Support Board
Date/Time: Mon, 17 Mar 2025 18:22:48 +0000
[Programming Help] - Technical consideration for non-stop running SC study
View Count: 483
| [2022-09-15 04:30:01] |
| User857150 - Posts: 11 |
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Hello! I am designing the custom strategy using ACSIL and I faced the problem of the indexing of bars. Let's say I am running my strategy 24/7 non-stop for a month or more. I access the sc. Index every time to perform some calculations on a 1 min resolution. Can there arise a problem that due to running a program for months or years the sc.Index reaches infinity thus crushing the program? Assuming that I am using 1 min graph within months the value of sc.Index may reach high values overflowing int64. How does Siearra work this around? Is there anything I should take into account in this case? A crushed program means that the strategy may not exit certain positions set before the crush. |
| [2022-09-17 16:41:09] |
| ForgivingComputers.com - Posts: 1028 |
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Assuming that I am using 1 min graph within months the value of sc.Index may reach high values overflowing int64.
Not sure how you figured a 64-bit number will overflow in a matter of months. x = 2^64 = 18,446,744,073,709,551,616
y = 1 min bars per year = 60*24*365 = 525,600 x/y = years until overflow = 35,096,545,041,304 If you leave the system running without touching it, your computer will run out of memory (RAM and/or Disk) before sc.Index wraps around. It is a valid concern if you want to maintain a max number of bars on the chart. The Start Date of the chart controls how far back data is loaded. Charts will keep adding bars unless a reload and recalculate is done manually or you can periodically modify the start date with sc.ChartDataStartDate. It will reload the chart after the date change. ACSIL Interface Members - Variables and Arrays: sc.ChartDataStartDate Also, consider that you should be doing regular updates of Sierra Chart. Monthly is a good frequency. This will limit the size of the charts. The old SCID files should also be deleted at least annually to keep the Data folder from getting too big. |
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