The last time we downloaded it (quite a while back), Jason used oInStream.readLine(aBuffer, aOffset, aLen); Where oInStream is a ServletInputStream, and aLen = 1024 * 100. Whith that it is dependen on the implementation of the underlying servlet engine. You can download the lib at http://www.servlets.com/resources/com.oreilly.servlet/ Especially note the remarks for the update from Oct 29th. 2000: > This version also adds special buffering to to dramatically > improve performance on servers that don't do > their own buffering, including Tomcat 3.2 and earlier So maybe upgrade to a newer version might improve the situation. > -----Ursprüngliche Nachricht----- > Von: Randy Layman [mailto:[EMAIL PROTECTED]] > Gesendet: Freitag, 5. Januar 2001 14:21 > An: '[EMAIL PROTECTED]' > Betreff: RE: Slow upload speeds > > > > Even though its on the same machine, the data still > flows through > the Operating System and into the TCP/IP stack to pop out the > other side on > the same machine, it just didn't cross any networking wires. > That's the > whole point of localhost/127.0.0.1, simulate traffic from the network > without using the wires. > > The problem is still (probably, I haven't seen Jason's code), > fundamentally the number of underlying system calls. This > would be true if > you wrote the program in Java or C or Visual Basic or Perl, > Unix or NT. The > User process has to ask the Operating System for the bytes. > If it asks for > each byte one at a time then it takes a lot more time than if > it asked for > (relatively) big blocks. > > If you could give me a pointer to the source I could > probably find a > little time today to look over this and see how his code > works and if this > is really the problem. (Its possible that he knew about this > problem and > accounted for it, but its a very commonly overlooked issue). > > Randy > > -----Original Message----- > From: Jose Euclides da Silva Junior - DIGR.O > [mailto:[EMAIL PROTECTED]] > Sent: Friday, January 05, 2001 9:33 AM > To: [EMAIL PROTECTED] > Subject: RES: Slow upload speeds > > > > *** PGP-Unterzeichnungsstatus: unbekannt > *** Unterzeichner: Unbekannt, Schlüssel-ID = 0x77054C6D > *** Unterzeichnet: 05.01.01 18:22:06 > *** Verifiziert: 05.01.01 15:02:25 > *** BEGINN DER MIT PGP VERIFIZIERTEN NACHRICHT *** > > Many people have been talked about bad performance when using Jason > code.But, you should tell me some information like available > memory and > availabe disk space When you try to use client and server on the same > machine and the problem still happens, we are able to say > that bottleneck > isnt the reason of the slow speed. > Regards, > > José Euclides Júnior > __________________________________ > E-mail: [EMAIL PROTECTED] > [EMAIL PROTECTED] > [EMAIL PROTECTED] > http://euclides.8m.com > > > -----Mensagem original----- > De: Randy Layman [SMTP:[EMAIL PROTECTED]] > Enviada em: Sexta-feira, 5 de Janeiro de 2001 10:32 > Para: '[EMAIL PROTECTED]' > Assunto: RE: Slow upload speeds > > > I've never dealt with this in Tomcat, but from other > network apps: > How are you using the ServletInputStream - are you calling int > read(), which reads the stream a byte at a time, or are you > calling int > read(byte[])? My experience is that you want to use the > second option, > preferably with the byte[] size equal to 1500 (Reason for > 1500 - its the MTU > (Maximum Transmission Unit) of Ethernet, probably the network > the server is > attached to). > Reason this speeds things up: When calling int read(), > to get 1500 > bytes of input, Java has to make 1500 system calls. If you use int > read(byte[]) then it can get 1500 bytes in one system call. > The reason you > want this byte[] to be the same length as the MTU - you can > read each packet > as it arrives and be processing it as the next packet finds > its way across > the network instead of waiting on the next one. > > One caveat: I have not looked at the source code for > this class, but > from the JavaDoc it appears that all the methods we are > talking about are > inherited from InputStream, so these techniques should work. > > Randy > > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] > Sent: Thursday, January 04, 2001 6:13 PM > To: [EMAIL PROTECTED] > Subject: Slow upload speeds > > > Hi everyone. > > I am using Tomcat-3.2.1 on W2K, Solaris with or without > apache. Since I > need to provide users with functionality to upload fairly big > files (> 10 > MB), speed is essential. > > My uploader is based on Jason Hunter code. Maximum upload > speed I could > achieve is between 40 and 60 Kbytes/s (even when client and > server are on > the same machine). Bottleneck (quiet predictable) seems to be in > ServletInputStream misc. "read()" methods. Speed does not seem to be > dependant on a platform or web server. > > Anyone was able to achieve better speeds (at least around 100 > kBytes/s)? > Any ideas ? > > Thanks > > Andrus > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, email: [EMAIL PROTECTED] > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, email: [EMAIL PROTECTED] > > *** ENDE DER MIT PGP VERIFIZIERTEN NACHRICHT *** > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, email: [EMAIL PROTECTED] > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, email: [EMAIL PROTECTED] > > --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, email: [EMAIL PROTECTED]
