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!
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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.
𝒢𝑅𝐸𝒜𝒯 𝒫𝒪𝒮𝒯! 𝐼 𝒟𝒪 𝐿𝐼𝒩𝒦 𝐵𝒰𝐼𝐿𝒟𝐼𝒩𝒢 𝐹𝒪𝑅 𝑀𝒴 𝐵𝒰𝒮𝐼𝒩𝐸𝒮𝒮 𝒫𝑅𝒪𝑀𝒪𝒯𝐼𝒪𝒩 𝒮𝒪 𝒯𝐻𝐼𝒮 𝒫𝒪𝒮𝒯 𝒱𝐸𝑅𝒴 𝒰𝒮𝐸𝐹𝒰𝐿 𝐹𝒪𝑅 𝑀𝐸, 𝐵𝐿𝒪𝒢 𝒞𝒪𝑀𝑀𝐸𝒩𝒯𝐼𝒩𝒢 𝐼𝒮 𝒜 𝒢𝑅𝐸𝒜𝒯 𝒮𝒦𝐼𝐿𝐿 𝒯𝐻𝒜𝒯 𝒟𝐸𝒫𝐸𝒩𝒟𝒮 𝒪𝒩 𝒜 𝒞𝒪𝒰𝒫𝐿𝐸 𝒪𝐹 𝐹𝒜𝒞𝒯𝒪𝑅𝒮 𝒯𝐻𝒜𝒯 𝒜𝑅𝐸 𝒱𝐸𝑅𝒴 𝒲𝐸𝐿𝐿 𝐸𝒳𝒫𝐿𝒜𝐼𝒩𝐸𝒟.
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G͆R͆E͆A͆T͆ P͆O͆S͆T͆! I͆ D͆O͆ L͆I͆N͆K͆ B͆U͆I͆L͆D͆I͆N͆G͆ F͆O͆R͆ M͆Y͆ B͆U͆S͆I͆N͆E͆S͆S͆ P͆R͆O͆M͆O͆T͆I͆O͆N͆ S͆O͆ T͆H͆I͆S͆ P͆O͆S͆T͆ V͆E͆R͆Y͆ U͆S͆E͆F͆U͆L͆ F͆O͆R͆ M͆E͆, B͆L͆O͆G͆ C͆O͆M͆M͆E͆N͆T͆I͆N͆G͆ I͆S͆ A͆ G͆R͆E͆A͆T͆ S͆K͆I͆L͆L͆ T͆H͆A͆T͆ D͆E͆P͆E͆N͆D͆S͆ O͆N͆ A͆ C͆O͆U͆P͆L͆E͆ O͆F͆ F͆A͆C͆T͆O͆R͆S͆ T͆H͆A͆T͆ A͆R͆E͆ V͆E͆R͆Y͆ W͆E͆L͆L͆ E͆X͆P͆L͆A͆I͆N͆E͆D͆.
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T͙H͙A͙N͙K͙ Y͙O͙U͙ F͙O͙R͙ S͙H͙A͙R͙I͙N͙G͙ T͙H͙E͙ B͙L͙O͙G͙ C͙O͙M͙M͙E͙N͙T͙I͙N͙G͙ S͙I͙T͙E͙S͙. T͙H͙E͙S͙E͙ W͙I͙L͙L͙ S͙U͙R͙E͙L͙Y͙ H͙E͙L͙P͙ O͙U͙R͙ W͙E͙B͙S͙I͙T͙E͙ T͙O͙ R͙A͙N͙K͙ O͙N͙ T͙H͙E͙ S͙E͙A͙R͙C͙H͙ E͙N͙G͙I͙N͙E͙S͙. K͙E͙E͙P͙ S͙H͙A͙R͙I͙N͙G͙.
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G͎R͎E͎A͎T͎ S͎I͎T͎E͎S͎ L͎I͎S͎T͎, T͎H͎A͎N͎K͎S͎ F͎O͎R͎ S͎H͎A͎R͎I͎N͎G͎ I͎ S͎U͎B͎M͎I͎T͎T͎E͎D͎ M͎Y͎ W͎E͎B͎S͎I͎T͎E͎ T͎O͎ A͎L͎L͎ T͎H͎E͎S͎E͎ S͎I͎T͎E͎S͎. I͎T͎’S͎ R͎E͎A͎L͎L͎Y͎ H͎E͎L͎P͎F͎U͎L͎ F͎O͎R͎ M͎E͎ T͎H͎A͎N͎K͎S͎ F͎O͎R͎ S͎H͎A͎R͎I͎N͎G͎ T͎H͎I͎S͎ B͎L͎O͎G͎ C͎O͎M͎M͎E͎N͎T͎I͎N͎G͎ S͎I͎T͎E͎S͎.
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The Singapore Prayer Time today's is sundown, or iftar, is 7:11 AM, and the time for dawn break, or the conclusion of Sehri, is 5:57 AM. You can read the Singapore Sehri and Iftar times for Fiqa Hanafi (sunni) and Fiqa Jafria in addition to the Singapore Prayer hours (shia).
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