Noticable Performance Degradation
In my performance testing I have noticed some performance degradation wrt in memory databases. I am trying to understand what is causing it. I have summarized the results in graphs that show the behaviour. If you are interested in taking a look let me know and I will email you the full details. I would have posted the full details here but there is no option for attachments.
I have also seen some strange degradation behaviour wrt disk backed databases as well. If anyone is interested in helping/advising here I will also send you the full details.
DC
Sure, please send them to me and I'll take a look: [email protected]
Regards,
Michael Cahill, Oracle.
Similar Messages
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Performance degradation in pl/sql parsing
We are trying to use xml pl/sql parser and noticed performance degradation as we run multiple times. We zeroed into the following clause:
doc := xmlparser.getDocument(p);
The first time the procedure is run the elapsed time at sqlplus is something like .45sec, but as we run repeatedly in the same session the elapsed time keeps on increasing by .02 seconds. If we log out and start fresh, we start again from .45sec.
We noticed similar degradation with
p := xmlparser.newParser;
but we got around by making the 'p' variable as package variable, initializing it once and using the same for all invocations.
Any suggestions?
Thank you.Can I enhance the PL/SQL code for better performance ? Probably you can enhance it.
or, is this OK to take so long to process these many rows? It should take a few minutes, not several hours.
But please provide some more details like your database version etc.
I suggest to TRACE the session that executes the PL/SQL code, with WAIT events, so you'll see where and on what time is spent, you'll identify your 'problem statements very quickly' (after you or your DBA have TKPROF'ed the trace file).
SQL> alter session set events '10046 trace name context forever, level 12';
SQL> execute your PL/SQL code here
SQL> exitWill give you a .trc file in your udump directory on the server.
http://www.oracle-base.com/articles/10g/SQLTrace10046TrcsessAndTkprof10g.php
Also this informative thread can give you more ideas:
HOW TO: Post a SQL statement tuning request - template posting
as well as doing a search on 10046 at AskTom, http://asktom.oracle.com will give you more examples.
and reading Oracle's Performance Tuning Guide: http://www.oracle.com/pls/db102/to_toc?pathname=server.102%2Fb14211%2Ftoc.htm&remark=portal+%28Getting+Started%29 -
Performance Degradation - High fetches and Prses
Hello,
My analysis on a particular job trace file drew my attention towards:
1) High rate of Parses instead of Bind variables usage.
2) High fetches and poor number/ low number of rows being processed
Please let me kno as to how the performance degradation can be minimised, Perhaps the high number of SQL* Net Client wait events may be due to multiple fetches and transactions with the client.
EXPLAIN PLAN FOR SELECT /*+ FIRST_ROWS (1) */ * FROM SAPNXP.INOB
WHERE MANDT = :A0
AND KLART = :A1
AND OBTAB = :A2
AND OBJEK LIKE :A3 AND ROWNUM <= :A4;
call count cpu elapsed disk query current rows
Parse 119 0.00 0.00 0 0 0 0
Execute 239 0.16 0.13 0 0 0 0
Fetch 239 2069.31 2127.88 0 13738804 0 0
total 597 2069.47 2128.01 0 13738804 0 0
PLAN_TABLE_OUTPUT
Plan hash value: 1235313998
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
| 0 | SELECT STATEMENT | | 2 | 268 | 1 (0)| 00:00:01 |
|* 1 | COUNT STOPKEY | | | | | |
|* 2 | TABLE ACCESS BY INDEX ROWID| INOB | 2 | 268 | 1 (0)| 00:00:01 |
|* 3 | INDEX SKIP SCAN | INOB~2 | 7514 | | 1 (0)| 00:00:01 |
Predicate Information (identified by operation id):
1 - filter(ROWNUM<=TO_NUMBER(:A4))
2 - filter("OBJEK" LIKE :A3 AND "KLART"=:A1)
3 - access("MANDT"=:A0 AND "OBTAB"=:A2)
filter("OBTAB"=:A2)
18 rows selected.
SQL> SELECT INDEX_NAME,TABLE_NAME,COLUMN_NAME FROM DBA_IND_COLUMNS WHERE INDEX_OWNER='SAPNXP' AND INDEX_NAME='INOB~2';
INDEX_NAME TABLE_NAME COLUMN_NAME
INOB~2 INOB MANDT
INOB~2 INOB CLINT
INOB~2 INOB OBTAB
Is it possible to Maximise the rows/fetch
call count cpu elapsed disk query current rows
Parse 163 0.03 0.00 0 0 0 0
Execute 163 0.01 0.03 0 0 0 0
Fetch 174899 55.26 59.14 0 1387649 0 4718932
total 175225 55.30 59.19 0 1387649 0 4718932
Misses in library cache during parse: 0
Optimizer mode: ALL_ROWS
Parsing user id: 27
Rows Row Source Operation
28952 TABLE ACCESS BY INDEX ROWID EDIDC (cr=8505 pr=0 pw=0 time=202797 us)
28952 INDEX RANGE SCAN EDIDC~1 (cr=1457 pr=0 pw=0 time=29112 us)(object id 202995)
Elapsed times include waiting on following events:
Event waited on Times Max. Wait Total Waited
---------------------------------------- Waited ---------- ------------
SQL*Net message to client 174899 0.00 0.16
SQL*Net more data to client 155767 0.01 5.69
SQL*Net message from client 174899 0.11 208.21
latch: cache buffers chains 2 0.00 0.00
latch free 4 0.00 0.00
********************************************************************************user4566776 wrote:
My analysis on a particular job trace file drew my attention towards:
1) High rate of Parses instead of Bind variables usage.
But if you look at the text you are using bind variables.
The first query is executed 239 times - which matches the 239 fetches. You cut off some of the useful information from the tkprof output, but the figures show that you're executing more than once per parse call. The time is CPU time spent using a bad execution plan to find no data -- this looks like a bad choice of index, possibly a side effect of the first_rows(1) hint.
2) High fetches and poor number/ low number of rows being processedThe second query is doing a lot of fetches because in 163 executions it is fetching 4.7 million rows at roughly 25 rows per fetch. You might improve performance a little by increasing the array fetch size - but probably not by more than a factor of 2.
You'll notice that even though you record 163 parse calls for the second statement the number of " Misses in library cache during parse" is zero - so the parse calls are pretty irrelevant, the cursor is being re-used.
Regards
Jonathan Lewis
http://jonathanlewis.wordpress.com
http://www.jlcomp.demon.co.uk
To post code, statspack/AWR report, execution plans or trace files, start and end the section with the tag {noformat}{noformat} (lowercase, curly brackets, no spaces) so that the text appears in fixed format.
"Science is more than a body of knowledge; it is a way of thinking"
Carl Sagan -
Performance degradation encountered while running BOE in clustered set up
Problem Statement:
We have a clustered BOE set up in Production with 2 CMS servers (named boe01 and boe02) . Mantenix application (Standard J2EE application in a clustered set up) points to these BOE services hosted on virtual machines to generate reports. As soon as BOE services on both boe01 and boe02 are up and running , performance degradation is observed i.e (response times varies from 7sec to 30sec) .
The same set up works fine when BOE services on boe02 is turned off i.e only boe01 is up and running.No drastic variation is noticed.
BOE Details : SAP BusinessObjects environment XIR2 SP3 running on Windows 2003 Servers.(Virtual machines)
Possible Problem Areas as per our analysis
1) Node 2 Virtual Machine Issue:
This currently being part of the Production infrastructure, any problem assessment testing is not possible.
2) BOE Configuration Issue
Comparison report to check the build between BOE 01 and BOE 02 - Support team has confirmed no major installation differences apart from a minor Operating System setting difference.Question being is there some configuration/setting that we are missing ?
3) Possible BOE Cluster Issue:
Tests in staging environment ( with a similar clustered BOE setup ) have proved inconclusive.
We require your help in
- Root cause Analysis for this problem.
- Any troubleshooting action henceforth.
Another observation from our Weblogic support engineers for the above set up which may or may not be related to the problem is mentioned below.
When the services on BOE_2 are shutdown and we try to fetch a particular report from BOE_1 (Which is running), the following WARNING/ERROR comes up:-
07/09/2011 10:22:26 AM EST> <WARN> <com.crystaldecisions.celib.trace.d.if(Unknown Source)> - getUnmanagedService(): svc=BlockingReportSourceRepository,spec=aps<BOE_1> ,cluster:@BOE_OLTP, kind:cacheserver, name:<BOE_2>.cacheserver.cacheserver, queryString:null, m_replaceable:true,uri=osca:iiop://<BOE_1>;SI_SESSIONID=299466JqxiPSPUTef8huXO
com.crystaldecisions.thirdparty.org.omg.CORBA.TRANSIENT: attempt to establish connection failed: java.net.ConnectException: Connection timed out: connect minor code: 0x4f4f0001 completed: No
at com.crystaldecisions.thirdparty.com.ooc.OCI.IIOP.Connector_impl.connect(Connector_impl.java:150)
at com.crystaldecisions.thirdparty.com.ooc.OB.GIOPClient.createTransport(GIOPClient.java:233)
at com.crystaldecisions.thirdparty.com.ooc.OB.GIOPClientWorkersPool.next(GIOPClientWorkersPool.java:122)
at com.crystaldecisions.thirdparty.com.ooc.OB.GIOPClient.getWorker(GIOPClient.java:105)
at com.crystaldecisions.thirdparty.com.ooc.OB.GIOPClient.startDowncall(GIOPClient.java:409)
at com.crystaldecisions.thirdparty.com.ooc.OB.Downcall.preMarshalBase(Downcall.java:181)
at com.crystaldecisions.thirdparty.com.ooc.OB.Downcall.preMarshal(Downcall.java:298)
at com.crystaldecisions.thirdparty.com.ooc.OB.DowncallStub.preMarshal(DowncallStub.java:250)
at com.crystaldecisions.thirdparty.com.ooc.OB.DowncallStub.setupRequest(DowncallStub.java:530)
at com.crystaldecisions.thirdparty.com.ooc.CORBA.Delegate.request(Delegate.java:556)
at com.crystaldecisions.thirdparty.org.omg.CORBA.portable.ObjectImpl._request(ObjectImpl.java:118)
at com.crystaldecisions.enterprise.ocaframework.idl.ImplServ._OSCAFactoryStub.getServices(_OSCAFactoryStub.java:806)
at com.crystaldecisions.enterprise.ocaframework.ServiceMgr.do(Unknown Source)
at com.crystaldecisions.enterprise.ocaframework.ServiceMgr.a(Unknown Source)
at com.crystaldecisions.enterprise.ocaframework.ServiceMgr.getUnmanagedService(Unknown Source)
at com.crystaldecisions.enterprise.ocaframework.AbstractStubHelper.getService(Unknown Source)
at com.crystaldecisions.enterprise.ocaframework.e.do(Unknown Source)
at com.crystaldecisions.enterprise.ocaframework.o.try(Unknown Source)
at com.crystaldecisions.enterprise.ocaframework.o.a(Unknown Source)
at com.crystaldecisions.enterprise.ocaframework.o.a(Unknown Source)
at com.crystaldecisions.enterprise.ocaframework.p.a(Unknown Source)
at com.crystaldecisions.enterprise.ocaframework.ServiceMgr.getManagedService(Unknown Source)
at com.crystaldecisions.sdk.occa.managedreports.ps.internal.a$a.getService(Unknown Source)
at com.crystaldecisions.enterprise.ocaframework.e.do(Unknown Source)
at com.crystaldecisions.enterprise.ocaframework.o.try(Unknown Source)
at com.crystaldecisions.enterprise.ocaframework.o.a(Unknown Source)
at com.crystaldecisions.enterprise.ocaframework.o.a(Unknown Source)
at com.crystaldecisions.enterprise.ocaframework.p.a(Unknown Source)
We see the above warning coming 2 or 3 times before the request is processed and then we see the report. We have checked our config's for the cluster but didn't find anything concrete.
Is this a normal behavior of the software or can we optimize it?
Any assistance that you can provide would be greatRahul,
I have exactly the same problem running BO 3.1 SP3 in a 2 machine cluster on AIX. Exact same full install on both machines. When I take down one of the machines the performance is much better.
An example of the problem now is that when i run the command ./ccm.sh -display -username administrator -password xxx on the either box when they are both up and running, I sometimes receive a timeout error (over 15mins)
If I run SQLplus direct on the boxes to the CMS DB then the response is instant. Tnspings of course shows no problems
When I bring down one of the machines and run the command ./ccm.sh -display again then this brings back results in less than a minute...
I am baffled as to the problem so was wondering if you found anything from your end
Cheers
Chris -
Hi,
I noticed that if you compile your program with jdk1.4.x version of JDK, you will get a performance degradation in your application (if you compare it with compiled code in version jdk1.3.1_02.
Have any one else noticed this degradation of performance in higher version of JDK or it is just a illusion?
Please suggest me.
Thanks!!Which operating system are you using? Windows / Solaris / Linux?
SCJP, SCJD, SCEA, SCWCD, SCBCD
CISSP, PMP, PHR
OCPDBA 8i/9i
http://www.certgear.com -
Performance degradation using Jolt ASP Connectivity for TUXEDO
We have a customer that uses Jolt ASP Connectivity for TUXEDO and is suffering
from a severe performance degradation over time.
Initial response times are fine (1 s.), but they tend to increase to 3 minutes
after some time (well, eh, a day or so).
Data:
- TUXEDO 7.1
- Jolt 1.2.1
- Relatively recent rolling patch installed (so no there are probably no JSH performance
issues and memory leaks as fixed in earlier patches)
The ULOG shows that during the night the JSH instances notice a timeout on behalf
of the client connection and do a forced shutdown of the client:
040911.csu013.cs.kadaster.nl!JSH.234333.1.-2: JOLT_CAT:1185: "INFO: Userid:
[ZZ_Webpol], Clientid: [AP_WEBSRV3] timed out due to inactivity"
040911.csu013.cs.kadaster.nl!JSH.234333.1.-2: JOLT_CAT:1198: "WARN: Forced
shutdown of client; user name 'ZZ_Webpol'; client name 'AP_WEBSRV3'"
This happens every 10 minutes as per configuration of the JSL (-T flag).
The customer "solved" the problem for the time being by increasing the connection
pool size on the IIS web server.
However, they didn't find a "smoking gun" - no definite cause for the problem.
So, it is debatable whether their "solution" suffices.
It is my suspicion the problem might be located in the Jolt ASP classes running
on the IIS.
Maybe the connection pool somehow loses connections over time, causing subsequent
users having to queue before they get served (although an exception should be
raised if no connections are available).
However, there's no documentation on the functioning of the connection pool for
Jolt ASP.
My questions:
1) What's the algorithm used for managing connections with Jolt ASP for TUXEDO?
2) If connections are terminated by a JSH, will a new connection be established
from the web server automatically? (this is especially interesting, because the
connection policy can be configured in the JSL CLOPT, but there's no info on how
this should be handled/configured by Jolt ASP connectivity for TUXEDO)
Regards,
Winfried ScheuldermanHi,
For ASP connectivity I would suggest looking at the .Net client facility provided in Tuxedo 9.1 and later.
Regards,
Todd Little
Oracle Tuxedo Chief Architect -
Performance Degradation after implementing SQLNET encryption
Hello Everyone...
We are in the process of implementing SQLNET encryption.
As apart of POC.. we were performing test runs.. our appdev person noticed 3x degradation while retriving "CLOB" data over sqlnet encryption.
Here are the current sqlnet settings...
## SQLNET ENCRYPTION DETAILS
#SQLNET.ENCRYPTION_SERVER = required
#SQLNET.CRYPTO_SEED = 'ksfksoiewns324ssfahne'
#SQLNET.ENCRYPTION_TYPES_SERVER= (AES256,AES192)
#SQLNET.CRYPTO_CHECKSUM_SERVER = required
#SQLNET.CRYPTO_CHECKSUM_TYPES_SERVER = (MD5)
, I see about 3x slower performance when looping over clobs when sqlnet encryption is on in CBTS environment. I ran the test from usoh2sxutl001 connecting to shoppingasmstg-scan.cxloyalty.com:1521:shopping using a standalone java test. Each iteration loops over 1000 rows with clobs returning a total of 1343833 bytes; total time for 10 iterations was 3290 ms with encryption on while 1035 ms with it off. The performance for just looping over strings with only 7004 bytes was fine.
usoh2sxutl001:/home/gfishman> /opt/web/jdk/bin/java -classpath ./test/ojdbc5.jar:./test/classes12.jar:./test/:. SqlNetPerformanceTest 10 OFFER_ID
usoh2sxutl001:/home/gfishman> /opt/web/jdk/bin/java -classpath ./test/ojdbc5.jar:./test/classes12.jar:./test/:. SqlNetPerformanceTest 10 DISCLAIMER
From utility box:
No SQLNET:
Prepared statement and executed query in 13 for select OFFER_ID from cata_ag.xtend_offer where disclaimer is not null and length(disclaimer)>1000 and rownum<=1000
Looped over results in 61 with total size 7004
Total time for iterations 10: 3088
Total resultset looping time for iterations 10: 593
usoh2sxutl001:/home/gfishman>
Prepared statement and executed query in 10 for select DISCLAIMER from cata_ag.xtend_offer where disclaimer is not null and length(disclaimer)>1000 and rownum<=1000
Looped over results in 100 with total size 1343833
Total time for iterations 10: 3485
Total resultset looping time for iterations 10: 1035
usoh2sxutl001:/home/gfishman>
SQLNET:
Prepared statement and executed query in 10 for select OFFER_ID from cata_ag.xtend_offer where disclaimer is not null and length(disclaimer)>1000 and rownum<=1000
Looped over results in 57 with total size 7004
Total time for iterations 10: 4710
Total resultset looping time for iterations 10: 580
Prepared statement and executed query in 11 for select DISCLAIMER from cata_ag.xtend_offer where disclaimer is not null and length(disclaimer)>1000 and rownum<=1000
Looped over results in 194 with total size 1343833
Total time for iterations 10: 6072
Total resultset looping time for iterations 10: 3290
usoh2sxutl001:/home/gfishman>
Can you please advise if there is something wrong with the sqlnet settings or what can be done to get the performance back to normal?
Thanks,
Raghu Yella1. What is DB version?
2. What OS do you use?
3. What was the CPU load during nosqlnet and sqlnet phases? -
KNOWN ISSUES 3513544: Performance degradation...
I see that version 3.1 of the Microsoft Drivers for PHP for SQL Server was published on 12/12/2014 and is available on
http://www.microsoft.com/en-us/download/details.aspx?id=20098. Thank you Microsoft...
One thing that bothered me though is the "Known issue" described at the end of the release.txt file included in the SQLSRV31.EXE package:
KNOWN ISSUES
"3513544: Performance degradation when using Microsoft Drivers 3.1 for PHP for SQL Server with Windows 7/Windows Server 2008 R2 and previous versions. Clients connecting to supported versions of Microsoft SQL Server may notice decreased performance when
opening and closing connections in a Windows 7/Windows Server 2008 R2 environment. The recommended course of action is to upgrade to Windows 8/Windows Server 2012 or later."
Has anybody experienced that "decreased performance when opening and closing connections" problem on Windows Server 2008 R2? If you have, how bad is it?
And are there any solutions - other than the "recommended course of action" ("upgrade to Windows 8/Windows Server 2012 or later")? In a corporate environment upgrading a OS isn't always a simple thing that you do in a few minutes. It can
take weeks or months of planning and testing...As I googled, apparently there are less articles mentioned this issue. On the worst surmise， MS may just drive you to upgrade :P
I don't find a specific document on this, this may be a better question on a dedicated PHP forum. -
Severe performance degradation vs Mavericks
Hi I have a MacBook Pro (Retina, 13-inch, Late 2012) 2.5 GHz Intel Core i58 GB 1600 MHz DDR3 Intel HD Graphics 4000 1024 MB and after upgrading to Yosemite I noticed a significant performance degradation: overall the system is not as smooth as it used to me, even resizing a Safari window is "choppy".
I am disappointed.I can't believe Apple have made this software available to the masses when it's clearly not ready. Since "upgrading" my Mac mini has been pretty useless. Programs take a substantially increased time to open compared to Mavericks, and then performance is poor at best. Opening files in Photoshop, for example, is painfully slow and I get the colour wheel almost all of the time - something which definitely didn't happen with Mavericks.
Aside from this, I've experienced a number of frustrating bugs today. When I open a new program on my left screen the right screen is changed to a fresh desktop. Why? When I turn my Mac on I get the login screen on the left monitor (as it always used to) but then the primary desktop is set to the right and I've been unable to keep the correct setting so far (it forgets that I've changed it following a reboot). The background of the top bar keeps disappearing so all of the icons, time, etc. just sit on top of the desktop background.
I hope Apple can release a fix, and quickly. -
Performance degradation with addition of unicasting option
We have been using the multi-casting protocol for setting up the data grid between the application nodes with the vm arguments as
*-Dtangosol.coherence.clusteraddress=${Broadcast Address} -Dtangosol.coherence.clusterport=${Broadcast port}*
As the certain node in the application was expected in a different sub net and multi-casting was not feasible, we opted for well known addressing with following additional VM arguments setup in the server nodes(all in the same subnet)
*-Dtangosol.coherence.machine=${server_name} -Dtangosol.coherence.wka=${server_ip} -Dtangosol.coherence.localport=${server_port}*
and the following in the remote client node that point to one of the server node like this
*-Dtangosol.coherence.wka=${server_ip} -Dtangosol.coherence.wka.port=${server_port}*
But this deteriorated the performance drastically both in pushing data into the cache and getting events via map listener.
From the coherence logging statements it doesn't seems that multi-casting is getting used atleast with in the server nodes(which are in the same subnet).
Is it feasible to have both uni-casting and multi-casting to coexist? How to verify if it is setup already?
Is performance degradation in well-known addressing is a limitation and expected?Hi Mahesh,
From your description it sounds as if you've configured each node with a wka list just including it self. This would result in N rather then 1 clusters. Your client would then be serviced by the resources of just a single cache server rather then an entire cluster. If this is the case you will see that all nodes are identified as member 1. To setup wka I would suggest using the override file rather then system properties, and place perhaps 10% of your nodes on that list. Then use this exact same file for all nodes. If I've misinyerpreted your configuration please provide additional details.
Thanks,
Mark
Oracle Coherence -
Performance degradation with -g compiler option
Hello
Our mearurement of simple program compiled with and without -g option shows big performance difference.
Machine:
SunOS xxxxx 5.10 Generic_137137-09 sun4u sparc SUNW,Sun-Fire-V250
Compiler:
CC: Sun C++ 5.9 SunOS_sparc Patch 124863-08 2008/10/16
#include "time.h"
#include <iostream>
int main(int argc, char ** argv)
for (int i = 0 ; i < 60000; i++)
int *mass = new int[60000];
for (int j=0; j < 10000; j++) {
mass[j] = j;
delete []mass;
return 0;
}Compilation and execution with -g:
CC -g -o test_malloc_deb.x test_malloc.c
ptime test_malloc_deb.xreal 10.682
user 10.388
sys 0.023
Without -g:
CC -o test_malloc.x test_malloc.c
ptime test_malloc.xreal 2.446
user 2.378
sys 0.018
As you can see performance degradation of "-g" is about 4 times.
Our product is compiled with -g option and before shipment it is stripped using 'strip' utility.
This will give us possibility to open customer core files using non-stripped exe.
But our tests shows that stripping does not give performance of executable compiled without '-g'.
So we are losing performance by using this compilation method.
Is it expected behavior of compiler?
Is there any way to have -g option "on" and not lose performance?In your original compile you don't use any optimisation flags, which tells the compiler to do minimal optimisation - you're basically telling the compiler that you are not interested in performance. Adding -g to this requests that you want maximal debug. So the compiler does even less optimisation, in order that the generated code more closely resembles the original source.
If you are interested in debug, then -g with no optimisation flags gives you the most debuggable code.
If you are interested in optimised code with debug, then try -O -g (or some other level of optimisation). The code will still be debuggable - you'll be able to map disassembly to lines of source, but some things may not be accessible.
If you are using C++, then -g will in SS12 switch off front-end inlining, so again you'll get some performance hit. So use -g0 to get inlining and debug.
HTH,
Darryl. -
Performance degradation factor 1000 on failover???
Hi,
we are gaining first experience with WLS 5.1 EBF 8 clustering on
NT4 SP 6 workstation.
We have two servers in the cluster, both on same machine but with
different IP adresses (as it has to be)!
In general it seems to work: we have a test client connecting to
one of the servers and
uses a stateless test EJB which does nothing but writing into weblogic.log.
When this server fails, the other server resumes to work the client
requests, BUT VERY VERY VERY SLOW!!!
- I should repeat VERY a thousand times, because a normal client
request takes about 10-30 ms
and after failure/failover it takes 10-15 SECONDS!!!
As naive as I am I want to know: IS THIS NORMAL?
After the server is back, the performance is also back to normal,
but we were expecting a much smaller
performance degradation.
So I think we are doing something totally wrong!
Do we need some Network solution to make failover performance better?
Or is there a chance to look closer at deployment descriptors or
weblogic.system.executeThreadCount
or weblogic.system.percentSocketReaders settings?
Thanks in advance for any help!
Fleming
See http://www.weblogic.com/docs51/cluster/setup.html#680201
Basically, the rule of thumb is to set the number of execute threads ON
THE CLIENT to 2 times the number of servers in the cluster and the
percent socket readers to 50%. In your case with 8 WLS instances in the
cluster, add the following to the java command line used to start your
client:
-Dweblogic.system.executeThreadCount=16
-Dweblogic.system.percentSocketReaders=50
Hope this helps,
Robert
Fleming Frese wrote:
> Hi Mike,
>
> thanks for your reply.
>
> We do not have HTTP clients or Servlets, just EJBs and clients
> in the same LAN,
> and the failover should be handled by the replica-aware stubs.
> So we thought we need no Proxy solution for failover. Maybe we
> need a DNS to serve failover if this
> increases our performance?
>
> The timeout clue sounds reasonable, but I would expect that the
> stub times out once and than switches
> to the other server for subsequent requests. There should be a
> refresh (after 3 Minutes?) when the stub
> gets new information about the servers in the cluster, so he could
> check then if the server is back.
> This works perfectly with load balancing: If a new server joins
> the cluster, I automatically receives
> requests after a while.
>
> Fleming
>
> "Mike Reiche" <[email protected]> wrote:
> >
> >It sounds like every request is first timing out it's
> >connection
> >attempt (10 seconds, perhaps?) on the 'down' instance
> >before
> >trying the second instance. How do requests 'failover'?
> >Do you
> >have Netscape, Apache, or IIS with a wlproxy module? Or
> >do
> >you simply have a DNS that takes care of that?
> >
> >Mike
> >
> >
> >
> >"Fleming Frese" <[email protected]> wrote:
> >>
> >>Hi,
> >>
> >>we are gaining first experience with WLS 5.1 EBF 8 clustering
> >>on
> >>NT4 SP 6 workstation.
> >>We have two servers in the cluster, both on same machine
> >>but with
> >>different IP adresses (as it has to be)!
> >>
> >>In general it seems to work: we have a test client connecting
> >>to
> >>one of the servers and
> >>uses a stateless test EJB which does nothing but writing
> >>into weblogic.log.
> >>
> >>When this server fails, the other server resumes to work
> >>the client
> >>requests, BUT VERY VERY VERY SLOW!!!
> >> - I should repeat VERY a thousand times, because a normal
> >>client
> >>request takes about 10-30 ms
> >>and after failure/failover it takes 10-15 SECONDS!!!
> >>
> >>As naive as I am I want to know: IS THIS NORMAL?
> >>
> >>After the server is back, the performance is also back
> >>to normal,
> >>but we were expecting a much smaller
> >>performance degradation.
> >>
> >>So I think we are doing something totally wrong!
> >>Do we need some Network solution to make failover performance
> >>better?
> >>Or is there a chance to look closer at deployment descriptors
> >>or
> >>weblogic.system.executeThreadCount
> >>or weblogic.system.percentSocketReaders settings?
> >>
> >>Thanks in advance for any help!
> >>
> >>Fleming
> >>
> >
-
Performance degradation: unfetched field [PublishingPageContent] caused extra roundtrip
Hi All,
I am facing some serious application pool crash in one of my customer's Production site SharePoint servers. The Application Error logs in the event Viewer says -
Faulting application name: w3wp.exe, version: 7.5.7601.17514, time stamp: 0x4ce7afa2
Faulting module name: ntdll.dll, version: 6.1.7601.17514, time stamp: 0x4ce7c8f9
Exception code: 0xc0000374
Fault offset: 0x00000000000c40f2
Faulting process id: 0x1414
Faulting application start time: 0x01ce5edada76109d
Faulting application path: c:\windows\system32\inetsrv\w3wp.exe
Faulting module path: C:\Windows\SYSTEM32\ntdll.dll
Report Id: 5a69ec1e-cace-11e2-9be2-441ea13bf8be
At the same time the SharePoint ULS logs says -
1)
06/13/2013 03:44:29.53 w3wp.exe (0x0808) 0x2DF0 SharePoint Foundation
General 8e2s
Medium Unknown SPRequest error occurred. More information: 0x80070005 8b343224-4aa6-490c-8a2a-ce06ac160773
06/13/2013 03:44:35.03 w3wp.exe (0x0808) 0x2DF0 SharePoint Foundation
General
8e25 Medium Failed to look up string with key "FSAdmin_SiteSettings_UserContextManagement_ToolTip", keyfile Microsoft.Office.Server.Search.
8b343224-4aa6-490c-8a2a-ce06ac160773
06/13/2013 03:44:35.03 w3wp.exe (0x0808) 0x2DF0 SharePoint Foundation
General 8l3c
Medium Localized resource for token 'FSAdmin_SiteSettings_UserContextManagement_ToolTip' could not be found for file with path: "C:\Program Files\Common Files\Microsoft Shared\Web
Server Extensions\14\Template\Features\SearchExtensions\ExtendedSearchAdminLinks.xml". 8b343224-4aa6-490c-8a2a-ce06ac160773
2)
06/13/2013 03:44:29.01 w3wp.exe (0x0808) 0x2DF0 SharePoint Foundation
Web Parts
emt4 High Error initializing Safe control - Assembly:Microsoft.Office.SharePoint.ClientExtensions, Version=14.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c TypeName: Microsoft.Office.SharePoint.ClientExtensions.Publishing.TakeListOfflineRibbonControl
Error: Could not load type 'Microsoft.Office.SharePoint.ClientExtensions.Publishing.TakeListOfflineRibbonControl' from assembly 'Microsoft.Office.SharePoint.ClientExtensions, Version=14.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c'.
8b343224-4aa6-490c-8a2a-ce06ac160773
06/13/2013 03:44:29.50 w3wp.exe (0x0808)
0x2DF0 SharePoint Foundation Logging Correlation Data
xmnv Medium Site=/ 8b343224-4aa6-490c-8a2a-ce06ac160773
3)
06/13/2013 03:43:59.67 w3wp.exe (0x263C) 0x24D8 SharePoint Foundation
Performance 9fx9
Medium Performance degradation: unfetched field [PublishingPageContent] caused extra roundtrip. at Microsoft.SharePoint.SPListItem.GetValue(SPField fld,
Int32 columnNumber, Boolean bRaw, Boolean bThrowException) at Microsoft.SharePoint.SPListItem.GetValue(String strName, Boolean bThrowException) at Microsoft.SharePoint.SPListItem.get_Item(String fieldName)
at Microsoft.SharePoint.WebControls.BaseFieldControl.get_ItemFieldValue() at Microsoft.SharePoint.Publishing.WebControls.RichHtmlField.RenderFieldForDisplay(HtmlTextWriter output) at Microsoft.SharePoint.WebControls.BaseFieldControl.Render(HtmlTextWriter
output) at Microsoft.SharePoint.Publishing.WebControls.BaseRichField.Render(HtmlTextWriter output) at Microsoft.SharePoint.Publishing.WebControls.RichHtmlField.R...
b8d0b8ca-8386-441f-8fce-d79fe72556e1
06/13/2013 03:43:59.67* w3wp.exe (0x263C)
0x24D8 SharePoint Foundation Performance
9fx9 Medium ...ender(HtmlTextWriter output) at System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection
children) at System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) at System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children)
at System.Web.UI.HtmlControls.HtmlContainerControl.Render(HtmlTextWriter writer) at System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) at System.Web.UI.HtmlControls.HtmlForm.RenderChildren(HtmlTextWriter
writer) at System.Web.UI.HtmlControls.HtmlForm.Render(HtmlTextWriter output) at System.Web.UI.HtmlControls.HtmlForm.RenderControl(HtmlTextWriter writer) at System.Web.UI.Control.RenderChildrenInternal(HtmlTextWrit...
b8d0b8ca-8386-441f-8fce-d79fe72556e1
06/13/2013 03:43:59.67* w3wp.exe (0x263C)
0x24D8 SharePoint Foundation Performance
9fx9 Medium ...er writer, ICollection children) at System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer,
ICollection children) at System.Web.UI.Page.Render(HtmlTextWriter writer) at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
at System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) at System.Web.UI.Page.ProcessRequest() at System.Web.UI.Page.ProcessRequest(HttpContext context)
at Microsoft.SharePoint.Publishing.TemplateRedirectionPage.ProcessRequest(HttpContext context) at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() at System.Web.HttpApplication.ExecuteStep(IExecutionSte...
b8d0b8ca-8386-441f-8fce-d79fe72556e1
06/13/2013 03:43:59.67* w3wp.exe (0x263C)
0x24D8 SharePoint Foundation Performance
9fx9 Medium ...p step, Boolean& completedSynchronously) at System.Web.HttpApplication.PipelineStepManager.ResumeSteps(Exception
error) at System.Web.HttpApplication.BeginProcessRequestNotification(HttpContext context, AsyncCallback cb) at System.Web.HttpRuntime.ProcessRequestNotificationPrivate(IIS7WorkerRequest wr, HttpContext context)
at System.Web.Hosting.PipelineRuntime.ProcessRequestNotificationHelper(IntPtr managedHttpContext, IntPtr nativeRequestContext, IntPtr moduleData, Int32 flags) at System.Web.Hosting.PipelineRuntime.ProcessRequestNotification(IntPtr managedHttpContext,
IntPtr nativeRequestContext, IntPtr moduleData, Int32 flags) at System.Web.Hosting.PipelineRuntime.ProcessRequestNotificationHelper(IntPtr managedHttpContext, IntPtr nativeRequestContext, IntPtr module...
b8d0b8ca-8386-441f-8fce-d79fe72556e1
06/13/2013 03:43:59.67* w3wp.exe (0x263C)
0x24D8 SharePoint Foundation Performance
9fx9 Medium ...Data, Int32 flags) at System.Web.Hosting.PipelineRuntime.ProcessRequestNotification(IntPtr managedHttpContext,
IntPtr nativeRequestContext, IntPtr moduleData, Int32 flags) b8d0b8ca-8386-441f-8fce-d79fe72556e1
06/13/2013 03:43:59.67 w3wp.exe (0x263C)
0x24D8 SharePoint Foundation Performance g4zd
High Performance degradation: note field [PublishingPageContent] was not in demoted fields. b8d0b8ca-8386-441f-8fce-d79fe72556e1
Anybody has any idea whats going on? I need to fix this ASAP as we are suppose to go live in next few days.
SoumalyaHello Soumalya,
Do you have an update on your issue? We are actually experiencing a similar issue at a new customer.
- Dennis | Netherlands | Blog |
Twitter -
Performance Degradation with EJBs
I have a small J2EE application that consists of a Session EJB calling 3 Entity EJBs that access the database. It is a simple Order capture application. The 3 Entity beans are called Orders, OrderItems and Inventory.
A transaction consists of inserting a record into the order table, inserting 5 records into the orderitems table and updating the quantity field in the inventory table for each order item in an order. With this transaction I observe performance degradation as the transactions per second decreases dramatically within 5 minutes of running.
When I modify the transaction to insert a single record into the orderitems table I do not observe performance degradation. The only difference in this transaction is we go through the for loop 1 time as opposed to 5 times. The code is exactly the same as in the previous case with 5 items per order.
Therefore I believe the problem is a performance degradation on Entity EJBs that
get invoked in a loop.
I am using OC4J 10.1.3.3.
I am using CMP (Container Managed Persistence) and CMT (Container Managed Transactions). The Entity EJBs were all generated by Oracle JDeveloper.
EJB version being used is 2.1.One thing to consider it downloading and using the Oracle AD4J utility to see if it can help you identify any possible bottlenecks, on the application server or the database.
AD4J can be used to monitor/profile/trace applications in real time with no instrumentation required on the application. Just install it into the container and go. It can even trace a request from the app server down into the database and show you the situation is down there (it needs a db agent installed to do that).
Overview:
http://www.oracle.com/technology/products/oem/pdf/wp_productionappdiagnostics.pdf
Download:
http://www.oracle.com/technology/software/products/oem/htdocs/jade.html
Install/Config Guide:
http://download.oracle.com/docs/cd/B16240_01/doc/install.102/e11085/toc.htm
Usage Scenarios:
http://www.oracle.com/technology/products/oem/pdf/oraclead4j_usagescenarios.pdf -
Performance Degradation from SSL
I have read articles which are showing that performance could go down to
1/10 with certain servers (Reference
http://isglabs.rainbow.com/isglabs/shperformance/SHPerformance.html) when
using SSL.
I am cuurently using WebLogic 4.5. Can anybody tell me what kind of
performance degradation would I see if I switch all my transactions from
normal unsecure http transactions to secure ones (SSL V3)?
Any help appreciated.
best regards, AndreasAndreas,
Internal benchmarks (unofficial) have shown SSL to be 65-80% slower than
typical connections. So, anywhere between 3 to 5 times slower. This is the
same across all http servers.
In Denali (the next release), we're adding a performance pack enhancement
that includes native code impls of some of our crypto code. This should
show large speedups when it's released in March.
Thanks!
Michael Girdley
Sr. Product Manager
WebLogic Server
BEA Systems
ph. 415.364.4556
[email protected]
Andreas Rudolf <[email protected]> wrote in message
news:820bv6$br6$[email protected]..
I have read articles which are showing that performance could go down to
1/10 with certain servers (Reference
http://isglabs.rainbow.com/isglabs/shperformance/SHPerformance.html) when
using SSL.
I am cuurently using WebLogic 4.5. Can anybody tell me what kind of
performance degradation would I see if I switch all my transactions from
normal unsecure http transactions to secure ones (SSL V3)?
Any help appreciated.
best regards, Andreas
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