Arnoldc[ edit ] Arnoldc is an esoteric programming language based on one-liners of Arnold Schwarzenegger.
Resources Key sections to start with are: Hopefully this is useful so far. Screenshot Starting with a screenshot, here's perf version 3. Options included -a to trace all CPUs, and -g to capture call graphs stack traces.
Trace data is written to a perf. A summary of the perf. Use sudo as needed. One-Liners Some useful one-liners I've gathered or written. Terminology I'm using, from lowest to highest overhead: A video of the talk is on youtube and the slides are on slideshare: There's also an older version of this talk fromwhich I've posted about.
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I'll describe the prerequisites, audience, usage, events, and tracepoints. Prerequisites The perf tool is in the linux-tools-common package.
It may tell you to install another related package linux-tools-kernelversion. You can also build and add perf from the Linux kernel source. See the Building section.
To get the most out perf, you'll want symbols and stack traces. These may work by default in your Linux distribution, or they may require the addition of packages, or recompilation of the kernel with additional config options.
These are used to translate memory addresses into function and variable names, so that they can be read by us humans. Without symbols, you'll see hexadecimal numbers representing the memory addresses profiled.
The following perf report output shows stack traces, however, only hexadecimal numbers can be seen: Sometimes perf report will tell you to install these, eg: Here's the same perf report output seen earlier, after adding openssh-server-dbgsym and libc6-dbgsym this is on ubuntu Another way to get symbols is to compile the software yourself.
For example, I just compiled node Node. If the result is stripped, configure your build system not to run strip 1 on the output binaries. Eg, you won't see Java classes and methods.
Java can do this with perf-map-agentand Node. See my blog post Node. Note that Java may not show full stacks to begin with, due to hotspot on x86 omitting the frame pointer just like gcc. See my Netflix Tech Blog post, Java in Flamesfor a full writeup, and my Java flame graphs section, which links to an older patch and includes an example resulting flame graph.
Omitting frame pointers is an evil compiler optimization that breaks debuggers, and sadly, is often the default. There are three ways to fix this: I'll add docs for them at some point and as perf support arrives.
Frame Pointers The earlier sshd example was a default build of OpenSSH, which uses compiler optimizations -O2which in this case has omitted the frame pointer. Here's how it looks after recompiling OpenSSH with -fno-omit-frame-pointer: The kernel can suffer the same problem.
Here's an example CPU profile collected on an idle server, with stack traces -g: Dwarf Since about the 3. This can be enabled using "--call-graph dwarf" or "-g dwarf". It is disabled in most cloud environments, where you'll get this error:Famous One-Liners. There are literally thousands of popular one liners in English (and also in other languages).
A hand-picked collection of thoughtful one liners, keen and winged words of wisdom (as an inspiration) for speeches, letters, greeting cards, weddings, birthdays, and goodbye / farewell.
No Edinburgh Fringe is complete without a compilation of the best jokes, witticisms and one-liners harvested from the slew of comedy acts who make their way to the city each summer.
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An esoteric programming language (sometimes shortened to esolang) is a programming language designed to test the boundaries of computer programming language design, as a proof of concept, as software art, as a hacking interface to another language (particularly functional programming or procedural programming languages), or as a joke.
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