> What kind of machine are you running these 163/164
> instances of Tomcat on, and when you are running them,
> what /does/ "free" say ?
I have two different servers with 164 instances of tomcat. Both servers
have 2x quad-core 2.8Ghz Xeon processors with 32GB RAM. On the first
server (app03), most instances of tomcat are configured with 64MB of
Java heap. About 20% of them have 96-256MB. I almost never reboot this
server (current uptime 61 days). Here's 'free' from app03.
[r...@app03 ~]# free
total used free shared buffers
cached
Mem: 33265832 30570260 2695572 0 296976
4562784
-/+ buffers/cache: 25710500 7555332
Swap: 2031608 0 2031608
On the other server (app04), all instances of tomcat are configured with
512MB Java heap (-ms512M -mx512M). After 4 or 5 days of uptime, the
server starts to swap a little. Then I reboot it and it is fine for
several more days. As you can see from the following, it is about time
for a reboot. If I do not reboot it tonight, by tomorrow or the next day
it may be up to 1-2GB of swap. (It actually doesn't slow the server down
much though. sar shows that it runs about 90% idle anyway, including
iowait.
[r...@app03 ~]# ssh app04 free
total used free shared buffers
cached
Mem: 33265832 32965812 300020 0 191248
3842092
-/+ buffers/cache: 28932472 4333360
Swap: 2031608 4288 2027320
--
Eric Robinson
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