RE: The Woes of CFThread -- going out of my mind!

2008-07-10 Thread Dave Watts
> I'd try to really limit the number of threads your creating. 
> I'd even look at limiting things to a fixed number of worker 
> threads. Try dividing the work load between like 5 or 6 
> threads. Have each thread process it's share of the work load 
> (i.e. each work load would handle 1/5 of the workload--so 
> w/500 records, thread one would work on records 1-100, thread 
> 2 would work on records 101-200, etc.)

Dan and Brad's suggestions are the way to go here. With 1K concurrent
threads, I'm surprised it's not failing even quicker.

One common pattern of sorts to use here is to create a thread pool and a
controller thread. The controller thread could keep track of which reports
have and/or haven't been generated, and track the progress of the worker
threads.

Dave Watts, CTO, Fig Leaf Software
http://www.figleaf.com/

Fig Leaf Software provides the highest caliber vendor-authorized
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Chicago, Baltimore, Northern Virginia, or on-site at your location.
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Re: Missing Messages --- was Re: The Woes of CFThread -- going out of my mind!

2008-07-10 Thread Michael Dinowitz
I'd also check if there's a spam blocker 'upstream' from you, especially if
your getting your mail through a business location. In addition, the server
is set to try and send mail for 48 hours before dropping it. A network
problem that prevents or distorts mail server connections within that time
frame could also cause mail to not show up.


On Thu, Jul 10, 2008 at 12:00 PM, Ian Skinner <[EMAIL PROTECTED]> wrote:

> Brad Wood wrote:
> > Dan, I already suggested this approach to IAN nearly a month ago--
> > twice.
> >
> > http://www.houseoffusion.com/groups/cf-talk/message.cfm/messageid:307447
> > http://www.houseoffusion.com/groups/cf-talk/message.cfm/messageid:307626
> >
> > If he thought there was merit in that he probably would have tried it
> > already.
> >
> > ~Brad
>
> I suspected I have not been getting all of HOF messages, but now I have
> confirmation.  I had noticed that once in a while I did not recieve a
> copy of a message I sent to the lists.  I also noticed that there were
> increasing cases where there seemed to be replies to messages that I
> never receive the original.
>
>  I never received either of these replies a month ago.
>
> I do not see in messages from HOF in the spam folder at my end, but I am
> not sure what may be happening in between.  I'll have to look up
> Micheal's address when I get back from my 9:00 am meeting to see if
> anything is getting bounced back.
>
>
> 

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RE: Missing Messages --- was Re: The Woes of CFThread -- going out of my mind!

2008-07-10 Thread Brad Wood
OK, then.  I'll take you off my black list.  :)

~Brad

-Original Message-
From: Ian Skinner [mailto:[EMAIL PROTECTED] 
Sent: Thursday, July 10, 2008 11:00 AM
To: CF-Talk
Subject: Missing Messages --- was Re: The Woes of CFThread -- going out
of my mind!

Brad Wood wrote:
> Dan, I already suggested this approach to IAN nearly a month ago--
> twice.
>
>
http://www.houseoffusion.com/groups/cf-talk/message.cfm/messageid:307447
>
http://www.houseoffusion.com/groups/cf-talk/message.cfm/messageid:307626
>
> If he thought there was merit in that he probably would have tried it
> already.
>
> ~Brad

I suspected I have not been getting all of HOF messages, but now I have 
confirmation.  I had noticed that once in a while I did not recieve a 
copy of a message I sent to the lists.  I also noticed that there were 
increasing cases where there seemed to be replies to messages that I 
never receive the original. 

 I never received either of these replies a month ago.

I do not see in messages from HOF in the spam folder at my end, but I am

not sure what may be happening in between.  I'll have to look up 
Micheal's address when I get back from my 9:00 am meeting to see if 
anything is getting bounced back.


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Missing Messages --- was Re: The Woes of CFThread -- going out of my mind!

2008-07-10 Thread Ian Skinner
Brad Wood wrote:
> Dan, I already suggested this approach to IAN nearly a month ago--
> twice.
>
> http://www.houseoffusion.com/groups/cf-talk/message.cfm/messageid:307447
> http://www.houseoffusion.com/groups/cf-talk/message.cfm/messageid:307626
>
> If he thought there was merit in that he probably would have tried it
> already.
>
> ~Brad

I suspected I have not been getting all of HOF messages, but now I have 
confirmation.  I had noticed that once in a while I did not recieve a 
copy of a message I sent to the lists.  I also noticed that there were 
increasing cases where there seemed to be replies to messages that I 
never receive the original. 

 I never received either of these replies a month ago.

I do not see in messages from HOF in the spam folder at my end, but I am 
not sure what may be happening in between.  I'll have to look up 
Micheal's address when I get back from my 9:00 am meeting to see if 
anything is getting bounced back.


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RE: The Woes of CFThread -- going out of my mind!

2008-07-10 Thread Brad Wood
Dan, I already suggested this approach to IAN nearly a month ago--
twice.

http://www.houseoffusion.com/groups/cf-talk/message.cfm/messageid:307447
http://www.houseoffusion.com/groups/cf-talk/message.cfm/messageid:307626

If he thought there was merit in that he probably would have tried it
already.

~Brad

-Original Message-
From: Dan G. Switzer, II [mailto:[EMAIL PROTECTED] 


Threads should be used with caution, because each thread is going to be
taking up memory (although I'm not sure how much memory each thread
uses.)
Spawning off threads like this is in rapid fire succession is a good way
for
the JVM to run out of memory and once that happens, everything becomes
really unstable.

I'd try to really limit the number of threads your creating. I'd even
look
at limiting things to a fixed number of worker threads. Try dividing the
work load between like 5 or 6 threads. Have each thread process it's
share
of the work load (i.e. each work load would handle 1/5 of the
workload--so
w/500 records, thread one would work on records 1-100, thread 2 would
work
on records 101-200, etc.)

-Dan

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RE: The Woes of CFThread -- going out of my mind!

2008-07-10 Thread Dan G. Switzer, II
Ian,

>Here is my simplest test case to date.  I seems to show that there is a
>limit, but I really don't know where it might be.
>
>
>
>
>
>
>
>
>
>
>

What if you change the above code to:












This should do the exact thing, but it breaks it up to a maximum of 5
threads.

-Dan


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Re: The Woes of CFThread -- going out of my mind!

2008-07-10 Thread Brian Kotek
He could also still use cfthread, but loop over the query and create the
threads in chunks rather than all at once. I don't know how well that will
work given the overhead of creating the PDFs, but it would be worth trying
in different chunks (2, 5, 10, etc.).

On Thu, Jul 10, 2008 at 10:57 AM, Dan G. Switzer, II <
[EMAIL PROTECTED]> wrote:

> >The memory usage of the PDF report generation is defiantly a problem.
> >It is what we where trying to address with the usage of the thread tag.
> >The idea being that by splitting the process into separate threads and
> >throttle them down would allow the server time to clean up memory used
> >in previous iterations.
> >
> >That is a topic for a seperate discussion.  How does  work
> >in large iterations.  We found that no matter what we did, the memory
> >used by the report tag would just climb and climb each iteration unless
> >we broke up the process into completely separate HTTP requests.
> >
> >By creating a template that would process a small number of reports per
> >request and then send a page to the browser with a META refresh to
> >re-request the page in one second.  This works fine.
>
> While certainly not ideal, what if you split things up like this:
>
> 1) You create one template that creates a report based on some kind of
> unique key identifier.
>
> 2) You create a second template that loops through all the reports you need
> to create and call the first template using CFHTTP.
>
> This should at least sort of emulate the "meta refresh" technique, but
> allows you to automate the process w/out relying on a browser for the meta
> refresh.
>
> -Dan
>
>
> 

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RE: The Woes of CFThread -- going out of my mind!

2008-07-10 Thread Dan G. Switzer, II
>Brian Kotek wrote:
>> Also, Ian, how many threads are you creating here based on the query
>> results? 10? 10,000?
>>
>For this process 1,371.  That is my basic question at this time -- What
>are the practical limits of the 
>
>Here is my simplest test case to date.  I seems to show that there is a
>limit, but I really don't know where it might be.
>
>
>
>
>
>
>
>
>
>
>
>
>This code will frequently cause hung threads that NEVER end until the
>server is restarted.

Threads should be used with caution, because each thread is going to be
taking up memory (although I'm not sure how much memory each thread uses.)
Spawning off threads like this is in rapid fire succession is a good way for
the JVM to run out of memory and once that happens, everything becomes
really unstable.

I'd try to really limit the number of threads your creating. I'd even look
at limiting things to a fixed number of worker threads. Try dividing the
work load between like 5 or 6 threads. Have each thread process it's share
of the work load (i.e. each work load would handle 1/5 of the workload--so
w/500 records, thread one would work on records 1-100, thread 2 would work
on records 101-200, etc.)

-Dan


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RE: The Woes of CFThread -- going out of my mind!

2008-07-10 Thread Dan G. Switzer, II
>The memory usage of the PDF report generation is defiantly a problem.
>It is what we where trying to address with the usage of the thread tag.
>The idea being that by splitting the process into separate threads and
>throttle them down would allow the server time to clean up memory used
>in previous iterations.
>
>That is a topic for a seperate discussion.  How does  work
>in large iterations.  We found that no matter what we did, the memory
>used by the report tag would just climb and climb each iteration unless
>we broke up the process into completely separate HTTP requests.
>
>By creating a template that would process a small number of reports per
>request and then send a page to the browser with a META refresh to
>re-request the page in one second.  This works fine.

While certainly not ideal, what if you split things up like this:

1) You create one template that creates a report based on some kind of
unique key identifier.

2) You create a second template that loops through all the reports you need
to create and call the first template using CFHTTP. 

This should at least sort of emulate the "meta refresh" technique, but
allows you to automate the process w/out relying on a browser for the meta
refresh.

-Dan


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Re: The Woes of CFThread -- going out of my mind!

2008-07-10 Thread Brian Kotek
Yes the problem is probably that you are creating over 1000 threads, each of
which runs a cfreport tag to generate a PDF. You're probably killing the
server. CFThread threads are just like any normal CF web thread, and you
certainly wouldn't want to try and simultaneously process 1000 HTTP request
threads either. You might look at breaking this up and processing them in
smaller chunks of, say, 10 or something.

On Thu, Jul 10, 2008 at 10:17 AM, Ian Skinner <[EMAIL PROTECTED]> wrote:

> Brian Kotek wrote:
> > Also, Ian, how many threads are you creating here based on the query
> > results? 10? 10,000?
> >
> For this process 1,371.  That is my basic question at this time -- What
> are the practical limits of the 
>
> Here is my simplest test case to date.  I seems to show that there is a
> limit, but I really don't know where it might be.
>
> 
>
>
>
>
> 
>
> 
>
> 
>
>
> This code will frequently cause hung threads that NEVER end until the
> server is restarted.
>
> 

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Re: The Woes of CFThread -- going out of my mind!

2008-07-10 Thread Ian Skinner
Dan G. Switzer, II wrote:
> Ian,
> I wonder if the problem isn't with  but actually with heavy
> usage of either  or  tags.
>
> Are you creating large reports? It could be a memory issue your running in
> to. How much RAM is available to the JVM?
>
> I would try simplifying things. Does it always work if you comment out the
>  and  tags? 
>
> If it does, what happens if you comment out the  tag and just
> write a very simply PDF?
>
> I could see how if you're generating some large PDFs, that without enough
> RAM it could drive the JVM nuts.
>
> -Dan

The memory usage of the PDF report generation is defiantly a problem.  
It is what we where trying to address with the usage of the thread tag.  
The idea being that by splitting the process into separate threads and 
throttle them down would allow the server time to clean up memory used 
in previous iterations.

That is a topic for a seperate discussion.  How does  work 
in large iterations.  We found that no matter what we did, the memory 
used by the report tag would just climb and climb each iteration unless 
we broke up the process into completely separate HTTP requests.

By creating a template that would process a small number of reports per 
request and then send a page to the browser with a META refresh to 
re-request the page in one second.  This works fine. 

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Re: The Woes of CFThread -- going out of my mind!

2008-07-10 Thread Ian Skinner
Brian Kotek wrote:
> Also, Ian, how many threads are you creating here based on the query
> results? 10? 10,000?
>   
For this process 1,371.  That is my basic question at this time -- What 
are the practical limits of the 

Here is my simplest test case to date.  I seems to show that there is a 
limit, but I really don't know where it might be.













This code will frequently cause hung threads that NEVER end until the 
server is restarted.

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Re: The Woes of CFThread -- going out of my mind!

2008-07-10 Thread Brian Kotek
Also, Ian, how many threads are you creating here based on the query
results? 10? 10,000?


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Re: The Woes of CFThread -- going out of my mind!

2008-07-10 Thread Rupesh Kumar
Excellent point Dan! 

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RE: The Woes of CFThread -- going out of my mind!

2008-07-10 Thread Dan G. Switzer, II
Ian,

>Can anybody point out what is fundamentally wrong with this code.  Such
>that it has at least a 50% chance of complete failure resulting in a
>non-responsive ColdFusion server that must be restarted.  What gets me
>is that sometimes it works completely correct and produces all the
>desired files.  The next time, with the exact same code and data, it
>fails and hangs the server, but generates no exceptions or errors.  At
>least none that I have been able to find.
>
> [... clip ...]
>
>
>name="vRenewalReport">
>value="#variables.ResultFirms['firmno'][threadIndex]#">
>value="#DateFormat(variables.pIssueDate, 'mm/dd/yy')#">
>
>
>
>destination="#thread.vOutputFilePath#" overwrite="yes">
>
> [... clip ...]

I wonder if the problem isn't with  but actually with heavy
usage of either  or  tags.

Are you creating large reports? It could be a memory issue your running in
to. How much RAM is available to the JVM?

I would try simplifying things. Does it always work if you comment out the
 and  tags? 

If it does, what happens if you comment out the  tag and just
write a very simply PDF?

I could see how if you're generating some large PDFs, that without enough
RAM it could drive the JVM nuts.

-Dan


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Re: The Woes of CFThread -- going out of my mind!

2008-07-10 Thread Rupesh Kumar
Well, Did you check what is the thread doing when you say the Server is hung? 
Can you take a thread dump and post that here? You can take the thread dump 
using Server monitor or you can refer to my post 
http://coldfused.blogspot.com/2005/11/thread-dumps.html

however, I see few potential problems in the code
- In the loop, when you fire 10th threads, you join with timeout of 2.5 
seconds, and if by that time, all the threads are not finished, you kill them 
all. So it might happen that threads would not have finished by that time

- If you see the docs and if you see my presentation, everywhere it is said 
that you should use 'terminate' only when absolutely necessary. Don't overuse 
it as it might lead the thread in some inconsistent state. You should code it 
in such way that you don't need to terminate the threads most of the time

- I don't think you should duplicate the catch. get the message from catch and 
set it to the thread. For test purpose you can remove catch and see what is the 
error that you get. 

Always remember that the thread does not write any output or error to the 
response. It will be available in the thread scope.

Hope that helps.
Rupesh 

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Re: The Woes of CFThread -- going out of my mind!

2008-07-10 Thread Rupesh Kumar
Well, Did you check what is the thread doing when you say the Server is hung? 
Can you take a thread dump and post that here? You can take the thread dump 
using Server monitor or you can refer to my post 
http://coldfused.blogspot.com/2005/11/thread-dumps.html

however, I see few potential problems in the code
- In the loop, when you fire 10th threads, you join with timeout of 2.5 
seconds, and if by that time, all the threads are not finished, you kill them 
all. So it might happen that threads would not have finished by that time

- If you see the docs and if you see my presentation, everywhere it is said 
that you should use 'terminate' only when absolutely necessary. Don't overuse 
it as it might lead the thread in some inconsistent state. You should code it 
in such way that you don't need to terminate the threads most of the time

- I don't think you should duplicate the catch. get the message from catch and 
set it to the thread. For test purpose you can remove catch and see what is the 
error that you get. 

Always remember that the thread does not write any output or error to the 
response. It will be available in the thread scope.

Hope that helps.
Rupesh 

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Re: The Woes of CFThread -- going out of my mind!

2008-07-08 Thread Ian Skinner
Well I fail.

Can anybody point out what is fundamentally wrong with this code.  Such 
that it has at least a 50% chance of complete failure resulting in a 
non-responsive ColdFusion server that must be restarted.  What gets me 
is that sometimes it works completely correct and produces all the 
desired files.  The next time, with the exact same code and data, it 
fails and hangs the server, but generates no exceptions or errors.  At 
least none that I have been able to find.





PROCESSING






  







batchRenew_thread#i#
   




   




   
 

   




 


   

 




   

   

   






   




   











   






SLEEPING 
#timeFormat(now(),"hh:mm:ss:l")#   







DONE












#th#


   
#key#:   #cfThread[th][key]#







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