Running Ubuntu 12.04.3 LTS with 32 cores 244GB. Its the Amazon EC2 memory instance the big one and Java 1.7u25
My java process is running with -Xmx226g
I'm trying to create a really large local cache using CQEngine and so far its blazingly fast with 30,000,000 records. Of course I will add an eviction policy that will allow garbage collection to clean up old objects evicted, but really trying to push the limits here :)
When looking at jvisualvm, the total heap is at about 180GB which dies 40GB to soon. I should be able to squeeze out a bit more.
Not that I don't want the kernel to kill a process if it runs out of resources but I think it's killing it to early and want to squeeze the mem usage as much as possible.
The ulimit output is as follows...
ubuntu@ip-10-156-243-111:/var/log$ ulimit -a
core file size (blocks, -c) 0
data seg size (kbytes, -d) unlimited
scheduling priority (-e) 0
file size (blocks, -f) unlimited
pending signals (-i) 1967992
max locked memory (kbytes, -l) 64
max memory size (kbytes, -m) unlimited
open files (-n) 1024
pipe size (512 bytes, -p) 8
POSIX message queues (bytes, -q) 819200
real-time priority (-r) 0
stack size (kbytes, -s) 8192
cpu time (seconds, -t) unlimited
max user processes (-u) 1967992
virtual memory (kbytes, -v) unlimited
file locks (-x) unlimited
The kern.log output is...
340 total pagecache pages
0 pages in swap cache
Swap cache stats: add 0, delete 0, find 0/0
Free swap = 0kB
Total swap = 0kB
63999984 pages RAM
1022168 pages reserved
649 pages shared
62830686 pages non-shared
[ pid ] uid tgid total_vm rss cpu oom_adj oom_score_adj name
[ 505] 0 505 4342 93 9 0 0 upstart-udev-br
[ 507] 0 507 5456 198 2 -17 -1000 udevd
[ 642] 0 642 5402 155 28 -17 -1000 udevd
[ 643] 0 643 5402 155 29 -17 -1000 udevd
[ 739] 0 739 3798 49 10 0 0 upstart-socket-
[ 775] 0 775 1817 124 25 0 0 dhclient3
[ 897] 0 897 12509 152 10 -17 -1000 sshd
[ 949] 101 949 63430 91 9 0 0 rsyslogd
[ 990] 102 990 5985 90 8 0 0 dbus-daemon
[ 1017] 0 1017 3627 40 9 0 0 getty
[ 1024] 0 1024 3627 41 10 0 0 getty
[ 1029] 0 1029 3627 43 6 0 0 getty
[ 1030] 0 1030 3627 41 3 0 0 getty
[ 1032] 0 1032 3627 41 1 0 0 getty
[ 1035] 0 1035 1083 34 1 0 0 acpid
[ 1036] 0 1036 4779 49 5 0 0 cron
[ 1037] 0 1037 4228 40 8 0 0 atd
[ 1045] 0 1045 3996 57 3 0 0 irqbalance
[ 1084] 0 1084 3627 43 2 0 0 getty
[ 1085] 0 1085 3189 39 11 0 0 getty
[ 1087] 103 1087 46916 300 0 0 0 whoopsie
[ 1159] 0 1159 20490 215 0 0 0 sshd
[ 1162] 0 1162 1063575 263 15 0 0 console-kit-dae
[ 1229] 0 1229 46648 153 4 0 0 polkitd
[ 1318] 1000 1318 20490 211 10 0 0 sshd
[ 1319] 1000 1319 6240 1448 1 0 0 bash
[ 1816] 1000 1816 70102543 62010032 4 0 0 java
[ 1947] 0 1947 20490 214 6 0 0 sshd
[ 2035] 1000 2035 20490 210 0 0 0 sshd
[ 2036] 1000 2036 6238 1444 13 0 0 bash
[ 2179] 1000 2179 13262 463 2 0 0 vi
Out of memory: Kill process 1816 (java) score 987 or sacrifice child
Killed process 1816 (java) total-vm:280410172kB, anon-rss:248040128kB, file-rss:0kB
The kern.log clearly states that it killed my process because it ran out of memory. But like I said I think I can squeeze it a bit more. Is there any settings I need to do to allow me to use the 226GB allocated to JAVA.
