Sim-eth-es dedicated server cpu usage

asser_fahrenholz · August 11, 2017, 2:32pm

Hi

I’ve gotten my game hosted, using the dedicated/headless sim-eth-es server. Is it supposed to run at 100% cpu usage (1 core) ? There are no players connected.

Just wondering what I should expect

Damien_M · August 11, 2017, 2:46pm

Real question is,would it be acceptable for you to run a game at 100% CPU?
The game will be lagging so either you’re wasting valuable resources with your implementation or you should host on a better performing PC.

asser_fahrenholz · August 11, 2017, 2:53pm

Okay, så I ran code as is provided by Paul and it does the same (100% usage on one core). Hmm - has anyone got any experience with this ?

pspeed · August 11, 2017, 2:58pm

There is a loop that busy-waits and will gobble available CPU in the process. That CPU is still available to other processes but it will be used by that loop if nothing else is using it, basically.

If you care slightly less about the responsiveness of that loop then you can change a setting that lets it relax a little.

github.com

Simsilica/SimEthereal/blob/master/src/main/java/com/simsilica/ethereal/EtherealHost.java#L140



public ObjectStateProtocol getObjectProtocol() {
    return objectProtocol;
}

public void addListener( StateListener l ) {
    stateCollector.addListener(l);
}

public void removeListener( StateListener l ) {
    stateCollector.removeListener(l);
}

/**
 *  Sets the state collection interval that the StateCollector will use
 *  to pull history from the ZoneManager and deliver it to the clients.
 *  By default this is 1/20th of a second, or 50,000,000 nanoseconds.
 */
public void setStateCollectionInterval( long nanos ) {
    if( stateCollector != null ) {
        throw new RuntimeException("The state collection interval cannot be set once the service is initialized.");

…but actually, it should default to 1 and be fine.

I thought maybe it was set to 0. Maybe it’s something else then.

asser_fahrenholz · August 11, 2017, 4:12pm

I have a friend hosting the game server, and he was just concerned about the cpu usage/power usage.

pspeed · August 11, 2017, 4:23pm

You can try adjusting that value and see if it helps… or use jconsole to see which thread is busy. It could be something else.

asser_fahrenholz · August 11, 2017, 5:38pm

There is an idlesleep time in both GameLoop and StateCollector, can both be adjusted and what would be the immediate consequences of doing so?

pspeed · August 11, 2017, 5:50pm

When you increase the idle time of either loop, you risk that some other process on your machine will be gobbling up so much CPU that the sleep doesn’t return in a timely manner. (Actually, for anything over 0 which is a special number in Java sleep() this will kind of be true.) For the state collector, this means that you might start accumulating too much history and have to drop it on the floor before it goes out. Clients will see jumps in action or be jittery. For the game loop, it means that physics may not update “on time”… which is certainly less critical over all.

asser_fahrenholz · August 11, 2017, 5:52pm

Okay, så for a virtual server (non-windows) dedicated to only hosting this - it could work with adjusted values. Thanks for clarification!