My Debian Linux 2.0 cannot use more than 460MB sawp :(
Below is a description of my problem.
I have Pentium II, 512 Mb RAM, Linux debian 2.0,
kernel 2.0.36
I need quite big swap, so I created 7 swap partitions
hda3,hda5,...,hda10, as seen below:
/dev/hda1 * 1 1 420 3175168+ 7 OS/2 HPFS
/dev/hda2 421 421 438 136080 6 DOS 16-bit >=32M
/dev/hda3 439 439 456 136080 82 Linux swap
/dev/hda4 457 457 556 756000 5 Extended
/dev/hda5 457 457 474 136048+ 82 Linux swap
/dev/hda6 475 475 492 136048+ 82 Linux swap
/dev/hda7 493 493 510 136048+ 82 Linux swap
/dev/hda8 511 511 528 136048+ 82 Linux swap
/dev/hda9 529 529 546 136048+ 82 Linux swap
/dev/hda10 547 547 556 75568+ 82 Linux swap
When the system is loading it prints that the 7 (seven)
sawp partitions are activating, and that's mean that I have
860Mb of swap.
Unfortunately when the mathematica3.0 is running,
after using ("consuming") all RAM memory it can only
use up to 460Mb of swap and then it prints message:
'out of memory' and exits the calculations
(stop running the calculation) but it does not crush,
the front end of it and its kernel can be used further.
It is normal ? How can be the total swap amount (860Mb) used?
Does anybody have some idea, where could be reason
for such behaviour of Mathematica, Linux and swap?
(fault in kernel, my configurations of Linux, in Mathematica,
in my hard disk swap?)
Here are some additional information
$ free
total used free shared buffers cached
Mem: 515772 57200 458572 32108 2444 32272
-/+ buffers/cache: 22484 493288
Swap: 860052 1300 858752
fstab:
# /etc/fstab: static file system information.
#
# <file system> <mount point> <type> <options> <dump> <pass>
/dev/hdc1 / ext2 defaults,errors=remount-ro 0 1
/dev/hda3 none swap sw 0 0
/dev/hda5 none swap sw 0 0
/dev/hda6 none swap sw 0 0
/dev/hda7 none swap sw 0 0
/dev/hda8 none swap sw 0 0
/dev/hda9 none swap sw 0 0
/dev/hda10 none swap sw 0 0
proc /proc proc defaults 0 0
I have tried to use kernel 2.1.126 but although I could compile
it I cannot get it working. I mean: Lilo cannot start,
appears: LIL- and I have to reset and use rescue disk.
However its configurations was the same as
for the kernel 2.0.36 which was compiled and is working successfully
but the out of memory problem remains.
ps aux prints:
USER PID %CPU %MEM SIZE RSS TTY STAT START TIME COMMAND
daemon 111 0.0 0.0 792 0 ? SW 11:42 0:00 (portmap)
daemon 134 0.0 0.0 848 20 ? S 11:42 0:00 (atd)
krupa 148 0.0 0.2 1964 1268 3 S 11:42 0:00 -bash
krupa 251 0.1 0.7 6100 3964 3 S 12:19 0:00 emacs swap1
math 146 0.0 0.1 1936 712 1 S 11:42 0:00 -bash
math 258 0.0 0.1 916 536 1 R 12:29 0:00 ps aux
root 1 0.1 0.0 768 96 ? S 11:42 0:03 init
root 2 0.0 0.0 0 0 ? SW 11:42 0:00 (kflushd)
root 3 0.4 0.0 0 0 ? SW< 11:42 0:12 (kswapd)
root 4 0.0 0.0 0 0 ? SW 11:42 0:00 (nfsiod)
root 5 0.0 0.0 0 0 ? SW 11:42 0:00 (nfsiod)
root 6 0.0 0.0 0 0 ? SW 11:42 0:00 (nfsiod)
root 7 0.0 0.0 0 0 ? SW 11:42 0:00 (nfsiod)
root 16 0.0 0.0 732 28 ? S 11:42 0:00 update
root 98 0.0 0.0 900 200 ? S 11:42 0:00 /sbin/syslogd
root 100 0.0 0.0 912 72 ? S 11:42 0:00 (klogd)
root 107 0.0 0.0 752 64 ? S 11:42 0:00 /sbin/kerneld
root 113 0.0 0.0 868 16 ? S 11:42 0:00 (inetd)
root 117 0.0 0.0 760 132 ? S 11:42
0:00 /usr/sbin/gpm -m /devroot 122 0.0 0.0 912 24 ? S
11:42 0:00 (lpd)
root 137 0.0 0.0 860 172 ? S 11:42 0:00 /usr/sbin/cron
root 147 0.0 0.2 1948 1248 2 S 11:42 0:00 -bash
root 149 0.0 0.0 844 44 4 S 11:42 0:00 (getty)
root 150 0.0 0.0 844 8 5 S 11:42 0:00 (getty)
root 151 0.0 0.0 844 12 6 S 11:42 0:00 (getty)
I have read the following articel:
http://www.linuxhq.com/doc20/memory-tuning.txt
I had the following
# cat /proc/sys/vm/freepages
1048 1572 2096
I put
# echo "4192 8384 16764" > /proc/sys/vm/freepages
and now have:
# cat /proc/sys/vm/freepages
4192 8384 16764
but it haven't helped.
Still after consuming almost all RAM and
about half of swap stops computing and prints message:
out of memory.
I am getting desperate, please help.
Please send the answer to '[EMAIL PROTECTED]'
because the mailing list is too busy to me so I could miss the answer.
Thanks in advance,
Jan Krupa
