Memory Leak
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Memory Leak
by Jaime Herreros B.
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Dear all,
I have a web system which uses Active4D 402 with 4D Server 2004.5 on Windows XP. I didn't design this, it just came to me.... The thing is that as the users surf memory used by 4D (as shown at the tasks manager in Windows XP) climbs slowly but permanently up till 4D shows a Memory Full error. Active4D is badly used as every page calls a 4D method which returns a blob that is send to the browser using set response buffer. 4D methods generate the full HTML... I know, I know, thats why I started by saying that this system just came to me. Any ideas on where o what to look for? TIA, Jaime _______________________________________________ Active4D-dev mailing list Active4D-dev@... http://mailman.aparajitaworld.com/mailman/listinfo/active4d-dev Archives: http://mailman.aparajitaworld.com/archive/active4d-dev/ |
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Re: Memory Leak
by B. Perkins
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The first thing that comes to mind is that the BLOB that is being
created by 4D is not being cleared after use. Does the code that builds the HTML set the BLOB size to 0 before it builds the page. Runtime explorer (on your server) should be able to easy tell you this. -- Brad Perkins Jaime Herreros wrote: > Dear all, > > I have a web system which uses Active4D 402 with 4D Server 2004.5 on > Windows XP. I didn't design this, it just came to me.... > The thing is that as the users surf memory used by 4D (as shown at the > tasks manager in Windows XP) climbs slowly but permanently up till 4D > shows a Memory Full error. > > Active4D is badly used as every page calls a 4D method which returns a > blob that is send to the browser using set response buffer. 4D methods > generate the full HTML... I know, I know, thats why I started by > saying that this system just came to me. > > Any ideas on where o what to look for? > > TIA, > > Jaime > _______________________________________________ > Active4D-dev mailing list > Active4D-dev@... > http://mailman.aparajitaworld.com/mailman/listinfo/active4d-dev > Archives: http://mailman.aparajitaworld.com/archive/active4d-dev/ > _______________________________________________ Active4D-dev mailing list Active4D-dev@... http://mailman.aparajitaworld.com/mailman/listinfo/active4d-dev Archives: http://mailman.aparajitaworld.com/archive/active4d-dev/ |
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Re: Memory Leak
by aparajita
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> I have a web system which uses Active4D 402 with 4D Server 2004.5 on
> Windows XP. I didn't design this, it just came to me.... Lucky you... > The thing is that as the users surf memory used by 4D (as shown at > the tasks manager in Windows XP) climbs slowly but permanently up > till 4D shows a Memory Full error. Is anyone else having problems with memory usage? I did a test here and saw that memory usage was very slowly climbing, but it wasn't a conclusive test. > Active4D is badly used as every page calls a 4D method which returns > a blob that is send to the browser using set response buffer. If every page is calling a 4D method to generate HTML, there is very little point in using Active4D. I checked my code to see if there is a possible leak when returning a blob from a 4D method or when setting the response buffer, but I couldn't see anything. My first suggestion is to replace all of the calls to 'set response buffer' to 'write blob', see if that has any effect. Regards, Aparajita www.aparajitaworld.com "If you dare to fail, you are bound to succeed." - Sri Chinmoy | www.srichinmoy.org _______________________________________________ Active4D-dev mailing list Active4D-dev@... http://mailman.aparajitaworld.com/mailman/listinfo/active4d-dev Archives: http://mailman.aparajitaworld.com/archive/active4d-dev/ |
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Re: Memory Leak
by B. Perkins
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> > > Is anyone else having problems with memory usage? I did a test here > and saw that memory usage was very slowly climbing, but it wasn't a > conclusive test. > If it is happening the increase is so slow that it is a non-issue. -- Brad Perkins _______________________________________________ Active4D-dev mailing list Active4D-dev@... http://mailman.aparajitaworld.com/mailman/listinfo/active4d-dev Archives: http://mailman.aparajitaworld.com/archive/active4d-dev/ |
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Re: Memory Leak
by Jaime Herreros B.
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El 10-07-2008, a las 12:17, Aparajita Fishman escribió: >> I have a web system which uses Active4D 402 with 4D Server 2004.5 >> on Windows XP. I didn't design this, it just came to me.... > > Lucky you... > > jajajajajajajajajajajajajajajaj >> The thing is that as the users surf memory used by 4D (as shown at >> the tasks manager in Windows XP) climbs slowly but permanently up >> till 4D shows a Memory Full error. > > Is anyone else having problems with memory usage? I did a test here > and saw that memory usage was very slowly climbing, but it wasn't a > conclusive test. > > >> Active4D is badly used as every page calls a 4D method which >> returns a blob that is send to the browser using set response buffer. > > If every page is calling a 4D method to generate HTML, there is very > little point in using Active4D. I know, but rewriting at this moment is not an option. It's obviously planned for near future.... > > > I checked my code to see if there is a possible leak when returning > a blob from a 4D method or when setting the response buffer, but I > couldn't see anything. > > My first suggestion is to replace all of the calls to 'set response > buffer' to 'write blob', see if that has any effect. In fact we used write blob in the beggining and changed it to set response buffer to see the effect. No effect. The calling chain is as follows: (1) the a4d file calls a method in an a4l library agenda.veragenda($textParam1;$textParam2;$textParam3;....) (2) the method in the a4l library calls a 4D method C_BLOB(vx_HTMLBlob) C_BLOB(vx_Dummy) $result := 4DMehod ($theParam1;$textParam2;...;->vx_HTMLBlob) if($result =0) set response buffer(vx_HTMLBlob;"text/html") else writebr("ERROR!!!") End If vx_HTMLBlob:=vx_Dummy (3) 4DMethod receives a pointer to a blob (vx_HTMLBlob) in, say $9. 4DMethod does some stuff (not touching the blob) and calls 4DMethod2 ($theParam1;$textParam2;...;$9). (4) 4DMethod2 calls 4DMethod3 passing the pointer to the blob along. (5) The final method in the chain finally fills the blob which is then sent to the browser with set response buffer. (6) vx_HTMLBlob is assigned a dummy empty blob at the end to clean it from memory (that is not original code, I did it so as to test). Do you see something that might be causing the problem? > > > Regards, > > Aparajita > www.aparajitaworld.com > > "If you dare to fail, you are bound to succeed." > - Sri Chinmoy | www.srichinmoy.org > > > _______________________________________________ > Active4D-dev mailing list > Active4D-dev@... > http://mailman.aparajitaworld.com/mailman/listinfo/active4d-dev > Archives: http://mailman.aparajitaworld.com/archive/active4d-dev/ _______________________________________________ Active4D-dev mailing list Active4D-dev@... http://mailman.aparajitaworld.com/mailman/listinfo/active4d-dev Archives: http://mailman.aparajitaworld.com/archive/active4d-dev/ |
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Re: Memory Leak
by Jaime Herreros B.
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In fact the first thing the code does is setting blob size to 0 before
filling it up... Jaime El 10-07-2008, a las 11:59, Brad Perkins escribió: > The first thing that comes to mind is that the BLOB that is being > created by 4D is not being cleared after use. Does the code that > builds the HTML set the BLOB size to 0 before it builds the page. > Runtime explorer (on your server) should be able to easy tell you > this. > > -- Brad Perkins > > Jaime Herreros wrote: >> Dear all, >> >> I have a web system which uses Active4D 402 with 4D Server 2004.5 >> on Windows XP. I didn't design this, it just came to me.... >> The thing is that as the users surf memory used by 4D (as shown at >> the tasks manager in Windows XP) climbs slowly but permanently up >> till 4D shows a Memory Full error. >> >> Active4D is badly used as every page calls a 4D method which >> returns a blob that is send to the browser using set response >> buffer. 4D methods generate the full HTML... I know, I know, thats >> why I started by saying that this system just came to me. >> >> Any ideas on where o what to look for? >> >> TIA, >> >> Jaime >> _______________________________________________ >> Active4D-dev mailing list >> Active4D-dev@... >> http://mailman.aparajitaworld.com/mailman/listinfo/active4d-dev >> Archives: http://mailman.aparajitaworld.com/archive/active4d-dev/ >> > > _______________________________________________ > Active4D-dev mailing list > Active4D-dev@... > http://mailman.aparajitaworld.com/mailman/listinfo/active4d-dev > Archives: http://mailman.aparajitaworld.com/archive/active4d-dev/ _______________________________________________ Active4D-dev mailing list Active4D-dev@... http://mailman.aparajitaworld.com/mailman/listinfo/active4d-dev Archives: http://mailman.aparajitaworld.com/archive/active4d-dev/ |
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Re: Memory Leak
by aparajita
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> C_BLOB(vx_HTMLBlob)
> C_BLOB(vx_Dummy) > > $result := 4DMehod ($theParam1;$textParam2;...;->vx_HTMLBlob) > > if($result =0) > set response buffer(vx_HTMLBlob;"text/html") > else > writebr("ERROR!!!") > End If > vx_HTMLBlob:=vx_Dummy Hmmm...there are a couple places I could be leaking memory, I will have to investigate further. > (6) vx_HTMLBlob is assigned a dummy empty blob at the end to clean > it from memory (that is not original code, I did it so as to test). Better to use SET BLOB SIZE(0). Regards, Aparajita www.aparajitaworld.com "If you dare to fail, you are bound to succeed." - Sri Chinmoy | www.srichinmoy.org _______________________________________________ Active4D-dev mailing list Active4D-dev@... http://mailman.aparajitaworld.com/mailman/listinfo/active4d-dev Archives: http://mailman.aparajitaworld.com/archive/active4d-dev/ |
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Re: Memory Leak
by Jaime Herreros B.
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When I use SET BLOB SIZE in en a4l method I get an error. Seems that
SET BLOB SIZE is not supported in Active4D... Jaime El 10-07-2008, a las 13:51, Aparajita Fishman escribió: >> C_BLOB(vx_HTMLBlob) >> C_BLOB(vx_Dummy) >> >> $result := 4DMehod ($theParam1;$textParam2;...;->vx_HTMLBlob) >> >> if($result =0) >> set response buffer(vx_HTMLBlob;"text/html") >> else >> writebr("ERROR!!!") >> End If >> vx_HTMLBlob:=vx_Dummy > > Hmmm...there are a couple places I could be leaking memory, I will > have to investigate further. > > >> (6) vx_HTMLBlob is assigned a dummy empty blob at the end to clean >> it from memory (that is not original code, I did it so as to test). > > Better to use SET BLOB SIZE(0). > > Regards, > > Aparajita > www.aparajitaworld.com > > "If you dare to fail, you are bound to succeed." > - Sri Chinmoy | www.srichinmoy.org > > > _______________________________________________ > Active4D-dev mailing list > Active4D-dev@... > http://mailman.aparajitaworld.com/mailman/listinfo/active4d-dev > Archives: http://mailman.aparajitaworld.com/archive/active4d-dev/ _______________________________________________ Active4D-dev mailing list Active4D-dev@... http://mailman.aparajitaworld.com/mailman/listinfo/active4d-dev Archives: http://mailman.aparajitaworld.com/archive/active4d-dev/ |
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Re: Memory Leak
by aparajita
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> When I use SET BLOB SIZE in en a4l method I get an error. Seems that
> SET BLOB SIZE is not supported in Active4D... It will be, in the meantime try: execute in 4d("SET BLOB SIZE(vx_HTMLBlob;0)") One thing I would like you to try: instead of passing a pointer to vx_HTMLBlob, don't pass it at all and just reference that variable in the 4D methods. This will eliminate the possibility of the pointer causing the problem. Regards, Aparajita www.aparajitaworld.com "If you dare to fail, you are bound to succeed." - Sri Chinmoy | www.srichinmoy.org _______________________________________________ Active4D-dev mailing list Active4D-dev@... http://mailman.aparajitaworld.com/mailman/listinfo/active4d-dev Archives: http://mailman.aparajitaworld.com/archive/active4d-dev/ |
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Re: Memory Leak
by Jaime Herreros B.
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I'l try both... give some time as the system is on line and live!!!!
about 100 conections average.... Thanks!!! Jaime Herreros Jefe de Operaciones Colegium S.A La información contenida en esta transmisión es confidencial y está dirigida exclusivamente a el o los destinatarios indicados. Cualquier uso por otras personas que no sean sus destinatarios está sancionado por la ley chilena. Si ha recibido esta transmisión por error, por favor destrúyala y notifique al remitente si corresponde. Las opiniones expresadas en este correo son las de su autor y pueden no ser compartidas por la compañía. Colegium no asume obligaciones ni responsabilidades por el contenido de este correo. Tampoco garantiza que la transmisión de este correo sea segura o libre de errores, y en consecuencia, no responde por virus, pérdidas, destrucción, recepción tardía o incompleta. The information contained herein is confidential and is directed to the intended addressee(s) only. Any use by any other people is sanctioned by the Chilean law. If you have received this transmission in error, please delete it and warn the sender. The opinions expressed in this message are the author's responsibility and may not be the company's. Colegium does not assume obligations nor responsibilities by the content of this mail. It is not guaranteed either that the transmission of this message is safe and/or free from errors or viruses. In consequence Colegium is not responsible for direct or indirect losses, destruction, as well as for delayed or incomplete messages. El 10-07-2008, a las 16:20, Aparajita Fishman escribió: >> When I use SET BLOB SIZE in en a4l method I get an error. Seems >> that SET BLOB SIZE is not supported in Active4D... > > It will be, in the meantime try: > > execute in 4d("SET BLOB SIZE(vx_HTMLBlob;0)") > > One thing I would like you to try: instead of passing a pointer to > vx_HTMLBlob, don't pass it at all and just reference that variable > in the 4D methods. This will eliminate the possibility of the > pointer causing the problem. > > Regards, > > Aparajita > www.aparajitaworld.com > > "If you dare to fail, you are bound to succeed." > - Sri Chinmoy | www.srichinmoy.org > > > _______________________________________________ > Active4D-dev mailing list > Active4D-dev@... > http://mailman.aparajitaworld.com/mailman/listinfo/active4d-dev > Archives: http://mailman.aparajitaworld.com/archive/active4d-dev/ _______________________________________________ Active4D-dev mailing list Active4D-dev@... http://mailman.aparajitaworld.com/mailman/listinfo/active4d-dev Archives: http://mailman.aparajitaworld.com/archive/active4d-dev/ |
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Re: Memory Leak
by aparajita
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> I'l try both... give some time as the system is on line and live!!!!
> about 100 conections average.... The first thing you need to do then is to get yourself a test system. It is suicidal to develop on a production system. Regards, Aparajita www.aparajitaworld.com "If you dare to fail, you are bound to succeed." - Sri Chinmoy | www.srichinmoy.org _______________________________________________ Active4D-dev mailing list Active4D-dev@... http://mailman.aparajitaworld.com/mailman/listinfo/active4d-dev Archives: http://mailman.aparajitaworld.com/archive/active4d-dev/ |
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Re: Memory Leak
by Jaime Herreros B.
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execute in 4d("SET BLOB SIZE(vx_HTMLBlob;0)") had no effect at all...
The other change will be done as soon as we set the test server (which we should have done long ago)... Meanwhile I'll wait for your testing for leaks... Thanks a lot!!! Jaime El 10-07-2008, a las 16:20, Aparajita Fishman escribió: >> When I use SET BLOB SIZE in en a4l method I get an error. Seems >> that SET BLOB SIZE is not supported in Active4D... > > It will be, in the meantime try: > > execute in 4d("SET BLOB SIZE(vx_HTMLBlob;0)") > > One thing I would like you to try: instead of passing a pointer to > vx_HTMLBlob, don't pass it at all and just reference that variable > in the 4D methods. This will eliminate the possibility of the > pointer causing the problem. > > Regards, > > Aparajita > www.aparajitaworld.com > > "If you dare to fail, you are bound to succeed." > - Sri Chinmoy | www.srichinmoy.org > > > _______________________________________________ > Active4D-dev mailing list > Active4D-dev@... > http://mailman.aparajitaworld.com/mailman/listinfo/active4d-dev > Archives: http://mailman.aparajitaworld.com/archive/active4d-dev/ _______________________________________________ Active4D-dev mailing list Active4D-dev@... http://mailman.aparajitaworld.com/mailman/listinfo/active4d-dev Archives: http://mailman.aparajitaworld.com/archive/active4d-dev/ |
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