Since my last post I have made important changes to how images (mostly thumbnails) are serve on myVidster. Stated in my last post I divided the image workload between the new image server and the master server. I really did not like this setup because the master server should not be wasting disk I/O on image hosting.
My first attempt was to setup the image server to handle the entire load. This solution would have work if I was running RAID on the server, but I was not. It only took a few minutes before the server's hard disk was overwhelm. When you run into the dreaded disk I/O bottleneck you have two options which are to upgrade your hardware (SSD or RAID) or memory caching.
If you have been keeping up with my blog, you will know that I try to use in memory caching whenever possible so I did some research and learn about using a reverse proxy for image caching. For the reverse proxy I decided to give Varnish Cache a try, which was recommended by a developer/friend.
Setting up Varnish has straight forward the only catch was that I needed to disable cookies (remove req.http.Cookie) so that the images were always cached. Technicality the image server is now a web application accelerator with the task of caching and serving images.
As for performance, currently I am getting a hit rate around 85% with 400-500 requests per second. CPU load hovering around 10% which gives the server lots of room for handling more traffic when needed. Overall I am very pleased with Varnish's caching performance and would recommend this solution to those who want to accelerate image serving and to reduce disk I/O.
For the curious here is a list of memory caching solutions that myVidster uses.
Alternative PHP Cache (APC) opcode caching for PHP
Memcached for user session caching
Take care everyone and keep collecting!
258 comments:
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Great insights into optimizing image servers! The detailed explanation of handling caching, scaling, and performance improvements is really helpful for developers. Looking forward to more such technical deep dives. Well done!Click Here
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It’s great to see how optimizing image serving can make a big difference in performance! Using Varnish Cache for reverse proxy and memory caching sounds like a smart move to reduce disk I/O and speed up requests. A hit rate of 85% with 400-500 requests per second is impressive! This setup not only improves efficiency but also keeps the server ready for scaling. Definitely a solid approach for anyone dealing with high-traffic image hosting! 🚀
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This post details significant improvements made to image (primarily thumbnail) serving on myVidster, moving away from a setup that split the workload between a new image server and the master server. liteblue usps
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Interesting update! Revisiting image server performance is important for improving loading speed, reliability, and overall user experience. It’s always great to see developers refining infrastructure and finding better ways to handle image delivery efficiently. Click here for more!
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