Thanks on fast replay. My colleague started to complain that system is suddenly become very slow. I did some nmon stats and find out that system is generating more than 13000 I/O in sec and lots of page faults. I did some adjustments on AIX OS;
I also edit /etc/filesystems and use 'dio' because AIX lpar is attached to SAN so I want to take advantage of caching, throughput optimization, and performance by enabling file system direct I/O on AIX. This, according to my knowledge, will allow the file system buffer cache to be bypassed which eliminates the double buffering of data with mySQL which can adversely affect file system I/O performance. I tried to upload excel zip file of nmon statistic but error always appeard (file is less then 3 MB). Problem still remain, slow performance.
Some new stats are:
Code:
# vmstat -s──────────────────────────────────────────────────────────┘
788510 total address trans. faults
49725 page ins
11898 page outs
0 paging space page ins
0 paging space page outs
0 total reclaims
440936 zero filled pages faults
4617 executable filled pages faults
0 pages examined by clock
0 revolutions of the clock hand
0 pages freed by the clock
60589 backtracks
0 free frame waits
0 extend XPT waits
19289 pending I/O waits
61623 start I/Os
32640 iodones
133924 cpu context switches
35253 device interrupts
16549 software interrupts
78787 decrementer interrupts
1491 mpc-sent interrupts
1491 mpc-received interrupts
300 phantom interrupts
0 traps
958258 syscalls
Code:
# vmstat 5 5─────────────────────────────────────────────────────────┘
System configuration: lcpu=8 mem=5120MB ent=1.80
kthr memory page faults cpu
----- ----------- ------------------------ ------------ -----------------------
r b avm fre re pi po fr sr cy in sy cs us sy id wa pc ec
1 0 314163 966357 0 0 0 0 0 0 2 210 170 0 0 99 0 0.01 0.3
1 0 314163 966357 0 0 0 0 0 0 0 30 159 0 0 99 0 0.01 0.3
1 0 314172 966348 0 0 0 0 0 0 1 364 165 1 1 98 0 0.04 2.3
1 0 314172 966348 0 0 0 0 0 0 47 138 262 0 0 99 0 0.01 0.5
1 1 314228 966291 0 0 0 0 0 0 311 1517 846 1 1 97 1 0.05 2.5
Hello
Please can you tell me how to access COPY ON WRITE page faults in HP -UNIX.
I found the structure in
/usr/include/sys/vmmeter with the structure name vmmeter.
Please tell me the function to fill the values to this structure and also
the arguments for function.:: (5 Replies)
Hi,
Will anybody tell me what is this 'intransient blocking page faults' in HP-UX, it is in the structure _pst_vminfo in the header file /ust/include/sys/pstat/vm_pstat_body.h? (4 Replies)
Hi,
I want to know if there is any command which will tell me if an AIX machine is a LPar or not. I am using "lparstat -i" but it does not work on all AIX machines. Is there any generic command by whose output I will come to know if it is an LPar or not?
Please help.
Thanks,
Vineet (3 Replies)
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