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