Date: Tue, 10 Aug 1999 13:34:51 -0600 From: Charles Randall <crandall@matchlogic.com> To: Charlie ROOT <root@sani-c.vrn.ru>, freebsd-questions@FreeBSD.ORG Subject: RE: System hang when mmap() large files Message-ID: <64003B21ECCAD11185C500805F31EC0303786B03@houston.matchlogic.com>
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Are you running the machine out of swap? Looks like you mmap 10 new MB on
each iteration. What happens if you munmap() the region before the close()?
Charles
-----Original Message-----
From: Charlie ROOT [mailto:root@sani-c.vrn.ru]
Sent: Tuesday, August 10, 1999 1:53 AM
To: freebsd-questions@FreeBSD.ORG
Subject: System hang when mmap() large files
My FreeBSD 3.1-STABLE hangs when this small program running:
#include <sys/types.h>
#include <sys/mman.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
main()
{
int fd;
int i;
int len=1024*1024*10; /*ie 10Mbytes*/
caddr_t addr;
char ttt[80];
for (i=0;;i++)
{
sprintf (ttt,"%d",i);
fd=open(ttt,O_CREAT|O_RDWR,0666);
if (fd<0)
{
printf("open error %ld\n",errno);
exit(1);
}
lseek(fd,len-1,SEEK_SET);
write(fd,"",1);
addr=mmap(0,len,PROT_READ|PROT_WRITE,MAP_SHARED,fd,0);
if (addr==MAP_FAILED)
{
printf("mmap error %ld",errno);
exit(1);
}
close(fd);
memset(addr,'x',len);
}
}
uname -a on my machine shows:
FreeBSD oleg.sani-c.vrn.ru 3.1-STABLE FreeBSD 3.1-STABLE
#2: Fri Apr 23 13:31:08 MSD 1999
root@oleg.sani-c.vrn.ru:/usr/src/sys/compile/KERNEL-CURRENT i386
Is this a known bug ? I'm very sorry, but I can't cvsup now, so if this
bug has been fixed already, please don't beat me, OK ? ;-)
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