Caches help reduce latency, scale read-heavy workloads, and save cost. They are literally everywhere. Caches run on your phone and in your browser. For example, CDNs and DNS are essentially geo-replicated caches. It’s thanks to many caches working behind the … Read more
Even though Web Cache Poisoning has been around for years, the increasing complexity in technology stacks constantly introduces unexpected behaviour which can be abused to achieve novel cache poisoning attacks. In this paper I will present the techniques I used … Read more
by Sailesh Mukil, Prudhviraj Karumanchi, Tharanga Gamaethige, Shashi Madappa EVCache is a distributed in-memory caching solution based on memcached. It is a Tier-0 system at Netflix with its footprint across ~18,000 servers holding ~14 petabytes of data, and still rapidly … Read more
AnandTech has a great analysis of IBM’s new z/Architecture mainframe processor Telum, the successor to z15 (so you could consider it the “z16” if you like) scheduled for 2022. The most noteworthy part of that article is Telum’s unusual approach … Read more
Open source The article requires some prerequisite knowledge about Linux kernel memory management subsystem. Recently, while investigating an OOM (out-of-memory) problem, Twitter engineers found that the slab cache was increasing consistently, but the page cache was decreasing consistently. A closer … Read more
Many people must have heard this quote (by Phil Karlton) many times: There are only two hard things in Computer Science: cache invalidation and naming thing. Two days ago, Nick Tierney mentioned it again in his post “Naming Things”. Since … Read more