DPS6.2 Proxy Attribute: number-of-threads

What does the parameter number-of-threads mean in reference to DPS6.2 Proxy Server. It actually the value that we can set under Proxy Server -> Server Configuration -> Performance -> Non-Secure Service -> Connections.
From Command line we can run: ./dpconf get-ldap-listener-prop -h host -p port
to see the parameter number-of-threads.
By Default the value is set to 2. We had lots of issues on the proxy servers. The requests never reached the server. We saw nothing in the logs. But when we hiked this value to 64 which is max as per the console, the issues were resolved.
Any thoughts around the same would be highly appreciated.

One "listener" thread accepts new connections and hand them over to a "connection handler" thread which is responsible for polling/reading traffic. Once an operation is read, it is passed over to a 'worker thread' that processes the request.
The parameter you mention controls how many "connection handler' threads are associated with the 'listener' thread. By default, it is set to 2. Each client connection is associated (using round robin algo) with 1 connection handler thread.
-Sylvain

Similar Messages

High number of threads and high CPU usage on a single instance

Without any apparent reason, in some moments of day the website reports an increment of the HTTP Queue Length from an average of 10/20 queued requests to 100/200 and more.
In that period of time the Average Response Time increases but the number of the requests on the website don't. Even increasing the instances it doesn't help to resolve the problem (maybe it just reduced it).
It seems that the problem is not related to the traffic on the site. This issue happens either when the traffic is high or low.
The autoscaling works well, we don't have peak of traffic but always a slow increasing of requests and the CPU is always below the 50% (memory too). The issue is resolved by the swap of the site and sometimes it's resolve by itself after a while.
What I discovered when the issue happens, is that there's an instance (just an instance only), that has an high number of threads and CPU usage on the W3WP.exe process and these values are above the mean than the other instances. Eg, instances are around
50/60 threads and 10/20% of CPU, the instance with the problem has 200 threads and 50/60% of CPU. If I kill the W3WP process on that instance the issue is resolved.
I monitored the HTTP requests, I tried the website extension "Diagnostics as service" but I can't discover anything that can help me to understand the problem. Of course, there are many requests that go in timeout but it is a consequences of a
unresponsive instance.
On the web hosting plan there are only two sites: the production site and its staging which is used for update of the production only and it's always sleeping. Plus, no webjobs are running on this site.
What can I do to gather useful information that can help me to understand the reason of this problem?
Thank you!

"Does the instance with the high counts receive more traffic than the other instances? Is it possible that the load balancer not
working the way it should be?"
How can I get that information? I can't see metrics for a specific instance
"Does it always happen to the first instance?"
I will check it better, but in the order given by the Processes panel it's the second instance which has the issue. The scaling is at 2 instances for the most part of the time (it's the minimum).
Maybe one time it was the 3th instance but I'm not sure, I'll give it more attention.
" How long do these moment last?"
The time can be 10 to 30 minutes, but I fix it as soon as I see the problem. It's not the down-scaling to resolve it because in these situations the CPU as well is high so the scaling holds or increases the number of instances.
"- How often do these moments occurs?"
It occurs quite often, 2/4 times a week.

How to find out the number of threads created under java vm at runtime

our application seems to have hit the max number of threads that can be created under vm and the vm will just hang after that. that behavior seems to be consistent from an article that I read earlier.
I wonder any way that java app can find out the number of threads currently created under vm?
thanks in advance!

If you are not starting an extra thread group you can use the Thread.activeCount method. But this willnot return all the threads, as there are some jvm threads, i.e. garbage collector. Also if you are running on a Unix type operating system then you can send a signal to the jvm to give you a thread dump, i think the signal is sighup.
If the application is hanging i would of thought that you have a deadlock situation rather then the JVM not being able to create new threads, roughly how many threads should be running ??

Grey screen and "incorrect number of thread records"

I think I am in trouble. My eMac will not boot and gets stuck on the great screen with the Apple logo and the spinning windmill. I have followed the instructions in the Apple help article up to but not including "archive and install". I tried the advanced secure boot and the messages I got over and over were "HFSSWAPHFSPlusBTIternalmode: catalog record #30 keylength=34 expected=144 node=15278 File ID=4 volume= Macintosh HD device=/dev/disk 0s 10"
And
"Jan31 12:00:35 Launched: /System /Library/CoreServices/Loginwindow.app/Contents/MacOS/Loginwindow Port/dev/console exited abnormally: Trace/ BPT trap"
And
Jan31 12:02:13 Launched: Getty repeating too quickly on port/ dev/ console, sleeping"
I rest the PRAM and NVRAm as instructed.
I booted from the OSX 10.4 install disk and ran the verify disk and repair disk sequences several times. It did repair a number of things but it kept coming back to "
Message was edited by: Mont Rigaud Stud
Itkept coming back to "incorrect number of thread records". Even after running repair disk again several times it came back to the same thing and said
"the volume Macintosh HD could not br repaired after 3 attempts
ERROR: the underlying task reported failure On exit
1HFS volume checked
1 vOlume could not be repaired because of an error
Repair attempted on 1 volume
1 volume could not be repaired"
What should I do? I am NOT BACKED UP! How do I back up now? Can I usean external Hard drive? I really do not want to lose my photOs, email and business files.
I am typing my question on my iPhone, so that accounts for the poor capitalization.
Thanks
Doug

Will it boot in Safe Mode? See
What is Safe Boot, Safe Mode? (Mac OS X)
http://docs.info.apple.com/article.html?artnum=107392
Takes a while to run, but it usually "fixes" problems.
Resolve startup issues and perform disk maintenance with Disk Utility and fsck
http://docs.info.apple.com/article.html?artnum=106214
 Cheers, Tom

Setting the right number of thread count

Hi,
What's the right number of thread for a server that has 2 CPU? I know the default setting for Dev is 15 and Production is 25. From what I read in the Performance Tuning Guide, it should be somewhere around the number of CPUs on the machine? Is that right? Or keep the default?

Statement st = con.createStatement();
st.setFetchSize(no_of_rows_here);
ResultSet rs = st.executeQuery(query);Sudha

"max number of thread"

We are running a java web app on a Ubuntu Oracle WebLogic server version 10.3.3.
The java web app performs long polls with open tcp socket to keep the client connection open. The clients are long polling the WebLogic at 30 seconds.
Currently we are not able to maintain stability for greater than 24 hours with approximately 200 simultaneous sessions on WebLogic server. Session to me is active client/server tcp connection. We have re-written our application to use continuations, but we are seeing ConcurrentModificationException errors in performance testing.
Is there any setting in WebLogic for “max number of thread” that can handle?
Edited by: user9316392 on Jul 8, 2010 11:07 AM

First, WebLogic since 9.0 has a self-tuning thread pool where WLS will automatically grow and shrink the number of threads based on some internal algorithms. I'm not aware of a hard limit so theoretically there is no max thread count as long as the JVM has memory and WLS thinks more threads will help. You can read up on it here:
http://www.oracle.com/technology/pub/articles/dev2arch/2006/01/workload-management.html
Practically, I wouldn't expect more than several hundred threads to be helpful.
As for your situation, how does WLS become unstable? Out of memory, out of file descriptors, errors on new requests, etc. I think you're going to have to use some JVM tools to see what happens to your JVM over time. Is there a memory leak somewhere, is it non-heap memory, etc. JRockit Mission Control is helpful if running on JRockit. If you're on Sun Hotspot, them presumably you can use some of the Hotspot tools. You'll want to compare the state of the JVM towards the beginning of your load test, but after a slight warm-up period with a snapshot after the load test has been running for a long period of time.

Max number of threads in a jvm

Is there any constraint for the maximum number of threads that we can
create in a particular JVM

Why do you have to worry about that? I don't see a reason to create lots and lots of threads. The OS will usually spend most of the time doing context switches if you create more than a couple of thousand threads.
Kaj

Max number of threads in Java?

Hi,
I am running into a bug now that I am testing my working code. Basically, my program creates a bunch of objects that talk to each other. Each object is a thread, and at a given time (there is a one object that keeps track of time) a thread may choose to message another thread. My problem is that when I create more objects, my code doesn't run to completion. For example, when I have 10 objects talking to each other, things work fine. But if I have 15, they all run for a little bit, then the program seems to just hang and not do anything.
Is there a limit as to how many threads I can have? If I was out of memory or something, I'd get an exception, right? But I don't get anything - it just seems like things "freeze up".

15 threads? shouldn't be a problem.
I think th emax threads allows runs in thousands..if not ten of thousands.Java process threads itself use about 600 or more threads. howevr, it could also be the underlying system restr8iction on the number of threads allow per process????
for you case: it's highly likely you run into the max # of threads.
I can only think of two reasons for your application to freeze:
1. Deadlock
if you have an object that is synchronized..than you might have run into a deadlock (race-condition)
for example:
Object A has the key for Object X , and waiting for Object Z
Object B has the key for Object Z, and waiting for Object X
as you can see..they will never gives up the lock....so you're in a dead lock.
2. Low memory resource. (Memory - Paging and Thrashing)
Each of your thread is using up the resouces (memory) and processing power.
When you reach the max or near max and needs to create more memory..the garbage collector kick in
and try to reclaim some unused memory. This can slow down your application dramatically if the garbage
collector is invoke often.
Also..paging is performed when you reach max memory..the operating system keep on paging your memory (usually happens when there's a lot of threads and not enough memory. If this happen..than it
can cause your program to becomes freeze like....remeber..each thread is given a small amount of time to
perform a task..if the time it takes to load a page for a thread is almost equals to context switch time..than
no work is really done..and your program "freeze"
solution..redesign you app to prevent thrashing.
it is likely paging is the culprit..but i would not dismiss deadlock issues.

Max Number of threads per Process in Solaris 8

I'm running into qpplication which crashes with a segfault when the LWP for that process hits about 255, i'm trying to find the maximum number of threads per process using sysconf and its returning -1
#include <unistd.h>
int
main(void)
printf("%ld\n",sysconf(_SC_THREAD_THREADS_MAX));
return 0;
I'm using gcc 3.3.2
If anyone can tell me the maximum number of threads per process I would really appreicate it.
Also the maximum number of open files per process.
Thanks in advance
- Rodrick Brown
- DoITT

Please make sure that you build a
multithreaded program first (check with ldd).
If anyone can tell me the maximum number of threads per process I would
really appreicate it.
Also the maximum number of open files per process. It depends on the architecture (x86/SPARC), OS version,
64 or 32-bit, /etc/system, shell limitations (/usr/bin/ulimit) ...
Search for "rlim_fd_max / rlim_fd_cur" on docs.sun.com too.
HTH,
-vladimir

How to calculate number of threads running on Windows 2000 terminal?

How to calculate number of threads running on Windows 2000 terminal for the oracle process?
I have installed Oracle 9i DataBase with 6 patch(9.2.0.6.0) on Windows 2000 Terminal.
But,after database is started up, when i check up the sessions in v$session view.
It is showing like for SYSTEM osuser alone, 10 ORACLE.EXE sessions running on this server machine in active state.
Why it is creating 10 ORACLE.EXE sessions for a single Oracle Server.
This is the output of v$session view.
SQL> select terminal,osuser,status,sid,serial#,program from v$session;
TERMINAL OSUSER STATUS SID SERIAL# PROGRAM
IMGDBSVR SYSTEM ACTIVE 1 1 ORACLE.EXE
IMGDBSVR SYSTEM ACTIVE 2 1 ORACLE.EXE
IMGDBSVR SYSTEM ACTIVE 3 1 ORACLE.EXE
IMGDBSVR SYSTEM ACTIVE 4 1 ORACLE.EXE
IMGDBSVR SYSTEM ACTIVE 5 1 ORACLE.EXE
IMGDBSVR SYSTEM ACTIVE 6 1 ORACLE.EXE
IMGDBSVR SYSTEM ACTIVE 7 1 ORACLE.EXE
IMGDBSVR SYSTEM ACTIVE 8 1 ORACLE.EXE
IMGDBSVR SYSTEM ACTIVE 9 1 ORACLE.EXE
IMGDBSVR SYSTEM ACTIVE 10 1 ORACLE.EXE
SUGANTHI_DBA suganthi ACTIVE 11 91 sqlplusw.exe
11 rows selected.
SQL>

This is how i have related these two views:
SQL> select s.terminal,s.osuser,s.status,s.paddr s_paddr,b.paddr p_paddr,s.program
2 from v$session s,gv$bgprocess b
3 where s.paddr=b.paddr;
TERMINAL OSUSER STATUS S_PADDR P_PADDR PROGRAM
IMGDBSVR SYSTEM ACTIVE 33AF2270 33AF2270 ORACLE.EXE
IMGDBSVR SYSTEM ACTIVE 33AF2654 33AF2654 ORACLE.EXE
IMGDBSVR SYSTEM ACTIVE 33AF2A38 33AF2A38 ORACLE.EXE
IMGDBSVR SYSTEM ACTIVE 33AF2E1C 33AF2E1C ORACLE.EXE
IMGDBSVR SYSTEM ACTIVE 33AF3200 33AF3200 ORACLE.EXE
IMGDBSVR SYSTEM ACTIVE 33AF35E4 33AF35E4 ORACLE.EXE
IMGDBSVR SYSTEM ACTIVE 33AF39C8 33AF39C8 ORACLE.EXE
IMGDBSVR SYSTEM ACTIVE 33AF3DAC 33AF3DAC ORACLE.EXE
IMGDBSVR SYSTEM ACTIVE 33AF4958 33AF4958 ORACLE.EXE
IMGDBSVR SYSTEM ACTIVE 33AF4D3C 33AF4D3C ORACLE.EXE
10 rows selected.
SQL>
Here, It shows 10 sessions are running.
Whether this means 10 threads are running on the particular server or not?

Number of threads for imap process

What is the resonable nimber of threads for imap procerss?
I have 2 impad procrss and number of threads more then 200!!!
I think this is to much for 700-900 concurrent impa connection&
What is the reasons for this big number

Actually, your configuration sounds pretty close to correct for your load.
We allocate up to 250 threads, as many clients connect more than one time per session, and open more than one folder at a time.
I would not mess with the number of threads.
If most of your users have small numbers of messages and folders, you may be able to get away with a single imap process, but if you have several processors, two is fine, too.
Is there a problem or error situation you're trying to work around? What exact version of Messaging do you use? (imsimta version gets that)

Limiting the number of threads that are created

I am trying to write a web crawler as a way of learning about multi-threading and I have hit a stumbling block (probably my design). The way the application I have started works is that I provide a single URL, which is passed to a thread and that thread then parses the web page building a list of links (If the links are not already held in a 'visited' list then they are saved in a list in the Runnable object that is parsing the html page).
When the page has been parsed the list of links are then passed to a method in a Utilities class that creates a new group of threads, 1 for each link and each of these threads then does the same thing. The problem I have is that as more and more links are captured more and more threads are created eventually I either get a out of memory exception or I get an operating system 'cannot create native thread' message. I am not sure if the threads are staying in memory after they have done their tasks, I am not sure why I am running out of memory so quickly.
What I would like to try and do is to set a limit for the maximum number of threads created and then only create new threads if the limit is not breached. If someone could point me in the right direction that would be good, I have googled around but cant find an example of what I want to do.
Thanks

Thanks for that, that has given me a lot to read up on and I can already see where I went wrong.... I think implementing a thread pool and also a work queue is probably the way I will go from now on.

Number of Threads Question

Hi,
I'm working on a pretty big program and i need a lot of threads to make it run well (it's an audio player and, of course, i don't need people to wait when, for example, they save a playlist). So, i put some of these tasks on different threads, plus others that i didn't need for making the program run faster, but they are there just to make the program run. Now i have at least 4 threads running at the same time and, in some cases, there are even 6 or 7. Is it too much? It's my first big program (it's just for fun but i still want it to run well) and i didn't need so many threads before. What's the maximum number of threads you'd recommend me to have?
Thanks.

Anakin1989 wrote:
Hi,
I'm working on a pretty big program and i need a lot of threads to make it run well (it's an audio player and, of course, i don't need people to wait when, for example, they save a playlist). So, i put some of these tasks on different threads, plus others that i didn't need for making the program run faster, but they are there just to make the program run. Now i have at least 4 threads running at the same time and, in some cases, there are even 6 or 7. Is it too much? It's my first big program (it's just for fun but i still want it to run well) and i didn't need so many threads before. What's the maximum number of threads you'd recommend me to have?
Thanks.Are you experiencing any problems with the number of Threads you have? If not, stop worrying. On the other hand, are you sure you need all of them? There are alternatives to Threading, such as SwingWorker and Timer that might be able to help you out.
One thing you better make sure of is that you're not doing any Swing work off of the EDT, or doing things like sleeping or time-consuming work on the EDT.

Tuning the good number of thread with Work Manager?

Hi,
I search some best practice or experience return on the max thread number on a weblogic managed server
I try to explain: with WLS 8.1 and execute queue it was hard to tune the good number of thread but possible (with some processor and for an application we find that after 30 concurrent thread, there's lower performance because of switch on processeur, for others it was 45 for example)
Now i can see sometimes more than 500 thread on one JVM and it seem to be very much for me!!
we face some problem of response time in PRODUCTION, i can see sometimes more than 100 Stuck thread on a resource, so i think it's the reason of bad response time. But with Work Manager, it increase the number of thread to accept others request and the CPU stay at acceptable level (less than 50%) because the stuckthread are do nothing (waiting for resource)
So i don't understand the good tuning to apply since WorkManager...ok it isn't normal to have a lot of stuck thread but if there's no matter about the max number of thread, is it useful to stop and restart managed server?
do you think we can have have bad performance if there's a lot of thread?
thank you for your experience return. If you have no idea just tell me how much thread you can see on your managed server in Production.

up, up...
we have always the same probleme in production: 50 stuck thread on each JVM since 15 days....
the manages serveurs are in warning but don't seem to be disturb cause the work manager add more threads dynamicaly.
Anyone have idea if this situation is a probleme for response time on other request ?
reboot managed solve this situation but i would like to understand the consequence of this situation.
thanks a lot for your experience.

Max number of Thread allowed

I am writing a multi threading program.
is there any limit on max number of thread allowed?
if yes, how to check the limit?

For the language: no. It depends on your memory (every Thread has its own stack, etc.).
Kind regards,
Levi

DPS6.2 Proxy Attribute: number-of-threads

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