Java Cache System Setup

bmf

We have been having memory related issues due to the amount of data being cached by Interwoven. We have already verified and corrected any memory leaks and the component cache settings. The issue is we have abut 1800+ web sites running in interwoven and a large volume of traffic. We were running out of HEAP and I have edited the cache.ccf file limiting the number of items cached. However, I am seeing a compression option which when enabled the site does not respond anymore in production. I am not sure if it is due to the load. With compression turned off there is no issue. Can someone please tell me what the following entry is for in the cache.ccf of the JCS? In addition is there any additional setup required to get it working assuming it will compress the cache?

# cache compression
# 0 - OFF
# 1 - Best performance
# 9 - Best compression
interwoven.cachemanager.compression=0

Also we have two web servers serving the content but they have different settings in the cache.ccf as follows.

jcs.region.stylesheet=

and the other has

jcs.region.stylesheet=DC

My question on this is which is better to use? The indexed disk cache or the default?