The use of persistent connections supported by HTTP 1.1 would certainly improve the performance in most benchmarks, but whether it would improve the performance of an application depends on the particular application. If each real world client will make frequent calls (more frequently than the persistent connection timeout), then HTTP 1.1 would help.
As always, another important consideration is how much speed and throughput your application actually needs. If you need extremely high performance, Apache SOAP will not be the right choice for you. There are a number of other aspects of Apache SOAP that affect performance. One external consideration is the Web server and Web (servlet) container you use. The Tomcat implmentation of these is much slower than others. A real life application of mine had a five-fold round-trip response time improvement by running the Apache SOAP server on IIS and JRun rather than Tomcat (3.2.1, I believe). Within Apache SOAP itself, one bottleneck for large payloads (> 2k or so) is the default client network implementation, which uses the Java default 512 byte buffers. There is a method added to the transport code to allow one to set a larger buffer. Making this 4k can halve the round trip time for large payloads. Another bottleneck is that the receiver of a message will construct an entire DOM for that message. For larger XML structures, this is very costly to performance. The Apache follow up to Apache SOAP, a project known as Axis, uses SAX, I believe, to parse a message stream in a more CPU-efficient manner. If you find that Apache SOAP's performance is not suitable for your application, but you wish to remain in the open source world, Axis is certainly a place to look. I am not sure whether WASP is open source or not. There are other free implementations, although not open source. Graham's GLUE is available for free in some circumstances. Scott ----- Original Message ----- From: "Maris, Barbara" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]> Cc: "Herreman, Christophe" <[EMAIL PROTECTED]> Sent: Monday, January 21, 2002 10:15 AM > Hi, > > I have a little problem, I hope someone can help me. At the moment, I have > an apache soap (version 2.2) client and server up and running on the same > PC. Using the TCP tunneling GUI, I noticed that the client uses http 1.0, > while the server uses http 1.1. Graham Glass pointed out that one needs to > use http 1.1 persistent connections in order to get reasonable performancy. > Looking at HTTPUtils.java, I noticed that the use of http 1.0 is hard coded, > can anybody explain to me why this is done? Are there other possible causes > of my performancy problem? > > Thanks, > > Barbara Maris _________________________________________________________ Do You Yahoo!? Get your free @yahoo.com address at http://mail.yahoo.com
