To get started, let’s try to identify or eliminate your web host/server from the bad-performance equation using ‘dd’ commands to benchmark your storage, memory and CPU performance. ‘dd’ requires no downloads and can quickly alert you to any performance bottlenecks and indicate if there’s a need for additional benchmarks using more complex tools.Īre you hosted on a Cloud, VPS, or Dedicated server and struggle with performance issues? When raising these issues to your web host, do they always seem to blame everything on your so-called “heavy” website? If you are tired of being hung out to dry, let’s do something about it. This article was originally posted on article will highlight using the ‘dd’ Unix command for a quick benchmark of your Linux server or VPS. This article drew on information from a few sources in particular: brian d foy’s Benchmarking Perl talk notes and David Golden’s Adventures in Benchmarking post. If you require more in depth benchmarking consider using Devel::NYTProf.Compare code examples rather than time individual ones: the actual execution time of a block of code is usually not that important knowing which set of code is faster than the other however is useful as this will generally be a repeatable occurrence.Sanity check your results: if you’re not sure try comparing two code blocks with one obviously slower than the other to check that Benchmark is returning sensible results.Some sources recommend at least -5 seconds to avoid inaccurate benchmarks. This specifies the minimum number of CPU seconds to run. Use a negative number as the CPU seconds count for timethese or cmpthese.Try to use the minimum set of code required for the behavior required - this will increase the accuracy of the benchmark pertaining to operations being benchmarked.This benchmark shows that the equalsAssign code block was 4% faster than the shiftAssign code block. The results above are ordered from slowest to fastest (as seen by the rate/s measurement). Let’s compare the speed difference of two common Perl operations: array assignment using the shift built in function and direct array assignment using equals: Benchmark provides a timethese subroutine which continuously executes sets of Perl code for a number of CPU seconds and then prints out the results. Timing Perl Codeīenchmarks are most interesting when comparing performance of code - so we’re going to focus on methods that do that. Benchmark::Forking is a drop-in replacement for Benchmark and all of the following code examples will work with either module. If you are on a UNIX-like system then consider installing Benchmark::Forking as it can improve the accuracy of benchmarks. Perl’s Benchmark Moduleīenchmark comes installed in Perl core so if you have Perl installed you should already have Benchmark installed as well. Therefore benchmark comparisons are only meaningful when the benchmark environments are the same. For example if Perl was compiled with iThreads enabled, this increases the overhead of all Perl programs. For Perl code the current Perl version and the compile options that Perl was installed with can have significant affects on code performance. One thing to keep in mind with benchmarks is that they are affected by the environment: the operating system, hardware, software and current machine state can all affect the benchmark. Any aspect of the code performance can be benchmarked: speed, memory use and IO frequency are some common metrics. In programming a benchmark is a point-in-time measurement of the performance of a some code. This article discusses benchmarking in general and how to use the Benchmark module. Benchmarking Perl code speed is easy with the Benchmark module.
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