On 12/28/10 3:18 PM, Don Hill wrote:Umm.. switch to using mod_proxy_ajp, as the apache documentation suggests ?What I really want to know is there a better design that I should use to gain performance.
It offers a binary interface and much improved speed.Why ? Because we are on 1.3 and the MaxClients is hard defaulted to 256. There are 4 JVM's behind one server and I believe that this could be a bottleneck, not allowing > 256 requests to be handled at a time.
for example
1.) create multiple HTTPD servers, 2 servers per machine. Each serving 2 tomcats JVM
Is your tomcat setup not multithreaded ? Sure it is but seems we are limited to the number of requests being served by httpd 1.3That doesn't really make any sense. You can load balance connections, but what does "load balance through vhosts" mean ? ah, We have a F5 load balancer doing the balancing against the 4 vhosts for each application
2.) use load balancer in workers to handle the load balance to the JVM's. The current configuration is balancing through the vhosts and each vhost has a worker for a JVM instance.You're joking.
On Mon, Dec 27, 2010 at 9:05 PM, Don Hill <justj2ee@xxxxxxxxx> wrote:
Hi.
I am working on a tomcat 5.5 cluster which is using ajp/1.3 and mod_jk and trying to determine the best cluster design given the hardware. I have 2 xeon 2.3 ghz 2 CPU machines with 38GB ram machine. Currently here is the config I am using. The TOMCAT and HTTPD servers are on the same physical machine.
Each machine is running HTTPD 1.3 with prefork,
Apache 1.3 is EOL. No longer supported. d-e-d-d DEAD.Shit yes - replace apache by something from this century. 2.2.17 is current.
the MaxClients is 256 due compiled in limits. Each machine has 4 virtualhosts running through one instance of HTTPD. Two of the VHOSTS are the same app running on 2 Tomcat 5.5 with 8GB RAM(configured by customer). The workers are configured to each VHOST meaning for each machine there are 4 workers defined and one worker is defined for each VHOST. I will try and depict this below. The current load balancing is controlled by F5 and manages the load across 2 machines, 4 VHOST for each app.
Based on this info can someone recommend if this configuration could be improved and if so what would you recommend ?
Then proceed to learn all about mod_proxy_balancer, which was made for this kind of setup.
-- J.
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