Performance problems with new Java Tiger style recommendations

Performance problems with jdk 1.5 on Linux plattform
(not tested on Windows, might be the same)
using the new style recommendations.
I need fast Vector loops for high speed mathematical calculations, some
hints about the fastest way to program that loop would be also great!
After refactoring using the new features from java 1.5 (as recommended from
SUN) I lost performance significantly:
using a vector:
public Vector<unit> units;
The new code (recommended from SUN for Java Tiger for redesign):
for (unit u: units) u.accumulate();
runs more than 30% slower than the old code:
for (int i = 0; i < units.size(); i++) units.elementAt(i).accumulate();
I expected the opposite.
Is there any information available that helps?
The following additional information I got from Mr. Shankar Unni:
I got some fairly anomalous results comparing ArrayList and Vector: for the
1.5-style loops, ArrayList was faster then Vector, but for a loop with get()
calls, Vector was faster. Vector was even faster than that using
elementAt(), which was a surprise:
For a million summing iterations over a 100-element array:
vector elementAt loop took 3446 ms.
vector get loop took 3796 ms.
vector iterator loop took 5469 ms.
arraylist get loop took 4136 ms.
arraylist iterator loop took 4668 ms.

If your topic doesn't change, please stay in your original post.

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Performance problem with sdn_nn - new 10g install

I am having a performance problem with sdn_nn after migrating to a new machine. The old Oracle version was 9.0.1.4. The new is 10g. The new machine is faster in general. Most (non-spatial) batch processes run in half the time. However, the below statement is radically slower. The below statement ran in 45 minutes before. On the new machine it hasn't finished after 10 hours. I am able to get a 5% sample of the customers to finish in 45 minutes.
Does anyone have any ideas on how to approach this problem? Any chance something isn't installed correctly on the new machine (the nth version of the query finishe, albeit 20 times slower)?
Appreciate any help. Thanks.
- Jack
create table nearest_store
as
select /*+ ordered */
a.customer_id,
b.store_id nearest_store,
round(mdsys.sdo_nn_distance(1),4) distance
from customers a,
stores b
where mdsys.sdo_nn(
b.geometry,
a.geometry,
'sdo_num_res=1, unit=mile',
1
) = 'TRUE'
;

Dan,
customers 110,000 (involved in this query)
stores 28,000
Here is the execution plan on the current machine:
CREATE TABLE STATEMENT cost = 81947
LOAD AS SELECT
PX COORDINATOR
PX SEND QC (RANDOM) :TQ10000
ROW NESTED LOOPS
1 1 PX BLOCK ITERATOR
1 1ROW TABLE ACCESS FULL CUSTOMERS
1 3 PARTITION RANGE ALL
1 3 TABLE ACCESS BY LOCAL INDEX ROWID STORES
DOMAIN INDEX STORES_SIDX
I can't capture the execution plan on the old database. It is gone. I don't remember it being any different from the above (full scan customers, probe stores index once for each row in customers).
I am trying the query without the create table (just doing a count). I'll let you know on that one.
I am at 10.0.1.3.
Here is how I created the index:
create index stores_sidx
on stores(geometry)
indextype is mdsys.spatial_index LOCAL
Note that the stores table is partitioned by range on store type. There are three store types (each in its own partition). The query returns the nearest store of each type (three rows per customer). This is by design (based on the documented behavior of sdo_nn).
In addition to running the query without the CTAS, I am also going try running it on a different machine tonight. I let you know how that turns out.
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"If you intend to use Oracle JVM or Oracle interMedia, you must install the Oracle Database 10g Products installation type from the Companion CD. This installation optimizes the performance of those products on your system."
And, the Database Installlation Guide says:
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Based on that, I am suspicious that maybe I have the product installed on the new machine, but not correctly (forgot to set fast=true).
Let me know if you think of anything else you'd like to see. Thanks.
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Performance problems with jdk 1.5 on Linux plattform

Performance problems with jdk 1.5 on Linux plattform
(not tested on Windows, might be the same)
After refactoring using the new features from java 1.5 I lost
performance significantly:
public Vector<unit> units;
The new code:
for (unit u: units) u.accumulate();
runs more than 30% slower than the old code:
for (int i = 0; i < units.size(); i++) units.elementAt(i).accumulate();
I expected the opposite.
Is there any information available that helps?

Here's the complete benchmark code I used:package test;
import java.text.NumberFormat;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.Vector;
public class IterationPerformanceTest {
     private int m_size;
     public IterationPerformanceTest(int size) {
          m_size = size;
     public long getArrayForLoopDuration() {
          Integer[] testArray = new Integer[m_size];
          for (int item = 0; item < m_size; item++) {
               testArray[item] = new Integer(item);
          StringBuilder builder = new StringBuilder();
          long start = System.nanoTime();
          for (int index = 0; index < m_size; index++) {
               builder.append(testArray[index]);
          long end = System.nanoTime();
          System.out.println(builder.length());
          return end - start;
     public long getArrayForEachDuration() {
          Integer[] testArray = new Integer[m_size];
          for (int item = 0; item < m_size; item++) {
               testArray[item] = new Integer(item);
          StringBuilder builder = new StringBuilder();
          long start = System.nanoTime();
          for (Integer item : testArray) {
               builder.append(item);
          long end = System.nanoTime();
          System.out.println(builder.length());
          return end - start;
     public long getArrayListForLoopDuration() {
          ArrayList<Integer> testList = new ArrayList<Integer>();
          for (int item = 0; item < m_size; item++) {
               testList.add(item);
          StringBuilder builder = new StringBuilder();
          long start = System.nanoTime();
          for (int index = 0; index < m_size; index++) {
               builder.append(testList.get(index));
          long end = System.nanoTime();
          System.out.println(builder.length());
          return end - start;
     public long getArrayListForEachDuration() {
          ArrayList<Integer> testList = new ArrayList<Integer>();
          for (int item = 0; item < m_size; item++) {
               testList.add(item);
          StringBuilder builder = new StringBuilder();
          long start = System.nanoTime();
          for (Integer item : testList) {
               builder.append(item);
          long end = System.nanoTime();
          System.out.println(builder.length());
          return end - start;
     public long getArrayListIteratorDuration() {
          ArrayList<Integer> testList = new ArrayList<Integer>();
          for (int item = 0; item < m_size; item++) {
               testList.add(item);
          StringBuilder builder = new StringBuilder();
          long start = System.nanoTime();
          Iterator<Integer> iterator = testList.iterator();
          while(iterator.hasNext()) {
               builder.append(iterator.next());
          long end = System.nanoTime();
          System.out.println(builder.length());
          return end - start;
     public long getLinkedListForLoopDuration() {
          LinkedList<Integer> testList = new LinkedList<Integer>();
          for (int item = 0; item < m_size; item++) {
               testList.add(item);
          StringBuilder builder = new StringBuilder();
          long start = System.nanoTime();
          for (int index = 0; index < m_size; index++) {
               builder.append(testList.get(index));
          long end = System.nanoTime();
          System.out.println(builder.length());
          return end - start;
     public long getLinkedListForEachDuration() {
          LinkedList<Integer> testList = new LinkedList<Integer>();
          for (int item = 0; item < m_size; item++) {
               testList.add(item);
          StringBuilder builder = new StringBuilder();
          long start = System.nanoTime();
          for (Integer item : testList) {
               builder.append(item);
          long end = System.nanoTime();
          System.out.println(builder.length());
          return end - start;
     public long getLinkedListIteratorDuration() {
          LinkedList<Integer> testList = new LinkedList<Integer>();
          for (int item = 0; item < m_size; item++) {
               testList.add(item);
          StringBuilder builder = new StringBuilder();
          long start = System.nanoTime();
          Iterator<Integer> iterator = testList.iterator();
          while(iterator.hasNext()) {
               builder.append(iterator.next());
          long end = System.nanoTime();
          System.out.println(builder.length());
          return end - start;
     public long getVectorForLoopDuration() {
          Vector<Integer> testVector = new Vector<Integer>();
          for (int item = 0; item < m_size; item++) {
               testVector.add(item);
          StringBuilder builder = new StringBuilder();
          long start = System.nanoTime();
          for (int index = 0; index < m_size; index++) {
               builder.append(testVector.get(index));
          long end = System.nanoTime();
          System.out.println(builder.length());
          return end - start;
     public long getVectorForEachDuration() {
          Vector<Integer> testVector = new Vector<Integer>();
          for (int item = 0; item < m_size; item++) {
               testVector.add(item);
          StringBuilder builder = new StringBuilder();
          long start = System.nanoTime();
          for (Integer item : testVector) {
               builder.append(item);
          long end = System.nanoTime();
          System.out.println(builder.length());
          return end - start;
     public long getVectorIteratorDuration() {
          Vector<Integer> testVector = new Vector<Integer>();
          for (int item = 0; item < m_size; item++) {
               testVector.add(item);
          StringBuilder builder = new StringBuilder();
          long start = System.nanoTime();
          Iterator<Integer> iterator = testVector.iterator();
          while(iterator.hasNext()) {
               builder.append(iterator.next());
          long end = System.nanoTime();
          System.out.println(builder.length());
          return end - start;
      * @param args
     public static void main(String[] args) {
          IterationPerformanceTest test = new IterationPerformanceTest(1000000);
          System.out.println("\n\nRESULTS:");
          long arrayForLoop = test.getArrayForLoopDuration();
          long arrayForEach = test.getArrayForEachDuration();
          long arrayListForLoop = test.getArrayListForLoopDuration();
          long arrayListForEach = test.getArrayListForEachDuration();
          long arrayListIterator = test.getArrayListIteratorDuration();
//          long linkedListForLoop = test.getLinkedListForLoopDuration();
          long linkedListForEach = test.getLinkedListForEachDuration();
          long linkedListIterator = test.getLinkedListIteratorDuration();
          long vectorForLoop = test.getVectorForLoopDuration();
          long vectorForEach = test.getVectorForEachDuration();
          long vectorIterator = test.getVectorIteratorDuration();
          System.out.println("Array      for-loop: " + getPercentage(arrayForLoop, arrayForLoop) + "% ("+getDuration(arrayForLoop)+" sec)");
          System.out.println("Array      for-each: " + getPercentage(arrayForLoop, arrayForEach) + "% ("+getDuration(arrayForEach)+" sec)");
          System.out.println("ArrayList for-loop: " + getPercentage(arrayForLoop, arrayListForLoop) + "% ("+getDuration(arrayListForLoop)+" sec)");
          System.out.println("ArrayList for-each: " + getPercentage(arrayForLoop, arrayListForEach) + "% ("+getDuration(arrayListForEach)+" sec)");
          System.out.println("ArrayList iterator: " + getPercentage(arrayForLoop, arrayListIterator) + "% ("+getDuration(arrayListIterator)+" sec)");
//          System.out.println("LinkedList for-loop: " + getPercentage(arrayForLoop, linkedListForLoop) + "% ("+getDuration(linkedListForLoop)+" sec)");
          System.out.println("LinkedList for-each: " + getPercentage(arrayForLoop, linkedListForEach) + "% ("+getDuration(linkedListForEach)+" sec)");
          System.out.println("LinkedList iterator: " + getPercentage(arrayForLoop, linkedListIterator) + "% ("+getDuration(linkedListIterator)+" sec)");
          System.out.println("Vector     for-loop: " + getPercentage(arrayForLoop, vectorForLoop) + "% ("+getDuration(vectorForLoop)+" sec)");
          System.out.println("Vector     for-each: " + getPercentage(arrayForLoop, vectorForEach) + "% ("+getDuration(vectorForEach)+" sec)");
          System.out.println("Vector     iterator: " + getPercentage(arrayForLoop, vectorIterator) + "% ("+getDuration(vectorIterator)+" sec)");
     private static NumberFormat percentageFormat = NumberFormat.getInstance();
     static {
          percentageFormat.setMinimumIntegerDigits(3);
          percentageFormat.setMaximumIntegerDigits(3);
          percentageFormat.setMinimumFractionDigits(2);
          percentageFormat.setMaximumFractionDigits(2);
     private static String getPercentage(long base, long value) {
          double result = (double) value / (double) base;
          return percentageFormat.format(result * 100.0);
     private static NumberFormat durationFormat = NumberFormat.getInstance();
     static {
          durationFormat.setMinimumIntegerDigits(1);
          durationFormat.setMaximumIntegerDigits(1);
          durationFormat.setMinimumFractionDigits(4);
          durationFormat.setMaximumFractionDigits(4);
     private static String getDuration(long nanos) {
          double result = (double)nanos / (double)1000000000;
          return durationFormat.format(result);
}

Performance problem with ojdbc14.jar

Hi,
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Thanks
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My code is doing some thing which might be working well with classes12.zip and which does not work well with ojdbc14.jar? Any general suggestions to make the code better, especially for batch updates.
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if(longCallPStmt == null) {
longCallPStmt = conn.prepareStatement(longCallQuery);
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longCallPStmt.setInt(5, cdrAgg.istateregionid);
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longCallPStmt.setInt(7, cdrAgg.icalltreatmentcode);
longCallPStmt.setInt(8, cdrAgg.icompletioncode);
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rs.getInt(3),
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rs.getInt(7),
rs.getInt(8),
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rs.getInt(10),
rs.getInt(11),
rs.getInt(12),
rs.getInt(13),
rs.getInt(14),
rs.getInt(15),
rs.getInt(16)
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log(Level.INFO, "CdrAggLoader: Loaded "+((cdr_agg==null)?0:1) + " "
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Performance problems with EP 6 and MS IE

Hi everybody,
since a couple of days, we are facing a sever performance problem with our SAP EP 6.0. When I access the system with MS Internet Explorer 6.0, it takes 5-10 minutes after the Login. With Firefox Browser, the performance is ok. Therefore I assume that it must be a problem with the IE settings. Does anybody know a solution?
Best regards,
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There are a few things that this could be. I've seen the setting "Empty Temporary Internet Files folder when browser is closed" cause a lot of performance problems (This is in the advanced settings in your IE).
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Performance problem with Mavericks.

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It would help us to help you if we could have some more technical info about your iMac.
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http://www.etresoft.com/etrecheck
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Thank's in advance for your help
Best regards
Emmanuel

Hi,
My problem is not resolved and I have'nt news from the support.
If you have any idea/info, don't forget me
Thank's in advance
Emmanuel

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Thanks,
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Hi,
I want to open an applet with new java run time envorinment, i.e. i must see 2 java consoles in the windows tray
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how do i make them work in different jvm
Hope i am clear, if not i will explain more in detail
<script language="JavaScript1.2">
function openPlanApplet()
TheNewWin = window.open('AppletTest.htm', '');
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Ashish

HI,
I think i will get 2 consoles, but the problem is the end user will be forced have 2 jvm installed on his machine, also what if i want 3 applets in 3 different envoriment , then
Let me send u some example of what i am trying to do
This is my java Applet, and there are 2 HTML files,
first open test.html and then click button to open the applet window, then click on the button "GO" in applet to change the text of label
, then go back to test.html and again click on the button to open applet u will see that the button text is "change it" instead of "Applet1"
and that is why i want to start a new jvm window to avoid this
Hope this makes sense,
or send me an email at [email protected] and i will send u a zip file of all html and class file for u to test
import java.applet.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.net.*;
public class AppletTest extends JApplet
implements ActionListener
public static String name = "Applet1";
JLabel label;
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JButton b = new JButton("go");
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this.getContentPane().add(label);
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name="Change it";
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<title>Test Screen size</title>
<script language="JavaScript1.2">
var TheNewWin;
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TheNewWin = window.open('AppletTest.html', '', config='height=300, width=300, toolbar=no, menubar=no,scrollbars=no,resizable=no, location=no,directories=no, status=no ,offscreenBuffering=false');
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<html>
<head>
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</head>
<body>
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</body>
</html>
**/

JCoIDoc IDocLibrary 3.0.2 Problems with IDocServerExample.java

Hello, I´m facing a problem with IDocServerExample.java. I created a new project in eclipse, added the package com.sap.conn.idoc.examples and the class IDocServerExample.java. I configured the files "MYSERVER.jcoServer" and "BCE.jcoDestination" and started the application. Then I get the following error messages: *********************************************************************************************************************************************************
com.sap.conn.jco.JCoException: (102) RFC_ERROR_COMMUNICATION: Unable to get repository at com.sap.conn.jco.rt.DefaultServer.update(DefaultServer.java:136) at com.sap.conn.jco.rt.DefaultServer.(DefaultServer.java:105) at com.sap.conn.idoc.jco.DefaultJCoIDocServer.(DefaultJCoIDocServer.java:35) at com.sap.conn.idoc.jco.DefaultJCoIDocServerFactory.createServer(DefaultJCoIDocServerFactory.java:17) at com.sap.conn.idoc.jco.DefaultJCoIDocServerFactory.createServer(DefaultJCoIDocServerFactory.java:13) at com.sap.conn.jco.rt.DefaultServerManager.getServer(DefaultServerManager.java:108) at com.sap.conn.jco.rt.StandaloneServerFactory.getServerInstance(StandaloneServerFactory.java:170) at com.sap.conn.idoc.jco.JCoIDoc.getServer(JCoIDoc.java:78) at com.sap.conn.idoc.examples.IDocServerExample.main(IDocServerExample.java:18) Caused by: com.sap.conn.jco.JCoException: (102) RFC_ERROR_COMMUNICATION: Connect to message server host failed Connection parameters: TYPE=B DEST=JCOSERVER01 MSHOST=arm115tx GROUP=PUBLIC R3NAME=T01 PCS=1 LOCATION CPIC (TCP/IP) on local host rz1462 with Unicode ERROR service '?' unknown TIME Tue Jul 07 09:09:40 200 RELEASE 711 COMPONENT NI (network interface) VERSION 39 RC -3 DETAIL NiErrSet COUNTER 2 at com.sap.conn.jco.rt.MiddlewareJavaRfc.generateJCoException(MiddlewareJavaRfc.java:615) at com.sap.conn.jco.rt.MiddlewareJavaRfc$JavaRfcClient.connect(MiddlewareJavaRfc.java:1280) at com.sap.conn.jco.rt.ClientConnection.connect(ClientConnection.java:661) at com.sap.conn.jco.rt.PoolingFactory.init(PoolingFactory.java:103) at com.sap.conn.jco.rt.ConnectionManager.createFactory(ConnectionManager.java:171) at com.sap.conn.jco.rt.DefaultConnectionManager.createFactory(DefaultConnectionManager.java:44) at com.sap.conn.jco.rt.ConnectionManager.getFactory(ConnectionManager.java:160) at com.sap.conn.jco.rt.RfcDestination.initialize(RfcDestination.java:789) at com.sap.conn.jco.rt.RfcDestination.getSystemID(RfcDestination.java:817) at com.sap.conn.jco.rt.RepositoryManager.getRepository(RepositoryManager.java:32) at com.sap.conn.jco.rt.RfcDestination.getRepository(RfcDestination.java:891) at com.sap.conn.jco.rt.DefaultServer.update(DefaultServer.java:132) ... 8 more Caused by: RfcException: [null] message: Connect to message server host failed Connection parameters: TYPE=B DEST=JCOSERVER01 MSHOST=arm115tx GROUP=PUBLIC R3NAME=T01 PCS=1 LOCATION CPIC (TCP/IP) on local host rz1462 with Unicode ERROR service '?' unknown TIME Tue Jul 07 09:09:40 200 RELEASE 711 COMPONENT NI (network interface) VERSION 39 RC -3 DETAIL NiErrSet COUNTER 2 Return code: RFC_FAILURE(1) error group: 102 key: RFC_ERROR_COMMUNICATION at com.sap.conn.rfc.engine.RfcIoControl.error_end(RfcIoControl.java:255) at com.sap.conn.rfc.engine.RfcIoControl.ab_rfcopen(RfcIoControl.java:94) at com.sap.conn.rfc.api.RfcApi.RfcOpen(RfcApi.java:83) at com.sap.conn.jco.rt.MiddlewareJavaRfc$JavaRfcClient.connect(MiddlewareJavaRfc.java:1273) ... 18 more
Does anyone know what I´m doing wrong? With thanks, Veit

Im having the same issue here. Has anyone found a solution to this?

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Hi There
Had the same problem as you. App would terminate when launched.
Solution to working You Tube app:
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This doesn't correct the problem, it's just a workaround for you to be able to use youtube app again.
Hope it helped.
Best Regards

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Hey Shaiju isac,
I'd take a look at the following article, it'll guide you though steps to you troubleshoot cellular data issues on your iPhone:
iPhone: Troubleshooting a cellular data connection
http://support.apple.com/kb/ts3780
Cheers,
David

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Best regards,
Ulli

Most important question when you are talking about performance-issues:
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ciao
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We have big Performance Problems with following Statement:
SELECT * FROM zeedmt_zmon INTO TABLE gt_zmon_help
FOR ALL ENTRIES IN gt_zmon_help
    WHERE
    status = 'IAI200' AND
    logdat IN gs_dat AND
    ztrack = gt_zmon_help-ztrack.
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Thank you!

>
Matthias Weisensel wrote:
> We have big Performance Problems with following Statement:
>
>
SELECT * FROM zeedmt_zmon INTO TABLE gt_zmon_help
>   FOR ALL ENTRIES IN gt_zmon_help
>     WHERE
>     status = 'IAI200' AND
>     logdat IN gs_dat AND
>     ztrack = gt_zmon_help-ztrack.
>
> In the internal table gt_zmon_help are over 1000000 entries.
> Anyone an Idea how to improve the Performance?
>
> Thank you!
You can't expect miracles. With over a million entries in your itab any select is going to take a bit of time. Do you really need all these records in the itab? How many records is the select bringing back? I'm assuming that you have got and are using indexes on your ZEEDMT_ZMON table.
In this situation, I'd first of all try to think of another way of running the query and restricting the amount of data, but if this were not possible I'd just run it in the background and accept that it is going to take a long time.

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