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select_c.sc
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select_c.sc
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/* tab:8
*
* select_c.sc - Parallel Selection Algorithm
*
*
* "Copyright (c) 1996 The Regents of the University of Maryland.
* All rights reserved.
*
* Permission to use, copy, modify, and distribute this software and its
* documentation for any purpose, without fee, and without written agreement is
* hereby granted, provided that the above copyright notice and the following
* two paragraphs appear in all copies of this software.
*
* IN NO EVENT SHALL THE UNIVERSITY OF MARYLAND BE LIABLE TO ANY PARTY FOR
* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT
* OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE UNIVERSITY OF
* MARYLAND HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* THE UNIVERSITY OF MARYLAND SPECIFICALLY DISCLAIMS ANY WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
* ON AN "AS IS" BASIS, AND THE UNIVERSITY OF MARYLAND HAS NO OBLIGATION TO
* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS."
*
* Authors: David A. Bader <dbader@umiacs.umd.edu>
* Joseph F. Ja'Ja' <joseph@umiacs.umd.edu>
* Institute for Advanced Computer Studies
* Department of Electrical Engineering
* AV Williams Building
* College Park, MD 20742
*
* Version: 1.0
* Creation Date: February 6, 1996
* Filename: select_c.sc
* History:
*/
#include "select_c.h"
#include "select_b.h"
#include "select_seq.h"
static int THRESH_SEL;
#define THRESH_SEL_INIT (PROCS*PROCS)
static int SELECT_MIN_MAX;
#define SELECT_MIN_MAX_INIT (PROCS)
/* NOTE:
* You must call all_select_c_init() before a call to all_select_c...()
*/
#define PROFILE_DETAILED 0
#define PROFILE_GENERAL 1
#if PROFILE_GENERAL
static double time_select, time_lb;
#endif
int all_select_c_i(int M, int *spread A,
int *spread N, int total_n, int i) {
#define DATA_TYPE int
int j, k,
t,
*locN;
DATA_TYPE
meds[PROCS],
mom,
result,
*seqval,
*locA;
#if PROFILE_DETAILED
double secs;
#endif
#if PROFILE_GENERAL
double secs_gen;
#endif
barrier();
#if PROFILE_DETAILED
barrier();
on_one {
fprintf(outfile,"PE %2d: all_select_c: total_n: %d i: %d\n",
MYPROC, total_n, i);
fflush(outfile);
}
barrier();
#endif
if (total_n < THRESH_SEL) {
#if PROFILE_DETAILED
barrier();
secs = get_seconds();
#endif
#if PROFILE_GENERAL
barrier();
secs_gen = get_seconds();
#endif
locN = (int*) malloc(PROCS * sizeof(int));
assert_malloc(locN);
locN[0] = *(N+MYPROC);
all_gather(locN);
on_one {
seqval = (DATA_TYPE*)malloc(total_n*sizeof(DATA_TYPE));
assert_malloc(seqval);
t = 0;
for (j=0; j<PROCS ; j++) {
bulk_get(seqval+t, (DATA_TYPE *global)(A+j),
locN[j]*sizeof(DATA_TYPE));
t += locN[j];
}
#if 1
if (t != total_n)
fprintf(stderr,"ERROR: t != total_n\n");
#endif
sync();
result = select_mom_i(seqval, t, i);
free(seqval);
}
#if PROFILE_GENERAL
barrier();
secs_gen = get_seconds() - secs_gen;
time_select += secs_gen;
barrier();
#endif
#if PROFILE_DETAILED
barrier();
secs = get_seconds() - secs;
on_one {
fprintf(outfile,"Seq2 n: %12d ",total_n);
fprintf(outfile,"Time for Seq2: %9.6f\n",secs);
}
barrier();
#endif
result = all_bcast(result);
free(locN);
}
else {
#if PROFILE_DETAILED
barrier();
secs = get_seconds();
#endif
#if PROFILE_GENERAL
barrier();
secs_gen = get_seconds();
#endif
all_LoadBalance_b_i(M, A, N, total_n);
#if PROFILE_GENERAL
barrier();
secs_gen = get_seconds() - secs_gen;
time_lb += secs_gen;
barrier();
#endif
#if PROFILE_DETAILED
barrier();
secs = get_seconds() - secs;
on_one {
fprintf(outfile,"LB2 n: %12d ",total_n);
fprintf(outfile,"Time for LB2: %9.6f\n",secs);
}
barrier();
#endif
#if PROFILE_DETAILED
barrier();
secs = get_seconds();
#endif
#if PROFILE_GENERAL
barrier();
secs_gen = get_seconds();
#endif
locN = (int *)(N+MYPROC);
locA = (DATA_TYPE *)(A+MYPROC);
*meds = select_mom_i(locA, *locN, *locN >> 1);
all_gather(meds);
on_one mom = select_mom_i(meds, PROCS, PROCS>>1);
mom = all_bcast(mom);
k = partition_unk_piv_i(locA, *locN, mom);
t = all_reduce_to_all_add(k);
if (t==total_n) {
result = mom;
#if PROFILE_GENERAL
barrier();
secs_gen = get_seconds() - secs_gen;
time_select += secs_gen;
barrier();
#endif
#if PROFILE_DETAILED
barrier();
secs = get_seconds() - secs;
on_one {
fprintf(outfile,"Sel2 n: %12d ",total_n);
fprintf(outfile,"Time for Sel2: %9.6f\n",secs);
}
barrier();
#endif
}
else {
if (i <= t) {
total_n = t;
*locN = k;
}
else {
total_n -= t;
i -= t;
*locN -= k;
bcopy(locA+k, locA, (*locN)*sizeof(DATA_TYPE));
}
#if PROFILE_GENERAL
barrier();
secs_gen = get_seconds() - secs_gen;
time_select += secs_gen;
barrier();
#endif
#if PROFILE_DETAILED
barrier();
secs = get_seconds() - secs;
on_one {
fprintf(outfile,"Sel2 n: %12d ",total_n);
fprintf(outfile,"Time for Sel2: %9.6f\n",secs);
}
barrier();
#endif
result = all_select_c_i(M, A, N, total_n, i);
}
}
#if PROFILE_GENERAL
#endif
return (result);
#undef DATA_TYPE
}
double all_select_c_d(int M, double *spread A,
int *spread N, int total_n, int i) {
#define DATA_TYPE double
int j, k,
t,
*locN;
DATA_TYPE
meds[PROCS],
mom,
result,
*seqval,
*locA;
#if PROFILE_DETAILED
double secs;
#endif
#if PROFILE_GENERAL
double secs_gen;
#endif
barrier();
#if PROFILE_DETAILED
barrier();
on_one {
fprintf(outfile,"PE %2d: all_select_c: total_n: %d i: %d\n",
MYPROC, total_n, i);
fflush(outfile);
}
barrier();
#endif
if (total_n <= THRESH_SEL) {
#if PROFILE_DETAILED
barrier();
secs = get_seconds();
#endif
#if PROFILE_GENERAL
barrier();
secs_gen = get_seconds();
#endif
locN = (int*) malloc(PROCS * sizeof(int));
assert_malloc(locN);
locN[0] = *(N+MYPROC);
all_gather(locN);
on_one {
seqval = (DATA_TYPE*)malloc(total_n*sizeof(DATA_TYPE));
assert_malloc(seqval);
t = 0;
for (j=0; j<PROCS ; j++) {
bulk_get(seqval+t, (DATA_TYPE *global)(A+j),
locN[j]*sizeof(DATA_TYPE));
t += locN[j];
}
#if 1
if (t != total_n)
fprintf(stderr,"ERROR: t != total_n\n");
#endif
sync();
result = select_mom_d(seqval, t, i);
free(seqval);
}
#if PROFILE_GENERAL
barrier();
secs_gen = get_seconds() - secs_gen;
time_select += secs_gen;
barrier();
#endif
#if PROFILE_DETAILED
barrier();
secs = get_seconds() - secs;
on_one {
fprintf(outfile,"Seq2 n: %12d ",total_n);
fprintf(outfile,"Time for Seq2: %9.6f\n",secs);
}
barrier();
#endif
result = all_bcast_d(result);
free(locN);
}
else {
#if PROFILE_DETAILED
barrier();
secs = get_seconds();
#endif
#if PROFILE_GENERAL
barrier();
secs_gen = get_seconds();
#endif
all_LoadBalance_b_d(M, A, N, total_n);
#if PROFILE_GENERAL
barrier();
secs_gen = get_seconds() - secs_gen;
time_lb += secs_gen;
barrier();
#endif
#if PROFILE_DETAILED
barrier();
secs = get_seconds() - secs;
on_one {
fprintf(outfile,"LB2 n: %12d ",total_n);
fprintf(outfile,"Time for LB2: %9.6f\n",secs);
}
barrier();
#endif
#if PROFILE_DETAILED
barrier();
secs = get_seconds();
#endif
#if PROFILE_GENERAL
barrier();
secs_gen = get_seconds();
#endif
locN = (int *)(N+MYPROC);
locA = (DATA_TYPE *)(A+MYPROC);
*meds = select_mom_d(locA, *locN, *locN >> 1);
all_gather_d(meds);
on_one mom = select_mom_d(meds, PROCS, PROCS>>1);
mom = all_bcast_d(mom);
k = partition_unk_piv_d(locA, *locN, mom);
t = all_reduce_to_all_add(k);
if (t==total_n) {
result = mom;
#if PROFILE_GENERAL
barrier();
secs_gen = get_seconds() - secs_gen;
time_select += secs_gen;
barrier();
#endif
#if PROFILE_DETAILED
barrier();
secs = get_seconds() - secs;
on_one {
fprintf(outfile,"Sel2 n: %12d ",total_n);
fprintf(outfile,"Time for Sel2: %9.6f\n",secs);
}
barrier();
#endif
}
else {
if (i <= t) {
total_n = t;
*locN = k;
}
else {
total_n -= t;
i -= t;
*locN -= k;
bcopy(locA+k, locA, (*locN)*sizeof(DATA_TYPE));
}
#if PROFILE_GENERAL
barrier();
secs_gen = get_seconds() - secs_gen;
time_select += secs_gen;
barrier();
#endif
#if PROFILE_DETAILED
barrier();
secs = get_seconds() - secs;
on_one {
fprintf(outfile,"Sel2 n: %12d ",total_n);
fprintf(outfile,"Time for Sel2: %9.6f\n",secs);
}
barrier();
#endif
result = all_select_c_d(M, A, N, total_n, i);
}
}
#if PROFILE_GENERAL
#endif
return (result);
#undef DATA_TYPE
}
int all_select_c_alloc_i_orig(int M, int *spread A,
int *spread N, int total_n, int i,
int *sublist) {
#define DATA_TYPE int
int j, k,
t,
*locN;
DATA_TYPE
meds[PROCS],
mom,
result,
*seqval,
*locA;
#if PROFILE_DETAILED
double secs;
#endif
#if PROFILE_GENERAL
double secs_gen;
#endif
barrier();
#if PROFILE_DETAILED
barrier();
on_one {
fprintf(outfile,"PE %2d: all_select_c: total_n: %d i: %d\n",
MYPROC, total_n, i);
fflush(outfile);
}
barrier();
#endif
if (total_n < THRESH_SEL) {
#if PROFILE_DETAILED
barrier();
secs = get_seconds();
#endif
#if PROFILE_GENERAL
barrier();
secs_gen = get_seconds();
#endif
locN = (int*) malloc(PROCS * sizeof(int));
assert_malloc(locN);
locN[0] = *(N+MYPROC);
all_gather(locN);
on_one {
seqval = (DATA_TYPE*)malloc(total_n*sizeof(DATA_TYPE));
assert_malloc(seqval);
t = 0;
for (j=0; j<PROCS ; j++) {
bulk_get(seqval+t, (DATA_TYPE *global)(A+j),
locN[j]*sizeof(DATA_TYPE));
t += locN[j];
}
#if 1
if (t != total_n)
fprintf(stderr,"ERROR: t != total_n\n");
#endif
sync();
result = select_mom_alloc_i(seqval, t, i,sublist);
free(seqval);
}
#if PROFILE_GENERAL
barrier();
secs_gen = get_seconds() - secs_gen;
time_select += secs_gen;
barrier();
#endif
#if PROFILE_DETAILED
barrier();
secs = get_seconds() - secs;
on_one {
fprintf(outfile,"Seq2 n: %12d ",total_n);
fprintf(outfile,"Time for Seq2: %9.6f\n",secs);
}
barrier();
#endif
result = all_bcast(result);
free(locN);
}
else {
#if PROFILE_DETAILED
barrier();
secs = get_seconds();
#endif
#if PROFILE_GENERAL
barrier();
secs_gen = get_seconds();
#endif
all_LoadBalance_b_i(M, A, N, total_n);
#if PROFILE_GENERAL
barrier();
secs_gen = get_seconds() - secs_gen;
time_lb += secs_gen;
barrier();
#endif
#if PROFILE_DETAILED
barrier();
secs = get_seconds() - secs;
on_one {
fprintf(outfile,"LB2 n: %12d ",total_n);
fprintf(outfile,"Time for LB2: %9.6f\n",secs);
}
barrier();
#endif
#if PROFILE_DETAILED
barrier();
secs = get_seconds();
#endif
#if PROFILE_GENERAL
barrier();
secs_gen = get_seconds();
#endif
locN = (int *)(N+MYPROC);
locA = (DATA_TYPE *)(A+MYPROC);
*meds = select_mom_alloc_i(locA, *locN, *locN >> 1, sublist);
all_gather(meds);
on_one mom = select_mom_alloc_i(meds, PROCS, PROCS>>1,sublist);
mom = all_bcast(mom);
k = partition_unk_piv_i(locA, *locN, mom);
t = all_reduce_to_all_add(k);
if (t==total_n) {
result = mom;
#if PROFILE_GENERAL
barrier();
secs_gen = get_seconds() - secs_gen;
time_select += secs_gen;
barrier();
#endif
#if PROFILE_DETAILED
barrier();
secs = get_seconds() - secs;
on_one {
fprintf(outfile,"Sel2 n: %12d ",total_n);
fprintf(outfile,"Time for Sel2: %9.6f\n",secs);
}
barrier();
#endif
}
else {
if (i <= t) {
total_n = t;
*locN = k;
}
else {
total_n -= t;
i -= t;
*locN -= k;
bcopy(locA+k, locA, (*locN)*sizeof(DATA_TYPE));
}
#if PROFILE_GENERAL
barrier();
secs_gen = get_seconds() - secs_gen;
time_select += secs_gen;
barrier();
#endif
#if PROFILE_DETAILED
barrier();
secs = get_seconds() - secs;
on_one {
fprintf(outfile,"Sel2 n: %12d ",total_n);
fprintf(outfile,"Time for Sel2: %9.6f\n",secs);
}
barrier();
#endif
result = all_select_c_alloc_i(M, A, N, total_n, i,sublist);
}
}
return (result);
#undef DATA_TYPE
}
int all_select_min_alloc_i(int M, int *spread A,
int *spread N, int total_n, int i,
int *sublist, int X) {
#define DATA_TYPE int
int
j, t;
DATA_TYPE
piv,
result,
*locA,
*seqval;
locA = (DATA_TYPE *)(A+MYPROC);
t = *(N+MYPROC);
if (i==1) {
result = locA[0];
for (j=1 ; j<t ; j++)
result = min(result,locA[j]);
result = all_reduce_to_all_min(result);
}
else{
piv = select_mom_alloc_i(locA, t, i, sublist);
j = partition_i(locA, t, piv);
barrier();
on_one {
seqval = (DATA_TYPE*)malloc(total_n*sizeof(DATA_TYPE));
assert_malloc(seqval);
t = 0;
for (j=0; j<PROCS ; j++) {
bulk_get(seqval+t, (DATA_TYPE *global)(A+j),
X*sizeof(DATA_TYPE));
t += X;
}
sync();
result = select_mom_alloc_i(seqval, t, i,sublist);
free(seqval);
}
result = all_bcast(result);
}
return (result);
}
int all_select_max_alloc_i(int M, int *spread A,
int *spread N, int total_n, int i,
int *sublist, int X) {
#define DATA_TYPE int
int
j, t,
offset,
last;
DATA_TYPE
piv,
result,
*locA,
*seqval;
locA = (DATA_TYPE *)(A+MYPROC);
t = *(N+MYPROC);
if (i==total_n) {
result = locA[0];
for (j=1 ; j<t ; j++)
result = max(result,locA[j]);
result = all_reduce_to_all_max(result);
}
else {
piv = select_mom_alloc_i(locA, t, i, sublist);
j = partition_i(locA, t, piv);
barrier();
on_one {
seqval = (DATA_TYPE*)malloc(total_n*sizeof(DATA_TYPE));
assert_malloc(seqval);
offset = M - X;
t = 0;
for (j=0; j<PROCS-1 ; j++) {
bulk_get(seqval+t,
(DATA_TYPE *global)(A+j) + offset,
X*sizeof(DATA_TYPE));
t += X;
}
offset = *(N+(PROCS-1)) - X;
bulk_get(seqval+t,
(DATA_TYPE *global)(A+(PROCS-1)) + offset,
X*sizeof(DATA_TYPE));
t += X;
sync();
j = i - (total_n - X*PROCS);
result = select_mom_alloc_i(seqval, t, j,sublist);
free(seqval);
}
result = all_bcast(result);
}
return (result);
#undef DATA_TYPE
}
double all_select_min_alloc_d(int M, double *spread A,
int *spread N, int total_n, int i,
double *sublist, int X) {
#define DATA_TYPE double
int
j, t;
DATA_TYPE
piv,
result,
*locA,
*seqval;
locA = (DATA_TYPE *)(A+MYPROC);
t = *(N+MYPROC);
if (i==1) {
result = locA[0];
for (j=1 ; j<t ; j++)
result = min(result,locA[j]);
result = all_reduce_to_all_dmin(result);
}
else {
piv = select_mom_alloc_d(locA, t, i, sublist);
j = partition_d(locA, t, piv);
barrier();
on_one {
seqval = (DATA_TYPE*)malloc(total_n*sizeof(DATA_TYPE));
assert_malloc(seqval);
t = 0;
for (j=0; j<PROCS ; j++) {
bulk_get(seqval+t, (DATA_TYPE *global)(A+j),
X*sizeof(DATA_TYPE));
t += X;
}
sync();
result = select_mom_alloc_d(seqval, t, i,sublist);
free(seqval);
}
result = all_bcast_d(result);
}
return (result);
#undef DATA_TYPE
}
double all_select_max_alloc_d(int M, double *spread A,
int *spread N, int total_n, int i,
double *sublist, int X) {
#define DATA_TYPE double
int
j, t,
offset,
last;
DATA_TYPE
piv,
result,
*locA,
*seqval;
locA = (DATA_TYPE *)(A+MYPROC);
t = *(N+MYPROC);
if (i==total_n) {
result = locA[0];
for (j=1 ; j<t ; j++)
result = max(result,locA[j]);
result = all_reduce_to_all_dmax(result);
}
else {
piv = select_mom_alloc_d(locA, t, i, sublist);
j = partition_d(locA, t, piv);
barrier();
on_one {
seqval = (DATA_TYPE*)malloc(total_n*sizeof(DATA_TYPE));
assert_malloc(seqval);
offset = M - X;
t = 0;
for (j=0; j<PROCS-1 ; j++) {
bulk_get(seqval+t,
(DATA_TYPE *global)(A+j) + offset,
X*sizeof(DATA_TYPE));
t += X;
}
offset = *(N+(PROCS-1)) - X;
bulk_get(seqval+t,
(DATA_TYPE *global)(A+(PROCS-1)) + offset,
X*sizeof(DATA_TYPE));
t += X;
sync();
j = i - (total_n - X*PROCS);
result = select_mom_alloc_d(seqval, t, j,sublist);
free(seqval);
}
result = all_bcast_d(result);
}
return (result);
#undef DATA_TYPE
}
int all_select_c_alloc_i(int M, int *spread A,
int *spread N, int total_n, int i,
int *sublist) {
#define DATA_TYPE int
int j, k,
t,
*locN;
DATA_TYPE
meds[PROCS],
mom,
result,
*seqval,
*locA;
#if PROFILE_DETAILED
double secs;
#endif
#if PROFILE_GENERAL
double secs_gen;
#endif
barrier();
#if PROFILE_DETAILED
barrier();
on_one {
fprintf(outfile,"PE %2d: all_select_c: total_n: %d i: %d\n",
MYPROC, total_n, i);
fflush(outfile);
}
barrier();
#endif
if (total_n < THRESH_SEL) {
#if PROFILE_DETAILED
barrier();
secs = get_seconds();
#endif
#if PROFILE_GENERAL
barrier();
secs_gen = get_seconds();
#endif
locN = (int*) malloc(PROCS * sizeof(int));
assert_malloc(locN);
locN[0] = *(N+MYPROC);
all_gather(locN);
on_one {
seqval = (DATA_TYPE*)malloc(total_n*sizeof(DATA_TYPE));
assert_malloc(seqval);
t = 0;
for (j=0; j<PROCS ; j++) {
bulk_get(seqval+t, (DATA_TYPE *global)(A+j),
locN[j]*sizeof(DATA_TYPE));
t += locN[j];
}
#if 1
if (t != total_n)
fprintf(stderr,"ERROR: t != total_n\n");
#endif
sync();
result = select_mom_alloc_i(seqval, t, i,sublist);
free(seqval);
}
#if PROFILE_GENERAL
barrier();
secs_gen = get_seconds() - secs_gen;
time_select += secs_gen;
barrier();
#endif
#if PROFILE_DETAILED
barrier();
secs = get_seconds() - secs;
on_one {
fprintf(outfile,"Seq2 n: %12d ",total_n);
fprintf(outfile,"Time for Seq2: %9.6f\n",secs);
}
barrier();
#endif
result = all_bcast(result);
free(locN);
}
else {
#if PROFILE_DETAILED
barrier();
secs = get_seconds();
#endif
#if PROFILE_GENERAL
barrier();
secs_gen = get_seconds();
#endif
all_LoadBalance_b_i(M, A, N, total_n);
#if PROFILE_GENERAL
barrier();
secs_gen = get_seconds() - secs_gen;
time_lb += secs_gen;
barrier();
#endif
#if PROFILE_DETAILED
barrier();
secs = get_seconds() - secs;
on_one {
fprintf(outfile,"LB2 n: %12d ",total_n);
fprintf(outfile,"Time for LB2: %9.6f\n",secs);
}
barrier();
#endif
if (i <= SELECT_MIN_MAX) {
#if PROFILE_DETAILED
barrier();
secs = get_seconds();
#endif
#if PROFILE_GENERAL
barrier();
secs_gen = get_seconds();
#endif
result = all_select_min_alloc_i(M, A, N, total_n, i,
sublist, SELECT_MIN_MAX);