssg_mid);
/* register RPC handlers for SWIM pings */
dping_rpc_id = MERCURY_REGISTER(hg_cls, "dping", swim_dping_req_t,
dping_rpc_id = MERCURY_REGISTER(hg_cls, "swim_dping", swim_dping_req_t,
swim_dping_resp_t, swim_dping_recv_ult_handler);
iping_rpc_id = MERCURY_REGISTER(hg_cls, "iping", swim_iping_req_t,
iping_rpc_id = MERCURY_REGISTER(hg_cls, "swim_iping", swim_iping_req_t,
swim_iping_resp_t, swim_iping_recv_ult_handler);
/* TODO: disable responses for RPCs to make them one-way operations */
//HG_Registered_disable_response(hg_cls, dping_rpc_id, HG_TRUE);
//HG_Registered_disable_response(hg_cls, iping_rpc_id, HG_TRUE);
/* register swim context data structure with each RPC type */
HG_Register_data(hg_cls, dping_rpc_id, s, NULL);
HG_Register_data(hg_cls, iping_rpc_id, s, NULL);
HG_Register_data(hg_cls, dping_rpc_id, g, NULL);
HG_Register_data(hg_cls, iping_rpc_id, g, NULL);
return;
}
......@@ -90,22 +93,22 @@ void swim_register_ping_rpcs(
********************************/
static int swim_send_dping(
ssg_t s, swim_member_id_t target);
ssg_group_t *g, swim_member_id_t target);
void swim_dping_send_ult(
void *t_arg)
{
ssg_t s = (ssg_t)t_arg;
ssg_group_t *g = (ssg_group_t *)t_arg;
swim_context_t *swim_ctx;
swim_member_id_t target;
int ret;
assert(s != SSG_NULL);
swim_ctx = s->swim_ctx;
assert(g != NULL);
swim_ctx = (swim_context_t *)g->fd_ctx;
assert(swim_ctx != NULL);
target = swim_ctx->ping_target;
ret = swim_send_dping(s, target);
ret = swim_send_dping(g, target);
if (ret == 0)
{
/* mark this dping req as acked, double checking to make
......@@ -120,9 +123,9 @@ void swim_dping_send_ult(
}
static int swim_send_dping(
ssg_t s, swim_member_id_t target)
ssg_group_t *g, swim_member_id_t target)
{
swim_context_t *swim_ctx = s->swim_ctx;
swim_context_t *swim_ctx = (swim_context_t *)g->fd_ctx;
hg_addr_t target_addr = HG_ADDR_NULL;
hg_handle_t handle;
swim_dping_req_t dping_req;
......@@ -130,22 +133,22 @@ static int swim_send_dping(
hg_return_t hret;
int ret = -1;
target_addr = s->view.member_states[target].addr;
target_addr = g->view.member_states[target].addr;
if(target_addr == HG_ADDR_NULL)
return(ret);
hret = HG_Create(margo_get_context(s->mid), target_addr, dping_rpc_id,
hret = HG_Create(margo_get_context(ssg_mid), target_addr, dping_rpc_id,
&handle);
if(hret != HG_SUCCESS)
return(ret);
SSG_DEBUG(s, "SWIM: send dping req to %d\n", (int)target);
SSG_DEBUG(g, "SWIM: send dping req to %d\n", (int)target);
/* fill the direct ping request with current membership state */
swim_pack_message(s, &(dping_req.msg));
swim_pack_message(g, &(dping_req.msg));
/* send a direct ping that expires at the end of the protocol period */
hret = margo_forward_timed(s->mid, handle, &dping_req,
hret = margo_forward_timed(ssg_mid, handle, &dping_req,
swim_ctx->prot_period_len);
if (hret == HG_SUCCESS)
{
......@@ -153,17 +156,17 @@ static int swim_send_dping(
if(hret != HG_SUCCESS)
return(ret);
SSG_DEBUG(s, "SWIM: recv dping ack from %d\n", (int)dping_resp.msg.source_id);
SSG_DEBUG(g, "SWIM: recv dping ack from %d\n", (int)dping_resp.msg.source_id);
assert(dping_resp.msg.source_id == target);
/* extract target's membership state from response */
swim_unpack_message(s, &(dping_resp.msg));
swim_unpack_message(g, &(dping_resp.msg));
ret = 0;
}
else if(hret != HG_TIMEOUT)
{
SSG_DEBUG(s, "SWIM: dping req error from %d (err=%d)\n", (int)target, hret);
SSG_DEBUG(g, "SWIM: dping req error from %d (err=%d)\n", (int)target, hret);
}
HG_Destroy(handle);
......@@ -172,7 +175,7 @@ static int swim_send_dping(
static void swim_dping_recv_ult(hg_handle_t handle)
{
ssg_t s;
ssg_group_t *g;
swim_context_t *swim_ctx;
const struct hg_info *info;
swim_dping_req_t dping_req;
......@@ -183,27 +186,27 @@ static void swim_dping_recv_ult(hg_handle_t handle)
info = HG_Get_info(handle);
if(info == NULL)
return;
s = (ssg_t)HG_Registered_data(info->hg_class, dping_rpc_id);
assert(s != SSG_NULL);
swim_ctx = s->swim_ctx;
g = (ssg_group_t *)HG_Registered_data(info->hg_class, dping_rpc_id);
assert(g != NULL);
swim_ctx = (swim_context_t *)g->fd_ctx;
assert(swim_ctx != NULL);
hret = HG_Get_input(handle, &dping_req);
if(hret != HG_SUCCESS)
return;
SSG_DEBUG(s, "SWIM: recv dping req from %d\n", (int)dping_req.msg.source_id);
SSG_DEBUG(g, "SWIM: recv dping req from %d\n", (int)dping_req.msg.source_id);
/* extract sender's membership state from request */
swim_unpack_message(s, &(dping_req.msg));
swim_unpack_message(g, &(dping_req.msg));
/* fill the direct ping response with current membership state */
swim_pack_message(s, &(dping_resp.msg));
swim_pack_message(g, &(dping_resp.msg));
SSG_DEBUG(s, "SWIM: send dping ack to %d\n", (int)dping_req.msg.source_id);
SSG_DEBUG(g, "SWIM: send dping ack to %d\n", (int)dping_req.msg.source_id);
/* respond to sender of the dping req */
margo_respond(s->mid, handle, &dping_resp);
margo_respond(ssg_mid, handle, &dping_resp);
HG_Destroy(handle);
return;
......@@ -217,55 +220,55 @@ DEFINE_MARGO_RPC_HANDLER(swim_dping_recv_ult)
void swim_iping_send_ult(
void *t_arg)
{
ssg_t s = (ssg_t)t_arg;
ssg_group_t *g = (ssg_group_t *)t_arg;
swim_context_t *swim_ctx;
int i;
swim_member_id_t my_subgroup_member = SSG_MEMBER_RANK_UNKNOWN;
swim_member_id_t my_subgroup_member = SWIM_MEMBER_RANK_UNKNOWN;
hg_addr_t target_addr = HG_ADDR_NULL;
hg_handle_t handle;
swim_iping_req_t iping_req;
swim_iping_resp_t iping_resp;
hg_return_t hret;
assert(s != SSG_NULL);
swim_ctx = s->swim_ctx;
assert(g != NULL);
swim_ctx = (swim_context_t *)g->fd_ctx;
assert(swim_ctx != NULL);
for(i = 0; i < swim_ctx->prot_subgroup_sz; i++)
{
if(swim_ctx->subgroup_members[i] != SSG_MEMBER_RANK_UNKNOWN)
if(swim_ctx->subgroup_members[i] != SWIM_MEMBER_RANK_UNKNOWN)
{
my_subgroup_member = swim_ctx->subgroup_members[i];
swim_ctx->subgroup_members[i] = SSG_MEMBER_RANK_UNKNOWN;
swim_ctx->subgroup_members[i] = SWIM_MEMBER_RANK_UNKNOWN;
break;
}
}
assert(my_subgroup_member != SSG_MEMBER_RANK_UNKNOWN);
assert(my_subgroup_member != SWIM_MEMBER_RANK_UNKNOWN);
target_addr = s->view.member_states[my_subgroup_member].addr;
target_addr = g->view.member_states[my_subgroup_member].addr;
if(target_addr == HG_ADDR_NULL)
return;
hret = HG_Create(margo_get_context(s->mid), target_addr, iping_rpc_id,
hret = HG_Create(margo_get_context(ssg_mid), target_addr, iping_rpc_id,
&handle);
if(hret != HG_SUCCESS)
return;
SSG_DEBUG(s, "SWIM: send iping req to %d (target=%d)\n",
SSG_DEBUG(g, "SWIM: send iping req to %d (target=%d)\n",
(int)my_subgroup_member, (int)swim_ctx->ping_target);
/* fill the indirect ping request with target member and current
* membership state
*/
iping_req.target_id = swim_ctx->ping_target;
swim_pack_message(s, &(iping_req.msg));
swim_pack_message(g, &(iping_req.msg));
/* send this indirect ping */
/* NOTE: the timeout is just the protocol period length minus
* the dping timeout, which should cause this iping to timeout
* right at the end of the current protocol period.
*/
hret = margo_forward_timed(s->mid, handle, &iping_req,
hret = margo_forward_timed(ssg_mid, handle, &iping_req,
(swim_ctx->prot_period_len - swim_ctx->dping_timeout));
if (hret == HG_SUCCESS)
{
......@@ -273,11 +276,11 @@ void swim_iping_send_ult(
if(hret != HG_SUCCESS)
return;
SSG_DEBUG(s, "SWIM: recv iping ack from %d (target=%d)\n",
SSG_DEBUG(g, "SWIM: recv iping ack from %d (target=%d)\n",
(int)iping_resp.msg.source_id, (int)swim_ctx->ping_target);
/* extract target's membership state from response */
swim_unpack_message(s, &(iping_resp.msg));
swim_unpack_message(g, &(iping_resp.msg));
/* mark this iping req as acked, double checking to make
* sure we aren't inadvertently ack'ing a ping request
......@@ -288,7 +291,7 @@ void swim_iping_send_ult(
}
else if(hret != HG_TIMEOUT)
{
SSG_DEBUG(s, "SWIM: iping req error from %d (target=%d, err=%d)\n",
SSG_DEBUG(g, "SWIM: iping req error from %d (target=%d, err=%d)\n",
(int)my_subgroup_member, hret, (int)swim_ctx->ping_target);
}
......@@ -298,7 +301,7 @@ void swim_iping_send_ult(
static void swim_iping_recv_ult(hg_handle_t handle)
{
ssg_t s;
ssg_group_t *g;
swim_context_t *swim_ctx;
const struct hg_info *info;
swim_iping_req_t iping_req;
......@@ -310,35 +313,35 @@ static void swim_iping_recv_ult(hg_handle_t handle)
info = HG_Get_info(handle);
if(info == NULL)
return;
s = (ssg_t)HG_Registered_data(info->hg_class, dping_rpc_id);
assert(s != SSG_NULL);
swim_ctx = s->swim_ctx;
g = (ssg_group_t *)HG_Registered_data(info->hg_class, dping_rpc_id);
assert(g != NULL);
swim_ctx = (swim_context_t *)g->fd_ctx;
assert(swim_ctx != NULL);
hret = HG_Get_input(handle, &iping_req);
if(hret != HG_SUCCESS)
return;
SSG_DEBUG(s, "SWIM: recv iping req from %d (target=%d)\n",
SSG_DEBUG(g, "SWIM: recv iping req from %d (target=%d)\n",
(int)iping_req.msg.source_id, (int)iping_req.target_id);
/* extract sender's membership state from request */
swim_unpack_message(s, &(iping_req.msg));
swim_unpack_message(g, &(iping_req.msg));
/* send direct ping to target on behalf of who sent iping req */
ret = swim_send_dping(s, iping_req.target_id);
ret = swim_send_dping(g, iping_req.target_id);
if(ret == 0)
{
/* if the dping req succeeds, fill the indirect ping
* response with current membership state
*/
swim_pack_message(s, &(iping_resp.msg));
swim_pack_message(g, &(iping_resp.msg));
SSG_DEBUG(s, "SWIM: send iping ack to %d (target=%d)\n",
SSG_DEBUG(g, "SWIM: send iping ack to %d (target=%d)\n",
(int)iping_req.msg.source_id, (int)iping_req.target_id);
/* respond to sender of the iping req */
margo_respond(s->mid, handle, &iping_resp);
margo_respond(ssg_mid, handle, &iping_resp);
}
HG_Destroy(handle);
......@@ -350,23 +353,26 @@ DEFINE_MARGO_RPC_HANDLER(swim_iping_recv_ult)
* SWIM ping helpers *
********************************/
static void swim_pack_message(ssg_t s, swim_message_t *msg)
/* TODO: refactor retrieve/apply api to make this less awkward */
static void swim_pack_message(ssg_group_t *g, swim_message_t *msg)
{
swim_context_t *swim_ctx = s->swim_ctx;
swim_context_t *swim_ctx = (swim_context_t *)g->fd_ctx;
memset(msg, 0, sizeof(*msg));
/* fill in self information */
msg->source_id = s->view.self_rank;
msg->source_inc_nr = swim_ctx->member_inc_nrs[s->view.self_rank];
msg->source_id = g->self_rank;
msg->source_inc_nr = swim_ctx->member_inc_nrs[g->self_rank];
#if 0
/* piggyback a set of membership states on this message */
swim_retrieve_membership_updates(s, msg->pb_buf, SWIM_MAX_PIGGYBACK_ENTRIES);
swim_retrieve_membership_updates(g, msg->pb_buf, SWIM_MAX_PIGGYBACK_ENTRIES);
#endif
return;
}
static void swim_unpack_message(ssg_t s, swim_message_t *msg)
static void swim_unpack_message(ssg_group_t *g, swim_message_t *msg)
{
swim_member_update_t sender_update;
......@@ -374,10 +380,12 @@ static void swim_unpack_message(ssg_t s, swim_message_t *msg)
sender_update.id = msg->source_id;
sender_update.status = SWIM_MEMBER_ALIVE;
sender_update.inc_nr = msg->source_inc_nr;
swim_apply_membership_updates(s, &sender_update, 1);
#if 0
swim_apply_membership_updates(g, &sender_update, 1);
/* update membership status using piggybacked membership updates */
swim_apply_membership_updates(s, msg->pb_buf, SWIM_MAX_PIGGYBACK_ENTRIES);
swim_apply_membership_updates(g, msg->pb_buf, SWIM_MAX_PIGGYBACK_ENTRIES);
#endif
return;
}
......
src/swim-fd/swim-fd.c
View file @ 72afe222
......@@ -12,7 +12,10 @@
#include <assert.h>
#include <time.h>
#include <ssg.h>
#include <abt.h>
#include <margo.h>
#include "ssg.h"
#include "ssg-internal.h"
#include "swim-fd.h"
#include "swim-fd-internal.h"
......@@ -38,21 +41,23 @@ static void swim_prot_ult(
static void swim_tick_ult(
void *t_arg);
#if 0
/* SWIM group membership utility function prototypes */
static void swim_suspect_member(
ssg_t s, swim_member_id_t member_id, swim_member_inc_nr_t inc_nr);
ssg_group_t *g, swim_member_id_t member_id, swim_member_inc_nr_t inc_nr);
static void swim_unsuspect_member(
ssg_t s, swim_member_id_t member_id, swim_member_inc_nr_t inc_nr);
ssg_group_t s, swim_member_id_t member_id, swim_member_inc_nr_t inc_nr);
static void swim_kill_member(
ssg_t s, swim_member_id_t member_id, swim_member_inc_nr_t inc_nr);
static void swim_update_suspected_members(
ssg_t s, double susp_timeout);
static void swim_add_recent_member_update(
ssg_t s, swim_member_update_t update);
#endif
static int swim_get_rand_group_member(
ssg_t s, swim_member_id_t *member_id);
ssg_group_t *g, swim_member_id_t *member_id);
static int swim_get_rand_group_member_set(
ssg_t s, swim_member_id_t *member_ids, int num_members,
ssg_group_t *g, swim_member_id_t *member_ids, int num_members,
swim_member_id_t excluded_id);
/******************************************************
......@@ -60,32 +65,32 @@ static int swim_get_rand_group_member_set(
******************************************************/
swim_context_t *swim_init(
ssg_t s,
ssg_group_t *g,
int active)
{
swim_context_t *swim_ctx;
int i, ret;
assert(s != SSG_NULL);
if (g == NULL) return NULL;
/* seed RNG with time+rank combination to avoid identical seeds */
srand(time(NULL) + s->view.self_rank);
srand(time(NULL) + g->self_rank);
/* allocate structure for storing swim context */
swim_ctx = malloc(sizeof(*swim_ctx));
assert(swim_ctx);
if (!swim_ctx) return NULL;
memset(swim_ctx, 0, sizeof(*swim_ctx));
/* initialize swim context */
swim_ctx->prot_pool = *margo_get_handler_pool(s->mid);
swim_ctx->ping_target = SSG_MEMBER_RANK_UNKNOWN;
swim_ctx->prot_pool = *margo_get_handler_pool(ssg_mid);
swim_ctx->ping_target = SWIM_MEMBER_RANK_UNKNOWN;
for(i = 0; i < SWIM_MAX_SUBGROUP_SIZE; i++)
swim_ctx->subgroup_members[i] = SSG_MEMBER_RANK_UNKNOWN;
swim_ctx->subgroup_members[i] = SWIM_MEMBER_RANK_UNKNOWN;
swim_ctx->member_inc_nrs = malloc(s->view.group_size *
swim_ctx->member_inc_nrs = malloc(g->view.group_size *
sizeof(*(swim_ctx->member_inc_nrs)));
assert(swim_ctx->member_inc_nrs);
memset(swim_ctx->member_inc_nrs, 0, s->view.group_size *
memset(swim_ctx->member_inc_nrs, 0, g->view.group_size *
sizeof(*(swim_ctx->member_inc_nrs)));
/* set protocol parameters */
......@@ -93,11 +98,11 @@ swim_context_t *swim_init(
swim_ctx->prot_susp_timeout = SWIM_DEF_SUSPECT_TIMEOUT;
swim_ctx->prot_subgroup_sz = SWIM_DEF_SUBGROUP_SIZE;
swim_register_ping_rpcs(s);
swim_register_ping_rpcs(g);
if(active)
{
ret = ABT_thread_create(swim_ctx->prot_pool, swim_prot_ult, s,
ret = ABT_thread_create(swim_ctx->prot_pool, swim_prot_ult, g,
ABT_THREAD_ATTR_NULL, &(swim_ctx->prot_thread));
if(ret != ABT_SUCCESS)
{
......@@ -113,17 +118,18 @@ static void swim_prot_ult(
void *t_arg)
{
int ret;
ssg_t s = (ssg_t)t_arg;
ssg_group_t *g = (ssg_group_t *)t_arg;
swim_context_t *swim_ctx = (swim_context_t *)g->fd_ctx;
assert(s != SSG_NULL);
assert(g != NULL);
SSG_DEBUG(s, "SWIM: protocol start (period_len=%.4f, susp_timeout=%d, subgroup_size=%d)\n",
s->swim_ctx->prot_period_len, s->swim_ctx->prot_susp_timeout,