How to measure and capture a script’s execution time in DolphinDB?

Polly 0
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I’d like to measure and capture my script’s execution time and assign it to an variable. I tried to assign the return of function timer to variable a, but it raised an exception of “invalid expression”.

a = timer x=1

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dolphindb execution-time time
1 Answers

The exception is raised because timer is not a function but a procedure. It only prints a message that cannot be assigned to a variable. However, you can use function evalTimer, which returns a scalar that can be assigned to a variable.

To use function evalTimer, you can rewrite the statement block as a user-defined function. See evalTimer — DolphinDB 1.3 documentation

You can also check the syntax of a function with syntax:

syntax(evalTimer)
// evalTimer(funcs, [count=1])

funcs: the function(s) for which the execution time is measured

count: the number of times funcs will be executed. The default value is 1.

To measure the execution time of function foo:

def foo(){
    x=1
}
a= evalTimer(foo,10);
print(a)
// output: 0.031341

In the above example, the code to be executed is encapsulated into a user-defined function foo. Then use function evalTimer to measure the time of running function foo 10 times, assign the result to variable a, and print it out.

YaN0
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