How much memory should be allocated to the JVM?

[PietBr]

On our server we've seen errors related to Java heap space on a number of occasions: "Error","jrpp-63","02/26/08","04:00:15","FTLAdminApp","Java heap space "Error","jrpp-663","02/21/08","20:38:01","FTLAdminApp","Java heap space "Error","jrpp-323","02/20/08","16:02:29","FTLAdminApp","Java heap space
We suspect we just need to increase the limits currently in place, but would prefer not to do so blindly.
Please advice.

[SafariTECH]

If the server is just a web server running CF and not used for anything else, you can use between 50-80%.

It can also depend on what OS and base server you are using since they may have extended abilities that require memory to process.

One thing I remember reading back when we started using MX6 & 7 was that if you have a dedicated server for web, you should set the Min and Max size to the same level so it doesn;t have to keep managing the memory - it just keeps the same memory available for Java services all the time then.

I've never tested whether there is a great benefit to doing this, but it's the way ours is setup and we don't see any issues with it.

[PietBr]

Thanks for you reply.

We are using Windows 2003 with 8 GB of RAM with ColdFusion 8 on a dedicated Web server which connects to a SQL db server.

I have seen messages which recommend not to use more than 1024 MB, do you agree?


PietBr

[Grizzly9279]

If you're on a 32-bit platform, the most you can reasonably allocate to the JVM is ~1.5GB. Read more here:
http://www.talkingtree.com/blog/index.cfm/2007/8/29/CF8-Performance-64-bit