Linode OOM debug

What size Linode are you using? Specifying "-Xms768m -Xmx768m" tells Tomcat to use 768MB ram.

Are you running 64-bit? 64-bit Java uses about twice as much RAM as 32-bit does, so I would strongly recommend against using Java on a 64-bit VPS.

I'd strongly recommend against using a 64-bit VPS to begin with. Unless you're dealing with large amounts of RAM (> 2 or 3 GB), you're likely getting no benefit and simply consuming more RAM.

i've always wondered about 32 v 64 bit - having seen many post that 32 is best - but now i wonder - is 64bit better for large RAM setups ? - like perhaps with Zimba setup on a 1440 ? who uses 64bit and why?

Well, things with heavy math do better with 64-bit. If you do a lot of encryption, you'll have much lower CPU with 64-bit. For example, big Tor nodes run better on 64-bit. Although, at least with Tor, you'll run out of bandwidth much faster than CPU.

@BarkerJr:

Well, things with heavy math do better with 64-bit.

As I recall, 64-bit x86 CPUs have 64 bit integer math, but retain 32-bit floating point math.

James

All on half-bit cpus ?

The old joke… "Windows '95 - A 32 bit patch for a 16 bit interface to an 8 bit OS designed for a 4 bit chip from a 2 bit company that can't stand 1 bit of competition… "

@zunzun:

@BarkerJr:

Well, things with heavy math do better with 64-bit.

As I recall, 64-bit x86 CPUs have 64 bit integer math, but retain 32-bit floating point math.

James

Not really, x86 processors got 64-bit integer math with MMX in the Pentium, and they got 64-bit floating point math with SSE on the Pentium III. x86-64 was never about 64-bit math, it was about increasing the address space.

That said, x86-64 does increase the width of general registers from 32-bit to 64-bit, and it doubles the number of general purpose registers and XMM (SSE) registers.

The advantages for larger RAM come from 32-bit processors only being able to address 4GB of RAM.