--- title: "MetaTrader 5 build 2815: Access to the Depth of Market from Python, revamped Debugger, and Profiler improvements - Release Notes" description: "The Task Manager enables monitoring of resources consumed by the platform. You can view the amount of memory consumed by charts, CPU... - Release Notes" image: "https://www.metatrader5.com/c/17/0/fig1__1.png" url: "https://www.metatrader5.com/en/releasenotes/terminal/2186" --- # MetaTrader 5 build 2815: Access to the Depth of Market from Python, revamped Debugger, and Profiler improvements ## The Task Manager enables monitoring of resources consumed by the platform. You can view the amount of memory consumed by charts, CPU resources used by Expert Advisors and other performance metrics. If your platform performance slows down, you can easily detect and fix the problem 26 February 2021 ### Terminal 1. Added ability to access Depth of Market data via the [Python API](https://www.mql5.com/en/docs/python_metatrader5). Three new functions allow quick obtaining of data for statistical calculations and machine learning tasks, which can be implemented using a plethora of out-of-the-box Python libraries. - [market_book_add](https://www.mql5.com/en/docs/python_metatrader5/mt5marketbookadd_py) — subscribes the MetaTrader 5 terminal to receive events related to changes in the Depth of Market for the specified symbol. - [market_book_get](https://www.mql5.com/en/docs/python_metatrader5/mt5marketbookget_py) — returns a tuple from BookInfo containing the Depth of Market records for the specified symbol. - [market_book_release](https://www.mql5.com/en/docs/python_metatrader5/mt5marketbookrelease_py) — cancels MetaTrader 5 terminal subscription to events related to changes in the Depth of Market for the specified symbol. 2. The maximum length of Push messages has been increased from 256 to 1024 characters. Now, you can [send](https://www.mql5.com/en/docs/network/sendnotification) more information from your MQL5 programs on mobile devices. 3. Added a preliminary version of the Task Manager, which can be called by pressing the F2 key. The Task Manager enables monitoring of resources consumed by the platform. You can view the amount of memory consumed by charts, CPU resources used by Expert Advisors and other performance metrics. If your platform performance slows down, you can easily detect and fix the problem. ![](https://www.metatrader5.com/c/17/0/fig1__1.png) 4. Enhanced [Subscriptions](https://www.mql5.com/en/forum/340782) service. A special indication has been added for symbols having delayed quotes: - Symbols in Market Watch are marked with a clock icon, and the delay value is displayed in the tooltip - Data delay notification is displayed on charts ![](https://www.metatrader5.com/c/17/0/fig2__1.png) 5. Fixed display of the [Subscriptions](https://www.mql5.com/en/forum/340782) list when there is no trading account connection. 6. Fixed links in emails and newsletters. All links now open in the default browser. Previously, links opened only in Internet Explorer. 7. Fixed connections from the [WebRequest](https://www.mql5.com/en/docs/network/webrequest) function to hosts with IPv6 addresses and Cloudflare protection. 8. Improved functionality and responsiveness of the [VPS service](https://www.mql5.com/en/vps). 9. Improved operation under [Wine](https://www.mql5.com/en/articles/625) and [MacOS/Crossover](https://www.mql5.com/en/articles/619), including the version for macOS Big Sur with the M1 processor. ### MQL5 1. Fixed error in the [ArrayPrint](https://www.mql5.com/en/docs/array/arrayprint) function. The function could occasionally fail to print arrays. 2. Optimized file operations performed by [File*](https://www.mql5.com/en/docs/files) functions. Now, file reading and writing operations run much faster. 3. Removed the restriction requiring the specification of size for the second, third and fourth dimensions of a dynamic array, when the array is used as a function parameter. This increases code reuse and flexibility. ``` void func(int &arr[ ][ ][ ][ ]) { } ``` 4. Fixed [ArrayBsearch](https://www.mql5.com/en/docs/array/arraybsearch) function operation. The function could return an incorrect index of the found element during a binary search. ### MetaEditor 1. More new features have become available in the revamped [debugger](https://www.metatrader5.com/en/metaeditor/help/development/debug). - Arrays are now displayed in the observation window in accordance with the sorting set by [ArraySetAsSeries](https://www.mql5.com/en/docs/array/arraysetasseries). - Added support for local static variables. - Fixed display of the specified array element value. - Fixed handling of 'static' class fields. - Other improvements for more accurate and reliable debugging. 2. Added option "Enable optimizations in profiling". Code optimization mode can be disabled in order to include more details in the profiling report. Code speed without optimization can be several times slower, but this mode provides a wider code coverage. Please note that with optimization code bottlenecks can be imprecise. A milder profiling mode can be set by disabling the "Enable inlining in profiling". ![](https://www.metatrader5.com/c/17/0/fig3__1.png) The optimization management option has also been added to [project settings](https://www.metatrader5.com/en/metaeditor/help/mql5storage/projects#properties). - If optimization is disabled in the project, then the new option is ignored, and thus optimization will always be disabled for profiling (including inlining operations). - If optimization is enabled in the project, then the new option will be taken into account during profiling compilation. 3. Added logging for debugging and profiling processes. Environment settings are logged at operation start; collected data statistics is logged at operation stop. MQL5 profiler starting 'ExpertMACD.ex5' on history with parameters: MQL5 profiler symbol: 'EURUSD' MQL5 profiler period: 'H1' MQL5 profiler date from: '2021.01.01' MQL5 profiler date to: '2021.02.22' MQL5 profiler ticks mode: 'every tick' MQL5 profiler execution delay: 0 ms MQL5 profiler deposit: 10000 MQL5 profiler currency: 'USD' MQL5 profiler leverage: 1:100 MQL5 profiler profit in pips: NO MQL5 profiler profile data received (4640 bytes) MQL5 profiler 758 total measurements, 0/0 errors, 470 kb of stack memory analyzed MQL5 profiler 7782 total function frames found (1929 mql5 code, 342 built-in, 1403 other, 4108 system) ### Tester 1. Fixed specification of non-trading hours in [advanced testing settings](https://www.metatrader5.com/en/terminal/help/algotrading/testing#extended_settings). Updated documentation. **Earlier publications:** - [MetaTrader 5 build 2755: Popup Prices window and Debugger improvements](https://www.metatrader5.com/en/releasenotes/terminal/2180) - [MetaTrader 5 build 2715: General improvements](https://www.metatrader5.com/en/releasenotes/terminal/2172) - [MetaTrader 5 Platform Build 2690: MetaEditor improvements](https://www.metatrader5.com/en/releasenotes/terminal/2168) - [New MetaTrader 5 platform build 2650: Background chart loading and MQL5 code profiler improvements](https://www.metatrader5.com/en/releasenotes/terminal/2163) - [MetaTrader 5 build 2615: Fundamental analysis and complex criteria in the Strategy Tester](https://www.metatrader5.com/en/releasenotes/terminal/2157)