Name Rascal/Libraries/util/Benchmark/userTime

Synopsis User time in nanoseconds (10^-9 sec).

Function

1. int userTime()
2. int userTime(void () block)

Usage import util::Benchmark;

Description

1. Current time in nanoseconds (10^-9 sec) since the start of the thread that runs the code that calls this function.
2. User time in nanoseconds needed to execute the code block.

Examples We use the factorial function described in Recipes:Factorial as example:

rascal>import util::Benchmark;
ok
rascal>import demo::basic::Factorial;
ok

Here we measure time by using separate calls to userTime before and after a call to fac.

rascal>before = userTime();
int: 169265836000
rascal>fac(50);
int: 30414093201713378043612608166064768844377641568960512000000000000
rascal>userTime() - before;
int: 8934000

The code to be measured can also be passed as a function parameter to userTime:

rascal>userTime( void() { fac(50); } );
int: 686000

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