Support Board
Date/Time: Thu, 16 Jan 2025 13:13:53 +0000
Alarm not triggered during scan
View Count: 907
[2017-10-27 12:25:04] |
User112730 - Posts: 41 |
I try to run a scan through a watchlist with numerous symbols. At the beginning of the scan, alarm is triggered when conditions are met. But after the scan has ran for a while, alarm is not triggered anymore. Stopping the scan and clicking on a symbol which should have raised an alarm trigger this alarm. Attached is the chartbook used. |
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[2017-10-27 18:44:49] |
Sierra Chart Engineering - Posts: 104368 |
We made sure that every time the symbol of a chart is changed, that the alert states in the main price graph and studies are reset. Are you scanning Historical Daily charts? If so, this information here may be relevant: Study/Chart Alerts And Scanning: Understanding Scanning Historical Daily Charts We still have to contact Barchart about the hourly historical data download limitation. Sierra Chart Support - Engineering Level Your definitive source for support. Other responses are from users. Try to keep your questions brief and to the point. Be aware of support policy: https://www.sierrachart.com/index.php?l=PostingInformation.php#GeneralInformation For the most reliable, advanced, and zero cost futures order routing, *change* to the Teton service: Sierra Chart Teton Futures Order Routing |
[2017-10-27 19:11:08] |
User112730 - Posts: 41 |
You are right, I am scanning historical data : daily US stock charts (with a study overlayed from weekly chart) Attached is the list of the stocks I try to scan, in case you haven't had them in the previous post; I am aware of the doc you linked : I did a download of these daily data in the morning of european session and to do so I had to split the list in 4 as it seems the hourly limit happen after 19xx symbols. after these hours of download, I ran a scan (still before opening of US session): first symbols meeting the condition rang the alarm as expected. It is only after a while, during this same scan, that the alarm was not triggered anymore on symbols meeting the conditions. Stopping the scan and clicking on those symboles missed by the scan was triggering the alarm. It is a strange behaviour, but as I do not have more detailed trace files or debugging possibilities I cannot investigate more on my side. I also noticed other (what I think are) deviations from expected behaviour : impossible to scan while disconnected, etc. but will adress them in another ticket. If you have some ideas / hints to help me investiguate further on my side, feel free to provide me the information and I would be glad to report the result of the testing. Date Time Of Last Edit: 2017-10-27 19:19:54
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[2017-10-29 11:31:39] |
User112730 - Posts: 41 |
I did some additional tests : Alarm condition =C>1 Only one chartbook with one daily chart, around 5900 symbols in watch list with historical update already done, data feed : SC data - All Services [data] Tested different hypothesis : 1- Set 2000 ms delay in chart settings / Chart update interval 2- unset General settings / "Subscribe RT Data and Download Historical Datga During Scan" and disconnect 3- split the 5900 sym list in smaller list of 1500 symbols and load and scan them one after the other Tested all combinaisons of these 3 hypothesis. Result : Failure : alarm trigger at the begining of the scan, then is not triggered anymore at some point during this scan. There is IMO a high probability that we have a software related issue with scanning numerous symbols in SC. Date Time Of Last Edit: 2017-10-29 11:32:31
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[2017-10-29 11:52:46] |
Sierra Chart Engineering - Posts: 104368 |
Failure to evaluate an alert condition formula during a scan would seem to be very unlikely but we are going to be doing some testing. We have not yet responded because we have been working on a debugging procedure for this. You can certainly run a scan while disconnected from the data feed. That is not a problem at all. Sierra Chart Support - Engineering Level Your definitive source for support. Other responses are from users. Try to keep your questions brief and to the point. Be aware of support policy: https://www.sierrachart.com/index.php?l=PostingInformation.php#GeneralInformation For the most reliable, advanced, and zero cost futures order routing, *change* to the Teton service: Sierra Chart Teton Futures Order Routing |
[2017-10-30 03:16:04] |
Sierra Chart Engineering - Posts: 104368 |
This is now resolved in 1631 which we are putting out now. We are also going to work on adding a feature in the coming days, to log the fully evaluated formula even when it returns false so you can see exactly how it is being interpreted. It is important to understand the current state of the chart and its values and how your formula is using those values during a scan. If there any further problems you can set the Chart Update Interval in Chart >> Chart Settings to 10000 ms to have some time to observe what is happening. Sierra Chart Support - Engineering Level Your definitive source for support. Other responses are from users. Try to keep your questions brief and to the point. Be aware of support policy: https://www.sierrachart.com/index.php?l=PostingInformation.php#GeneralInformation For the most reliable, advanced, and zero cost futures order routing, *change* to the Teton service: Sierra Chart Teton Futures Order Routing |
[2017-10-30 16:48:04] |
User112730 - Posts: 41 |
Tested =C>1 and more complex alarm formula in only 1 time frame on +- 5900 stocks : OK. Tested with a study overlay from a higher time frame : got a few abnormal results (false positive, no false negative) Even if I have another soft + data from SC for comparison and checking, I agree that having the log of fully evaluated formula as interpreted by the code is very usefull and would help a lot, I am looking forward to using this feature in the future. As the false positive / overlayed study error is (I think) not linked to the root cause of the present ticket, I will log another ticket later after some more testing and with a simple case ofr fast evaluation. Big thanks for the work done. My opinion is that we are very close to have a great stock scanner with SC ! Date Time Of Last Edit: 2017-10-30 16:48:25
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[2017-10-30 18:40:59] |
Sierra Chart Engineering - Posts: 104368 |
Just so you know, the reason for this problem had to do with the fact that there was not an alert formula evaluation during a scan when a historical data download needed to be done. That was the source of the problem. It was not an issue having to do with scanning too many symbols. We think this problem arose a few months ago with an unrelated change to reloading of a chart after a download. Sierra Chart Support - Engineering Level Your definitive source for support. Other responses are from users. Try to keep your questions brief and to the point. Be aware of support policy: https://www.sierrachart.com/index.php?l=PostingInformation.php#GeneralInformation For the most reliable, advanced, and zero cost futures order routing, *change* to the Teton service: Sierra Chart Teton Futures Order Routing |
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