Review of: Poppen.D

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You have 2. And please, don't use "requests per minute", nobody with interest in scale uses this term. It's mostly "requests per second" and suddenly your numbers don't seem so big anymore because it's only one 60th.

He did not say one partition per user, he said partition by user id. That does not suggest anything about partition size.

It can be users or 1 million users per partition. It only tells you what key is used to decide in which partition a value is stored. Also that does not have anything to do with MySQL per se.

The what one you work on? Also partitions? Yea right.. Great post. I think it was interesting to read and see how you solved many of your issues.

Also nice tip regarding graphite. Hi Alvaro. You said you were using memcached to cache view components like user profile.

Can you explain more detail on how you invalidate these view cache? I understand that you wrote your own code to invalidate "data cache" when the data was changed.

But for a view cache, there are lots of data, any of the data change should invalidate this view cache. How do you do that?

My first feeling: too many PHP servers. I think that Symfony is too slow PHP framework for them in this case. I learned from my experience that Symfony eat a lot of CPU.

Thanks for the tips on Erlyvideo, we've looked into it too some months ago. We are not decided yet. We use a EC2 for video delivery, the other systems are hosted in our physical servers.

The servers are running SLES We "namespaces" the keys, so we can invalidate related set of keys at once.

But it depends on which part of the site. So is hard to explain all this here. We use old blade servers with 6G of Ram with 8 cores. Then regarding symfony or any PHP framework while they are not the fastest solutions than plain PHP code or more lightweight frameworks, speed is not the only thing that you consider when choosing a framework.

This means we can hire people with ease, that already know the technology that we use. Then what happens if we use a super fast custom framework and then the "hacker" that wrote it leaves the company?

Who will maintain his code? And then your suggestion about moving to another framework sounds nice in theory, but do you know how many months of development could take to port the site code to another framework?

We also have to pay for our developers salaries which most of the time is more expensive than one of this blade servers. So as I said in an answer before, companies do business decisions, not just choose this or that framework because is fast.

So please, don't blame the number of servers on symfony, because while yes is heavier than plain PHP code, is not the reason why we use so many.

If not then why do you use PHP? Alvaro, i'm in no way questioning your infrastructure since you know it better than anybody else here, especially some of those 'armchair system architects.

Thanks for you insights. I agree with you. Is not that you go and throw money at hardware, there should be an equilibrium.

We also try to improve our code when we can, i. We are working on a lightweight solution for SQL queries, which according to our benchmarks will reduce quite a lot of load from the site since we can remove the ORM that we use, which is quite heavy.

Our site is evolving and we are learning from our mistakes as everyone should do. Regarding the load average statement, I said that because for some commenters it look like we have 28 completely overloaded machines.

Besides that we have those machines in place because we are planning for future growth, by future we mean imminent if everything goes as planned.

About APC vs. We have to ponder more that. Sometime we discuss the same as what you just said. I have no experience related to that to give an opinion.

Also APC cache is not shared, we have to ponder if that is a problem too. We do cache several computations into APC too. Thanks for a great article!

I have one question about your nginx and memcached. You wrote that many requests doesn't even hit PHP, because Nginx gets the cached content from memcached - can you describe it a little bit more?

Do you cache HTML pages? Erlyvideo is developed very rapidly. Several months ago you could see previous generation of it, that couldn't do anything.

So, if you are interested, better to communicate via email. Alvaro, I think you should try Erlyvideo - it's wrotten in Erlang, and it develops very fast.

What I found most interesting is how they manage to sucessfully blend a little of the old with a little of the new.

No, they didn't manage to successfully blend old and new. It's nearly never really fast, also every few weeks extra slow for at least a few hours, often for weeks.

The current slow-period is on since about 6 weeks, and still no end in sight. The performance of poppen. Far away from being successful Notify me of follow-up comments via email.

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Toolbox Nginx All our site is served via Nginx. Memcached We use Memcached heavily. Graphite We use Graphite to collect real time information and statistics from the website.

Red5 Our site also serves video to the users. Tsung Tsung is a distributed benchmarking tool written in Erlang. Lessons Learned While Buzz Oriented Development is cool, look for tools with an important community behind them.

Documentation and a good community are invaluable when there are problems to solve, or when you need to incorporate people to your team.

CouchDB and RabbitMQ also have good support from their developers, with active mailing list where questions are answered in time. We learned a lot from symfony.

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We have 2 frontend Nginx servers delivering Then we have separate machines to serve the site images. There are One of the cool things that Nginx lets us do is to deliver many requests out of Memcached, without the need of hitting the PHP machines to get content that is already cached.

So for example, the users profiles are one of the most CPU intensive pages in the site. Once the profile has been requested we cache the whole content on Memcached.

Then the Nginx server will hit the Memcached and deliver the content from there. There are requests per minute delivered out of the Memcached.

We have 3 Nginx servers that are delivering the images from a local cache. The users upload their pictures to a central file server. A picture request will then hit one of the 3 Nginx servers.

If the picture is not in the local cache filesystem, the Nginx will download the picture from the central server, store in its local cache and serve it.

This lets us load balance the image distribution and alleviate the load in the main storage machine. We use PHP 5.

The 5. The code is written using the symfony 1. On one hand this means extra resource footprint, on the other hand it gives us speed of development and a well know framework that lets us integrate new developers to the team with ease.

Not everything is "Flowers and Roses" here. So while we have a lot of advantages provided by the framework, we had to tweak it a lot to get it up to the task of serving www.

Thanks to the fact that the framework is easy to customize and configure, we were able to cache most of the expensive calculations that were adding extra load to the servers in APC.

This machine is 4 years old. We are planning to replace it by a sharded cluster. We are still working on the design of this system, trying to have a low impact in our data access code.

We want to partition the data by user id, since most of the information on the site is centered on the user itself, like images, videos, messages, etc.

We have 3 machines working in a master-slave-slave configuration for the users' forum. Then there's a cluster of servers that runs as storage for the web site custom message system.

Currently it has more than million messages. We also have an NDB cluster composed by 4 machines for write intensive data, like the statistics of which user visited which other user's profile.

We try to avoid joins like the plague and cache as much as possible. The datastructure is heavily denormalized. For that we have created summary tables, to ease searching.

The problem we are seeing more and more are full table locks. We are moving to the XtraDB storage engine. We use Memcached heavily.

We have 45 GB of cache over 51 nodes. Most of the queries by primary key that we have to the users table are cached in Memcached and then delivered from there.

We have a system that lets automatically invalidate the cache every time one record of that table is modified.

With those databases we can update the cache with enough granularity to not need to invalidate it. Since mid we introduced RabbitMQ into our stack.

It's been a solution that was easy to deploy and integrate with our system. During the last month we have been moving more and more stuff to the queue, meaning that at the moment the 28 PHP frontend machines are publishing around We send logs, email notifications, system messages, image uploads, and much more to the queue.

This allows us to send messages to the queue in an asynchronous fashion. At the same time, all the messages that where hold in an array in memory are then sent to RabbitMQ.

In this way the user doesn't have to wait for this either. We have two machines dedicated to consume those messages, running at the moment 40 PHP processes in total to consume the jobs.

Each PHP process consumes jobs and then dies and respawns again. We do that to avoid any kind of garbage collection problems with PHP.

In the future we may increase the number of jobs consumed per session in order to improve the performance, since respawing a PHP process proved to be quite CPU intensive.

This system lets us improve the resource management. For example during peak time we can even have logins per minute.

This means that we will have concurrent updates to the users table, to store the user last login time. Because now we enqueue those queries, we can run each of them sequentially instead.

If we need more processing speed we can add more consumers to the queue, even joining machines to the cluster, without the need of modifying any configuration or deploying any new code.

To store the logs we run CouchDB in one machine. It proved to be useful to detect where the problem is. Before having CouchDB as a log aggregator, we had to login and tail -f in each of the PHP machines and from there try to find where the problem was.

Now we relay all the logs to the queue, and then a consumer inserts them into CouchDB. In this way we can check for problems at a centralized place.

We use Graphite to collect real time information and statistics from the website. The Graphite server is getting around update operations per minute.

This tool has proven to be really useful to see what's going on in the site. It's simple text protocol and the graphing capabilities make it easy to use and nearly plug and play to any system that we want to monitor.

One cool thing that we did with Graphite was monitoring two versions of the site running at the same time. Last January we deployed our code backed by a new version of the symfony framework.

This meant that we will probably encounter performance regressions. We were able to run one version of the site in half of the servers while the new version was running in the others.

Then in Graphite we created Unix load graphs for each half and then compared them live. Since we found that the Unix load of the new version was higher, we launched the XHProf profiler and compared both versions.

We have a separate server where we send the XHProf profiles and from there we aggregate them and analyze them to find where the problems are. Our site also serves video to the users.

We have two kinds of them. One are videos from the user profiles which are movies produced and uploaded by the users. Also we have a Video Chat to let our users interact and share their videos.

On mid we were streaming 17TB of video per month to our users. Tsung is a distributed benchmarking tool written in Erlang. We have a tool to record traffic to the main MySQL server and convert that traffic to Tsung benchmarking sessions.

Then we replayed back that traffic and hit the machines in our lab with thousands of concurrent users generated by Tsung.

The cool thing is that we could produce test scenarios that look closer to what's happening in the real production environment.

I'd like to thanks Alvaro Videla for this excellent write up. If you would like to share the architecture for your fablous system, please contact me and we'll get started.

Let's do the math. They have 28 PHP boxes with processes each. You need as many PHP processes as you need to be able to handle concurrent requests not per second.

That means either their scripts take 1 second to execute each or they have way to many processes. Either way something is broken.

Quote: This system lets us improve the resource management. No that does not mean you have concurrent updates. Most of the time a lot less.

Also note they have 50 memcached nodes. How many servers do they have to handle this moderate amount of load? It's insane. Conclusion: not impressive and I have not seen any new insights.

I question the efficience of their code a lot. Hi Alvaro, thanks for that interesting insight in your architecture. Can you provide a link to Graphite?

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