Date: Mon, 3 Nov 2014 06:40:57 +0300 From: rozhuk.im@gmail.com To: <freebsd-hackers@freebsd.org> Subject: pagedaemon + rtorrent = fail Message-ID: <5456f94c.247d700a.771d.ffff869e@mx.google.com>
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This is a multi-part message in MIME format. ------=_NextPart_000_0072_01CFF731.211E8460 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Problem described here: https://forums.freebsd.org/threads/heavy-use-rtorrent-ufs-issues.14503/ http://www.bsdportal.ru/viewtopic.php?f=9&t=25194 http://forum.lissyara.su/viewtopic.php?f=53&t=39944 Swap is off: vm.swap_enabled=0 and no swap devices. I wrote a small program to demonstrate the problem. The program creates a file size of 2*"RAM size", map() block size specified, records in each page by byte, unmap(), map() next block... Once a file is written to more "RAM size" OOM kills the program and random demons. In the TOP program does not consume more than the write_block size (32 mb) for recording. Check the parameters before the test run. ------=_NextPart_000_0072_01CFF731.211E8460 Content-Type: text/plain; name="testvm.c" Content-Transfer-Encoding: quoted-printable Content-Disposition: attachment; filename="testvm.c" =0A= /* rtorrent + FreeBSD pagedaemon prombel simulator=0A= * 2014 Rozhuk Ivan <rozhuk.im@gmail.com>=0A= *=0A= * compile-command: "clang -Wall -O2 -o testvm testvm.c"=0A= */=0A= =0A= =0A= #include <sys/cdefs.h>=0A= #include <sys/types.h>=0A= #include <sys/stat.h> // chmod, fchmod, umask=0A= #include <sys/uio.h> /* readv, preadv, writev, pwritev */=0A= #include <sys/mman.h> /* mmap, munmap */=0A= =0A= #include <errno.h>=0A= #include <fcntl.h> /* open, fcntl */=0A= #include <stdio.h> /* snprintf, fprintf */=0A= #include <string.h> /* bcopy, bzero, memcpy, memmove, memset, strnlen, = strerror... */=0A= #include <unistd.h> /* close, write, sysconf */=0A= #include <stdlib.h> /* malloc, exit */=0A= =0A= #define LOG_ERR(error, descr) \=0A= fprintf(stdout, "fn: %s, line: %i, error: %i - %s, %s\n", \=0A= __FUNCTION__, __LINE__, error, strerror(error), descr);=0A= =0A= int=0A= main(int argc, char *argv[]) {=0A= int error =3D 0, fd;=0A= const char *file_name =3D (const char *)"/testvn.tmp";=0A= off_t mb =3D (1024 * 1024); /* 1 megabyte. */=0A= off_t file_size =3D (10 * 1024 * mb); /* Set to x2 RAM size. */=0A= off_t write_size =3D (32 * mb); /* Write block size. */=0A= off_t i, j, page_size;=0A= uint8_t *mem;=0A= =0A= fd =3D open(file_name, (O_RDWR | O_CREAT), 0600);=0A= if (-1 =3D=3D fd) {=0A= error =3D errno;=0A= LOG_ERR(error, "open()");=0A= goto err_out;=0A= }=0A= if (0 !=3D flock(fd, LOCK_EX)) {=0A= error =3D errno;=0A= LOG_ERR(error, "flock()");=0A= goto err_out;=0A= }=0A= if (0 !=3D ftruncate(fd, file_size)) {=0A= error =3D errno;=0A= LOG_ERR(error, "ftruncate()");=0A= goto err_out;=0A= }=0A= =0A= page_size =3D sysconf(_SC_PAGE_SIZE);=0A= for (i =3D 0; i < (file_size / write_size); i ++) {=0A= mem =3D mmap(NULL, write_size, (PROT_READ | PROT_WRITE),=0A= (MAP_SHARED | MAP_NOCORE), fd, (i * write_size));=0A= if (MAP_FAILED =3D=3D mem) {=0A= error =3D errno;=0A= LOG_ERR(error, "mmap()");=0A= goto err_out;=0A= }=0A= for (j =3D 0; j < (write_size / page_size); j ++) {=0A= mem[(j * page_size)] =3D 1;=0A= }=0A= munmap(mem, file_size);=0A= }=0A= =0A= err_out:=0A= close(fd);=0A= //unlink(file_name); /* Delete file to free all mem. */=0A= =0A= return (error);=0A= }=0A= ------=_NextPart_000_0072_01CFF731.211E8460--
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