ssg.c 25.2 KB
Newer Older
1 2 3 4 5 6
/*
 * Copyright (c) 2016 UChicago Argonne, LLC
 *
 * See COPYRIGHT in top-level directory.
 */

Jonathan Jenkins's avatar
Jonathan Jenkins committed
7 8 9 10
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
11
#include <errno.h>
Jonathan Jenkins's avatar
Jonathan Jenkins committed
12 13
#include <stdlib.h>
#include <string.h>
Jonathan Jenkins's avatar
Jonathan Jenkins committed
14
#include <assert.h>
Jonathan Jenkins's avatar
Jonathan Jenkins committed
15 16

#include <mercury_proc.h>
Jonathan Jenkins's avatar
Jonathan Jenkins committed
17
#include <mercury_macros.h>
Jonathan Jenkins's avatar
Jonathan Jenkins committed
18 19 20 21 22 23 24 25

#include <ssg.h>
#include <ssg-config.h>
#include "def.h"

#ifdef HAVE_MPI
#include <ssg-mpi.h>
#endif
Jonathan Jenkins's avatar
Jonathan Jenkins committed
26 27 28
#ifdef HAVE_MARGO
#include <ssg-margo.h>
#endif
Jonathan Jenkins's avatar
Jonathan Jenkins committed
29

Jonathan Jenkins's avatar
Jonathan Jenkins committed
30
#define DO_DEBUG 1
Jonathan Jenkins's avatar
Jonathan Jenkins committed
31 32 33 34 35 36 37 38 39 40
#define DEBUG(...) \
    do { \
        if(DO_DEBUG) { \
            printf(__VA_ARGS__); \
            fflush(stdout); \
        } \
    } while(0)

// helpers for looking up a group member
static hg_return_t ssg_lookup_cb(const struct hg_cb_info *info);
Jonathan Jenkins's avatar
Jonathan Jenkins committed
41 42 43

static char** setup_addr_str_list(int num_addrs, char * buf);

Jonathan Jenkins's avatar
Jonathan Jenkins committed
44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59
// helper for hashing (don't want to pull in jenkins hash)
// see http://www.isthe.com/chongo/tech/comp/fnv/index.html
static uint64_t fnv1a_64(void *data, size_t size);

#if HAVE_MARGO

MERCURY_GEN_PROC(barrier_in_t,
        ((int32_t)(barrier_id)) \
        ((int32_t)(rank)))

// barrier RPC decls
static void proc_barrier(void *arg);
DEFINE_MARGO_RPC_HANDLER(proc_barrier)

#endif

60
ssg_t ssg_init_config(const char * fname, int is_member)
Jonathan Jenkins's avatar
Jonathan Jenkins committed
61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138
{
    // file to read
    int fd = -1;
    struct stat st;

    // file content to parse
    char *rdbuf = NULL;
    ssize_t rdsz;

    // parse metadata (strtok)
    char *tok;

    // vars to build up the addr string list
    int addr_cap = 128;
    int addr_len = 0;
    int num_addrs = 0;
    void *buf = NULL;
    char **addr_strs = NULL;

    // return var
    ssg_t s = NULL;

    // misc return codes
    int ret;

    // open file for reading
    fd = open(fname, O_RDONLY);
    if (fd == -1) goto fini;

    // get file size
    ret = fstat(fd, &st);
    if (ret == -1) goto fini;

    // slurp file in all at once
    rdbuf = malloc(st.st_size+1);
    if (rdbuf == NULL) goto fini;

    // load it all in one fell swoop
    rdsz = read(fd, rdbuf, st.st_size);
    if (rdsz <= 0) goto fini;
    if (rdsz != st.st_size) { free(rdbuf); close(fd); return NULL; }
    rdbuf[rdsz]='\0';

    // strtok the result - each space-delimited address is assumed to be
    // a unique mercury address
    tok = strtok(rdbuf, "\r\n\t ");
    if (tok == NULL) goto fini;

    // build up the address buffer
    buf = malloc(addr_cap);
    if (buf == NULL) goto fini;
    do {
        int tok_sz = strlen(tok);
        if (tok_sz + addr_len + 1 > addr_cap) {
            void * tmp;
            addr_cap *= 2;
            tmp = realloc(buf, addr_cap);
            if (tmp == NULL) goto fini;
            buf = tmp;
        }
        memcpy((char*)buf + addr_len, tok, tok_sz+1);
        addr_len += tok_sz+1;
        num_addrs++;
        tok = strtok(NULL, "\r\n\t ");
    } while (tok != NULL);

    // set up the list of addresses
    addr_strs = malloc(num_addrs * sizeof(*addr_strs));
    if (addr_strs == NULL) goto fini;
    tok = (char*)buf;
    for (int i = 0; i < num_addrs; i++) {
        addr_strs[i] = tok;
        tok += strlen(tok) + 1;
    }

    // done parsing - setup the return structure
    s = malloc(sizeof(*s));
    if (s == NULL) goto fini;
Jonathan Jenkins's avatar
Jonathan Jenkins committed
139
    s->hgcl = NULL;
Jonathan Jenkins's avatar
Jonathan Jenkins committed
140 141
    s->addrs = malloc(num_addrs*sizeof(*s->addrs));
    if (s->addrs == NULL) goto fini;
Jonathan Jenkins's avatar
Jonathan Jenkins committed
142
    for (int i = 0; i < num_addrs; i++) s->addrs[i] = HG_ADDR_NULL;
Jonathan Jenkins's avatar
Jonathan Jenkins committed
143 144 145 146
    s->addr_strs = addr_strs; addr_strs = NULL;
    s->backing_buf = buf; buf = NULL;
    s->num_addrs = num_addrs;
    s->buf_size = addr_len;
147
    s->rank = is_member ? SSG_RANK_UNKNOWN : SSG_EXTERNAL_RANK;
Jonathan Jenkins's avatar
Jonathan Jenkins committed
148 149 150 151 152 153 154 155 156
#if HAVE_MARGO
    s->mid = MARGO_INSTANCE_NULL;
    s->barrier_rpc_id = 0;
    s->barrier_id = 0;
    s->barrier_count = 0;
    s->barrier_mutex = ABT_MUTEX_NULL;
    s->barrier_cond  = ABT_COND_NULL;
    s->barrier_eventual = ABT_EVENTUAL_NULL;
#endif
Jonathan Jenkins's avatar
Jonathan Jenkins committed
157 158 159 160 161 162

fini:
    if (fd != -1) close(fd);
    free(rdbuf);
    free(addr_strs);
    free(buf);
163
    if (s != NULL && s->addrs == NULL) { free(s); s = NULL; }
Jonathan Jenkins's avatar
Jonathan Jenkins committed
164 165 166 167
    return s;
}

#ifdef HAVE_MPI
Jonathan Jenkins's avatar
Jonathan Jenkins committed
168
ssg_t ssg_init_mpi(hg_class_t *hgcl, MPI_Comm comm)
Jonathan Jenkins's avatar
Jonathan Jenkins committed
169 170
{
    // my addr
Jonathan Jenkins's avatar
Jonathan Jenkins committed
171
    hg_addr_t self_addr = HG_ADDR_NULL;
Jonathan Jenkins's avatar
Jonathan Jenkins committed
172
    char * self_addr_str = NULL;
Jonathan Jenkins's avatar
Jonathan Jenkins committed
173
    hg_size_t self_addr_size = 0;
Jonathan Jenkins's avatar
Jonathan Jenkins committed
174 175 176 177 178 179 180 181 182
    int self_addr_size_int = 0; // for mpi-friendly conversion

    // collective helpers
    char * buf = NULL;
    int * sizes = NULL;
    int * sizes_psum = NULL;
    int comm_size = 0;
    int comm_rank = 0;

Jonathan Jenkins's avatar
Jonathan Jenkins committed
183 184
    // hg addresses
    hg_addr_t *addrs = NULL;
Jonathan Jenkins's avatar
Jonathan Jenkins committed
185 186 187 188 189 190

    // return data
    char **addr_strs = NULL;
    ssg_t s = NULL;

    // misc return codes
Jonathan Jenkins's avatar
Jonathan Jenkins committed
191
    hg_return_t hret;
Jonathan Jenkins's avatar
Jonathan Jenkins committed
192 193

    // get my address
Jonathan Jenkins's avatar
Jonathan Jenkins committed
194 195 196
    hret = HG_Addr_self(hgcl, &self_addr);
    if (hret != HG_SUCCESS) goto fini;
    hret = HG_Addr_to_string(hgcl, NULL, &self_addr_size, self_addr);
Jonathan Jenkins's avatar
Jonathan Jenkins committed
197 198 199
    if (self_addr == NULL) goto fini;
    self_addr_str = malloc(self_addr_size);
    if (self_addr_str == NULL) goto fini;
Jonathan Jenkins's avatar
Jonathan Jenkins committed
200 201
    hret = HG_Addr_to_string(hgcl, self_addr_str, &self_addr_size, self_addr);
    if (hret != HG_SUCCESS) goto fini;
Jonathan Jenkins's avatar
Jonathan Jenkins committed
202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232
    self_addr_size_int = (int)self_addr_size; // null char included in call

    // gather the buffer sizes
    MPI_Comm_size(comm, &comm_size);
    MPI_Comm_rank(comm, &comm_rank);
    sizes = malloc(comm_size * sizeof(*sizes));
    if (sizes == NULL) goto fini;
    sizes[comm_rank] = self_addr_size_int;
    MPI_Allgather(MPI_IN_PLACE, 0, MPI_BYTE, sizes, 1, MPI_INT, comm);

    // compute a exclusive prefix sum of the data sizes,
    // including the total at the end
    sizes_psum = malloc((comm_size+1) * sizeof(*sizes_psum));
    if (sizes_psum == NULL) goto fini;
    sizes_psum[0] = 0;
    for (int i = 1; i < comm_size+1; i++)
        sizes_psum[i] = sizes_psum[i-1] + sizes[i-1];

    // allgather the addresses
    buf = malloc(sizes_psum[comm_size]);
    if (buf == NULL) goto fini;
    MPI_Allgatherv(self_addr_str, self_addr_size_int, MPI_BYTE,
            buf, sizes, sizes_psum, MPI_BYTE, comm);

    // set the addresses
    addr_strs = setup_addr_str_list(comm_size, buf);
    if (addr_strs == NULL) goto fini;

    // init peer addresses
    addrs = malloc(comm_size*sizeof(*addrs));
    if (addrs == NULL) goto fini;
Jonathan Jenkins's avatar
Jonathan Jenkins committed
233
    for (int i = 0; i < comm_size; i++) addrs[i] = HG_ADDR_NULL;
Jonathan Jenkins's avatar
Jonathan Jenkins committed
234 235 236 237 238
    addrs[comm_rank] = self_addr;

    // set up the output
    s = malloc(sizeof(*s));
    if (s == NULL) goto fini;
Jonathan Jenkins's avatar
Jonathan Jenkins committed
239
    s->hgcl = NULL; // set in ssg_lookup
Jonathan Jenkins's avatar
Jonathan Jenkins committed
240 241 242 243 244 245
    s->addr_strs = addr_strs; addr_strs = NULL;
    s->addrs = addrs; addrs = NULL;
    s->backing_buf = buf; buf = NULL;
    s->num_addrs = comm_size;
    s->buf_size = sizes_psum[comm_size];
    s->rank = comm_rank;
Jonathan Jenkins's avatar
Jonathan Jenkins committed
246
    self_addr = HG_ADDR_NULL; // don't free this on success
Jonathan Jenkins's avatar
Jonathan Jenkins committed
247 248

fini:
Jonathan Jenkins's avatar
Jonathan Jenkins committed
249
    if (self_addr != HG_ADDR_NULL) HG_Addr_free(hgcl, self_addr);
Jonathan Jenkins's avatar
Jonathan Jenkins committed
250 251 252 253 254 255 256 257
    free(buf);
    free(sizes);
    free(addr_strs);
    free(addrs);
    return s;
}
#endif

258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311
hg_return_t ssg_resolve_rank(ssg_t s, hg_class_t *hgcl)
{
    if (s->rank == SSG_EXTERNAL_RANK ||
            s->rank != SSG_RANK_UNKNOWN)
        return HG_SUCCESS;

    // helpers
    hg_addr_t self_addr = HG_ADDR_NULL;
    char * self_addr_str = NULL;
    const char * self_addr_substr = NULL;
    hg_size_t self_addr_size = 0;
    const char * addr_substr = NULL;
    int rank = 0;
    hg_return_t hret;

    // get my address
    hret = HG_Addr_self(hgcl, &self_addr);
    if (hret != HG_SUCCESS) goto end;
    hret = HG_Addr_to_string(hgcl, NULL, &self_addr_size, self_addr);
    if (self_addr == NULL) { hret = HG_NOMEM_ERROR; goto end; }
    self_addr_str = malloc(self_addr_size);
    if (self_addr_str == NULL) { hret = HG_NOMEM_ERROR; goto end; }
    hret = HG_Addr_to_string(hgcl, self_addr_str, &self_addr_size, self_addr);
    if (hret != HG_SUCCESS) goto end;

    // strstr is used here b/c there may be inconsistencies in whether the class
    // is included in the address or not (it's not in HG_Addr_to_string, it
    // should be in ssg_init_config)
    self_addr_substr = strstr(self_addr_str, "://");
    if (self_addr_substr == NULL) { hret = HG_INVALID_PARAM; goto end; }
    self_addr_substr += 3;
    for (rank = 0; rank < s->num_addrs; rank++) {
        addr_substr = strstr(s->addr_strs[rank], "://");
        if (addr_substr == NULL) { hret = HG_INVALID_PARAM; goto end; }
        addr_substr+= 3;
        if (strcmp(self_addr_substr, addr_substr) == 0)
            break;
    }
    if (rank == s->num_addrs) {
        hret = HG_INVALID_PARAM;
        goto end;
    }

    // success - set
    s->rank = rank;
    s->addrs[rank] = self_addr; self_addr = HG_ADDR_NULL;

end:
    if (self_addr != HG_ADDR_NULL) HG_Addr_free(hgcl, self_addr);
    free(self_addr_str);

    return hret;
}

Jonathan Jenkins's avatar
Jonathan Jenkins committed
312 313 314 315 316 317 318
typedef struct ssg_lookup_out
{
    hg_return_t hret;
    hg_addr_t addr;
    int *cb_count;
} ssg_lookup_out_t;

319
hg_return_t ssg_lookup(ssg_t s, hg_context_t *hgctx)
Jonathan Jenkins's avatar
Jonathan Jenkins committed
320
{
Jonathan Jenkins's avatar
Jonathan Jenkins committed
321 322 323
    // set of outputs
    ssg_lookup_out_t *out = NULL;
    int cb_count = 0;
Jonathan Jenkins's avatar
Jonathan Jenkins committed
324 325 326
    // "effective" rank for the lookup loop
    int eff_rank = 0;

Jonathan Jenkins's avatar
Jonathan Jenkins committed
327 328 329
    // set the hg class up front - need for destructing addrs
    s->hgcl = HG_Context_get_class(hgctx);
    if (s->hgcl == NULL) return HG_INVALID_PARAM;
Jonathan Jenkins's avatar
Jonathan Jenkins committed
330 331 332

    // perform search for my rank if not already set
    if (s->rank == SSG_RANK_UNKNOWN) {
333
        hg_return_t hret = ssg_resolve_rank(s, s->hgcl);
Jonathan Jenkins's avatar
Jonathan Jenkins committed
334
        if (hret != HG_SUCCESS) return hret;
Jonathan Jenkins's avatar
Jonathan Jenkins committed
335 336 337 338 339
    }

    if (s->rank == SSG_EXTERNAL_RANK) {
        // do a completely arbitrary effective rank determination to try and
        // prevent everyone talking to the same member at once
Jonathan Jenkins's avatar
Jonathan Jenkins committed
340
        eff_rank = (((intptr_t)hgctx)/sizeof(hgctx)) % s->num_addrs;
Jonathan Jenkins's avatar
Jonathan Jenkins committed
341
    }
Jonathan Jenkins's avatar
Jonathan Jenkins committed
342
    else {
Jonathan Jenkins's avatar
Jonathan Jenkins committed
343
        eff_rank = s->rank;
Jonathan Jenkins's avatar
Jonathan Jenkins committed
344 345 346 347 348 349 350 351
        cb_count++;
    }

    // init addr metadata
    out = malloc(s->num_addrs * sizeof(*out));
    if (out == NULL) return HG_NOMEM_ERROR;
    // FIXME: lookups don't have a cancellation path, so in an intermediate
    // error we can't free the memory, lest we cause a segfault
Jonathan Jenkins's avatar
Jonathan Jenkins committed
352 353

    // rank is set, perform lookup
Jonathan Jenkins's avatar
Jonathan Jenkins committed
354 355 356 357 358 359 360
    hg_return_t hret;
    for (int i = (s->rank == SSG_EXTERNAL_RANK); i < s->num_addrs; i++) {
        int r = (eff_rank+i) % s->num_addrs;
        out[r].cb_count = &cb_count;
        hret = HG_Addr_lookup(hgctx, &ssg_lookup_cb, &out[r],
                s->addr_strs[r], HG_OP_ID_IGNORE);
        if (hret != HG_SUCCESS) return hret;
Jonathan Jenkins's avatar
Jonathan Jenkins committed
361
    }
Jonathan Jenkins's avatar
Jonathan Jenkins committed
362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384

    // lookups posted, enter the progress loop until finished
    do {
        unsigned int count = 0;
        do {
            hret = HG_Trigger(hgctx, 0, 1, &count);
        } while (hret == HG_SUCCESS && count > 0);
        if (hret != HG_SUCCESS && hret != HG_TIMEOUT) return hret;

        hret = HG_Progress(hgctx, 100);
    } while (cb_count < s->num_addrs &&
            (hret == HG_SUCCESS || hret == HG_TIMEOUT));

    if (hret != HG_SUCCESS && hret != HG_TIMEOUT)
        return hret;

    for (int i = 0; i < s->num_addrs; i++) {
        if (i != s->rank) {
            if (out[i].hret != HG_SUCCESS)
                return out[i].hret;
            else
                s->addrs[i] = out[i].addr;
        }
Jonathan Jenkins's avatar
Jonathan Jenkins committed
385 386
    }

Jonathan Jenkins's avatar
Jonathan Jenkins committed
387 388
    free(out);

Jonathan Jenkins's avatar
Jonathan Jenkins committed
389
    return HG_SUCCESS;
Jonathan Jenkins's avatar
Jonathan Jenkins committed
390 391
}

Jonathan Jenkins's avatar
Jonathan Jenkins committed
392
#ifdef HAVE_MARGO
393

Jonathan Jenkins's avatar
Jonathan Jenkins committed
394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423
// TODO: handle hash collision, misc errors
void ssg_register_barrier(ssg_t s, hg_class_t *hgcl)
{
    if (s->num_addrs == 1) return;

    s->barrier_rpc_id = fnv1a_64(s->backing_buf, s->buf_size);
    hg_return_t hret = HG_Register(hgcl, s->barrier_rpc_id,
            hg_proc_barrier_in_t, NULL, &proc_barrier_handler);
    assert(hret == HG_SUCCESS);
    hret = HG_Register_data(hgcl, s->barrier_rpc_id, s, NULL);
    assert(hret == HG_SUCCESS);

    int aret = ABT_mutex_create(&s->barrier_mutex);
    assert(aret == ABT_SUCCESS);
    aret = ABT_cond_create(&s->barrier_cond);
    assert(aret == ABT_SUCCESS);
    aret = ABT_eventual_create(0, &s->barrier_eventual);
    assert(aret == ABT_SUCCESS);
}

void ssg_set_margo_id(ssg_t s, margo_instance_id mid)
{
    s->mid = mid;
}

margo_instance_id ssg_get_margo_id(ssg_t s)
{
    return s->mid;
}

424 425 426 427 428 429 430 431 432 433 434 435
struct lookup_ult_args
{
    ssg_t ssg;
    margo_instance_id mid;
    int rank;
    hg_return_t out;
};

static void lookup_ult(void *arg)
{
    struct lookup_ult_args *l = arg;

Jonathan Jenkins's avatar
Jonathan Jenkins committed
436
    DEBUG("%d (ult): looking up rank %d\n", l->ssg->rank, l->rank);
437 438
    l->out = margo_addr_lookup(l->mid, l->ssg->addr_strs[l->rank],
            &l->ssg->addrs[l->rank]);
Jonathan Jenkins's avatar
Jonathan Jenkins committed
439
    DEBUG("%d (ult): looked up rank %d\n", l->ssg->rank, l->rank);
440 441
}

Jonathan Jenkins's avatar
Jonathan Jenkins committed
442
// TODO: refactor - code is mostly a copy of ssg_lookup
Jonathan Jenkins's avatar
Jonathan Jenkins committed
443
hg_return_t ssg_lookup_margo(ssg_t s)
Jonathan Jenkins's avatar
Jonathan Jenkins committed
444 445
{
    hg_context_t *hgctx;
446 447 448
    ABT_thread *ults;
    struct lookup_ult_args *args;
    hg_return_t hret = HG_SUCCESS;
Jonathan Jenkins's avatar
Jonathan Jenkins committed
449 450 451 452

    // "effective" rank for the lookup loop
    int eff_rank = 0;

Jonathan Jenkins's avatar
Jonathan Jenkins committed
453 454
    DEBUG("%d: entered lookup\n", s->rank);

Jonathan Jenkins's avatar
Jonathan Jenkins committed
455
    // set the hg class up front - need for destructing addrs
Jonathan Jenkins's avatar
Jonathan Jenkins committed
456
    hgctx = margo_get_context(s->mid);
Jonathan Jenkins's avatar
Jonathan Jenkins committed
457
    if (hgctx == NULL) return HG_INVALID_PARAM;
Jonathan Jenkins's avatar
Jonathan Jenkins committed
458
    s->hgcl = margo_get_class(s->mid);
Jonathan Jenkins's avatar
Jonathan Jenkins committed
459 460 461 462
    if (s->hgcl == NULL) return HG_INVALID_PARAM;

    // perform search for my rank if not already set
    if (s->rank == SSG_RANK_UNKNOWN) {
463
        hret = ssg_resolve_rank(s, s->hgcl);
Jonathan Jenkins's avatar
Jonathan Jenkins committed
464 465 466 467 468 469 470 471 472 473 474
        if (hret != HG_SUCCESS) return hret;
    }

    if (s->rank == SSG_EXTERNAL_RANK) {
        // do a completely arbitrary effective rank determination to try and
        // prevent everyone talking to the same member at once
        eff_rank = (((intptr_t)hgctx)/sizeof(hgctx)) % s->num_addrs;
    }
    else
        eff_rank = s->rank;

475 476 477 478 479 480 481 482 483 484 485
    // initialize ULTs
    ults = malloc(s->num_addrs * sizeof(*ults));
    if (ults == NULL) return HG_NOMEM_ERROR;
    args = malloc(s->num_addrs * sizeof(*args));
    if (args == NULL) {
        free(ults);
        return HG_NOMEM_ERROR;
    }
    for (int i = 0; i < s->num_addrs; i++)
        ults[i] = ABT_THREAD_NULL;

Jonathan Jenkins's avatar
Jonathan Jenkins committed
486 487 488 489 490 491 492 493 494 495 496
    DEBUG("%d: beginning thread create loop (%d...%d)\n", s->rank,
            (s->rank!=SSG_EXTERNAL_RANK), s->num_addrs);
    for (int i = (s->rank!=SSG_EXTERNAL_RANK); i < s->num_addrs; i++) {
        int r = (eff_rank+i) % s->num_addrs;
        args[r].ssg = s;
        args[r].mid = s->mid;
        args[r].rank = r;

        DEBUG("%d: lookup: create thread for rank %d\n", s->rank, r);
        int aret = ABT_thread_create(*margo_get_handler_pool(s->mid), &lookup_ult,
                &args[r], ABT_THREAD_ATTR_NULL, &ults[r]);
497 498 499 500
        if (aret != ABT_SUCCESS) {
            hret = HG_OTHER_ERROR;
            goto fin;
        }
Jonathan Jenkins's avatar
Jonathan Jenkins committed
501
    }
502

Jonathan Jenkins's avatar
Jonathan Jenkins committed
503 504 505 506 507 508 509 510
    // wait on all
    for (int i = (s->rank!=SSG_EXTERNAL_RANK); i < s->num_addrs; i++) {
        int r = (eff_rank+i) % s->num_addrs;
        DEBUG("%d: lookup: join thread for rank %d\n", s->rank, r);
        int aret = ABT_thread_join(ults[r]);
        DEBUG("%d: lookup: join thread for rank %d fin\n", s->rank, r);
        ABT_thread_free(&ults[r]);
        ults[r] = ABT_THREAD_NULL; // in case of cascading failure from join
511 512
        if (aret != ABT_SUCCESS) {
            hret = HG_OTHER_ERROR;
Jonathan Jenkins's avatar
Jonathan Jenkins committed
513
            break;
514
        }
Jonathan Jenkins's avatar
Jonathan Jenkins committed
515 516 517
        else if (args[r].out != HG_SUCCESS) {
            hret = args[r].out;
            break;
518 519 520 521 522 523 524 525
        }
    }

fin:
    // cleanup
    if (ults != NULL) {
        for (int i = 0; i < s->num_addrs; i++) {
            if (ults[i] != ABT_THREAD_NULL) {
Jonathan Jenkins's avatar
Jonathan Jenkins committed
526
                DEBUG("%d: lookup failed, cancelling ULT %d\n", s->rank, i);
527 528 529 530 531 532 533 534 535
                ABT_thread_cancel(ults[i]);
                ABT_thread_free(ults[i]);
            }
        }
        free(ults);
    }
    if (args != NULL) free(args);

    return hret;
Jonathan Jenkins's avatar
Jonathan Jenkins committed
536
}
Jonathan Jenkins's avatar
Jonathan Jenkins committed
537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650

// TODO: process errors in a sane manner
static void proc_barrier(void *arg)
{
    barrier_in_t in;
    hg_return_t hret;
    int aret;
    hg_handle_t h = arg;
    struct hg_info *info = HG_Get_info(h);
    ssg_t s = HG_Registered_data(info->hg_class, info->id);

    assert(s->rank == 0);

    hret = HG_Get_input(h, &in);
    assert(hret == HG_SUCCESS);

    DEBUG("%d: barrier ult: rx round %d from %d\n", s->rank, in.barrier_id,
            in.rank);
    // first wait until the nth barrier has been processed
    aret = ABT_mutex_lock(s->barrier_mutex);
    assert(aret == ABT_SUCCESS);
    while (s->barrier_id < in.barrier_id) {
        DEBUG("%d: barrier ult: waiting to enter round %d\n", s->rank,
                in.barrier_id);
        aret = ABT_cond_wait(s->barrier_cond, s->barrier_mutex);
        assert(aret == ABT_SUCCESS);
    }

    // inform all other ULTs waiting on this
    aret = ABT_cond_signal(s->barrier_cond);
    assert(aret == ABT_SUCCESS);
    // now wait until all barriers have been rx'd
    DEBUG("%d: barrier ult: out, incr count to %d\n", s->rank,
            s->barrier_count+1);
    s->barrier_count++;
    while (s->barrier_count < s->num_addrs-1) {
        DEBUG("%d: barrier ult: waiting (count at %d)\n", s->rank,
                s->barrier_count);
        aret = ABT_cond_wait(s->barrier_cond, s->barrier_mutex);
        assert(aret == ABT_SUCCESS);
    }
    DEBUG("%d: barrier ult: count compl, signal and respond\n", s->rank);
    // all barriers rx'd, inform other ULTs
    ABT_cond_signal(s->barrier_cond);
    ABT_mutex_unlock(s->barrier_mutex);

    hret = margo_respond(s->mid, h, NULL);
    assert(hret == HG_SUCCESS);
    HG_Destroy(h);

    DEBUG("%d: barrier ult: respond compl, count at %d\n", s->rank,
            s->barrier_count);

    aret = ABT_mutex_lock(s->barrier_mutex);
    assert(aret == ABT_SUCCESS);
    // done -> I'm the last ULT to enter, I do the eventual set
    int is_done = (++s->barrier_count) == 2*(s->num_addrs-1);
    if (is_done) s->barrier_count = 0;
    aret = ABT_mutex_unlock(s->barrier_mutex);
    assert(aret == ABT_SUCCESS);
    if (is_done) {
        aret = ABT_eventual_set(s->barrier_eventual, NULL, 0);
        assert(aret == ABT_SUCCESS);
    }
}

hg_return_t ssg_barrier_margo(ssg_t s)
{
    // non-members can't barrier
    if (s->rank < 0) return HG_INVALID_PARAM;

    // return immediately if a singleton group
    if (s->num_addrs == 1) return HG_SUCCESS;

    int aret = ABT_eventual_reset(s->barrier_eventual);
    if (aret != ABT_SUCCESS) return HG_OTHER_ERROR;

    DEBUG("%d: barrier: lock and incr id to %d\n", s->rank, s->barrier_id+1);
    int bid;
    // init the barrier state
    aret = ABT_mutex_lock(s->barrier_mutex);
    if (aret != ABT_SUCCESS) return HG_OTHER_ERROR;
    bid = ++s->barrier_id;
    aret = ABT_cond_broadcast(s->barrier_cond);
    if (aret != ABT_SUCCESS) {
        ABT_mutex_unlock(s->barrier_mutex); return HG_OTHER_ERROR;
    }
    aret = ABT_mutex_unlock(s->barrier_mutex);
    if (aret != ABT_SUCCESS) return HG_OTHER_ERROR;

    if (s->rank > 0) {
        DEBUG("%d: barrier: create and forward to 0\n", s->rank);
        barrier_in_t in;
        hg_handle_t h;
        hg_return_t hret = HG_Create(margo_get_context(s->mid),
                ssg_get_addr(s, 0), s->barrier_rpc_id, &h);
        if (hret != HG_SUCCESS) return hret;

        in.rank = s->rank;
        in.barrier_id = bid;
        hret = margo_forward(s->mid, h, &in);
        DEBUG("%d: barrier: finish\n", s->rank);
        HG_Destroy(h);
        if (hret != HG_SUCCESS) return hret;
    }
    else {
        DEBUG("%d: barrier: wait on eventual\n", s->rank);
        aret = ABT_eventual_wait(s->barrier_eventual, NULL);
        if (aret != ABT_SUCCESS) return HG_OTHER_ERROR;
    }

    return HG_SUCCESS;
}

Jonathan Jenkins's avatar
Jonathan Jenkins committed
651 652
#endif

Jonathan Jenkins's avatar
Jonathan Jenkins committed
653 654
void ssg_finalize(ssg_t s)
{
655 656
    if (s == SSG_NULL) return;

Jonathan Jenkins's avatar
Jonathan Jenkins committed
657 658 659 660 661 662 663 664
#ifdef HAVE_MARGO
    if (s->barrier_mutex != ABT_MUTEX_NULL)
        ABT_mutex_free(&s->barrier_mutex);
    if (s->barrier_cond != ABT_COND_NULL)
        ABT_cond_free(&s->barrier_cond);
    if (s->barrier_eventual != ABT_EVENTUAL_NULL)
        ABT_eventual_free(&s->barrier_eventual);
#endif
Jonathan Jenkins's avatar
Jonathan Jenkins committed
665
    for (int i = 0; i < s->num_addrs; i++) {
Jonathan Jenkins's avatar
Jonathan Jenkins committed
666
        if (s->addrs[i] != HG_ADDR_NULL) HG_Addr_free(s->hgcl, s->addrs[i]);
Jonathan Jenkins's avatar
Jonathan Jenkins committed
667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683
    }
    free(s->backing_buf);
    free(s->addr_strs);
    free(s->addrs);
    free(s);
}

int ssg_get_rank(const ssg_t s)
{
    return s->rank;
}

int ssg_get_count(const ssg_t s)
{
    return s->num_addrs;
}

Jonathan Jenkins's avatar
Jonathan Jenkins committed
684
hg_addr_t ssg_get_addr(const ssg_t s, int rank)
Jonathan Jenkins's avatar
Jonathan Jenkins committed
685
{
686
    if (rank >= 0 && rank < s->num_addrs)
Jonathan Jenkins's avatar
Jonathan Jenkins committed
687 688
        return s->addrs[rank];
    else
Jonathan Jenkins's avatar
Jonathan Jenkins committed
689
        return HG_ADDR_NULL;
Jonathan Jenkins's avatar
Jonathan Jenkins committed
690 691 692 693
}

const char * ssg_get_addr_str(const ssg_t s, int rank)
{
694
    if (rank >= 0 && rank < s->num_addrs)
Jonathan Jenkins's avatar
Jonathan Jenkins committed
695 696 697 698 699 700 701
        return s->addr_strs[rank];
    else
        return NULL;
}

// serialization format looks like:
// < num members, buffer size, buffer... >
Jonathan Jenkins's avatar
Jonathan Jenkins committed
702
// doesn't attempt to grab hg_addr's, string buffers, etc. - client will be
Jonathan Jenkins's avatar
Jonathan Jenkins committed
703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773
// responsible for doing a separate address lookup routine
hg_return_t hg_proc_ssg_t(hg_proc_t proc, ssg_t *s)
{
    // error and return handling
    hg_return_t hret = HG_SUCCESS;
    char * err_str = NULL;

    // input/output vars + helpers for ssg decode setup
    ssg_t ss = NULL;

    switch(hg_proc_get_op(proc)) {
        case HG_ENCODE:
            ss = *s;
            // encode address count
            hret = hg_proc_int32_t(proc, &ss->num_addrs);
            if (hret != HG_SUCCESS) { err_str = "ssg num addrs"; goto end; }
            // encode addr
            hret = hg_proc_int32_t(proc, &ss->buf_size);
            if (hret != HG_SUCCESS) { err_str = "ssg buf size"; goto end; }
            // encode addr string, simple as blitting the backing buffer
            hret = hg_proc_memcpy(proc, ss->backing_buf, ss->buf_size);
            if (hret != HG_SUCCESS) { err_str = "ssg addr buf"; goto end; }
            break;

        case HG_DECODE:
            // create the output
            *s = NULL;
            ss = malloc(sizeof(*ss));
            if (ss == NULL) {
                err_str = "ssg alloc";
                hret = HG_NOMEM_ERROR;
                goto end;
            }
            ss->addr_strs = NULL;
            ss->addrs = NULL;
            ss->backing_buf = NULL;
            // get address count
            hret = hg_proc_int32_t(proc, &ss->num_addrs);
            if (hret != HG_SUCCESS) { err_str = "ssg num addrs"; goto end; }
            // get number of bytes for the address
            hret = hg_proc_int32_t(proc, &ss->buf_size);
            if (hret != HG_SUCCESS) { err_str = "ssg buf size"; goto end; }
            // allocate output buffer
            ss->backing_buf = malloc(ss->buf_size);
            if (hret != HG_SUCCESS) {
                err_str = "ssg buf alloc";
                hret = HG_NOMEM_ERROR;
                goto end;
            }
            hret = hg_proc_memcpy(proc, ss->backing_buf, ss->buf_size);
            if (hret != HG_SUCCESS) { err_str = "ssg addr buf"; goto end; }

            // set the remaining ssg vars

            ss->addr_strs = NULL; ss->addrs = NULL;
            ss->rank = -1; // receivers aren't part of the group

            ss->addr_strs = setup_addr_str_list(ss->num_addrs, ss->backing_buf);
            if (ss->addr_strs == NULL) {
                err_str = "ssg addr strs alloc";
                hret = HG_NOMEM_ERROR;
                goto end;
            }

            ss->addrs = malloc(ss->num_addrs * sizeof(*ss->addrs));
            if (ss->addrs == NULL) {
                err_str = "ssg addrs alloc";
                hret = HG_NOMEM_ERROR;
                goto end;
            }
            for (int i = 0; i < ss->num_addrs; i++) {
Jonathan Jenkins's avatar
Jonathan Jenkins committed
774
                ss->addrs[i] = HG_ADDR_NULL;
Jonathan Jenkins's avatar
Jonathan Jenkins committed
775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804
            }

            // success: set the output
            *s = ss;
            break;

        case HG_FREE:
            if (s != NULL && *s != NULL) {
                err_str = "ssg shouldn't be freed via HG_Free_*";
                hret = HG_INVALID_PARAM;
            }
            goto end;

        default:
            err_str = "bad proc mode";
            hret = HG_INVALID_PARAM;
    }
end:
    if (err_str) {
        HG_LOG_ERROR("Proc error: %s", err_str);
        if (hg_proc_get_op(proc) == HG_DECODE) {
            free(ss->addr_strs);
            free(ss->addrs);
            free(ss->backing_buf);
            free(ss);
        }
    }
    return hret;
}

805 806 807 808 809 810 811 812 813 814 815 816 817 818
int ssg_dump(const ssg_t s, const char *fname)
{
    // file to write to
    int fd = -1;
    ssize_t written;

    // string to xform and dump
    char * addrs_dup = NULL;
    char * tok = NULL;
    char * addrs_dup_end = NULL;

    // return code
    int ret = 0;

819 820
    // copy the backing buffer, replacing all null chars with
    // newlines
821 822 823 824 825
    addrs_dup = malloc(s->buf_size);
    if (addrs_dup == NULL) { errno = ENOMEM; ret = -1; goto end; }
    memcpy(addrs_dup, s->backing_buf, s->buf_size);
    tok = addrs_dup;
    addrs_dup_end = addrs_dup + s->buf_size;
826
    for (int i = 0; i < s->num_addrs; i++) {
827 828 829 830 831 832
        tok = memchr(tok, '\0', addrs_dup_end - tok);
        if (tok == NULL) { errno = EINVAL; ret = -1; goto end; }
        *tok = '\n';
    }

    // open the file and dump in a single call
833
    fd = open(fname, O_WRONLY | O_CREAT | O_EXCL, 0644);
834 835
    if (fd == -1) { ret = -1; goto end; }
    // don't include the null char at the end
836 837
    written = write(fd, addrs_dup, s->buf_size);
    if (written != s->buf_size) ret = -1;
838 839 840 841 842 843 844 845

end:
    free(addrs_dup);
    if (fd != -1) close(fd);

    return ret;
}

Jonathan Jenkins's avatar
Jonathan Jenkins committed
846
static hg_return_t ssg_lookup_cb(const struct hg_cb_info *info)
Jonathan Jenkins's avatar
Jonathan Jenkins committed
847
{
Jonathan Jenkins's avatar
Jonathan Jenkins committed
848 849 850 851 852 853 854
    ssg_lookup_out_t *out = info->arg;
    *out->cb_count += 1;
    out->hret = info->ret;
    if (out->hret != HG_SUCCESS)
        out->addr = HG_ADDR_NULL;
    else
        out->addr = info->info.lookup.addr;
Jonathan Jenkins's avatar
Jonathan Jenkins committed
855
    return HG_SUCCESS;
Jonathan Jenkins's avatar
Jonathan Jenkins committed
856 857 858 859 860 861 862 863 864 865 866 867 868 869
}

static char** setup_addr_str_list(int num_addrs, char * buf)
{
    char ** ret = malloc(num_addrs * sizeof(*ret));
    if (ret == NULL) return NULL;

    ret[0] = buf;
    for (int i = 1; i < num_addrs; i++) {
        char * a = ret[i-1];
        ret[i] = a + strlen(a) + 1;
    }
    return ret;
}
Jonathan Jenkins's avatar
Jonathan Jenkins committed
870 871 872 873 874 875 876 877 878 879 880 881

static uint64_t fnv1a_64(void *data, size_t size)
{
    uint64_t hash = 14695981039346656037ul;
    unsigned char *d = data;

    for (size_t i = 0; i < size; i++) {
        hash ^= (uint64_t)*d++;
        hash *= 1099511628211;
    }
    return hash;
}