cputests | wasm/javascript/java/C tests
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QUESTION
I am trying to read JSON elements "unit" and "value" using PHP. However, some JSON elements ("local/sysbench-cpu-1.0.0", "m4.4xlarge-4.4.0-66-generic") may not be the same in each JSON. That is why I want to use regex or the array index to access elements rather then a particular string:
...ANSWER
Answered 2017-Mar-28 at 23:51PHP's JSON parsing only returns a plain old associative array, or an object. Neither of these support using regexes as lookups. If you insist on using native PHP, you'll have to foreach
your way through the keys and values.
Or, you might take a look at something like JsonPath which allows you to load up JSON, and then use a query string that looks very close to shell globbing:
QUESTION
I've been a programmer for a long time and have recently gotten a job writing C#. I was curious to see if Visual Studio optimized property calls to simple memory moves instead of performing a function call and return. So I wrote a program that had two versions of a 3D point class with a method to compute the magnitude: one version accesses the fields directly and one uses properties. I ran both with 100,000,000 points and they took the same amount of time. But when I use ildasm to look at the generated code, the version using properties seems to use a function call to access the property value. (This is a Release build, so code optimization is turned on.)
My questions:
Is the function call to get_X being optimized to a memory move at runtime? (It would seem so since it takes the same amount of time to execute as direct field references.)
Is there a way, using ildasm or another tool, to see which optimizations occur at runtime?
I have tried running the process without the debugger then attaching to the process but VS2017 says "No disassembly available".
The version that calls private fields directly:
...ANSWER
Answered 2017-Mar-20 at 21:06In his book, CLR via C#, Jeffrey Richter writes:
For simple get and set accessor methods, the just-in-time (JIT) compiler inlines the code so that there’s no run-time performance hit as a result of using properties rather than fields.
CLR via C# is kind of my bible, so for me, this is more than enough proof that they are inlined.
ildasm can only show you the end result of the optimizations that happen at compile time. If you want to check the runtime optimizations, you have to actually look at the runtime code, that is, the code that is generated from the assembly and is being run. S.O.S extension for WinDbg might be a tool that can help you.
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