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Links for 2015-05-12

  • Input: Fonts for Code

    Non-monospaced coding fonts! I’m all in favour…

    As writing and managing code becomes more complex, today’s sophisticated coding environments are evolving to include everything from breakpoint markers to code folding and syntax highlighting. The typography of code should evolve as well, to explore possibilities beyond one font style, one size, and one character width.

    (tags: input fonts via:its typography code coding font text ide monospace)

  • Apache HTrace

    a Zipkin-compatible distributed-system tracing framework in Java, in the Apache Incubator

    (tags: zipkin tracing trace apache incubator java debugging)

  • Intel speeds up etcd throughput using ADR Xeon-only hardware feature

    To reduce the latency impact of storing to disk, Weaver’s team looked to buffering as a means to absorb the writes and sync them to disk periodically, rather than for each entry. Tradeoffs? They knew memory buffers would help, but there would be potential difficulties with smaller clusters if they violated the stable storage requirement. Instead, they turned to Intel’s silicon architects about features available in the Xeon line. After describing the core problem, they found out this had been solved in other areas with ADR. After some work to prove out a Linux OS supported use for this, they were confident they had a best-of-both-worlds angle. And it worked. As Weaver detailed in his CoreOS Fest discussion, the response time proved stable. ADR can grab a section of memory, persist it to disk and power it back. It can return entries back to disk and restore back to the buffer. ADR provides the ability to make small (<100MB) segments of memory “stable” enough for Raft log entries. It means it does not need battery-backed memory. It can be orchestrated using Linux or Windows OS libraries. ADR allows the capability to define target memory and determine where to recover. It can also be exposed directly into libs for runtimes like Golang. And it uses silicon features that are accessible on current Intel servers.

    (tags: kubernetes coreos adr performance intel raft etcd hardware linux persistence disk storage xeon)