Does weblogic set socket buffer size ?

Hi all,
Want to know if Weblogic sets the Socket buffer size,when it establishes a connection with a client ?
If so then what is its default value?
any help is appreciated.
Thanks in advance.

Thanks for all your reply.
I give u more detail on my issue:
Test Environment:
Server: 4 GB memory, 1.3 GHz, a dual core CPU with hyper-threading enabled on each core (4 logical CPUs), a tomcat with my application deployed
Client: the same configuration as Server, a http simulator
Network: 1Gb/s
Test:
1> Simulate one user. Client keep sending requests to server, and server has one thread serve user's requests. (make Server always busy)
request
Server <------------- Client
response
Server ---------------> Client
request
Server <-------------- Client
CPU usage was 18%, in normal case should be 25% (100% / 4 = 25%, in my other cases, CPU were 25%)
Take a few thread dumps: saw threads sometimes blocked in the native method java.net.SocketOutputStream.socketWrite0(Native Method).
2> Simulate 4 concurrent users. Client keep sending requests to server concurrently, and server has multiple threads serve user's requests. (make Server always busy)
4 requests
Server <------------- Client
responses
Server ---------------> Client
requests
Server <-------------- Client
CPU usage was 80%, in normal case should be 90%+.
Take a few thread dumps: saw threads sometimes blocked in the native method java.net.SocketOutputStream.socketWrite0(Native Method).
If CPU was not fully utilized, for example only 80%, server must be blocked by something. And this bottleneck would impact the scalability of server.
If I can remove this bottleneck and do not bring other overheads, I may acquire:
1> a higher throughput
2> a more scalable server
In our performance requirement, server CPU usage must be 90%+.
I just feel strange that why the CPU usage was normal (25% for single thread test or 90%+ for 4 threads test) even I choose a very small buffer size.

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Setting the buffer size centrally

 Is there a way to set the buffer size to a specific value for
 multiple JSPs without having to use the @page buffer...
 directive on every page?
 I have a JSP/EJB application with many JSPs and want to allow
 for an easy update of the buffer size in the future.
 Placing <@page buffer... in a separate file and using the
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I had the same problem, and that's a great solution. Anyone know how to set
 the autoFlush property in an included file?
 "Gary Keim" <[email protected]> wrote in message
 news:3a96c2d8$[email protected]..
 > % cat Test.jsp
 > <%@ include file="SetBuffer.jsp" %>
 >
 > <html>
 > <body>
 > BufferSize is <%response.getBufferSize()%>
 > </body>
 > </html>
 > % cat SetBuffer.jsp
 > <%response.setBufferSize(16000);%>
 > --
 > Gary
 >
 > "Padraig O Broin" <[email protected]> wrote in message
 > news:3a969809$[email protected]..
 > >
 > > Is there a way to set the buffer size to a specific value for
 > > multiple JSPs without having to use the @page buffer...
 > > directive on every page?
 > >
 > > I have a JSP/EJB application with many JSPs and want to allow
 > > for an easy update of the buffer size in the future.
 > >
 > > Placing <@page buffer... in a separate file and using the
 > > @include directive or <jsp:include... action doesn't work.
 >
 >

Performance affected from the socket buffer size

I have a server program deployed in the Tomcat server.
I found the server was sometime blocked in the native method java.net.SocketOutputStream.socketWrite0(Native Method). And the CPU was not fully utilized.
Intuitive thinking, may be I can solve this problem by increasing the socket send buffer size. So I tried it.
By default, tomcat socket send buffer size is 9000 bytes or so. I increased this value to 102400 bytes. Tested again. CPU usage was around 100%. OK, it worked.
But how about if I decrease this value to a small number? I tried. Set the value to 100 bytes. Tested again. CPU usage was still around 100% !!!
So, the problem here is: CPU was not able to be fully utilized by using the default buffer size (9000 bytes). But if you increase the value to a very large number or a very small number, you can achieve a better performance.
note: the client was sending requests all the time. Just like the stress test. So, the server side was always busy.
Edited by: willpowerforever on Jul 31, 2009 6:37 PM

Thanks for all your reply.
I give u more detail on my issue:
Test Environment:
Server: 4 GB memory, 1.3 GHz, a dual core CPU with hyper-threading enabled on each core (4 logical CPUs), a tomcat with my application deployed
Client: the same configuration as Server, a http simulator
Network: 1Gb/s
Test:
1> Simulate one user. Client keep sending requests to server, and server has one thread serve user's requests. (make Server always busy)
request
Server <------------- Client
response
Server ---------------> Client
request
Server <-------------- Client
CPU usage was 18%, in normal case should be 25% (100% / 4 = 25%, in my other cases, CPU were 25%)
Take a few thread dumps: saw threads sometimes blocked in the native method java.net.SocketOutputStream.socketWrite0(Native Method).
2> Simulate 4 concurrent users. Client keep sending requests to server concurrently, and server has multiple threads serve user's requests. (make Server always busy)
4 requests
Server <------------- Client
responses
Server ---------------> Client
requests
Server <-------------- Client
CPU usage was 80%, in normal case should be 90%+.
Take a few thread dumps: saw threads sometimes blocked in the native method java.net.SocketOutputStream.socketWrite0(Native Method).
If CPU was not fully utilized, for example only 80%, server must be blocked by something. And this bottleneck would impact the scalability of server.
If I can remove this bottleneck and do not bring other overheads, I may acquire:
1> a higher throughput
2> a more scalable server
In our performance requirement, server CPU usage must be 90%+.
I just feel strange that why the CPU usage was normal (25% for single thread test or 90%+ for 4 threads test) even I choose a very small buffer size.

How to set optimum buffer size when burning CDs?

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How does one determine the optimum size? Is this size related to the burning speed?
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cobaltgreen

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DBMS_OUTPUT.ENABLE(null) - does this set the serveroutput size to unlimited

Hi,
I am in 10gR2. But my SQL plus client is still with 9i.
Hence i am unable to use the 10gR2 feature of setting the serveroutput to unlimited size.
If i issue
SET SERVEROUTPUT ON SIZE UNLIMITED
I am getting this error.
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[ FOR[MAT] { WRA[PPED] | WOR[D_WRAPPED] | TRU[NCATED] } ]
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«

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A DAQboard is an IOtech device. I use a DAQbook in one of my programs.
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Jenna,
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Real-Time Chart Example
http://venus.ni.com/stage/we/niepd_web_display.DISPLAY_EPD4?p_guid=B45EACE3E95556A4E034080020E74861&p_node=DZ52038&p_submitted=N&p_rank=&p_answer=&p_source=Internal
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Getting recv buffer size error even after tuning

I am on AIX 5.3, IBM J9 VM (build 2.3, J2RE 1.5.0 IBM J9 2.3...), Coherence 3.1.1/341
I've set the following parameters as root:
no -o sb_max=4194304
no -o udp_recvspace=4194304
no -o udp_sendspace=65536
I still get the following error:
UnicastUdpSocket failed to set receive buffer size to 1428 packets (2096304 bytes); actual size is 44 packets (65536 bytes)....
The following commands/responses confirm that the settings are in place:
$ no -o sb_max
sb_max = 4194304
$ no -o udp_recvspace
udp_recvspace = 4194304
$ no -o udp_sendspace
udp_sendspace = 65536
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Ghanshyam

Can you try running the attached utility, and send us the output. It will simply try to allocate a variety of socket buffer sizes and report which succeed and which fail. Based on the Coherence log message I expect this program will also fail to allocate a buffer larger then 65536, but it will allow you verify the issue externally from Coherence.
There was an issue with IBM's 1.4 AIX JVM which would not allow allocation of buffers larger then 1MB. This program should allow you to identify if 1.5 has a similar issue. If so you may wish to contact IBM support regarding obtaining a patch.
thanks,
Mark Attachment: so.java (*To use this attachment you will need to rename 399.bin to so.java after the download is complete.) Attachment: so.class (*To use this attachment you will need to rename 400.bin to so.class after the download is complete.)

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set serveroutput on size 100000
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ORA-20000: ORU-10027: buffer overflow, limit of 20000 bytes
ORA-06512: at "SYS.DBMS_OUTPUT", line 35
ORA-06512: at "SYS.DBMS_OUTPUT", line 198
ORA-06512: at "SYS.DBMS_OUTPUT", line 139
ORA-06512: at line 28
Does SQL Developer 1.5.3 not, in fact, honor the SIZE portion of SET SERVEROUTPUT ON? If not, can this be set in the preferences? (couldn't find it).
Thanks.
Dana

Dana N wrote:
Note... I'm running Oracle 9i, soon to be 10g. Don't know if that matters. Seems in 11g, there's another way to set the buffer size specifically for dbms_output, e.g. dbms_output.enable(100000)-- or null for unlimited. I couldn't get this to work on 9i.
Danadbms_output.enable(buffer_size) has been available since 9i if not before.

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Hello,
I recall an AE on here once mentioning that network streams can exhibit problems if you set a buffer size greater than 9MB, but I haven't been able to find any concrete explanation of this. The reason behind me asking is that, I'm currently running into some memory problems in my application in which I initialize my buffer to 30MB.
Basically, my application starts out running fine, but after 30-45 minutes, all of a sudden, my network stream buffer starts building up until it reaches a max value, even though I am still reading data out of it at seemingly the same rate. It's as if routine memory allocation/deallocation elsewhere in my application causes issues with the network stream.
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thanks in advance,

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http://www.ni.com/white-paper/12267/en/#toc4
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public void transferVideo(){
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 System.exit(1);
 BufferedReader stdIn = new BufferedReader(new InputStreamReader(System.in));
 // while (true) {
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 try
 out.writeUTF("7");
 System.out.println(fileAddress);
 out.writeUTF(fileAddress);
 fileType=getFileExtension(fileAddress);
 fileName=getFileName(fileAddress);
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 FileOutputStream fos = new FileOutputStream(outputFile);
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 mediaSocketdiaServerSocket .close();Thnx

Well how come my code only outputs 342.8 KB per file?
Client
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 System.out.println(fileAddress);
 out.writeUTF(fileAddress);
 fileType=getFileExtension(fileAddress);
 fileName=getFileName(fileAddress);
 String inp;
 outputFile = new File(fileName);
 FileOutputStream fos = new FileOutputStream(outputFile);
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 int sizeRead = 0;
 fSize = in.readInt();
 byte[] buff = new byte[3000];
 System.out.println ("Size of file is " + fSize);
 //out.writeByte('\n');
 //out.flush();
 System.out.println(is.markSupported());
 int count;
 while (sizeRead < fSize && (count = is.read(buff)) > 0)
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 out.flush();
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 }Server
private void transferVideo(String inputLine) {
 try {
 out.writeUTF("Sending over a movie");
 System.out.println(inputLine);
 File f = new File(inputLine);
 FileInputStream fis = new FileInputStream(f);
 long fsize = f.length();
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 int count;
 while ((count = fis.read(buf)) > 0){
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 }//end while
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Now I have upgraded to NI-VISA 3.4 and I am asking the same question. I notice that an error code is no longer sent when I input different values for the buffer size. However, in my program, the bytes returned from the device max out at 4096, no matter what value I input into the buffer size control. So, has VISA changed, and it is now possible to change the buffer size, but I am setting it up wrong? Or, have the error codes changed, but it is still not possible to change the buffer size on a Linux machine with NI-VISA?
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Sam

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Thanks,
Josh

Set serveroutput on size unlimited

ORA-20000: ORU-10027: buffer overflow, limit of 1000000 bytes
ORA-06512: in "SYS.DBMS_OUTPUT", Zeile 35
ORA-06512: in "SYS.DBMS_OUTPUT", Zeile 161
ORA-06512: in "SYS.DBMS_OUTPUT", Zeile 123
ORA-06512: in Zeile 1it is not possible to set dbms_output buffer size to "unlimited", as we can do in 10gR2.

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Okay what does this term mean:
Buffer Sizes Are Not Equal
I am playing with transitions. I have two clips with enough handles.
I'm using the gradient wipe and putting a Photoshop file in the "well".
That message pops up in the timeline when I'm stopped at that place in the timeline (similar to the media offline message). When I try to render the effect, the same message appears and doesn't even attempt to render.
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The image itself is a blue circle over a transparent background. That's the only layer.
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Does weblogic set socket buffer size ?

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