f



RE: [tao-users] TAO Load Balancing #2

Hi,

See cvs.doc.wustl.edu how you can reach the cvs server and there you can see
in TAO/ChangeLog what has been changed in overview.

Johnny 

> -----Original Message-----
> From: Jasper, Alexander [mailto:alexander.jasper@lineas.de] 
> Sent: vrijdag 15 juli 2005 10:45
> To: jwillemsen@remedy.nl; tao-users@cs.wustl.edu
> Subject: AW: [tao-users] TAO Load Balancing
> 
> Hi,
> 
> thank you for the reply. I think you misunderstood me.
> What I'm asking for was basically, if that is supposed to 
> work on Win32 at all.
> I commented out the lines to get it to work locally and to 
> indicate that in those lines there is a problem. Or would 
> have found it more helpful, if I had told you file and line 
> numbers? I doubt it. And it simply was the easiest thing to 
> do, just to generate the patch file with all fixes at once. 
> (Ok, I admit commenting out is not a fix in usual sense ;))
> 
> What kind of changes were done to load balancer? Is the issue 
> with TRANSIENT exception (see below) resolved?
> 
> Thanks for any answers.
> 
> 
> kind regards
> 
> Alex
> 
> 
> 
> -----Urspr�ngliche Nachricht-----
> Von: Johnny Willemsen [mailto:jwillemsen@remedy.nl]
> Gesendet: Freitag, 15. Juli 2005 09:44
> An: Jasper, Alexander; tao-users@cs.wustl.edu
> Betreff: RE: [tao-users] TAO Load Balancing
> 
> 
> Hi,
> 
> > I'm currently writing my master thesis about "A High-capacity 
> > Airline Crew Planning System".
> > The System I'm dealing with is based on a 3-Tier architecture 
> > using Tao as Corba Orb.
> > 
> > The most important thing is scalability wrt. memory usage. 
> > That is, currently the server is consuming up to 2 GM of 
> > memory on Win32 and... crashes. Hence the data has to be 
> > distributed among several processes on multiple machines, maybe.
> > 
> > I'm thinking of employing the TAO load balancing service for 
> > this purpose. I've read most the papers form Doug's web-page 
> > on this topic. But unfortunately there is still a lack of 
> > documentation.
> > 
> > By now I managed to get the example and seemingly the tests 
> to work. 
> > I had to make some fixes, though. I attached these to this 
> > mail. Please keep in mind that 
> > in some cases this are just "quick fixes" and do not solve 
> > the problem's root cause.
> > 
> > * In LoadManager I hat to comment out some reactor stuff that 
> > was used to do a proper shut down. I did not mange to get 
> > that to work. Even with using the svc.conf file, apparently 
> > supplied for that purpose, the stuff refused to workon Win32.
> > This also prevented the Tests form working. Either I'm doing 
> > s.th. wrong here or someone with more knowledge then me 
> > should take a look at that stuff.
> 
> Commenting out things is always not a good thing todo. You can do it
> locally, but don't send it in as patches. There are some 
> changes for the
> load balancer in the upcoming x.4.7. 
> 
> Regards,
> 
> Johnny Willemsen
> Remedy IT
> Postbus 101
> 2650 AC  Berkel en Rodenrijs
> The Netherlands
> www.theaceorb.nl / www.remedy.nl  
> 
> > * My clients calling an (adaptively) load balanced object 
> > receive a TRANSIENT exception sometimes while trying to issue 
> > a call to that object. My debugging so far seems to support 
> > assumptions that this happens in case the replica currently 
> > in use is overloaded. In that case a transient exceptions 
> > thrown by the interceptor. This does not happend always. In 
> > many cases the load shedding does work corrtly, ie. the 
> > LOCATION_FORWARD is done.
> > The question here, is why the overloaded replica did receive 
> > that call at a all. A LOCATION_FORWARD should have been done 
> > beforehand. It seems to be some kind of race condition here. 
> > Maybe the forwarding is done and the data of the method call 
> > is already in the input buffer, or stuff like that. 
> > I had to catch the exception on client side to prevent the 
> > client form stopping due to the transient exception.
> > Is this exception expected behavior. Shouldn't the client do 
> > the retry transparently?
> > 
> > The other fixes are quite obvious.
> > 
> > Tanks in advance for any hints about the problems described above.
> > 
> > kind regards
> > 
> > Alex 
> > 
> 
> 











































































































0
Johnny
7/15/2005 9:59:45 AM
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AW: [tao-users] TAO Load Balancing #2
Hi Dan! thanks for your suggestion. We utilize this technology already on some of our production systems. The nice thing about that stuff is that it works completely transparently to the application. The only thing we had to change was a linker option if I remember correctly. Unfortunately not even 3 GB is enough ;(. This is strongly related to the heap management of current OS and MMUs in CPUs. They are build with the assumption that the virtual address space is A LOT larger than the physical memory available. In modern 32-bit server machines the opposite is the case. We already use some third party highly optimized heap manager but we still suffer from waste mainly due to "reserving" memory that will never be committed. But the VM-space is lost nevertheless. This in conjunction with the "3GB" technology this leads to 2 GB effectively usable committed memory. Win32 also supports some very advanced stuff with mapping additional pages in to 32-bit address space. This way one can access arbitrary amounts of memory. But of course transparency is lost. One has to take major effort to make use of this and I think in most one will have too redesign one's application. But thanks for the suggestion anyway. kind regards Alex > -----Urspr�ngliche Nachricht----- > Von: Dan Halbert [mailto:halbert@bbn.com] > Gesendet: Freitag, 15. Juli 2005 16:29 > An: Jasper, Alexander > Cc: tao-users@cs.wustl.edu > Betreff: Re: [t...

RE: [tao-users] ACE+TAO on uClinux #2
Hi, Please always use the PRF form. GCC 2.95.3 is still supported, we are using it for example for VxWorks. Regards, Johnny Willemsen Remedy IT Postbus 101 2650 AC Berkel en Rodenrijs The Netherlands www.theaceorb.nl / www.remedy.nl > -----Original Message----- > From: owner-tao-users@cse.wustl.edu > [mailto:owner-tao-users@cse.wustl.edu] On Behalf Of Keith Nicewarner > Sent: vrijdag 10 juni 2005 3:22 > To: Keith Nicewarner; tao-users@cs.wustl.edu > Subject: RE: [tao-users] ACE+TAO on uClinux > > FYI, I managed to get ACE and TAO to compile for the > ColdFire. The few simple ACE tests I tried seem to work > fine, but the simplest CORBA client and server apps get a seg > fault. :-( > > > > I was forced to use gcc 2.95.3 due to some bugs with the gcc > 3.4.3 ColdFire cross compiler, so I'm wondering if that has > something to do with it. Is 2.95.3 still fully supported with TAO? > > > > Keith. > > > > ******************************************************** > > Dr. Keith Nicewarner keith.nicewarner@spacedev.com > <mailto:keith.nicewarner@spacedev.com> > > Chief Software Architect 858-375-2079 > > SpaceDev, Inc. www.spacedev.com > <http://www.spacedev.com> > > 13855 Stowe Drive San Diego, CA, 92064 > > ...

AW: [tao-users] TAO Load Balancing #2
Hi Ossama! first of all thanks for extensive reply. It was helpful indeed. > -----Urspr�ngliche Nachricht----- > Von: Ossama Othman [mailto:ossama@dre.vanderbilt.edu] > Gesendet: Freitag, 15. Juli 2005 12:04 > An: Jasper, Alexander > Cc: tao-users@cs.wustl.edu > Betreff: Re: [tao-users] TAO Load Balancing > > > Hi, > > On Thu, 2005-07-14 at 21:28 +0200, Jasper, Alexander wrote: > > * In LoadManager I hat to comment out some reactor stuff > that was used > > to do a proper shut down. I did not mange to get that to work. Even > > with using the svc.conf file, apparently supplied for that purpose, > > the stuff refused to workon Win32. > > This also prevented the Tests form working. Either I'm doing s.th. > > wrong here or someone with more knowledge then me should take a look > > at that stuff. > > This is a known problem. On Win32, we use asynchronous > signal handling > to perorm graceful shutdowns of the LoadManager. However, the TP > Reactor is used by default on Win32, which is the cause of > the problem. > The TP reactor doesn't support signal handlers. Ok. I thought the reactor was switched by the config file to get around this. But this is not that critical. We are just talking about shut down, aren't we ;). BTW. I'm using the example provided with TAO (TAO/orbsvcs/examples/LoadBalancing) to do my testing. I ha...

AW: [tao-users] TAO Load Balancing #2
Hi, thanks for the hint. If I'm not mistaken most of the changes to the LB are related to changes in the portable interceptor library. I guess I will have to wait for the next release to find out if that fixes my problem with the transient exception. Or does/did any body else have problems with the TRANSIENT exceptions in conjuction with the load balancing. BTW. The bugs in TAO/orbsvcs/examples/LoadBalancer have not been fixed in cvs up to now. kind regards Alex -----Urspr�ngliche Nachricht----- Von: Johnny Willemsen [mailto:jwillemsen@remedy.nl] Gesendet: Freitag, 15. Juli 2005 10:47 An: Jasper, Alexander; tao-users@cs.wustl.edu Betreff: RE: [tao-users] TAO Load Balancing Hi, See cvs.doc.wustl.edu how you can reach the cvs server and there you can see in TAO/ChangeLog what has been changed in overview. Johnny > -----Original Message----- > From: Jasper, Alexander [mailto:alexander.jasper@lineas.de] > Sent: vrijdag 15 juli 2005 10:45 > To: jwillemsen@remedy.nl; tao-users@cs.wustl.edu > Subject: AW: [tao-users] TAO Load Balancing > > Hi, > > thank you for the reply. I think you misunderstood me. > What I'm asking for was basically, if that is supposed to > work on Win32 at all. > I commented out the lines to get it to work locally and to > indicate that in those lines there is a problem. Or would > have found it more helpful, if I had told you file and line > numb...

[tao-users] Re: TAO #2 #2
Hi Martin, Please make sure to send all questions related to TAO to the TAO mailing list or ACE+TAO newsgroup, rather than to comp.object.corba directly. See http://www.cs.wustl.edu/~schmidt/TAO-mail.html for more info on how to access these resources. >> Is there any particular reason for the excessive use of C++ macros >> throughout the entire ACE/TAO codebase? ACE+TAO use macros to improve portability across OS platforms and C++ compilers configurations. If you have suggestions on how to achieve this portability without using macros please let us know. Moreover, dependin...

Re: [tao-users] How to cmpile ACE.TAO.5.7.4 using VC++ 2010 beta 2 #2
Sorry, I was only suggesting that as a workaround until the VC10 format is generated by mpc. -----Original Message----- From: Johnny Willemsen [mailto:jwillemsen@remedy.nl]=20 Sent: 30 October 2009 08:30 To: Victor Kirk; tao-users@list.isis.vanderbilt.edu Subject: RE: [tao-users] How to cmpile ACE.TAO.5.7.4 using VC++ 2010 beta 2 Hi, > For beta 1 I generated vc9 projects and then used VS 2010 to convert=20 > the projects without problems. That is true for beta 1, but the beta 2 project file format got radically changed. Johnny ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please visit http://www.messagelabs.com/email=20 ______________________________________________________________________ This e-mail and any attachments are for the intended addressee(s) only and may contain confidential and/or privileged material. If you are not a named addressee, do not use, retain or disclose such information. This email is not guaranteed to be free from viruses and does not bind Serco in any contract or obligation. Serco Limited. Registered in England and Wales. No: 242246 Registered Office: Serco House,16 Bartley Wood Business Park, Hook, Hampshire RG27 9UY United Kingdom. Help cut carbon...please don=E2=80=99t print this e-mail unless you reall= y need to. ...

RE: [tao-users] RE: [ace-users] XML service configuration no longer works with ACE/TAO 5.4.5/1.4.5
Hi, > > Hi Lothar > > > > > � � ACE VERSION: 5.4.5 > > > > Thanks for using the PRF form. Could you try to find the > problem and send > > us patches to fix this? > > > > Regards, > > > > Johnny Willemsen > > I have no problem committing some time to the problem. I do > however know as > much as nothing about the ACE XML parser and it's recent > changes. It seems to > me that (some) of the recent changes might have caused the > test failures. So > if someone working actively on ACEXML gives me directions I > am willing to > spend my time investigating the problem. I can't remember that work has been done the last months so I am also amazed things broke. Nobody is actively working on it, so I think there are not much directions at this moment. Regards, Johnny Willemsen Remedy IT Postbus 101 2650 AC Berkel en Rodenrijs The Netherlands www.theaceorb.nl / www.remedy.nl On Wednesday 18 May 2005 11:01, Johnny Willemsen wrote: > Hi, > I can't remember that work has been done the last months so I am also > amazed things broke. Nobody is actively working on it, so I think there are > not much directions at this moment. Well, it did definiteley work with 5.4.4. So any changes that broke it must have been made between 5.4.4 and 5.4.5. I also read in the release email of 5.4.5 in the CIAO...

[tao-users] Load Balancing (Was RE: Questions about TAO and CIAO)
Hi All, > > My next question is with regard to the Load Balancing service. From the > > website, the load balancer is based on the latest revision of the > > proposed specification, so I understand that to mean there is no > > official OMG load balancing spec as yet. > > I believe that's the case, though I think the OMG is working on this > in a working group. > > > Does that mean that all servers in my system must be written in TAO > > in order to support load-balancing? > > No, it just means that if you use other ORBs they would need to > support certain CORBA features, e.g., location forwarding. This confuses me. I have not yet had time to learn the concepts of load balancing very much but I assume there is a server process which mediates between clients and server replicas. The client sends a message to the mediator (the load balancer service) then the load balancer determines which replica to send the message to based on load (by whatever means). If this is correct (and I apologise in advance if it isn't!) then... If I implement my client in Java I can use JacORB to send a message to the load balancer, but the fact remains that the load balancer itself is part of TAO. Therefore, I can't use JacORB without TAO unless of course, JacORB supports load balancing directly (which should've been my original question!). Thanks, Paul Drummond This e-mail and any att...

Re: [tao-users] ACE+TAO scripts #! line #2
Dale- > > > > I know of two ways around this without embedding explicit paths to > > > > perl in the header: > > > > > > > > 1) use the "magic perl" line which redirects a shell script to > > > > become a perl script. ACE/TAO uses this in many places afaicr. The > > > > top of the script becomes much more portable since you can count on > > > > /bin/sh being in place: > > > > > > > > #!/bin/sh > > > > eval '(exit $?0)' && eval 'exec perl -w -S $...

RE: [tao-bugs] Re: [tao-users] Compile error in SSLIOP (TAO 1.4.2)
Hi, > > TAO VERSION: 1.4.2 > > ACE VERSION: 5.4.2 > [snip] > > > C:\ACE_wrappers\TAO\orbsvcs\orbsvcs\SSLIOP\SSLIOP_ClientCredentials.cp > > p(13) : error C2661: 'Credentials::Credentials' : no overloaded > > function takes 2 parameters > > > C:\ACE_wrappers\TAO\orbsvcs\orbsvcs\SSLIOP\SSLIOP_ClientCredentials.cp > > p(13) : error C2512: 'Credentials::Credentials' : no appropriate > > default constructor available SSLIOP_Connection_Handler.cpp > > SSLIOP_Connector.cpp > > > C:\ACE_...

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