-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Moran,
Moran Ben-David wrote: >> Apache httpd and Tomcat do not share any memory, so there is not any >> explicit memory-copying going on. > > How do they share data? For example, when Tomcat creates an HTTP > response containing 50k of HTML, I assume that data exists in Tomcat's > memory space. How does that data move over to apache's so it can > respond to the HTTP request. If the apache and tomcat process don't > use any shared buffers (in linux) wouldn't that mean the data is > copied form tomcat's memory space to apache's? Yes, but not explicitly. There's no memcpy or anything like that being performed by either Tomcat or Apache httpd -- it's all being done by the TCP/IP stack. > I guess that actually answers my question: the data is (probably) > copied between tomcat's memory space and apache's (under ajp13). > However, would there be room here for an optimization that uses a > shared_buffer to communicate b/w apache tomcat on the same machine? That process is already significantly improved through the use of the loopback network interface. Remember that everything goes through the TCP/IP stack, even when the two processes are on the same machine. Most TCP/IP stacks have magic loopback devices to improve localhost-to-localhost communication. It is in the TCP/IP stack where your proposed optimization must take place, not in Tomcat or Apache httpd. > However, from my understanding that can also be achieved through the > "jni" mod_jk worker. Do you know of any good documentation on that > worker? Nobody uses the jni worker anymore. The jni worker was intended to be an embedded Tomcat instance running from the mod_jk module, and is only supported in very old versions of Tomcat (3.3 IIRC). > Are there limitations in doing this with newer tomcat's? Yes: it is limited in that it cannot be done. I'll bet you could hack it to work, but it would really suck. > Again.. my apologies for not trying this out first.. I'm only asking > because there seems to be very little in-process documentation out > there (that doesn't reference very old tomcat versions). That's because the JNI options are not applicable to new versions. - -chris -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.7 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFHEn6D9CaO5/Lv0PARAoJBAJ0XAYO3wxRhDv4ZI9UegS0f9yX6rgCfWgD5 5xuaroN1YOCJ06+dV0AgveE= =QnjV -----END PGP SIGNATURE----- --------------------------------------------------------------------- To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
