This is an old revision of Works/Tests/JavaLike from 2016-05-05 12:03:35..
Производительность виртуальной машины
28.01.2006:
Основание: Первичная оценка производительности виртуальной машины системы OpenSCADA на основе выражения "y=x1+x2", где все переменные глобальные вещественного типа.
| Стадия | Действие | K7_1G-0, мкс |
| 1 | Инициализация списка регистров | 2.3 |
| 2 | Вход в функцию exec() | 3 |
| 3 | Обход команд | 4.4 |
| 4 | Чтение | 9 |
| 5 | Полное время | 10.2 |
17.07.2013:
Основание: Обоснование текущей производительности, оценка и оптимизация. Измерения проводились выборкой минимального времени из пяти вызовов по 1000 исполнений формулы "a -= b*(a-c)" и её сокращений в каждом вызове. Все переменные глобальные вещественного типа.
| Formula | Time on AMDGeode-500 (the operation time), мкс | Notes |
| a -= b*(a-c) | 4.52 (0.74) | |
| a -= b*c | 3.78 (0.72) | |
| a -= b | 3.06 (0.56) => full call: 3.06 (0.49): getValR() = 0.49/2 = 0.245
=> only write const = 2.57 (0.17) => pass.code = 2.4 | |
| a = b | 2.5 (1.21) !> use unified TVariant function setVal() and getVal() = 7.6 (2.7 write only) => fix to 5.0 by prevent default set to string EVAL. => full call: 2.5 (0.33) => only write const: 2.17 (0.47) => only check for type: 1.7 (0.3) => pass code: 1.4 (0.11) | Write to function IO is longer then read from local register by other context call and additional checking for NAN and real modification. |
| Empty | 1.29 | Infrastructure and measurement method utilization time. |
24.04.2016:
Reason: Estimate performance of access to low level IO lines on Raspberry Pi GPIO in different ways of JavaLikeCalc language of OpenSCADA.
Conditions: Raspberry Pi 2, GPIO40, DAQ.BCM2835 (based on library 
bcm2835)
| Operation | Results, us |
| Sleep. Lag on sleep in 1ms measured, which mostly limited by the realtime reaction about 100us. | |
| "SYS.sleep();" | 140 |
| "Special.FLibSYS.fnc_tmSleep();" | 90 |
| Get GPIO pin's level | |
| From an attribute "res = BCM2835.pi2.pi2.gpio17;" | 13.3 |
| By the static accessing function "res = DAQ.BCM2835.pi2.pi2.fnc_get(17);" | 4.2 |
| By the dynamic accessing function "res = SYS.DAQ.BCM2835.pi2.pi2.fnc_get.call(17);" | 145 |
| Put GPIO pin's level | |
| To an attribute "BCM2835.pi2.pi2.gpio18 = true;" | 5.7 |
| By the static accessing function "DAQ.BCM2835.pi2.pi2.fnc_put(18, true);" | 3.7 |
| By the dynamic accessing function "SYS.DAQ.BCM2835.pi2.pi2.fnc_put.call(18, true);" | 140 |