CPU consumption is quite high

Hi All,
I have created one Flash application which reads the rss
feeds from the specific url and displays the data into datagrid.
Also It has two tickers scrolling right to left. If I run the
application from flash then it works fine with CPU consumption of
around 5. But I I make exe using Macromedia Zinc 2.5 and run that
exe, CPU consumption goes to 30-40. What could be the reason.
Please any one can tell me the cause....
Thanks in Advance.............

how do you measure CPU utilisation? iostat, top, looking for LA?
if your network management system runs OK and everybody is satisfied, then you should not care much about load.
what you should do is to estimate your capacites, make a test run, to determine at what point (io, cpu) users will start to experience problems,
i suppose NMS is a vital application for your network, so you server should be able to cope with at least 30% immediate increase of load.

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What does com.apple.cts.plugin do? It seems to be causing high CPU consumption by UserEventAgent

I have been having some trouble over the last couple of days with UserEventAgent process. It constantly consumes over 100% CPU. This of course results in obvious problems of the unit getting really hot, high CPU fan speed and faster battery drain.
While investigating the root cause, I removed each of the plugins (located at /System/Library/UserEventPlugins/) one by one and restarted the UserEventAgent process (if you force quit the process, it restarts) and each time, observed the impact on CPU consumption.
After a while, I was able to zero down on "com.apple.cts.plugin". If I removed this file from the plugins folder and forced UserEventAgent to restart, my CPU usage went back to normal with no excess heat or high-speed fan.
While it seems to solve my problem, I am left wondering what this plugin really does and if by not having it I am putting my system at risk.
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I learnt this the hard-way as well. I am not too sure but probably it has something to do with cerification authority or something like that. BTW I am looking for the answer as well.

High cpu consumption

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in a Confluence installation, running on cluster of WebLogic Servers 8.1.4, HP-UX, Java 1.4.2, we observe very often the app server processes keeping quite high levels of CPU consumption.
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Unfortunately I don't have the full dump anymore.
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at com.tangosol.util.SafeLinkedList.add(SafeLinkedList.java:91)
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at com.tangosol.coherence.component.util.queue.ConcurrentQueue.add(ConcurrentQueue.CDB:6)
at com.tangosol.coherence.component.util.daemon.queueProcessor.packetProcessor.PacketReceiver.onMessage(PacketReceiver.CDB:7)
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Cool, good start.
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CPU temperature seems rather high

I have a Lenovo Thinkpad R61, and my temperature under normal load seems to stagnate around 50 degrees Celcius, which seems kind of high. When put under heavy load (compiling a kernel) it steadily rose to around 66 degrees celcius before I stopped the operation. While under heavy load, /proc/acpi/ibm/fan reported 3202, and under normal load now it reports 3125. Is it just me, or this CPU temperature kind of high? What can I do about it?
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Last edited by violagirl23 (2008-06-02 07:34:56)

[rant]
Hah, IME laptops = heaters.
Even my dinosaur P2 celeron lappy gets to 70C CPU under load BEFORE the BIOS turns on the fan.
I think the idea is to hold off running the cooling as long as possible so cpuidle/speedstep can allow the chip to cool before using battery to run the fan.
As for the AC adaptor heating up, this smacks of poor design, the PSU should be able to maintain full load + battery charging for at least as long as a full charge from empty takes. Anything else is cutting corners based on 'yeah but how often will THAT happen'.
If your ACPI setup is not doing what it should, power consumption + heat output will be excesive under no/low load but full load power is full load power, as there is nothing to turn off.
My attitude would be, set up acpi and speedstep then ignore the temps. If it cooks under load then the hardware cooling solution is rubbish.
Seriously though, your temps sound quite normal. Look up the specs for your CPU on processorfinder.intel.com (or the AMD equivalent) you will probably be surprised at how high the max temperatures are. As for the AC adaptor - Don't run full speed while the battery is charging? The damn thing should be designed to handle it.
Do try and keep the HDD cool if you can - it is spinning down when not used right? Modern HDDs generate a fair bit of heat themselves when running and there ain't much airflow around the disc in most laptops.
EDIT: your HDD temps look sweet.
Have you played with laptop_mode?
[/rant]
Steve.
Last edited by steve_v (2008-06-07 02:30:59)

CPU consumption 100%: How do I see which SQL is consuming?

Hi,
I need help badly with this because I cannot get my head around the problem. I have a Windows server 2003 Enterprise 64-bit running Oracle 10.2.0.3 and last night it started consuming 100% CPU. The Windows performance monitor shows 100% CPU in any case, and it was difficult to even login via remote desktop.
It is Oracle.exe that is consuming, and there is only one database on this server. It is an Opteron 875 2.2Ghz with 8GB ram.
I want to see which SQL statement is responsible for the CPU consumption. I know exactly which user/programapplication is using it... it is useless to kick the session because the application connects immediately again from the app. server and runs the same thing. Restarting the database also has the same effect: session reconnects and CPU goes through the roof. Customer says that they are running the same stuff as always, and app. has not been updated recently. 100 % CPU to them, means something is wrong.
Incidently, I tried to CPU patch this database a couple of days beforehand, but there was not enough space on disk (needed 1.6GB) so opatch complained and would not continue. I simply restarted the database without having run opatch. I cannot imagine that this is the cause of this problem.
Anyhoo...
I have a script from Kyle Haileys web site to get the CPU for each sql_id using ash tables:
-- (c) Kyle Hailey 2007
col type for a10
select * from (
select
ash.SQL_ID , ash.SQL_PLAN_HASH_VALUE Plan_hash, aud.name type,
sum(decode(ash.session_state,'ON CPU',1,0)) "CPU",
sum(decode(ash.session_state,'WAITING',1,0)) -
sum(decode(ash.session_state,'WAITING', decode(wait_class, 'User I/O',1,0),0)) "WAIT" ,
sum(decode(ash.session_state,'WAITING', decode(wait_class, 'User I/O',1,0),0)) "IO" ,
sum(decode(ash.session_state,'ON CPU',1,1)) "TOTAL"
from v$active_session_history ash,
audit_actions aud
where SQL_ID is not NULL
and ash.sql_opcode=aud.action
and ash.sample_time > sysdate - &minutes /( 60*24)
group by sql_id, SQL_PLAN_HASH_VALUE , aud.name
order by sum(decode(session_state,'ON CPU',1,1)) desc
) where rownum < 10
This give following output:
SQL_ID PLAN_HASH TYPE CPU WAIT IO TOTAL
cxk376gut06wn 3831248992 SELECT 12 145 5855 6012
4ffvdt72n46yt 4094592372 SELECT 0 3 1131 1134
dnxgm7bg8wqg1 4025412530 SELECT 3 13 337 353
3y0dyvkc9sx69 1764840833 SELECT 18 169 56 243
abz05715h08ct 1967470119 SELECT 0 7 175 182
4gd6b1r53yt88 0 UNKNOWN 0 92 4 96
9phhuzxpqwsgc 2662599208 SELECT 0 67 0 67
275bbj5czbrwp 629013258 SELECT 0 2 64 66
1dvrrg3aah2mu 75914095 SELECT 0 6 57 63
My assumption is that this gives the average CPU usage over the last x minutes and the total cpu usage for this sql_id. There are no sql running that show a very high average CPU, but the total is up in 6000 for the longest running sql, so I get the statement for the top sql_id that has highest total, and it is this:
SQL_ID cxk376gut06wn, child number 2
SELECT NVL(MIN(ID),0) FROM TABLE_OBFUSCATED WHERE TASK = :B1 AND
STATUS='JobQueue' AND MESSAGE_ID IS NULL
Plan hash value: 3831248992
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
| 0 | SELECT STATEMENT | | | | 3231 (100)| |
| 1 | SORT AGGREGATE | | 1 | 42 | | |
|* 2 | TABLE ACCESS FULL| TABLE_OBFUSCATED | 3 | 126 | 3231 (1)| 00:00:39 |
Predicate Information (identified by operation id):
2 - filter(("TASK"=:B1 AND "STATUS"='JobQueue' AND "MESSAGE_ID" IS NULL))
It doesn't seem to fit! It's such a simple statement, but according to ash this is the sql using the most total cpu over the last 30 minutes?? So I create a temp index on the filter and check the plan for the statement again, and it uses the index, but I need to kill the session or bounce the database for the new plan to be used because the currently running session is still using the old plan. Customer was desperate to get it down so I even tried flushing the shared pool but new plan does not get used. I did not want to restart the database. Do I have to kill all sessions using that plan for the new one to take effect?
Now im stuck. I don't really know how else to get an accurate picture of which sql is currently consuming CPU. I need to know this to try to fix the SQL because stopping the application is not an option, even if it is throwing too much at the database. The only other option I can think of is setting up profile limits for cpu consumption in oracle, but then the job will likely take an unacceptable amount of time for the customer.
So my questions are:
1. How else can I check which SQL is using CPU accurately?
2. Does the SQL I show above accuratlely display current average CPU over x minutes with ASH? Why is it so low for the top consumer but my CPU is still at 100% on the OS?
Thankyou for your help.

Yeah, OK, I can see an arbitary number for CPU used since session startup (what does that refer to by the way? It can't be percent), and I can see that one user has consumed massive amounts of CPU compared to all other sessions, but he is currently not running anything, so how can I see which SQL he ran in the past day that cuased all that CPU consumption? Can I do this without AWR?
By the way, do you need a Diagnostic Pack license for simply viewing the Performance tab of dbconsole? I Can go into dbconsole and see history for 2 days back and see the massive espike that caused CPU consumption, but when dbconsole displays the list of top SQL and top sessions under the graph, is it the top listed SQL that consumed the most cpu or do you need to correlate the colours, i.e. find the SQL listed in top SQL that has the same colour as CPU usage on the graph (green) even if it is not listed as the top "consumer" (which I assume means top AAS consumer: overall consumption of all resources)?

Disk read is quite high

All,
I wrote query as below which is having quite high disk usage. I believe this to be reason for slow performance of my code (Although bad on performance tuning, but based on what I read on blogs that disk reads should be less). Any suggestion/help of how can this be performed fast.
SELECT DECODE (MSSO.SOURCE_TYPE, 1, 'T', 2, 'M', 3, 'B') SOURCE_TYPE ,
MSSO.RANK ,MSSO.ALLOCATION_PERCENT ,MSSO.VENDOR_ID ,MSSO.VENDOR_SITE_ID ,
MSSO.SOURCE_ORGANIZATION_ID ,TO_CHAR (MSRO.EFFECTIVE_DATE, 'RRRR/MM/DD')
ACTIVE_DATE ,TO_CHAR (MSRO.DISABLE_DATE, 'RRRR/MM/DD') END_DATE
FROM
MRP_SOURCING_RULES MSR ,MRP_SR_RECEIPT_ORG MSRO ,MRP_SR_SOURCE_ORG MSSO
WHERE MSR.SOURCING_RULE_ID = MSRO.SOURCING_RULE_ID AND MSSO.SR_RECEIPT_ID =
MSRO.SR_RECEIPT_ID AND MSR.SOURCING_RULE_ID = :B1 AND MSSO.RANK = (SELECT
MIN (RANK) FROM MRP_SR_SOURCE_ORG MSSO1 WHERE MSSO.SR_RECEIPT_ID =
MSSO1.SR_RECEIPT_ID) AND TRUNC (NVL (MSRO.EFFECTIVE_DATE, SYSDATE)) <=
TRUNC (SYSDATE) AND TRUNC (NVL (MSRO.DISABLE_DATE, SYSDATE)) >= TRUNC
(SYSDATE) AND ( EXISTS ( SELECT 1 FROM HR_ORGANIZATION_INFORMATION OOD ,
PO_VENDOR_SITES_ALL S WHERE OOD.ORGANIZATION_ID = :B2 AND
OOD.ORG_INFORMATION3 = S.ORG_ID AND OOD.ORG_INFORMATION_CONTEXT =
'Accounting Information' AND S.VENDOR_SITE_ID = MSSO.VENDOR_SITE_ID) OR
MSSO.VENDOR_SITE_ID IS NULL OR MSSO.SOURCE_TYPE <>3)
call count cpu elapsed disk query current rows
Parse 1 0.00 0.00 0 0 0 0
Execute 89400 23.16 23.35 0 0 0 0
Fetch 89400 69.28 86.57 1338 1740766 0 88732
total 178801 92.44 109.93 1338 1740766 0 88732
Thanks
Sachin

And below is the Explain Plan it generated
Misses in library cache during parse: 1
Misses in library cache during execute: 1
Optimizer mode: ALL_ROWS
Parsing user id: 173     (recursive depth: 1)
Number of plan statistics captured: 1
Rows (1st) Rows (avg) Rows (max) Row Source Operation
         1          1          1 FILTER (cr=15 pr=11 pw=0 time=0 us)
         1          1          1   HASH GROUP BY (cr=15 pr=11 pw=0 time=0 us cost=12 size=131 card=1)
         1          1          1    FILTER (cr=15 pr=11 pw=0 time=0 us)
         1          1          1     NESTED LOOPS (cr=15 pr=11 pw=0 time=0 us)
         1          1          1      NESTED LOOPS (cr=14 pr=11 pw=0 time=0 us cost=11 size=131 card=1)
         1          1          1       NESTED LOOPS (cr=11 pr=11 pw=0 time=0 us cost=8 size=116 card=1)
         1          1          1        NESTED LOOPS (cr=7 pr=7 pw=0 time=0 us cost=5 size=62 card=1)
         1          1          1         INDEX UNIQUE SCAN MRP_SOURCING_RULES_U1 (cr=3 pr=3 pw=0 time=0 us cost=2 size=18 card=1)(object id 39415)
         1          1          1         TABLE ACCESS BY INDEX ROWID MRP_SR_RECEIPT_ORG (cr=4 pr=4 pw=0 time=0 us cost=3 size=44 card=1)
         1          1          1          INDEX RANGE SCAN MRP_SR_RECEIPT_ORG_U2 (cr=3 pr=3 pw=0 time=0 us cost=2 size=0 card=1)(object id 39599)
         1          1          1        TABLE ACCESS BY INDEX ROWID MRP_SR_SOURCE_ORG (cr=4 pr=4 pw=0 time=0 us cost=3 size=54 card=1)
         1          1          1         INDEX RANGE SCAN MRP_SR_SOURCE_ORG_U2 (cr=3 pr=3 pw=0 time=0 us cost=2 size=0 card=1)(object id 39656)
         1          1          1       INDEX RANGE SCAN MRP_SR_SOURCE_ORG_U2 (cr=3 pr=0 pw=0 time=0 us cost=2 size=0 card=1)(object id 39656)
         1          1          1      TABLE ACCESS BY INDEX ROWID MRP_SR_SOURCE_ORG (cr=1 pr=0 pw=0 time=0 us cost=3 size=15 card=1)
         0          0          0     NESTED LOOPS (cr=0 pr=0 pw=0 time=0 us cost=4 size=30 card=1)
         0          0          0      TABLE ACCESS BY INDEX ROWID PO_VENDOR_SITES_ALL (cr=0 pr=0 pw=0 time=0 us cost=2 size=9 card=1)
         0          0          0       INDEX UNIQUE SCAN PO_VENDOR_SITES_U1 (cr=0 pr=0 pw=0 time=0 us cost=1 size=0 card=1)(object id 3521718)
         0          0          0      TABLE ACCESS BY INDEX ROWID HR_ORGANIZATION_INFORMATION (cr=0 pr=0 pw=0 time=0 us cost=2 size=21 card=1)
         0          0          0       INDEX RANGE SCAN HR_ORGANIZATION_INFORMATIO_FK2 (cr=0 pr=0 pw=0 time=0 us cost=1 size=0 card=1)(object id 3521010)

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Seems my CPU usage is very high.
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I'm not making much progress.
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Hi,
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Hi,
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Hello Experts,
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1. When Buffer cache is more than required then DB CPU wait event occur.
Regards,
Sachin

Sachin.Ichake wrote:
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Copyright (c) 1996, 2006 Oracle Corporation. All rights reserved.
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