[erlang-questions] My frustration with Erlang

Joel Reymont <>
Fri Sep 12 19:41:10 CEST 2008


On Sep 12, 2008, at 5:35 PM, Hynek Vychodil wrote:

> It not seems as good as I realize from your previous messages. It  
> looks like you can get less than 1kreq/s.

Right.

> I don't know if it is load which you can manage for example 5,  
> 10, ... minutes.

Yes and no, see below.

> You can serve 15k concurrent players. Sound it still to much bad for  
> you?

15K concurrent players would be excellent. The stats I posted before  
don't paint the full picture, though. The part that I didn't post  
looks like this...

Simulating gameplay with 1000 games...
Waiting for games to end...
50 games started, 262 players
100 games started, 504 players
...
950 games started, 4777 players
1000 games started, 5066 players

4 Mnesia overloaded error reports

=ERROR REPORT x 4==== 12-Sep-2008::16:34:40 ===
Mnesia(''): ** WARNING ** Mnesia is overloaded: {dump_log,
                                                             
write_threshold}

And 11 more

=ERROR REPORT x 11 ==== 12-Sep-2008::16:34:44 ===
Mnesia(''): ** WARNING ** Mnesia is overloaded: {dump_log,
                                                               
write_threshold}

And then the real bummer, a whole lot of these:

=ERROR REPORT ==== 12-Sep-2008::16:35:01 ===
** State machine <0.9390.0> terminating
** Last timer event in was 'CHECK'
** When State == dispatch
...
** Reason for termination =
** {timeout,{gen_server,call,[<0.9391.0>,{'SEATS',119}]}}

The above says that even with just 5K players the card game FSM times  
out when requesting seats matching a certain mask, e.g. the reply  
takes longer than 5 seconds. The game bombs out at this point.

I could increase the timeout or make the call just wait forever. I  
don't want to do this, though, as this timeout serves as a performance  
indicator.

	Thanks, Joel

--
wagerlabs.com




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