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  </channel><item rdf:about="https://tech.redplanetlabs.com/2020/09/02/clojure-faster/">
    <title>Clojure, Faster – Tech blog</title>
    <dc:date>2021-01-08T22:14:58+00:00</dc:date>
    <link>https://tech.redplanetlabs.com/2020/09/02/clojure-faster/</link>
    <dc:creator>nico.ash</dc:creator><description><![CDATA[Dynamic, functional programming languages like Clojure are sometimes considered “slower” than their statically-typed and/or OO counterparts, due to facilities like dynamic function dispatch and immutable-orientation, etc. But this comparison is too general.

Clojure is readily optimizable in cases where utmost performance is key. Clojure embraces the “Get it working, then make it fast” approach to building up a software system—even large-scale systems with high performance demands¹.

This post is about micro-optimizing Clojure code: how can we improve our Clojure code performance on the JVM when we need it the most, when hot code paths and tight loops prevail—for example, in large-scale data processing systems.

General JVM performance, benchmarking, and tuning is a broad and deep skillset and there are many more considerations beyond Clojure. The focus here is Clojure-specific.]]></description>
<dc:subject>clojure optimisation performance profiling</dc:subject>
<dc:source>https://pinboard.in/</dc:source>
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<item rdf:about="https://vladmihalcea.com/books/high-performance-java-persistence/#testimonials">
    <title>High-Performance Java Persistence - Vlad Mihalcea</title>
    <dc:date>2020-07-17T09:42:55+00:00</dc:date>
    <link>https://vladmihalcea.com/books/high-performance-java-persistence/#testimonials</link>
    <dc:creator>nico.ash</dc:creator><dc:subject>java jpa database performance</dc:subject>
<dc:source>https://pinboard.in/</dc:source>
<dc:identifier>https://pinboard.in/u:nico.ash/b:efd5ac4f817d/</dc:identifier>
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<item rdf:about="https://jan.rychter.com/enblog/cloud-server-cpu-performance-comparison-2019-12-12">
    <title>Cloud server CPU performance comparison</title>
    <dc:date>2020-07-09T07:02:22+00:00</dc:date>
    <link>https://jan.rychter.com/enblog/cloud-server-cpu-performance-comparison-2019-12-12</link>
    <dc:creator>nico.ash</dc:creator><description><![CDATA[Alternate titles: "The cloud makes no sense", "Intel Xeon processors are slow", "The Great vCPU Heist".

I recently decided to try to move some of my CPU-intensive workload from my desktop into the "cloud". After all, that's supposedly what those big, strong and fast cloud servers are for.

I found that choosing a cloud provider is not obvious at all, even if you only want to consider raw CPU speed. Operators do not post benchmarks, only vague claims about "fastest CPUs". So I decided to do my own benchmarking and compiled them into a very unscientific, and yet revealing comparison.

I was aiming for the fastest CPUs. Most of my needs are for interactive development and quick builds, in terms of wall clock performance. Which means CPU performance matters a lot. Luckily, that's what all cloud providers advertise, right?

I decided to write up my experiences because I wish I could have read about all this instead of doing the work myself. I hope this will be useful to other people.]]></description>
<dc:subject>aws linode vps hosting cloud cloudcomputing performance</dc:subject>
<dc:source>https://pinboard.in/</dc:source>
<dc:identifier>https://pinboard.in/u:nico.ash/b:685d41aad91f/</dc:identifier>
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<item rdf:about="https://news.ycombinator.com/item?id=23616878">
    <title>Show HN: Query 1.6B rows in milliseconds, live | Hacker News</title>
    <dc:date>2020-07-06T10:26:32+00:00</dc:date>
    <link>https://news.ycombinator.com/item?id=23616878</link>
    <dc:creator>nico.ash</dc:creator><description><![CDATA[Author here.

A few weeks ago, we wrote about how we implemented SIMD instructions to aggregate a billion rows in milliseconds [1] thanks in great part to Agner Fog’s VCL library [2]. Although the initial scope was limited to table-wide aggregates into a unique scalar value, this was a first step towards very promising results on more complex aggregations. With the latest release of QuestDB, we are extending this level of performance to key-based aggregations.

To do this, we implemented Google’s fast hash table aka “Swisstable” [3] which can be found in the Abseil library [4]. In all modesty, we also found room to slightly accelerate it for our use case. Our version of Swisstable is dubbed “rosti”, after the traditional Swiss dish [5]. There were also a number of improvements thanks to techniques suggested by the community such as prefetch (which interestingly turned out to have no effect in the map code itself) [6]. Besides C++, we used our very own queue system written in Java to parallelise the execution [7].

The results are remarkable: millisecond latency on keyed aggregations that span over billions of rows.

We thought it could be a good occasion to show our progress by making this latest release available to try online with a pre-loaded dataset. It runs on an AWS instance using 23 threads. The data is stored on disk and includes a 1.6billion row NYC taxi dataset, 10 years of weather data with around 30-minute resolution and weekly gas prices over the last decade. The instance is located in London, so folks outside of Europe may experience different network latencies. The server-side time is reported as “Execute”.

We provide sample queries to get started, but you are encouraged to modify them. However, please be aware that not every type of query is fast yet. Some are still running under an old single-threaded model. If you find one of these, you’ll know: it will take minutes instead of milliseconds. But bear with us, this is just a matter of time before we make these instantaneous as well. Next in our crosshairs is time-bucket aggregations using the SAMPLE BY clause.

If you are interested in checking out how we did this, our code is available open-source [8]. We look forward to receiving your feedback on our work so far. Even better, we would love to hear more ideas to further improve performance. Even after decades in high performance computing, we are still learning something new every day.]]></description>
<dc:subject>database query performance</dc:subject>
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<dc:identifier>https://pinboard.in/u:nico.ash/b:e7094a1177bc/</dc:identifier>
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<item rdf:about="https://github.com/snabbco/snabb">
    <title>snabbco/snabb: Snabb: Simple and fast packet networking</title>
    <dc:date>2020-06-10T09:13:26+00:00</dc:date>
    <link>https://github.com/snabbco/snabb</link>
    <dc:creator>nico.ash</dc:creator><description><![CDATA[Snabb is written using these main techniques:

    Lua, a high-level programming language that is easy to learn.
    LuaJIT, a just-in-time compiler that is competitive with C.
    Ethernet I/O with no kernel overhead ("kernel bypass" mode).

Snabb compiles into a stand-alone executable called snabb. This single binary includes multiple applications and runs on any modern Linux/x86-64 distribution. (You could think of it as a busybox for networking.)
How is it being used?

The first generation of Snabb applications include:
snabbnfv

Snabb NFV makes QEMU/KVM networking performance practical for applications that require high packet rates, such as ISP core routers. This is intended for people who want to process up to 100 Gbps or 50 Mpps of Virtio-net network traffic per server. We originally developed Snabb NFV to support Deutsche Telekom's TeraStream network.

You can deploy Snabb NFV stand-alone with QEMU or you can integrate it with a cloud computing platform such as OpenStack.]]></description>
<dc:subject>lua networking performance tool</dc:subject>
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</item>
<item rdf:about="https://martinheinz.dev/blog/13">
    <title>Martin Heinz - Personal Website &amp; Blog</title>
    <dc:date>2020-01-14T07:08:53+00:00</dc:date>
    <link>https://martinheinz.dev/blog/13</link>
    <dc:creator>nico.ash</dc:creator><dc:subject>performance programming python</dc:subject>
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<item rdf:about="https://blog.expensify.com/2018/01/08/scaling-sqlite-to-4m-qps-on-a-single-server/">
    <title>Scaling SQLite to 4M QPS on a Single Server (EC2 vs Bare Metal) « Expensify Blog</title>
    <dc:date>2019-11-27T18:31:34+00:00</dc:date>
    <link>https://blog.expensify.com/2018/01/08/scaling-sqlite-to-4m-qps-on-a-single-server/</link>
    <dc:creator>nico.ash</dc:creator><dc:subject>database performance sqlite</dc:subject>
<dc:identifier>https://pinboard.in/u:nico.ash/b:2cb7bc0e62e1/</dc:identifier>
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</item>
<item rdf:about="https://clemenswinter.com/2018/07/09/how-to-analyze-billions-of-records-per-second-on-a-single-desktop-pc/2/">
    <title>How to Analyze Billions of Records per Second on a Single Desktop PC | Clemens' Blog | Page 2</title>
    <dc:date>2019-11-13T06:38:25+00:00</dc:date>
    <link>https://clemenswinter.com/2018/07/09/how-to-analyze-billions-of-records-per-second-on-a-single-desktop-pc/2/</link>
    <dc:creator>nico.ash</dc:creator><description><![CDATA[Lies, damned lies and benchmarks

This section evaluates LocustDB on benchmarks based on a series of blog posts by Mark Litwintschik.

Analyses > 1billion taxi trips in new york.]]></description>
<dc:subject>performance database analytics</dc:subject>
<dc:identifier>https://pinboard.in/u:nico.ash/b:358720e25118/</dc:identifier>
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	<rdf:li rdf:resource="https://pinboard.in/u:nico.ash/t:database"/>
	<rdf:li rdf:resource="https://pinboard.in/u:nico.ash/t:analytics"/>
</rdf:Bag></taxo:topics>
</item>
<item rdf:about="http://www.craigkerstiens.com/2013/01/10/more-on-postgres-performance/">
    <title>More on Postgres Performance - Craig Kerstiens</title>
    <dc:date>2019-10-10T05:28:12+00:00</dc:date>
    <link>http://www.craigkerstiens.com/2013/01/10/more-on-postgres-performance/</link>
    <dc:creator>nico.ash</dc:creator><dc:subject>sql postgresql performance</dc:subject>
<dc:identifier>https://pinboard.in/u:nico.ash/b:bd23a7457f34/</dc:identifier>
<taxo:topics><rdf:Bag>	<rdf:li rdf:resource="https://pinboard.in/u:nico.ash/t:sql"/>
	<rdf:li rdf:resource="https://pinboard.in/u:nico.ash/t:postgresql"/>
	<rdf:li rdf:resource="https://pinboard.in/u:nico.ash/t:performance"/>
</rdf:Bag></taxo:topics>
</item>
<item rdf:about="https://github.com/redplanetlabs/specter">
    <title>GitHub - redplanetlabs/specter: Clojure(Script)'s missing piece</title>
    <dc:date>2019-09-20T11:58:00+00:00</dc:date>
    <link>https://github.com/redplanetlabs/specter</link>
    <dc:creator>nico.ash</dc:creator><description><![CDATA[Specter rejects Clojure's restrictive approach to immutable data structure manipulation, instead exposing an elegant API to allow any sort of manipulation imaginable. Specter especially excels at querying and transforming nested and recursive data, important use cases that are very complex to handle with vanilla Clojure.]]></description>
<dc:subject>clojure performance</dc:subject>
<dc:identifier>https://pinboard.in/u:nico.ash/b:5342d7bf9853/</dc:identifier>
<taxo:topics><rdf:Bag>	<rdf:li rdf:resource="https://pinboard.in/u:nico.ash/t:clojure"/>
	<rdf:li rdf:resource="https://pinboard.in/u:nico.ash/t:performance"/>
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<item rdf:about="https://pgdash.io/blog/scaling-postgres.html">
    <title>Vertically Scaling PostgreSQL - pgDash</title>
    <dc:date>2019-09-13T22:25:19+00:00</dc:date>
    <link>https://pgdash.io/blog/scaling-postgres.html</link>
    <dc:creator>nico.ash</dc:creator><description><![CDATA[PostgreSQL can scale rather well vertically. The more resources (CPU, memory, disk) that you can make available to your PostgreSQL server, the better it can perform. However, while some parts of Postgres can automatically make use of the increased resources, other parts need configuration changes before improvements can be noticed.

Read on to learn more about how to ensure PostgreSQL makes full use of the system you’re running it on.

]]></description>
<dc:subject>postgresql performance</dc:subject>
<dc:identifier>https://pinboard.in/u:nico.ash/b:302acbbfb667/</dc:identifier>
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	<rdf:li rdf:resource="https://pinboard.in/u:nico.ash/t:performance"/>
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</item>
<item rdf:about="http://www.helenanderson.co.nz/sql-query-tweaks/">
    <title>10 Ways to Tweak Slow SQL Queries | Helen Anderson</title>
    <dc:date>2019-09-02T19:23:01+00:00</dc:date>
    <link>http://www.helenanderson.co.nz/sql-query-tweaks/</link>
    <dc:creator>nico.ash</dc:creator><description><![CDATA[A few tweaks could be all you need to get things working.]]></description>
<dc:subject>Sql db postgresql performance</dc:subject>
<dc:identifier>https://pinboard.in/u:nico.ash/b:3093f56dcd0d/</dc:identifier>
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<item rdf:about="http://cory.li/bytecode-hacking/">
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<item rdf:about="https://dalibo.github.io/powa/">
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<item rdf:about="http://www.huyng.com/posts/python-performance-analysis/">
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<item rdf:about="http://sealedabstract.com/rants/why-mobile-web-apps-are-slow/">
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<item rdf:about="http://www.raywenderlich.com/31166/25-ios-app-performance-tips-tricks">
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<item rdf:about="http://www.askthepony.com/blog/2011/07/getting-django-on-heroku-prancing-8-times-faster/">
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<item rdf:about="http://www.youtube.com/watch?v=pBF3dKrVhxQ&amp;list=PLC76ACB3B5EC1FC62">
    <title>Techniques for improving Python performance - YouTube</title>
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<item rdf:about="http://kotek.net/blog/3G_map">
    <title>kotek.net - 3G map</title>
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<item rdf:about="http://applidium.com/en/news/free_those_pins/">
    <title>Applidium — Free those pins!</title>
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<item rdf:about="http://blog.explainmydata.com/2012/07/expensive-lessons-in-python-performance.html">
    <title>data data everywhere: Expensive lessons in Python performance tuning</title>
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<item rdf:about="http://marakana.com/s/tuning_jvm_for_a_vm_lessons_learned_directly_from_vmware_video,1138/index.html">
    <title>Tuning JVM for a VM - Lessons Learned, Directly from VMware - Marakana</title>
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<item rdf:about="http://dtrace.org/blogs/brendan/2012/03/26/subsecond-offset-heat-maps/">
    <title>Brendan's blog » Subsecond Offset Heat Maps</title>
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<item rdf:about="http://www.cocoanetics.com/2011/10/avoiding-image-decompression-sickness/">
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<item rdf:about="http://dtrace.org/blogs/brendan/2011/10/10/top-10-dtrace-scripts-for-mac-os-x/">
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    <title>Mailinator(tm) Blog: How Mailinator compresses email by 90%</title>
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<item rdf:about="http://www.python.org/doc/essays/list2str.html">
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<dc:source>https://apple.com/iphone/</dc:source>
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<item rdf:about="http://www.vrplumber.com/programming/runsnakerun/">
    <title>RunSnakeRun Python (c)Profile Viewer</title>
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    <link>http://www.vrplumber.com/programming/runsnakerun/</link>
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<item rdf:about="http://httparchive.org/">
    <title>HTTP Archive</title>
    <dc:date>2011-06-25T07:43:01+00:00</dc:date>
    <link>http://httparchive.org/</link>
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<item rdf:about="http://www.mnot.net/blog/2011/05/18/http_benchmark_rules">
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<item rdf:about="http://yostudios.github.com/Spritemapper/">
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<item rdf:about="http://pinboard.in/blog/173/">
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    <link>http://pinboard.in/blog/173/</link>
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<item rdf:about="http://newrelic.com/">
    <title>Web Application Monitoring and Management .:. New Relic</title>
    <dc:date>2011-01-09T10:10:18+00:00</dc:date>
    <link>http://newrelic.com/</link>
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<item rdf:about="http://www.dragthing.com/blog/2009/07/how-to-make-your-iphone-app-launch-faster/">
    <title>How To Make Your iPhone App Launch Faster « Three Letter Acronym</title>
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    <link>http://www.dragthing.com/blog/2009/07/how-to-make-your-iphone-app-launch-faster/</link>
    <dc:creator>nico.ash</dc:creator><dc:subject>ios launch performance iphonedev</dc:subject>
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<item rdf:about="http://stackoverflow.com/questions/72394/what-should-a-developer-know-before-building-a-public-web-site">
    <title>What should a developer know before building a public web site? - Stack Overflow</title>
    <dc:date>2010-11-24T18:56:36+00:00</dc:date>
    <link>http://stackoverflow.com/questions/72394/what-should-a-developer-know-before-building-a-public-web-site</link>
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<item rdf:about="http://code.google.com/p/asynctools/">
    <title>asynctools - Project Hosting on Google Code</title>
    <dc:date>2010-11-22T17:08:46+00:00</dc:date>
    <link>http://code.google.com/p/asynctools/</link>
    <dc:creator>nico.ash</dc:creator><description><![CDATA[asynctools is a library allowing you to execute Google App Engine API calls in parallel. API calls can be mixed together and queued up and then all are kicked off in parallel. Callbacks can be used to operate over completed calls immediately, if desired.

Currently, wrappers for Query and UrlFetch API calls are available. More will come over time.
]]></description>
<dc:subject>api app appengine async asynchronous code database dev gae google library python performance parallel opensource running software tools asynctools datastore engine queries query</dc:subject>
<dc:identifier>https://pinboard.in/u:nico.ash/b:33848008217b/</dc:identifier>
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	<rdf:li rdf:resource="https://pinboard.in/u:nico.ash/t:appengine"/>
	<rdf:li rdf:resource="https://pinboard.in/u:nico.ash/t:async"/>
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<item rdf:about="http://www.cyberciti.biz/tips/top-linux-monitoring-tools.html">
    <title>20 Linux System Monitoring Tools Every SysAdmin Should Know</title>
    <dc:date>2010-11-16T21:40:02+00:00</dc:date>
    <link>http://www.cyberciti.biz/tips/top-linux-monitoring-tools.html</link>
    <dc:creator>nico.ash</dc:creator><dc:subject>linux sysadmin monitoring tools performance network monitor resources</dc:subject>
<dc:identifier>https://pinboard.in/u:nico.ash/b:863c0939cc4e/</dc:identifier>
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<item rdf:about="http://yoshinorimatsunobu.blogspot.com/2010/10/using-mysql-as-nosql-story-for.html">
    <title>Yoshinori Matsunobu's blog: Using MySQL as a NoSQL - A story for exceeding 750,000 qps on a commodity server</title>
    <dc:date>2010-11-09T20:50:26+00:00</dc:date>
    <link>http://yoshinorimatsunobu.blogspot.com/2010/10/using-mysql-as-nosql-story-for.html</link>
    <dc:creator>nico.ash</dc:creator><dc:subject>mysql nosql performance database scalability scaling benchmark optimization memcached</dc:subject>
<dc:identifier>https://pinboard.in/u:nico.ash/b:860075716f9d/</dc:identifier>
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<item rdf:about="http://tibleiz.net/asm-xml/index.html">
    <title>AsmXml - A Fast XML Parser</title>
    <dc:date>2010-10-08T13:53:27+00:00</dc:date>
    <link>http://tibleiz.net/asm-xml/index.html</link>
    <dc:creator>nico.ash</dc:creator><description><![CDATA[AsmXml is a very fast XML parser and decoder for x86 platforms (Windows, Linux, BSD and Mac OS X). It achieves high speed by using the following features:

    * Written in pure assembler
    * Optimized memory access
    * More than a parser: parsing and decoding at the same time (decoding means that attributes and elements are accessible in O(1) time) 

To give an idea of the relative speed of AsmXml, the fastest open source XML parsers process between 10 and 30 MBs of XML per seconds while AsmXml processes around 200 MBs per seconds (on an Athlon XP 1800+).
]]></description>
<dc:subject>xml parser programming library speed performance scalability assembly asm</dc:subject>
<dc:identifier>https://pinboard.in/u:nico.ash/b:b735d1fea822/</dc:identifier>
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	<rdf:li rdf:resource="https://pinboard.in/u:nico.ash/t:programming"/>
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</item>
<item rdf:about="http://blog.urbanairship.com/blog/2010/09/29/linux-kernel-tuning-for-c500k/">
    <title>Linux Kernel Tuning for C500k | Urban Airship Blog</title>
    <dc:date>2010-10-01T13:05:30+00:00</dc:date>
    <link>http://blog.urbanairship.com/blog/2010/09/29/linux-kernel-tuning-for-c500k/</link>
    <dc:creator>nico.ash</dc:creator><description><![CDATA[At Urban Airship we recently published a blog post  about scaling beyond 500,000 concurrent socket connections. Hitting these numbers was not a trivial exercise so we’re going to share what we’ve come across during our testing. This guide is specific to Linux and has some information related to Amazon EC2, but it is not EC2-centric. These principles should apply to just about any Linux platform.
]]></description>
<dc:subject>linux kernel performance scalability sysadmin networking tuning c500k memory c10k</dc:subject>
<dc:identifier>https://pinboard.in/u:nico.ash/b:3c880b20de36/</dc:identifier>
<taxo:topics><rdf:Bag>	<rdf:li rdf:resource="https://pinboard.in/u:nico.ash/t:linux"/>
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	<rdf:li rdf:resource="https://pinboard.in/u:nico.ash/t:memory"/>
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</item>
<item rdf:about="http://www.ibm.com/developerworks/java/library/j-benchmark1.html">
    <title>Robust Java benchmarking, Part 1: Issues</title>
    <dc:date>2010-09-30T10:38:29+00:00</dc:date>
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<item rdf:about="http://encosia.com/2008/12/10/3-reasons-why-you-should-let-google-host-jquery-for-you/">
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<item rdf:about="http://hacks.bluesmoon.info/boomerang/doc/">
    <title>this, is boomerang</title>
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<item rdf:about="http://mongrel2.org/index">
    <title>mongrel2: mongrel2</title>
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    <link>http://mongrel2.org/index</link>
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<item rdf:about="http://olegkikin.com/performance/">
    <title>Visualizing performance from the server logs</title>
    <dc:date>2010-06-21T13:17:58+00:00</dc:date>
    <link>http://olegkikin.com/performance/</link>
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<item rdf:about="http://almirkaric.com/2010/6/14/automated-scalability/">
    <title>Automated scalability</title>
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    <link>http://almirkaric.com/2010/6/14/automated-scalability/</link>
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<item rdf:about="http://mir.aculo.us/2010/06/04/making-an-ipad-html5-app-making-it-really-fast/">
    <title>mir.aculo.us with Thomas Fuchs » Blog Archive » Making an iPad HTML5 App &amp; making it really fast</title>
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<item rdf:about="http://sheddingbikes.com/posts/1273859940.html">
    <title>Shedding Bikes: Programming Culture And Philosophy</title>
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    <dc:creator>nico.ash</dc:creator><description><![CDATA[Announcing NoNoSQL
]]></description>
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<item rdf:about="http://blogs.nullvision.com/?p=275">
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<item rdf:about="http://neil.fraser.name/news/2010/04/07/">
    <title>Neil Fraser: News: Deferred Analytics</title>
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<item rdf:about="http://www.jonathansaggau.com/blog/2009/01/iphone_responsiveness_and_memo.html">
    <title>Jonathan Saggau's Blog: iPhone responsiveness and memory usage</title>
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<item rdf:about="http://chadaustin.me/2010/03/your-version-control-and-build-systems-dont-scale-introducing-ibb/">
    <title>Your Version Control and Build Systems Don’t Scale | Chad Austin</title>
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    <dc:creator>nico.ash</dc:creator><description><![CDATA[a very fast i/o bound build system
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<item rdf:about="http://project-voldemort.com/">
    <title>Project Voldemort</title>
    <dc:date>2010-03-03T17:54:27+00:00</dc:date>
    <link>http://project-voldemort.com/</link>
    <dc:creator>nico.ash</dc:creator><dc:subject>database distributed storage scalability java opensource programming performance</dc:subject>
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<item rdf:about="http://www.supermegaultragroovy.com/blog/2009/11/12/swimming-in-opencl/">
    <title>SuperMegaUltraGroovy » Blog Archive » Swimming in OpenCL</title>
    <dc:date>2010-02-24T15:40:11+00:00</dc:date>
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    <dc:creator>nico.ash</dc:creator><description><![CDATA[dividing by 8 processing time using opencl
]]></description>
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<item rdf:about="http://makeitrank.com/10-htaccess-hacks-every-seo-should-know">
    <title>10 htaccess Hacks Every SEO Should Know |</title>
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