How to find culprid of high SYS CPU % ?

Does anyone know a command to find the culprid of a high CPU utilization of kernel syscalls?
My actual SYS CPU usage is over twice the USR value and I think this not normal.
Thanks in advance,
HJ.

i am curious. have u been reading the details off your process manager or through ps -ef or pgrep?
but i do agree, that sounds alittle strange for any process to be taking up so much.

Similar Messages

How to troubleshooting high sys cpu usage ???

how to troubleshooting high sys cpu usage ???

Hi,I have post the top 5 event above.
before tuning:
SQL ordered by Gets
•     Resources reported for PL/SQL code includes the resources used by all SQL statements called by the code.
•     Total Buffer Gets: 4,348,081
•     Captured SQL account for 73.3% of Total
Buffer Gets      Executions      Gets per Exec      %Total     CPU Time (s)     Elapsed Time (s)     SQL Id     SQL Module     SQL Text
1,768,970     2,593     682.21     40.68     32.47     1375.28     a2vm9mf99ma3p
     select
712,504     2,883     247.14     16.39     13.14     83.85     66vrg3gz2stvf
     select
130,928     7,901     16.57     3.01     7.83     10.49     ctnn0bpfd3v5k
     select
92,800     2,902     31.98     2.13     2.73     6.40     2985xzq8x547u
     select
81,498     27,159     3.00     1.87     3.12     3.98     1prkhshjp25sc
     select
60,513     2,631     23.00     1.39     2.29     5.64     2d8w9016z0kug
     select
55,416     15,835     3.50     1.27     2.12     2.39     8tk22zsappg9m
     select
44,879     15,838     2.83     1.03     1.74     1.89     c6sjzyfh9jmz0
     select
31,677     10,558     3.00     0.73     1.15     1.24     5yr7z98xmcpqz
     select
26,346     13,172     2.00     0.61     1.31     1.47     36shs0f8kxp5z
     select after tuning:
SQL ordered by Gets
•     Resources reported for PL/SQL code includes the resources used by all SQL statements called by the code.
•     Total Buffer Gets: 7,734,429
•     Captured SQL account for 99.4% of Total
Buffer Gets      Executions      Gets per Exec      %Total     CPU Time (s)     Elapsed Time (s)     SQL Id     SQL Module     SQL Text
1,728,723     99,759     17.33     22.35     113.87     119.45     309a6ak09rud2
     select
996,920     332,437     3.00     12.89     41.57     44.03     1prkhshjp25sc
     select
964,093     199,469     4.83     12.46     32.19     33.28     8tk22zsappg9m
     select
531,776     33,241     16.00     6.88     34.38     36.36     2985xzq8x547u
     select
432,140     199,473     2.17     5.59     20.86     21.57     c6sjzyfh9jmz0
     select
332,406     166,226     2.00     4.30     17.28     17.84     36shs0f8kxp5z
     select
265,872     33,234     8.00     3.44     7.74     8.09     4a34fa9tt90wx
     select *
232,617     33,243     7.00     3.01     7.54     7.78     53rvrd0ug5gwm
     select
232,603     33,237     7.00     3.01     9.24     9.83     9254c5ag3z9qd
     select
232,589     33,239     7.00     3.01     8.11     8.40     gum17w9qgrw8p
     select co
232,547     33,246     6.99     3.01     12.56     13.21     cx8yttzjh9ftz
     select
232,484     33,244     6.99     3.01     10.08     11.07     gbx7hs3ykpjqs
     select
199,446     99,753     2.00     2.58     11.27     11.89     2hpja5k312kwa
     select
199,428     33,241     6.00     2.58     9.15     9.56     2d8w9016z0kug
     select
199,389     199,469     1.00     2.58     19.59     20.25     b9j0pb2d5cn69
     select
133,004     33,253     4.00     1.72     17.56     18.67     a2vm9mf99ma3p
     select
99,756     33,255     3.00     1.29     3.77     3.92     5yr7z98xmcpqz
     select
99,747     33,258     3.00     1.29     4.58     4.70     1fnshqnqxjtqz
     select

How to find which query taking more cpu

Hi,
How to find which query taking more CPU
at a particular point of time .
Chhers,

Take a look at Server Standard Reports. It has a few CPU usage oriented reports.
You can also track CPU usage by server-side tracing:
http://www.sqlusa.com/bestpractices/createtrace/
Glenn Berry's CPU usage query:
SELECT TOP(25) p.name AS [SP Name], qs.total_worker_time AS [TotalWorkerTime],
qs.total_worker_time/qs.execution_count AS [AvgWorkerTime], qs.execution_count,
ISNULL(qs.execution_count/DATEDIFF(Second, qs.cached_time, GETDATE()), 0) AS [Calls/Second],
qs.total_elapsed_time, qs.total_elapsed_time/qs.execution_count
AS [avg_elapsed_time], qs.cached_time
FROM sys.procedures AS p WITH (NOLOCK)
INNER JOIN sys.dm_exec_procedure_stats AS qs WITH (NOLOCK)
ON p.[object_id] = qs.[object_id]
WHERE qs.database_id = DB_ID()
ORDER BY qs.total_worker_time DESC OPTION (RECOMPILE);
LINK:
http://dba.stackexchange.com/questions/52216/sql-server-2008-high-cpu-historical-queries
Query optimization:
http://www.sqlusa.com/articles/query-optimization/
Kalman Toth Database & OLAP Architect
SELECT Video Tutorials 4 Hours
New Book / Kindle: Exam 70-461 Bootcamp: Querying Microsoft SQL Server 2012

What is a common cause for high sys CPU time and system faults on an Iplanet server?

Hi,
A newbie question...
I am benchmarking an application which uses Iplanet on Solaris (2X400mhz cpus). vmstat output follows.
Note the high sys time and relatively lower user mode time. Also relatively high system fault rate. Is this
normal? If not, common causes?
fyi - we are not running Java VM on this server.
I have TRUSS output showing kernal activity but dont want to post it here without some further guidance
on what if anything in it might be helpful.
Thanks!
Bernie
procs memory page disk faults cpu
r b w swap free re mf pi po fr de sr s0 s6 s7 s8 in sy cs us sy id
0 0 0 2494224 481536 3 10 3 0 0 0 0 1 0 1 0 413 697 443 1 2 97
0 0 0 2428464 414368 0 122 0 0 0 0 0 45 0 45 0 972 53598 575 5 28 67
1 0 0 2428512 414456 0 242 0 0 0 0 0 0 0 0 0 563 1368 756 4 46 50
0 0 0 2428440 414440 0 263 0 0 0 0 0 0 0 0 0 636 2229 1268 6 49 46
1 0 0 2428240 414264 10 253 0 0 0 0 0 6 0 6 0 692 176918 873 16 49 3

Hello
You can change the DB isolation level to Read uncommitted
http://technet.microsoft.com/en-us/library/ms378149(v=sql.110).aspx
or use WITH (NOLOCK)
I do use NOLOCK option for the dirty reads to avoid locks on the tables
Javier Villegas |
@javier_vill | http://sql-javier-villegas.blogspot.com/
Please click "Propose As Answer" if a post solves your problem or "Vote As Helpful" if a post has been useful to you

How to find discoverer log files and CPU usage

Hi,
i have a report running very slow in prod. but runs fast in dev and qa.
**Where/how can i find the Log files generated after the report runs?**
**Also i wanted to see how i can find the CPU Usage**
i searched online for CPU usage... and found this --> ""For the CPU usage of these servlets, please navigate to the Discoverer application page from the OC4J_BI_Forms home page in the EM standalone console.""
can anyone tell me how to navigate to OC4J_BI_Forms home page in the EM standalone console?
Thanks!
gayatri

Hi gayathri,
This link would help i suppose
http://docs.huihoo.com/oracle/docs/B14099_19/bi.1012/b13918/maint.htm#i1025807
and http://docs.huihoo.com/oracle/docs/B14099_19/bi.1012/b13918/tshoot.htm#CHDHFJDE
Be careful,if not done without prior knowledge it would mess up.So mostly this job should be done by DBA of your company.They can log in as sysadministrator to get to "Enterprise Manager" and do as per the link
Best Wishes,
Kranthi.

How to find out the JVM thread that is consuming high CPU

I am using WL 10.3, JRockit JVM on Linux. I have taken thread dumps. How to find out the JVM thread that is consuming high CPU?
I know how to map it Sun JVM on Solaris. I haven't done in on JRockit so far. Please advise.

Check out some of Marcus Hirt's blog entries for details about how to use JRockit Mission Control. It's a very nice tool that should provide a lot of insight:
http://blogs.oracle.com/hirt/

Only one CPU core high sys usage when create database instance via dbca

when using dbca to create database instance
JUST ONLY ONE CPU core high sys usage
how to troubleshoot it
see this:
top - 09:28:19 up 55 days, 20:38, 10 users, load average: 1.00, 1.08, 1.31
Tasks: 1231 total,   2 running, 1228 sleeping,   0 stopped,   1 zombie
Cpu(s): 0.0%us, 1.3%sy, 0.0%ni, 98.7%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Mem: 57588328k total, 55028620k used, 2559708k free,   196852k buffers
Swap: 16386292k total,    23156k used, 16363136k free, 23011232k cached
PID USER      PR NI VIRT RES SHR S %CPU %MEM    TIME+ COMMAND
11343 oracle    25   0 1771m 30m 23m R 99.7 0.1   5:36.39 oracle
3692 oracle    16   0 13948 2348 816 S 1.6 0.0 17:00.94 top
11432 root      15   0 13540 2024 820 R 1.3 0.0   0:00.21 top
11034 oracle    16   0 737m 171m 33m S 0.3 0.3   0:52.39 java
11435 oracle    15   0 66056 1596 1180 S 0.3 0.0   0:00.01 bash
    1 root      15   0   784 172 160 S 0.0 0.0 38:56.76 init
    2 root      RT -5     0    0    0 S 0.0 0.0   0:00.58 migration/0
    3 root      34 19     0    0    0 S 0.0 0.0   0:00.75 ksoftirqd/0
    4 root      RT -5     0    0    0 S 0.0 0.0   0:00.00 watchdog/0
    5 root      RT -5     0    0    0 S 0.0 0.0   0:00.81 migration/1
    6 root      34 19     0    0    0 S 0.0 0.0   0:00.00 ksoftirqd/1
    7 root      RT -5     0    0    0 S 0.0 0.0   0:00.00 watchdog/1
    8 root      RT -5     0    0    0 S 0.0 0.0   0:02.53 migration/2    mpstat info
[root@localhost ~]# mpstat -P ALL 2
Linux 2.6.18-164.el5 (localhost.localdomain)    09/12/12
09:29:09     CPU   %user   %nice    %sys %iowait    %irq   %soft %steal   %idle    intr/s
09:29:11     all    0.01    0.00    1.27    0.01    0.00    0.01    0.00   98.69   1658.29
09:29:11       0    0.50    0.00    0.00    0.00    0.00    0.50    0.00   98.99   1657.29
09:29:11      73    0.00    0.00    0.00    0.00    0.00    0.00    0.00 100.00      0.00
09:29:11      74    0.00    0.00 100.00    0.00    0.00    0.00    0.00    0.00      0.00
09:29:11      75    0.00    0.00    0.00    0.00    0.00    0.00    0.00 100.00      0.00
09:29:11      76    0.00    0.00    0.00    0.00    0.00    0.00    0.00 100.00      0.00
09:29:11      77    0.00    0.00    0.00    0.00    0.00    0.00    0.00 100.00      0.00
09:29:11      78    0.00    0.00    0.00    0.00    0.00    0.00    0.00 100.00      0.00
09:29:11      79    0.00    0.00    0.00    0.00    0.00    0.00    0.00 100.00      0.00
09:29:11     CPU   %user   %nice    %sys %iowait    %irq   %soft %steal   %idle    intr/s
09:29:13     all    0.01    0.00    1.26    0.01    0.00    0.02    0.00   98.70   1761.19
09:29:13       0    0.50    0.00    0.50    1.00    0.00    1.99    0.00   96.02   1761.19
09:29:13      71    0.00    0.00    0.00    0.00    0.00    0.00    0.00 100.00      0.00
09:29:13      72    0.00    0.00    0.00    0.00    0.00    0.00    0.00 100.00      0.00
09:29:13      73    0.00    0.00    0.00    0.00    0.00    0.00    0.00 100.00      0.00
09:29:13      74    0.00    0.00 100.00    0.00    0.00    0.00    0.00    0.00      0.00
09:29:13      75    0.00    0.00    0.00    0.00    0.00    0.00    0.00 100.00      0.00
09:29:13      76    0.00    0.00    0.00    0.00    0.00    0.00    0.00 100.00      0.00
09:29:13      77    0.00    0.00    0.00    0.00    0.00    0.00    0.00 100.00      0.00
09:29:13      78    0.00    0.00    0.00    0.00    0.00    0.00    0.00 100.00      0.00
09:29:13      79    0.00    0.00    0.00    0.00    0.00    0.00    0.00 100.00      0.00          you can see there is only one CPU CORE (core 74 but is random , other core have same status but just one CPU core)
[root@localhost ~]# vmstat -S m 2
procs -----------memory---------- ---swap-- -----io---- --system-- -----cpu------
r b   swpd   free   buff cache   si   so    bi    bo   in   cs us sy id wa st
3 0     23   1861    203 24267    0    0     8    12    0    0 0 0 99 0 0
4 0     23   1845    203 24262    0    0   602 16460 3682 8121 2 2 96 1 0
3 0     23   1842    203 24276    0    0   692 7520 3297 6610 2 2 97 0 0
3 0     23   1830    203 24277    0    0   786 3040 3302 7118 2 2 97 0 0
4 0     23   1829    203 24277    0    0   126 3144 3247 7343 2 1 97 0 0
3 0     23   1827    203 24279    0    0    76 2944 3292 7502 2 2 96 0 0
3 0     23   1823    203 24281    0    0     0 3248 3164 7656 2 1 97 0 0
2 0     23   1827    203 24279    0    0     0 3646 3080 7480 2 1 97 0 0
2 0     23   1828    203 24279    0    0     0   476 2942 5648 1 1 98 0 0
3 0     23   1824    203 24281    0    0     2 7476 3377 8111 2 2 97 0 0iostat infor
avg-cpu: %user   %nice %system %iowait %steal   %idle
           1.28    0.00    1.29    0.00    0.00   97.43
Device:            tps   Blk_read/s   Blk_wrtn/s   Blk_read   Blk_wrtn
hda               0.00         0.00         0.00          0          0
sda               5.47         0.00        83.58          0        168
sda1              0.00         0.00         0.00          0          0
sda2              5.47         0.00        83.58          0        168
sda3              0.00         0.00         0.00          0          0
sda4              0.00         0.00         0.00          0          0
sda5              0.00         0.00         0.00          0          0
sdb               8.96         0.00       123.38          0        248
sdb1              8.96         0.00       123.38          0        248
avg-cpu: %user   %nice %system %iowait %steal   %idle
           1.27    0.00    1.27    0.00    0.00   97.46
Device:            tps   Blk_read/s   Blk_wrtn/s   Blk_read   Blk_wrtn
hda               0.00         0.00         0.00          0          0
sda               0.00         0.00         0.00          0          0
sda1              0.00         0.00         0.00          0          0
sda2              0.00         0.00         0.00          0          0
sda3              0.00         0.00         0.00          0          0
sda4              0.00         0.00         0.00          0          0
sda5              0.00         0.00         0.00          0          0
sdb              17.50         0.00       236.00          0        472
sdb1             17.50         0.00       236.00          0        472
avg-cpu: %user   %nice %system %iowait %steal   %idle
           1.29    0.00    1.30    0.01    0.00   97.41
Device:            tps   Blk_read/s   Blk_wrtn/s   Blk_read   Blk_wrtn
hda               0.00         0.00         0.00          0          0
sda               0.50         0.00        16.00          0         32
sda1              0.00         0.00         0.00          0          0
sda2              0.50         0.00        16.00          0         32
sda3              0.00         0.00         0.00          0          0
sda4              0.00         0.00         0.00          0          0
sda5              0.00         0.00         0.00          0          0
sdb               7.50         0.00       144.00          0        288
sdb1              7.50         0.00       144.00          0        288more detail:
database version 11.2.0.2.0
system version
[root@localhost ~]# cat /etc/issue
Red Hat Enterprise Linux Server release 5.4 (Tikanga)
Kernel \r on an \m
[root@localhost ~]# lsb_release
LSB Version:    :core-3.1-amd64:core-3.1-ia32:core-3.1-noarch:graphics-3.1-amd64:graphics-3.1-ia32:graphics-3.1-noarch
[root@localhost ~]# uname -a
Linux localhost.localdomain 2.6.18-164.el5 #1 SMP Tue Aug 18 15:51:48 EDT 2009 x86_64 x86_64 x86_64 GNU/Linuxhardware info
vendor_id       : GenuineIntel
cpu family      : 6
model           : 47
model name      :        Intel(R) Xeon(R) CPU E7- 4860 @ 2.27GHz
stepping        : 2
cpu MHz         : 2261.057
cache size      : 24576 KB
physical id     : 3
siblings        : 20
core id         : 18
cpu cores       : 10
apicid          : 229
fpu             : yes
fpu_exception   : yes
cpuid level     : 11
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall nx pdpe1gb rdtscp lm constant_tsc ida nonstop_tsc pni monitor ds_cpl vmx smx est tm2 cx16 xtpr popcnt lahf_lm
bogomips        : 4522.11
clflush size    : 64
cache_alignment : 64
address sizes   : 44 bits physical, 48 bits virtual
[root@localhost ~]# free -m
             total       used       free     shared    buffers     cached
Mem:         56238      55892        346          0        196      23645
-/+ buffers/cache:      32050      24188
Swap:        16002         22      15979
[root@localhost ~]# df -h
Filesystem            Size Used Avail Use% Mounted on
/dev/sda2              19G 4.9G   14G 27% /
/dev/sda5             230G   27G 192G 12% /home
/dev/sda1              99M   12M   83M 13% /boot
/dev/sdb1             2.9T 2.3T 464G 84% /arrayEdited by: JOhnLiu on Sep 11, 2012 7:31 PM

JOhnLiu wrote:
thanks for reply sb92075
[root@localhost ~]# mpstat -P ALL 2
Linux 2.6.18-164.el5 (localhost.localdomain)    09/12/12
09:29:09     CPU   %user   %nice    %sys %iowait    %irq   %soft %steal   %idle    intr/s
09:29:11     all    0.01    0.00    1.27    0.01    0.00    0.01    0.00   98.69   1658.29
09:29:11       0    0.50    0.00    0.00    0.00    0.00    0.50    0.00   98.99   1657.29
09:29:11      73    0.00    0.00    0.00    0.00    0.00    0.00    0.00 100.00      0.00
09:29:11      74    0.00    0.00 100.00    0.00    0.00    0.00    0.00    0.00      0.00
09:29:11      75    0.00    0.00    0.00    0.00    0.00    0.00    0.00 100.00      0.00
09:29:11      76    0.00    0.00    0.00    0.00    0.00    0.00    0.00 100.00      0.00I think you don't understand what i mean .
there just have ONLY ONE CORE %sys 100
the top command show average of all cpu core sys% usage
when the one core sys% is 100%
the system are very slow .
e.g: when I create a database instance used for a long time . over 2 hours
but generally it will be done at most 1 hours or shorteris any type of OS virtualization involved in this environment?

How to find out CPU and memory usage for an instance?

Hi DBA Gurus,
How to find out CPU usage and memory usage for an instance?
Any information is appreciated!
Thank you!
Robert

you can calculate cpu usage by adding fallowing three factors which you can get from v$sysstat
1. Parse CPU time : This represents the percentage of CPU time spent parsing SQL statements. Parse time CPU can be a strong indication that an application has not been well tuned. High parse time CPU usually indicates that the application may be spending too much time opening and closing cursors or is not using bind variables.
2. Recursive CPU time : Sometimes, to execute a SQL statement issued by a user, the Oracle Server must issue additional statements. Such statements are called recursive calls or recursive SQL statements. For example, if you insert a row into a table that does not have enough space to hold that row, the Oracle Server makes recursive calls to allocate the space dynamically if dictionary managed tablespaces are being used.
Recursive calls are also generated due to the inavailability of dictionary info in the dictionary cache, firing of database triggers, execution of DDL, execution of SQL within PL/SQL blocks, functions or stored procedures and enforcement of referential integrity constraints
3. Other CPU time : This represents the percentage of time spent looking for buffers, fetching rows or index keys, etc. Generally, \"Other\" CPU should represent the highest percentage of CPU time out of the total CPU time used.
total memory used you can calculate adding
total_agrigate_area+sga
memory usage on os level you can know by fallowing commands
vmstat 5 20 depending upon os

Finding Current High-Consuming CPU SQLs

Hi All,
How do we find SQL's consuming most CPU at the current moment. If I find SQL's from V$SQLAREA and sort descending based on CPU_TIME, it may be idle sessions as CPU_TIME gives the cumulative cpu time. Current high-consuming SQL may not even figure on top if cumulative cpu time is less. I am interested in finding top 10 SQL's at the current moment. Is there a way we find the top consumers of CPU?
Thanks,
...

you can use top,nmon or topass command at OS level to find out PID consuming maximum CPU and resources .. you can use this PID and qury against
v$sesson , V$process and v$SQL to find out user session and SQL been consuming max CPU time and resources.
select a.username , a.program , to_char(a.LOGON_TIME,'dd-mon-yy:hh24:mi'),c.sql_text from v$session a ,
v$process b , v$sql c where
a.paddr=b.addr and a.sql_id=c.sql_id and b.spid='you OS PID' ;

How to find top 10 SQL statments which are consuming more cpu time.

hi all,
Is there any command or script to monitor the top 10 sql statments which are consuming more cpu time.
I know by using AWR REPORT we can find it, i want the command or script to find the top cpu utilization sql statments.
Regards
Subhash.

Subhash,
A quick and dirty Google search could have get you started with the following:
Thread: how to get top CPU consuming sql oracle 10g
Re: how to get top CPU consuming sql oracle 10g
Oracle SQL top sessions
http://www.dba-oracle.com/oracle10g_tuning/t_sql_top_sessions.htm
"How to Find top 10 expensive sql's", version 9.2.0
http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:73325450402303
HTH,
Thierry

How to find High level water mark

Hi all,
How to find high level water mark of a table.
Thanks,
Bhanu Chander.

Probably you mean High Water Mark.
select blocks from user_segments where segment_name='YOUR TABLE';
exec dbms_stats.gather_table_stats('YOU','YOUR TABLE')
select blocks from user_tables where table_name='YOUR TABLE';
subtract the last number from the first number. That is where your High Water Mark stands.
Kind regards
Uwe
http://uhesse.wordpress.com
Correction: The last number is where your HWM stands. The difference between the two numbers is the amount of blocks where no row has been yet :-)
Edited by: Uwe Hesse on 26.06.2009 21:00

How to find the CPU utilization from the portal front end

HI Guys,
I want to find the CPU utilization from the portal front end browser screen.Can you please let me know how to find this and also the path to find it.
And how to find the CPU utilization from the server.What is the command to find the CPU utilization at unix level.
Regards,
Krishnam.

hi you can create transient field in view object indicate to visibility of row (boolean ) and create view criteria that show only rows that are able to be visible according to transient attribute and at the update process set the attribute to true inside entityImpl class

How to find a memory and CPU used by a specific concurrent program ?

Dear All ,
How to find a memory and CPU used by a specific concurrent program ?
Thanks.

Hi,
How to find a memory and CPU used by a specific concurrent program ?
Could you please let us can we get the
memory used for a specific concurrent request .
Please refer scripts available at:
Concurrent Manager and program related scripts
Queries : Concurrent Managers/Processes
Thanks &
Best Regards,

How to find CPU and Memory Utilization

Hi,
How to find CPU and Memory Utilization of my application which is
running in solaris workstation.My application has a management console in which we need to update the cpu and memory periodically.
(Notr : Usage of JNI is restrcited)
Thnx and Rgds,
Mohan

There is no CPU usage API in Java. You need some JNI code. For memory usage see the Runtime methods:
     * Get information of memory usage: max, total, free and (available/used).
     * <ul>
     * <li>Max is the maximum amount of bytes the application can allocate (see also java options -Xmx). This value is fixed.
     * If the application tries to allocate more memory than Max, an OutOfMemoryError is thrown.
     * <li>Total is the amount of bytes currently allocated from the JVM for the application.
     * This value just increases (and doesn't decrease) up to the value of Max depending on the applications memory
     * requirements.
     * <li>Free is the amount of memory that once was occupied by the application but is given back to the JVM. This value
     * varies between 0 and Total.
     * <li>The used amount of memory is the memory currently allocated by the application. This value is always less or equal
     * to Total.
     * <li>The available amount of memory is the maximum number of bytes that can be allocated by the application (Max - used).
     * </ul>
     * In brief: used <= total <= max
     * <p>
     * The JVM can allocate up to 64MB (be default) system memory for the application. If more is required, the JVM has to be started with the Xmx option
     * (e.g. "java -Xmx128m" for 128 MB). The amount of currently allocated system memory is Total. As the JVM can't give back unallocated memory
     * to the operating system, Total can just increase (up to Max).
     * @return Memory info.
    static public String getMemoryInfo() {
        StringBuilder sb = new StringBuilder();
        sb.append("Used: ");
        sb.append(toMemoryFormat(getUsedMemory()));
        sb.append(", Available: ");
        sb.append(toMemoryFormat(getAvailableMemory()));
        sb.append(" (Max: ");
        sb.append(toMemoryFormat(Runtime.getRuntime().maxMemory()));
        sb.append(", Total: ");
        sb.append(toMemoryFormat(Runtime.getRuntime().totalMemory()));
        sb.append(", Free: ");
        sb.append(toMemoryFormat(Runtime.getRuntime().freeMemory()));
        sb.append(")");
        return sb.toString();
    }//getMemoryInfo()

Could you please tell me how to find the cause that made I/O high

Could you please tell me how to find the cause that made I/O high
please let me know

hi ,
Without any backgound inforamation it is very difficilate to help u out .
Please Provide the statpack/Awr report durring that priode. oherwise top 5 wait event. so we can give some suggestion on this.

How to find culprid of high SYS CPU % ?

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