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dnl -*- shell-script -*-
dnl
dnl Copyright (c) 2001-2002 The Trustees of Indiana University.
dnl All rights reserved.
dnl Copyright (c) 1998-2001 University of Notre Dame.
dnl All rights reserved.
dnl Copyright (c) 1994-1998 The Ohio State University.
dnl All rights reserved.
dnl
dnl This file is part of the LAM/MPI software package. For license
dnl information, see the LICENSE file in the top level directory of the
dnl LAM/MPI source distribution.
dnl
dnl $Id: lam_get_shmmax.m4,v 1.4 2002/10/09 20:55:12 brbarret Exp $
dnl
define(LAM_GET_SHMMAX,[
lam_shmpool=[$]$2
# Determine maximum shared segment size.
AC_TRY_RUN([
#include <stddef.h>
#include <stdio.h>
#include <sys/ipc.h>
#include <sys/shm.h>
#define LAM_SHMSHORT $1
#define LAM_SHMPOOL $lam_shmpool
#define MB (1024*1024)
int
test_alloc(int size)
{
char *base;
int shmid;
shmid = shmget(IPC_PRIVATE, size, 0600 | IPC_CREAT);
if (shmid < 0) return(0);
base = (char *) shmat(shmid, (char *) 0, 0);
if (base == (char *) -1) {
shmctl(shmid, IPC_RMID, (struct shmid_ds *) 0);
return(0);
}
shmdt(base);
shmctl(shmid, IPC_RMID, (struct shmid_ds *) 0);
return(1);
}
int
main(int argc, char* argv[])
{
int poolsize, maxalloc;
FILE *f=fopen("conftestval", "w");
if (!f) return 1;
if (LAM_SHMPOOL > 0) {
if (LAM_SHMPOOL >= 2 * MB) maxalloc = MB;
else maxalloc = LAM_SHMPOOL;
fprintf(f, "%d\t%d\t%d\n", 0, LAM_SHMPOOL, maxalloc);
fclose(f);
return(0);
}
if (test_alloc(32*MB)) { poolsize = 16*MB; maxalloc = MB; }
else if (test_alloc(16*MB)) { poolsize = 14*MB; maxalloc = MB; }
else if (test_alloc(8*MB)) { poolsize = 6*MB; maxalloc = MB; }
else if (test_alloc(4*MB)) { poolsize = 2*MB; maxalloc = MB; }
else if (test_alloc(2*MB)) { poolsize = MB; maxalloc = MB/2; }
else if (test_alloc(MB)) {
poolsize = MB - (8*7 * (LAM_SHMSHORT+128)) - 256;
if (poolsize < 0) poolsize = MB - (4*3 * (LAM_SHMSHORT+128)) - 256;
if (poolsize < 0) poolsize = 0;
maxalloc = poolsize; }
else { poolsize = 0; maxalloc = 0; }
fprintf(f, "%d\t%d\n", poolsize, maxalloc);
fclose(f);
return(0);
}], [HAPPY=1], [HAPPY=0], [HAPPY=0])
if test "$HAPPY" = "1"; then
if test [$]$2 -eq 0; then
$2=`cat conftestval | cut -f1`
fi
if test [$]$3 -eq 0; then
$3=`cat conftestval | cut -f2`
fi
else
AC_MSG_WARN(error compiling/running conftest)
echo "using default of"
if test [$]$2 -eq 0; then
$2=524288
fi
if test [$]$3 -eq 0; then
$3=524288
fi
fi
unset HAPPY lam_shpool
/bin/rm -f conftest*])dnl
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