High IOWait executing JBoss 3.2.7
- by user64205
Server Details:
Kernel: Linux wiq31 2.4.21-9.ELsmp #1 SMP Thu Jan 8 17:08:56 EST 2004 i686 i686 i386 GNU/Linux
CPU: 4 x Intel(R) Xeon(TM) CPU 3.06GHz
Memory: 1028520 kB
JBoss version: 3.2.7
Every time i try to start JBoss, in all CPU's, the iowait values starts to raise and the idle values starts to fall.
Before executing my JBoss application, the free command returns the following output:
*total used free shared buffers cached
Mem: 1028520 966400 62120 0 187756 538928
-/+ buffers/cache: 239716 788804
Swap: 2044072 790672 1253400*
After starting my JBoss application, the free command returns the following output:
*total used free shared buffers cached
Mem: 1028520 1007648 20872 0 187116 524084
-/+ buffers/cache: 296448 732072
Swap: 2044072 819096 1224976*
After starting my JBoss application, without answering any request, the java process /proc/PID/status file have the following values:
State: S (sleeping)
SleepAVG: 27%
Tgid: 24022
Pid: 24022
PPid: 21011
TracerPid: 0
Uid: 500 500 500 500
Gid: 500 500 500 500
FDSize: 256
Groups: 500
VmSize: 775200 kB
VmLck: 0 kB
VmRSS: 156752 kB
VmData: 696752 kB
VmStk: 36 kB
VmExe: 21 kB
VmLib: 710375 kB
StaBrk: 0804f000 kB
Brk: 095bb000 kB
StaStk: bffff8c0 kB
ExecLim: ffffffff
Threads: 62
SigPnd: 0000000000000000
ShdPnd: 0000000000000000
SigBlk: 0000000000000000
SigIgn: 0000000000000000
SigCgt: 1000000180015ccf
CapInh: 0000000000000000
CapPrm: 0000000000000000
CapEff: 0000000000000000
Is this behavior being caused by memory swapping, or the short memory available in the server is enough to run my application?
