I noticed a couple of warnings when rebuilding my container: WARNING: The TCP backlog setting of 511 cannot be enforced because /proc/sys/net/core/somaxconn is set to the lower value of 128. WARNING overcommit_memory is set to 0! Background save may fail under low memory condition. To fix this issue add ‘vm.overcommit_memory = 1’ to /etc/sysctl.conf and then reboot or run the command sysctl vm.overcommit_memory=1’ for this to take effect WARNING you have Transparent Huge Pages (THP) support enabled in your kernel. This will create latency and memory usage issues with Redis. To fix this issue run the command ‘echo never > /sys/kernel/mm/ transparent_hugepage/enabled’ as root, and add it to your /etc/rc.local in order to retain the setting after a reboot. Redis must be restarted after THP is disabled. My question: are these just some warnings to be ignored? If they should not be ignored (I do feel that my discourse forum is extremely slow), then what exactly should be done? To start with: are these paths and files that the warnings refer to inside or outside the container? If they’re inside, I have no idea how to manipulate them… :confused:

By “sustained”, I meant “more than the occasional “flicker” of a non-zero”. That swap activity, especially when you hit the wordpress page, indicates that you’re swapping like crazy. For instance, at 5000 pages swapped in per second, that’s 20 megabytes per second of data being read off disk. It’s not surprising that your performance is not, to put it mildly, optimal.

[image] codinghorror: 90% of Discourse performance is having a CPU with very fast single threaded performance. The other 10% is having enough memory for the number of maximum concurrent active logged in users your site receives. I’m on a 1 GB DigitalOcean droplet. My Forum currently has three users, two of which are system and discobot. There is no traffic except for my own and the odd web crawler. Still, some pages take way over a second to load. Sometimes 2 or 3. Normal?

That’s very bizarre. I would turn off any third party plugins you have. Digital Ocean isn’t blazing CPU or anything but it is reasonable™ speed.

I installed third party plugins for the first time only this weekend. The speed was slow already before that.

Definitely odd. It is possible you have a bad droplet with a “noisy neighbor” who is eating lots of shared CPU. For Discourse, as I said, most of performance is indeed CPU.

I was getting faster page load times than 1-3 sec on a 1 GB free tier AWS (Ubuntu 16.04) with 1.8 million posts. I’ve bumped it to a 2GB instance, and the page loads are a bit faster. posts:rebake isn’t exactly snappy, but for a sandbox ok. (I changed all 3 of the settings you mention in your first post - this made no difference whatsoever to page loads, or anything else as far as I could tell). Is this an import? What does htop show?

[image] JagWaugh: Is this an import? What does htop show? I don’t know what an import is but here is htop: [image]

Is this just an empty forum with no posts in it, or have you imported or otherwise generated content? [image]

[image] JagWaugh: Is this just an empty forum with no posts in it, or have you imported or otherwise generated content? Yes, it’s basically empty. But there is also a Wordpress site running on the same droplet. But it’s also virtually empty and trafficless. I have a couple of plugins installed though.

With no content, and no users, even with plugins, I think it should be faster than you are reporting. What plugins? Are you page loads slow in /safe-mode too?

Is there any swap activity on the machine while you’re using the Discourse site?

Is 1GB RAM enough for both WordPress and Discourse?

Product Support Self-hosting

mpalmer (Matt Palmer) March 3, 2017, 1:06am 21

I doubt you’re the first person to find this out. You might be the first person to share their findings here, though.

Someone who doesn’t mind a slow site, and who doesn’t want to spend any more money than what it costs for a 1GB droplet, probably.

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