Hi, I have done alot of work with another servlet container and your consultant is correct. More instances do make a difference. Mainly because certain resources like ports/threads and memory management for the heap it makes sense. But you still need to test to determine what works best.
I agree about the context funkyness. Been there done that. I went from 2 cpu to 6 cpu (AMD not Intel) and then tuned my html page size and that made a huge difference. My own IT group was floored by the performance. My web service response times are down in the 1.5msec range using Tomcat and APR. I used to have around 1msec but I think the CPU management and added cpu count caused that to happen. Remember to turn off services you do not need and use NUMA and any other settings that might help like operand compression for the 64-bit jvm if you use it. Regards, Tony Anecito Founder/CEO MyUniPortal (2010 JavaOne Dukes award) http://www.myuniportal.com ----- Original Message ---- From: John Goodleaf <j...@goodleaf.net> To: users@tomcat.apache.org Sent: Thu, December 9, 2010 2:04:16 PM Subject: Tomcat 6 performance & multiple instances Google is giving me too many different answers! I need to serve a single webapp to a lot of people with acceptable latency. There's no need for multiple contexts or any other funkines. Tomcat 6, JVM 1.6x. I have a hardware load balancer and two 64-bit machines (Windows 2003 Server--not my choice, yes I'd have preferred Linux) each with two CPUs and 8GB RAM. I also have a consultant who insists we need to set up at least two, possibly more, instances of Tomcat on each machine for good performance. I'm more inclined to think that a single instance with tuned Java options will provide the same performance, but be easier to set up and maintain. If I needed to serve different webapps or somehow needed to separate things for some reason, I could see it, but given just the one app/context. it seems like multiple instances really amounts to second-guessing the OS scheduler. Also notable: the servers are VMs. Anyway, I'd appreciate advice, and I don't mind being wrong if you need to side with the consultant. If it needs to be complicated to go fast, then that's what we'll do... Ideally, I'd try both ways and hit it with JMeter, but I lack the time and resources (because mgmt spent the money on our consultant). So I must beg for answers here... Thanks in advance. J --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
