Performance testing

To measure performance, we used a variant of Dhrystone 2 Test originally taken from this page. The Original version used clock() to calculate delta time. Which is good for a real pc, but is not very accurate for a dosbox emulator. When the clock() call happened, a modified version sends ~>dtime marker to stdout which is intercepted by the test page and used to calculate delta time with performance.now() from the browser. Source code of the modified test is here.

Basically, this test produces a lot of int operations and measures the amount of operations (Dhrystones) produced per second. Output is a VAX MIPS RATING which is Drhystones per second divided by 1757 (is as DEC VAX 11/780 result).

Running the test

To run the test visit Test page. You can choose any backend you want.