Dear all,
I was testing a program that would exhaust all my memory (in C++), and
when this would happen, it would call set_new_handler() along with one
of my functions that would inform the user about the lack of memory and
then it would exit the program. Instead, the program was force-killed by
the kernel (signal 9) and I was informed that:
"swap zone exhausted, increase kern.maxswzone"
on my main console. So far so good. In two other consoles I was running
top -P, and vmvstat 5, and their output was:
# top -P
last pid: 1776; load averages: 1.71, 0.72, 0.40 up 0+00:24:29
12:24:39
34 processes: 2 running, 32 sleeping
CPU 0: 2.6% user, 0.0% nice, 88.3% system, 0.0% interrupt, 9.0% idle
CPU 1: 0.0% user, 0.0% nice, 39.1% system, 0.0% interrupt, 60.9% idle
CPU 2: 0.0% user, 0.0% nice, 2.6% system, 1.5% interrupt, 95.9% idle
CPU 3: 0.4% user, 0.0% nice, 89.8% system, 0.0% interrupt, 9.8% idle
Mem: 2629M Active, 221M Inact, 966M Wired, 82M Cache, 7280K Buf, 16M Free
Swap: 4096M Total, 1821M Used, 2275M Free, 44% Inuse, 196K In, 30M Out
FreeBSD/amd64 (example.com) (ttyv2)ATE C TIME WCPU COMMAND
1771 mamalos 1 117 0 573G 3566M CPU1 1 1:48 94.38% memory
login: oot 1 44 0 11544K 1176K select 0 0:17 0.29%
hald-addon
1535 root 1 44 0 16552K 1436K swread 2 0:03 0.20%
hald-addon
1772 mamalos 1 44 0 9364K 2032K CPU3 0 0:02 0.00% top
790 root 1 46 0 8068K 812K select 3 0:01 0.00% moused
1514 root 1 44 0 21696K 1596K wait 0 0:00 0.00% login
1711 mamalos 1 45 0 10148K 0K wait 1 0:00 0.00% <bash>
1021 root 1 44 0 7044K 864K zio->i 2 0:00 0.00%
syslogd
829 root 1 64 0 3204K 16K select 2 0:00 0.00% devd
1568 root 1 47 0 10148K 964K ttyin 1 0:00 0.00% bash
1530 root 1 44 0 17872K 1108K swread 2 0:00 0.00%
hald-runne
1513 root 1 44 0 21696K 0K wait 0 0:00 0.00%
<login>
1680 mamalos 1 44 0 10148K 0K wait 3 0:00 0.00% <bash>
1512 root 1 44 0 21696K 0K wait 0 0:00 0.00%
<login>
1511 root 1 44 0 21696K 0K wait 0 0:00 0.00%
<login>
and:
# vmstat 5
procs memory page disks
faults cpu
r b w avm fre flt re pi po fr sr ad4 cd0 in sy
cs us sy id
1 0 9 565G 133M 1761 3 4 156 901 13078 0 0 173 1693
1581 0 7i 92
when the program was shut.
As you can see (in vmstat's output) avm equals to 565G of
memory(?!?!?!), and top shows that the first process (it's called
memory) has a size of 573G!
moreover, on another terminal I run:
# sysctl -a | grep -i swap
vm.swap_enabled: 1
vm.nswapdev: 1
vm.swap_async_max: 4
vm.swap_reserved: 544762376192
vm.swap_total: 4294967296
vm.swap_idle_threshold2: 10
vm.swap_idle_threshold1: 2
vm.stats.vm.v_swappgsout: 795224
vm.stats.vm.v_swappgsin: 1188
vm.stats.vm.v_swapout: 200045
vm.stats.vm.v_swapin: 606
vm.disable_swapspace_pageouts: 0
vm.defer_swapspace_pageouts: 0
vm.swap_idle_enabled: 0
where one can see that vm.swap_reserved is equal to 507G whereas the
total size (vm.swap_total) is 4G.(?!?!?)
As far as my system is concerned:
$ uname -a
FreeBSD example.com 8.1-STABLE FreeBSD 8.1-STABLE #1: Fri Nov 5
17:27:37 EET 2010 root@:/mnt/obj/mnt/src/sys/GENERIC amd64
and I use zfs on one of my filesystems. So:
$ cat /boot/loader.conf
zfs_load="YES"
vfs.zfs.prefetch_disable=0
nvidia_load="YES"
kern.maxfiles="35000"
kern.ipc.shmall="65536"
atapicam_load=YES
snd_hda_load=YES
I had noticed in the past that at some moments vmstat would show more
memory than what my total memory was, but never sooo much.
Is this a bug or am I missing something very fundamental?
Thank you all for your time in advance.
--
George Mamalakis
IT Officer
Electrical and Computer Engineer (Aristotle Un. of Thessaloniki),
MSc (Imperial College of London)
Department of Electrical and Computer Engineering
Faculty of Engineering
Aristotle University of Thessaloniki
phone number : +30 (2310) 994379
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