Should I be able to crash 4D Server?
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Should I be able to crash 4D Server?
by psmith-3
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Hi,
I had a pretty frustrating day. I was doing a demo of the performance of v11 versus 2004 for one of my biggest customers (yes, it is much faster). The customer is looking at possibly dramatically increasing the number of seats from 80 to 120, possibly later to 200 - or abandoning my solution. At the end of the demo, 4D Server v11 crashed. The crash happened when the only connected client quit. Actually, the client hung while attempting to quit. I imagine there is something in my code, somewhere, which has been running fine on 2004 for several years, but which made v11 4D Server unstable. Then, on quitting, the server happened to crash - probably when doing some internal housekeeping related to closing the connection. My question, which is kind of an offshoot of the "Multiple core" thread, is should we be _able_ to crash the server? I suspect the single, cooperative thread on 4D Server is its weakest link. I would hope that threads could terminate abnormally without crashing an entire server, but perhaps not that all-important cooperative thread. I haven't worked with Oracle for a couple of decades. I've never worked with SQL Server or Sybase. Can a developer willfully execute code which would crash one of those servers? It would make me feel a little better if the answer was "yes". (;-<) Paul Smith TSE International ********************************************************************** Get the speed and power of 4D v11 SQL before upgrade prices increase - http://www.4d.com 4D Internet Users Group (4D iNUG) FAQ: http://lists.4d.com/faqnug.html Archive: http://lists.4D.com/archives.html Options: https://lists.4d.com/mailman/options/4d_tech Unsub: mailto:4D_Tech-Unsubscribe@... ********************************************************************** |
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Re: Should I be able to crash 4D Server?
by John DeSoi
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On Nov 11, 2009, at 11:08 AM, psmith wrote: > My question, which is kind of an offshoot of the "Multiple core" > thread, is should we be _able_ to crash the server? I suspect the > single, cooperative thread on 4D Server is its weakest link. I would > hope that threads could terminate abnormally without crashing an > entire server, but perhaps not that all-important cooperative thread. > > I haven't worked with Oracle for a couple of decades. I've never > worked with SQL Server or Sybase. Can a developer willfully execute > code which would crash one of those servers? It would make me feel a > little better if the answer was "yes". (;-<) I can't speak for the above databases, but with PostgreSQL each connection runs in a separate process. It was designed this way to make it difficult or impossible for a client connection to crash the server process. And of course it allows the server to take advantage of any number of CPUs/cores. John DeSoi, Ph.D. ********************************************************************** Get the speed and power of 4D v11 SQL before upgrade prices increase - http://www.4d.com 4D Internet Users Group (4D iNUG) FAQ: http://lists.4d.com/faqnug.html Archive: http://lists.4D.com/archives.html Options: https://lists.4d.com/mailman/options/4d_tech Unsub: mailto:4D_Tech-Unsubscribe@... ********************************************************************** |
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Re: Should I be able to crash 4D Server?
by Alan Chan
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John,
You're bad:-) Alan Chan 4D iNug Technical <4d_tech@...> writes: >And of course it allows the server to take advantage >of any number of CPUs/cores. ********************************************************************** Get the speed and power of 4D v11 SQL before upgrade prices increase - http://www.4d.com 4D Internet Users Group (4D iNUG) FAQ: http://lists.4d.com/faqnug.html Archive: http://lists.4D.com/archives.html Options: https://lists.4d.com/mailman/options/4d_tech Unsub: mailto:4D_Tech-Unsubscribe@... ********************************************************************** |
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Re: Should I be able to crash 4D Server?
by Peter Schumacher-2
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Might happen, depending on the code. v11 changed a lot of the old
tricks. Can you reproduce it? ...and more interesting, which version of v11 did you use? The is a whole bunch of this breed... :) Am 11.11.2009 um 09:08 schrieb psmith: > I imagine there is something in my code, somewhere, which has been > running fine on 2004 for several years, but which made v11 4D Server > unstable. Then, on quitting, the server happened to crash - probably > when doing some internal housekeeping related to closing the > connection. Greetings, [4D-Consulting.com]eK, Wiesbaden (Germany) Peter Schumacher -------------------------------------------------------- Web: http://www.4D-Consulting.com/ FreeCall: 0800-434 636 7 Tel.: +49-611-9406.850 - Fax: +49-611-9406.744 4D-Consulting.com eK - Scharnhorststr. 36 - 65195 Wiesbaden Member of the German Developer Network http://www.die4dwerkstatt.de ********************************************************************** Get up to $600 to spend on Amazon.com this holiday season - http://www.4d.com/serverpromo.html 4D Internet Users Group (4D iNUG) FAQ: http://lists.4d.com/faqnug.html Archive: http://lists.4D.com/archives.html Options: https://lists.4d.com/mailman/options/4d_tech Unsub: mailto:4D_Tech-Unsubscribe@... ********************************************************************** |
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Re: Should I be able to crash 4D Server?
by psmith-3
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Peter,
It doesn't happen regularly. In fact, it seems random. v11.4 hf7 on Windows 2003. Paul Smith TSE International > Might happen, depending on the code. v11 changed a lot of the old > tricks. Can you reproduce it? ...and more interesting, which version > of v11 did you use? The is a whole bunch of this breed... :) ********************************************************************** Get up to $600 to spend on Amazon.com this holiday season - http://www.4d.com/serverpromo.html 4D Internet Users Group (4D iNUG) FAQ: http://lists.4d.com/faqnug.html Archive: http://lists.4D.com/archives.html Options: https://lists.4d.com/mailman/options/4d_tech Unsub: mailto:4D_Tech-Unsubscribe@... ********************************************************************** |
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Re: Should I be able to crash 4D Server?
by t anthony breen
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You may want to review your plug-ins. We had a similar experience
years ago when a fax plug-in was executing some code when the client quit that would result in the server crashing (and many data recoveries until we figured it out). t anthony breen Subito Systems --------------------------------------------------------------------- I went to a bookstore and asked the saleswoman, "where's the self- help section?" She said if she told me, it would defeat the purpose... On Nov 11, 2009, at 8:08 AM, psmith wrote: > Hi, > > I had a pretty frustrating day. I was doing a demo of the > performance of v11 versus 2004 for one of my biggest customers > (yes, it is much faster). The customer is looking at possibly > dramatically increasing the number of seats from 80 to 120, > possibly later to 200 - or abandoning my solution. At the end of > the demo, 4D Server v11 crashed. The crash happened when the only > connected client quit. Actually, the client hung while attempting > to quit. > ********************************************************************** Get up to $600 to spend on Amazon.com this holiday season - http://www.4d.com/serverpromo.html 4D Internet Users Group (4D iNUG) FAQ: http://lists.4d.com/faqnug.html Archive: http://lists.4D.com/archives.html Options: https://lists.4d.com/mailman/options/4d_tech Unsub: mailto:4D_Tech-Unsubscribe@... ********************************************************************** |
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Re: Should I be able to crash 4D Server?
by psmith-3
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Hi,
Thanks for the suggestion. We're just using 4D Write, 4D Internet commands and 4D Pack. The server sometimes just seems to crash... even if none of the plugins have been used. Often, the "client" will not quit correctly. This can cause the server to crash. Paul Smith TSE International > You may want to review your plug-ins. We had a similar experience > years ago when a fax plug-in was executing some code when the client > quit that would result in the server crashing (and many data > recoveries until we figured it out). > > > t anthony breen > Subito Systems ********************************************************************** Get up to $600 to spend on Amazon.com this holiday season - http://www.4d.com/serverpromo.html 4D Internet Users Group (4D iNUG) FAQ: http://lists.4d.com/faqnug.html Archive: http://lists.4D.com/archives.html Options: https://lists.4d.com/mailman/options/4d_tech Unsub: mailto:4D_Tech-Unsubscribe@... ********************************************************************** |
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