#!/bin/sh
# File-backed shared memory performance
# https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=222356
# For unlinked files, do not msync(2) or sync on inactivation.
# https://reviews.freebsd.org/D12411
# Original test scenario by: tijl@FreeBSD.org
# Fixed by r323768
. ../default.cfg
cat > /tmp/unlink.c <<EOF
#include <sys/mman.h>
#include <sys/time.h>
#include <err.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
int
main(void) {
struct timeval diff, start, stop;
size_t sz;
void *base;
uint64_t usec;
int fd;
sz = 128 * 1024 * 1024;
fd = open("nosync.data", O_RDWR | O_CREAT, 0600);
if (fd == -1)
err(1, "open");
if (unlink("nosync.data") == -1)
err(1, "unlink");
if (ftruncate(fd, sz) == -1)
err(1, "ftruncate");
base = mmap(NULL, sz, PROT_READ | PROT_WRITE,
MAP_SHARED | MAP_NOSYNC, fd, 0);
if (base == MAP_FAILED)
err(1, "mmap");
memset(base, '0', sz);
if (munmap(base, sz) == -1)
err(1, "unmap");
gettimeofday(&start, NULL);
close(fd);
gettimeofday(&stop, NULL);
timersub(&stop, &start, &diff);
usec = ((uint64_t)1000000 * diff.tv_sec + diff.tv_usec);
if (usec > 500000) {
fprintf(stdout, "%.3f seconds elapsed\n",
(double)usec / 1000000);
return (0); /* Ignore error for now */
} else
return(0);
}
EOF
mycc -o /tmp/unlink -Wall -Wextra -O2 -g /tmp/unlink.c || exit 1
rm /tmp/unlink.c
cd $RUNDIR
/tmp/unlink; s=$?
rm /tmp/unlink
exit $s
