BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  How to...          BorlandTalk.com Forum Index -> Delphi Internet Winsock View previous topic :: View next topic   Author Message Atmapuri Guest Posted: Tue Nov 11, 2003 7:12 pm    Post subject: How to... Hi! I have 30-60 clients on the Ethernet network. They support UDP, TCP/IP, DataSocket.. All clients send 19200 bytes long blocks of data every 2 seconds. The network can be 100MBit, but 10MBit should work if possible.. (The network should be able to service some other operations also.) My job is to make a single receiver that will collect data from all clients and: - Minimize the network load - Ensure all packets got in or at least know that one has been missed, (but that would signal a hardware error.). I would appreciate if anyone would suggest the protocol to use and any other suggestions how to go about this thing.. I was looking at TPC/IP, but the Indy TCP/IP server creates a separate thread for every connnection. With 60 clients that would be 60 threads. Maybe not a good idea ... Thanks! Atmapuri. Back to top Atmapuri Guest Posted: Tue Nov 11, 2003 8:23 pm    Post subject: Re: How to... Hi! Thank you very much for your reply. Quote: You can use ICS components (TWSocket and TWSocketServer). I uses a totally different programming model: asynchronous and event driven. With ICS, you'll be able to handle as many connections as you like with only a single thread. Of course depending on the load, you may want to use several threads. If your application is just to collect data and store it to a file, I'm sure a single thread will handle the work load you specified. - Minimize the network load It is dependent on your protocol. The bandwidth you need is roughly 19200 * 8 / 2 * 60 * 1.10 = 5Mbps. Humm... I computed about 200kBytes. 19200 is per two seconds... Would that mean the required bandwidth is 2.5 Mbps? Thats pretty important, because I have to have an estimate of the hardware load. Quote: Note that you must also have a disk subsystem abale to handle that throuput continuesly. This is not a problem for most disks, but be aware that the disk could be shared with other tasks ! Not a problem. Data is resolved in memory, only a small fraction gets written. Quote: - Ensure all packets got in or at least know that one has been missed, (but that would signal a hardware error.). That is a job for TCP. Nothing to do for that if you use a TCP stream. You can download ICS full source code (freeware) from http://www.overbyte.be (it is also on Delphi 6/7 companion CD but the version on the website is more up-to-date). There are several sample Tcp servers, either as applications ou services. ICS has a dedicated support mailing list. You should subscribe if you have questions. A team is dedicated to answer your questions, without mention about one thousand subscribers sharing their knowledges. See "support" link at ICS website for details. Thanks a lot... Atmapuri. Back to top Francois PIETTE Guest Posted: Tue Nov 11, 2003 8:32 pm    Post subject: Re: How to... Quote: I have 30-60 clients on the Ethernet network. They support UDP, TCP/IP, DataSocket.. All clients send 19200 bytes long blocks of data every 2 seconds. It is dependent on your protocol. The bandwidth you need is roughly 19200 * 8 / 2 * 60 * 1.10 = 5Mbps. Humm... I computed about 200kBytes. 19200 is per two seconds... Would that 19200 was given in bytes, i divided by two because it is two per second, I multiplied by 8 because it was bytes not bits, I multiplied by 1.10 because of some overhead of TCP/IP protocol. I muliplied by 60 because there are 60 simultaneous connexions. The total gives 5,068,800 bits per second which I roiunded to 5 Mbps. (Note that Mbps is Mega bit per second whils MBps would be Mega Bytes per second). So my computation seems correct to me... Don't you agree with me ? -- Contribute to the SSL Effort. Visit http://overbyte.delphicenter.com/eng/ssl.html -- [email]francois.piette (AT) overbyte (DOT) be[/email] The author for the freeware multi-tier middleware MidWare The author of the freeware Internet Component Suite (ICS) http://www.overbyte.be "Atmapuri" <janez.makovsek (AT) usa (DOT) net> a écrit dans le message de news:3fb14530 (AT) newsgroups (DOT) borland.com... Quote: Hi! Thank you very much for your reply. You can use ICS components (TWSocket and TWSocketServer). I uses a totally different programming model: asynchronous and event driven. With ICS, you'll be able to handle as many connections as you like with only a single thread. Of course depending on the load, you may want to use several threads. If your application is just to collect data and store it to a file, I'm sure a single thread will handle the work load you specified. - Minimize the network load It is dependent on your protocol. The bandwidth you need is roughly 19200 * 8 / 2 * 60 * 1.10 = 5Mbps. Humm... I computed about 200kBytes. 19200 is per two seconds... Would that mean the required bandwidth is 2.5 Mbps? Thats pretty important, because I have to have an estimate of the hardware load. Note that you must also have a disk subsystem abale to handle that throuput continuesly. This is not a problem for most disks, but be aware that the disk could be shared with other tasks ! Not a problem. Data is resolved in memory, only a small fraction gets written. - Ensure all packets got in or at least know that one has been missed, (but that would signal a hardware error.). That is a job for TCP. Nothing to do for that if you use a TCP stream. You can download ICS full source code (freeware) from http://www.overbyte.be (it is also on Delphi 6/7 companion CD but the version on the website is more up-to-date). There are several sample Tcp servers, either as applications ou services. ICS has a dedicated support mailing list. You should subscribe if you have questions. A team is dedicated to answer your questions, without mention about one thousand subscribers sharing their knowledges. See "support" link at ICS website for details. Thanks a lot... Atmapuri. Back to top Remy Lebeau (TeamB) Guest Posted: Tue Nov 11, 2003 9:01 pm    Post subject: Re: How to... "Atmapuri" <janez.makovsek (AT) usa (DOT) net> wrote Quote: I was looking at TPC/IP, but the Indy TCP/IP server creates a separate thread for every connnection. With 60 clients that would be 60 threads. For Indy 9, that is correct. For Indy 10, that will not be the case. In addition to threads, Indy 10 will also support fibers. Long story short, it would be possible to execute 60 fibers within the context of 1-2 actual threads (instead of 60) with little or no performance delays (if anything, performance can be improved by using fibers). Gambit Back to top Atmapuri Guest Posted: Wed Nov 12, 2003 6:43 am    Post subject: Re: How to... Hi! Quote: 19200 was given in bytes, i divided by two because it is two per second, I multiplied by 8 because it was bytes not bits, I multiplied by 1.10 because of some overhead of TCP/IP protocol. I muliplied by 60 because there are 60 simultaneous connexions. The total gives 5,068,800 bits per second which I roiunded to 5 Mbps. (Note that Mbps is Mega bit per second whils MBps would be Mega Bytes per second). So my computation seems correct to me... Don't you agree with me ? I did not understand your formula... Thanks... Atmapuri. Back to top Martin James Guest Posted: Thu Nov 13, 2003 1:03 pm    Post subject: Re: How to... Quote: I was looking at TPC/IP, but the Indy TCP/IP server creates a separate thread for every connnection. With 60 clients that would be 60 threads. Maybe not a good idea ... 60 threads is nothing. My 2k box has 230 threads loaded while doing nothing - just from the system & background stuff. There are 293 threads loaded as I write this mail - no problem. Rgds, Martin Back to top Atmapuri Guest Posted: Thu Dec 04, 2003 6:53 am    Post subject: Re: How to... Hi! Quote: I was looking at TPC/IP, but the Indy TCP/IP server creates a separate thread for every connnection. With 60 clients that would be 60 threads. Maybe not a good idea ... 60 threads is nothing. My 2k box has 230 threads loaded while doing nothing - just from the system & background stuff. There are 293 threads loaded as I write this mail - no problem. Humm... Microsofts recommends that the number of threads per proces should not exceed 16. But it is clear that system wide there are more threads running. Regards! Atmapuri Back to top Chad Z. Hower aka Kudzu Guest Posted: Fri Jan 02, 2004 6:28 pm    Post subject: Re: How to... "Atmapuri" <janez.makovsek (AT) usa (DOT) net> wrote in news:3fced9ed (AT) newsgroups (DOT) borland.com: Quote: Humm... Microsofts recommends that the number of threads per proces should not exceed 16. But it is clear that system wide there are more threads running. This recommendation is too general and was targeted at simple GUI apps. IIS itself runs several hundred threads and this comment was not intended for servers. Outlook alone is using 17 thread on my system right now. -- Chad Z. Hower (a.k.a. Kudzu) - http://www.hower.org/Kudzu/ "Programming is an art form that fights back" Got Indy? 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