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EA Memory Management

  • #1
  • First Post: Sep 21, 2020 1:31am Sep 21, 2020 1:31am
h
i
i am developing EA based based on PZ_Divergence indicator which I purchased under the name narun009

I am developing EA for the first time and I would like to know about how the memory is managed when the EA is attached to multiple currenty pairs, do they share same memory or different memory?

If I attach EA to 2 pairs, will it start two different instances of the EA and has no related between between?

Like if I attach the EA to two differet pairs, if the EA one pair updates certain static variables will it affect the other pair which is attached to another instance of EA on the same MT4 platform?

Thanks

Regards,

Arun
  • #2
  • Sep 22, 2020 12:35pm Sep 22, 2020 12:35pm
Quoting balas009
Like if I attach the EA to two differet pairs, if the EA one pair updates certain static variables will it affect the other pair which is attached to another instance of EA on the same MT4 platform?
As far as I know (somebody please correct me if I'm wrong) if you have two EAs attached to different charts (you can only attach one EA to any given chart) then each EA is allocated its own private memory. If you want the EAs to talk to each other, or share data, you could use Global Variables (note: don't confuse these to globals which are private to the EA).

However, note that you can process orders for pairs other than the pair to which the chart is attached. For example, if your EA is attached to a EURUSD chart, you could open a sell order on GBPJPY with OrderSend("GBPJPY",OP_SELL, .....
  • #3
  • Sep 23, 2020 12:49am Sep 23, 2020 12:49am
Quoting hanover
{quote} As far as I know (somebody please correct me if I'm wrong) if you have two EAs attached to different charts (you can only attach one EA to any given chart) then each EA is allocated its own private memory.
I agree with this. My understanding of MT4 architecture is that each chart has two CPU 'threads' (processor time and memory). One thread is for the EA on that chart, the other is for ALL the chart's indicators.. i.e. all the indicators share one CPU thread, which maybe explains why charts can become sluggish when you add too many indicators.
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  • #4
  • Last Post: Sep 23, 2020 4:02am Sep 23, 2020 4:02am
Quoting jagzuk
{quote} I agree with this. My understanding of MT4 architecture is that each chart has two CPU 'threads' (processor time and memory). One thread is for the EA on that chart, the other is for ALL the chart's indicators.. i.e. all the indicators share one CPU thread, which maybe explains why charts can become sluggish when you add too many indicators.

Thanks guys.
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