public static double getPerTaskConfigSize() {
        return perTaskConfigSize;
    }
@Test
    void testGetPerTaskConfigSize() {
        double defaultVal = ParamUtil.getPerTaskConfigSize();
        assertEquals(defaultPerTaskConfigSize, defaultVal, 0.01);
        
        double expect = 50.0;
        ParamUtil.setPerTaskConfigSize(expect);
        assertEquals(expect, ParamUtil.getPerTaskConfigSize(), 0.01);
    }