I couldn't find this in the documentation, so I am wondering if a scheduled function (schedule_function) can be running while handle_data is running (I guess no, but just to be sure)?
I haven't noticed any actual concurrency, but I have had to cause handle_data to skip scheduled minutes so I don't do certain things twice, or make sure they are idempotent.
Scheduled functions are not asynchronous. If two scheduled functions are supposed to run at the same time, they will happen sequentially, in the order in which they were created.
Note that handle_data runs before any functions scheduled to run in the same minute.
Note, also, that scheduled functions have the same timeout restrictions as handle_data, i.e., the total amount of time taken up by handle_data and any scheduled_functions for the same minute can't exceed 50 seconds.
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Great clarification Jonathan!
Would it be possible to add it to the online documentation at https://www.quantopian.com/help ?
I'll see what I can do. ;-)
Disclaimer
The material on this website is provided for informational purposes only and does not constitute an offer to sell, a solicitation to buy, or a recommendation or endorsement for any security or strategy, nor does it constitute an offer to provide investment advisory services by Quantopian. In addition, the material offers no opinion with respect to the suitability of any security or specific investment. No information contained herein should be regarded as a suggestion to engage in or refrain from any investment-related course of action as none of Quantopian nor any of its affiliates is undertaking to provide investment advice, act as an adviser to any plan or entity subject to the Employee Retirement Income Security Act of 1974, as amended, individual retirement account or individual retirement annuity, or give advice in a fiduciary capacity with respect to the materials presented herein. If you are an individual retirement or other investor, contact your financial advisor or other fiduciary unrelated to Quantopian about whether any given investment idea, strategy, product or service described herein may be appropriate for your circumstances. All investments involve risk, including loss of principal. Quantopian makes no guarantees as to the accuracy or completeness of the views expressed in the website. The views are subject to change, and may have become unreliable for various reasons, including changes in market conditions or economic circumstances.
Thanks Jonathan - that info about handle_data always being called before any schedule_function invocations in the same minute is actually very useful to know.
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The material on this website is provided for informational purposes only and does not constitute an offer to sell, a solicitation to buy, or a recommendation or endorsement for any security or strategy, nor does it constitute an offer to provide investment advisory services by Quantopian.
In addition, the material offers no opinion with respect to the suitability of any security or specific investment. No information contained herein should be regarded as a suggestion to engage in or refrain from any investment-related course of action as none of Quantopian nor any of its affiliates is undertaking to provide investment advice, act as an adviser to any plan or entity subject to the Employee Retirement Income Security Act of 1974, as amended, individual retirement account or individual retirement annuity, or give advice in a fiduciary capacity with respect to the materials presented herein. If you are an individual retirement or other investor, contact your financial advisor or other fiduciary unrelated to Quantopian about whether any given investment idea, strategy, product or service described herein may be appropriate for your circumstances. All investments involve risk, including loss of principal. Quantopian makes no guarantees as to the accuracy or completeness of the views expressed in the website. The views are subject to change, and may have become unreliable for various reasons, including changes in market conditions or economic circumstances.