How to find causes for the casandra killing frequently?

I'm trying to install and configure cassandra programmatically using a shell script. I install cassandra, run ./cassandra and then I try to load the schema using cassandra-cli --host localhost -f <schema-file>. The problem is that it tries to load the schema before cassandra is up and throws an exception. Is there any way to know when cassandra is up and running?

Thanks!

we have a server with 8GB, running mysql, 4 java applications and a small postgres db.

In my Ubuntu 11.10 VPS, Before I run the jar file:

# free -m total used free shared buffers cached Mem: 256 5 250 0 0 0 -/+ buffers/cache: 5 250 Swap: 0 0 0

Run a jar file that limited to maximum of 32M memory:

java -Xms8m -Xmx32m -jar ./my.jar

Now the memory

I have two servers, server1 and server2. Both of them are identical HP blades, running the exact same OS (RHEL 5.5).

can anyone tell me where the memory is gone: (no, this time neither buffers nor cache)

# free total used free shared buffers cached Mem: 3928200 3868560 59640 0 2888 92924 -/+ buffers/cache: 3772748 155452 Swap: 4192956 226352 3966604

top, sorted by memory, descending:

top - 13:42:06 up 1 day, 3:47, 2 u

OS:Xen Cloud Platform 1.1 (XCP) modified centos, and xen server 5.0 running on intel i5

free -m

total used free shared buffers cached

Mem: 309 136 172 0 1 17

-/+ buffers/cache: 117 191

Swap: 511 7 504

df -h

none 380M 0 380M 0% /de

Here is my situation. I have two servers.

The following three outputs were taken essentially simultaneously:

top:

top - 02:54:36 up 2 days, 13:50, 3 users, load average: 0.05, 0.05, 0.09 Tasks: 181 total, 1 running, 179 sleeping, 0 stopped, 1 zombie %Cpu(s): 2.5 us, 0.8 sy, 0.0 ni, 96.6 id, 0.1 wa, 0.0 hi, 0.0 si, 0.0 st KiB Mem: 16158632 total, 11234480 used, 4924152 free, 844 buffers KiB Swap: 16777212 total,

I have an issue where when I try to build a really large project, my machine starts swapping (several GB) even though there's plenty of memory (14 GB in fact).