benchmarking

Is it possible to force an existing Java application to use no more than x cores?

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It’s called setting CPU affinity, and it’s an OS setting for processes, not specific to Java. On Linux: http://www.cyberciti.biz/tips/setting-processor-affinity-certain-task-or-process.html On Windows: http://www.addictivetips.com/windows-tips/how-to-set-processor-affinity-to-an-application-in-windows/ On Mac it doesn’t look like you can set it: https://superuser.com/questions/149312/how-to-set-processor-affinity-on-os-x

Create quick/reliable benchmark with java?

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In short: (Micro-)benchmarking is very complex, so use a tool like the Benchmarking framework http://www.ellipticgroup.com/misc/projectLibrary.zip – and still be skeptical about the results (“Put micro-trust in a micro-benchmark”, Dr. Cliff Click). In detail: There are a lot of factors that can strongly influence the results: The accuracy and precision of System.nanoTime: it is in the … Read more

How efficient can Meteor be while sharing a huge collection among many clients?

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The short answer is that only new data gets sent down the wire. Here’s how it works. There are three important parts of the Meteor server that manage subscriptions: the publish function, which defines the logic for what data the subscription provides; the Mongo driver, which watches the database for changes; and the merge box, … Read more

Why is json.loads an order of magnitude faster than ast.literal_eval?

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The two functions are parsing entirely different languages—JSON, and Python literal syntax.* As literal_eval says: The string or node provided may only consist of the following Python literal structures: strings, bytes, numbers, tuples, lists, dicts, sets, booleans, and None. JSON, by contrast, only handles double-quoted JavaScript string literals (not quite identical to Python’s**), JavaScript numbers … Read more

Benchmarking VBA Code

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The following code uses a windows function that is more accurate than Excel. It is taken from http://msdn.microsoft.com/en-us/library/aa730921.aspx#Office2007excelPerf_MakingWorkbooksCalculateFaster. The same page also contains some great tips on improving performance in Excel 2007. Private Declare Function getFrequency Lib “kernel32” _ Alias “QueryPerformanceFrequency” (cyFrequency As Currency) As Long Private Declare Function getTickCount Lib “kernel32” _ Alias “QueryPerformanceCounter” … Read more

Python Requests vs PyCurl Performance

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I wrote you a full benchmark, using a trivial Flask application backed by gUnicorn/meinheld + nginx (for performance and HTTPS), and seeing how long it takes to complete 10,000 requests. Tests are run in AWS on a pair of unloaded c4.large instances, and the server instance was not CPU-limited. TL;DR summary: if you’re doing a … Read more

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