I do not find the reply on the forum ... so - I am re-posting this summary (may be - you will find the answer by yourself sorry) :
Forum on trading, automated trading systems and testing trading strategies
All (not yet) about Strategy Tester, Optimization and Cloud
angevoyageur, 2013.08.20 19:47
A must ! Before using it or asking any question : please read the Online Help (Also accessible by F1 on your MT5 platform)
As noted by erdah, SendNotification, SendMail, SendFTP don't work in Strategy Tester (of course).New IndicatorParameters() doesn't work in StrategyTester.OnChartEvent() in Strategy Tester.
Running optimization from command line : https://www.mql5.com/en/forum/13468
Announce of the launch : MQL5 Cloud Network launched.
As Providers (agents)
Work in progress, stay tuned !
If you run only one settings, 1 core will be used.
If you run optimization, all cores will be used.