Robert Cemper · Mar 19 2m read

Compare Global Write in ePy vs. ISOS/COS

This example demonstrates the difference you may experience when you write to
Gllobals directly from Embedded Python compared to native ObjectScript.

To make this demo useful I start 2 background jobs that simply write sequentially
to a dedicated global. A common control method signals for a synchronous start.
Similar a common stop & view interrupts data feeding.

That's the principle process:


As 2 jobs run in parallel the probability of just using sequential blocks is reduced.
During the development of this demo, I detected that the JOB command has problems
with ClassMethods in Embedded Python.

Due to the poor dimensioned Community License the start of the background jobs
may fail if you have other connections active at the same time.

During my series of tests, I found that ePy writes ~53% of the pure ISOS code
See also examples below.

The control method prepares the background processes and has 3 commands:

  • 0 .. stop background jobs and show last run results
  • 1 .. interrupt background jobs and show last run results
  • 2 .. run data load in background jobs.
    • Loading is interrupted after 60 sec to prevent breaking of the DB if not done manually

How to Test it

Connect to the container using webterminal or
start an IRIS session in docker

   docker-compose exec iris iris session iris

or use



USER>do ##class(dc.rcc.ePYvsISOS).do()

JobStart ISOS #3841
JobStart  ePy #3842
Job Control [0=stop,1=view,2=go]: 2
Job Control [0=stop,1=view,2=go]: 1
^ePy(1,492029)=2022-03-11 20:49:32.851286
^ISOS(1,927383)=2022-03-11 20:49:32.851289

Job Control [0=stop,1=view,2=go]:
Job Control [0=stop,1=view,2=go]: 2
Job Control [0=stop,1=view,2=go]:
Job Control [0=stop,1=view,2=go]:
Job Control [0=stop,1=view,2=go]:
Job Control [0=stop,1=view,2=go]:
^ePy(2,4149270)=2022-03-11 20:50:54.620362
^ISOS(2,7719690)=2022-03-11 20:50:54.620371

Job Control [0=stop,1=view,2=go]:2
Job Control [0=stop,1=view,2=go]:
Job Control [0=stop,1=view,2=go]: 0
^ePy(3,3148765)=2022-03-11 20:50:54.620362
^ISOS(3,6714519)=2022-03-11 20:50:54.620371


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