SyncPad Node.js Server Revisited

SyncPad Node.js Server Revisited(blog.mysyncpad.com)

56 points by roder 15 years ago | 15 comments

gcr 15 years ago |

I have this problem too -- with my project, the server right at once uses 100% CPU and memory increases dramatically. During this time, it stops responding to requests. Monit notices this and just restarts it. This happens for me roughly every half-an-hour under very high load.

I'm using JSON parsing but not much else. No dependencies / libraries at all. Are there any steps I can take to provide useful data? Would anyone like me to run it with --prof and hammer it with 'ab' for example?

Here's the code: http://github.com/gcr/goggles

mishmash 15 years ago |

So the results were worse, even though everyone involved thought they would be better on the updated version.

Any theories?

roder 15 years ago | |

I have no idea, I am completely baffled. I really want to try without the node_redis library and do it all in memory, keeping the Array of elements in the returned list at less than 1000.

UPDATE: I should also mention, if you look at the charts, there's a point in time which the CPU hits 99%-100% and it's always reproducible. Once the CPU hits 100% I have just sat back and watched the memory get chewed up.

I'm sure someone w/ more experience than me can probably debug what's going on. The code is there, I really hope someone else can take a look at it. As my friend mentioned, it's reproducible, it can be fixed.

mishmash 15 years ago | | |

Don't know if you'll see this, but as someone playing with both node and erlang, I'd love to hear more about your erlang setup (and your blog was down earlier when I looked).

daleharvey 15 years ago | |

theorising by armchair experts arent always accurate?

That sounds more confrontational than I meant it to, point if you just guess at improvements without testing them, it is still a guess.

mxavier 15 years ago | | |

I'm not sure Ryan Dahl should be considered an armchair expert with respect to Node.js.

davidw 15 years ago |

Erlang has various defects, but it is bomb proof in many ways - it's been out there for many years with many people using it for critical infrastructure.

I'd bet on Node.js and similar efforts for the future, but Erlang is a pretty nice system and well worth looking at and learning from.

geuis 15 years ago |

@roder, can you include the ./config file in your github repo for toyserver.js? Trying to replicate your setup and this is missing.

roder 15 years ago | |

gist was updated, I included a client, which is needed to recreate the issue.

tlrobinson 15 years ago | | |

I think this is the first time I've actually updated a gist I cloned. It all makes sense now.

However, I can't figure out how to run this. I have your toyserver.js (and redis) running, and I have client.html making requests to the server, but the server always returns an empty response. My redis db is empty, is there something I need to do to populate it?