# Parallel Execution is not that much effecient **URL:** \ **Category:** Feature Request\ **Tags:** feature-request, katalon-studio\ **Created:** [April 26, 2019, 11:56am UTC](https://forum.katalon.com/t/parallel-execution-is-not-that-much-effecient/23981 "2019-04-26T11:56:15Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![mariamtamer91](https://avatars.discourse-cdn.com/v4/letter/m/67e7ee/32.png) [@mariamtamer91](https://forum.katalon.com/u/mariamtamer91)\ **Post date:** [April 26, 2019, 11:56am UTC](https://forum.katalon.com/t/parallel-execution-is-not-that-much-effecient/23981/1 "2019-04-26T11:56:15Z")
Dear all, i am currently working on mobile test, where i would like to execute over 10 Testcases for multiple number of android devices connected to my windows 7 PC using normal USB cables. I created Testsuite containing the whole list of the automated testcases, then created a test suite collection and added the testsuite several times and defined the devices and the android drivers. And set the number of the concurrent parallel instances equivalent to the count of the devices, i am testing. Now i am facing the trouble that the Testcases start to execute in parallel normally on all devices and then they get stuck or sometimes the elements are not seen by the driver, although the testsuite runs perfectly green when i run the test cases sequentially. My question is… can Katalon really make parallel execution or should I install appium grid ports for each device previously? If yes, can any one guide me how to make this efficiently working, since i have zero experience in Appium grid. I am currently using Katalon Version: 6.1.1, Appium 1.8.1, selenium-server-standalone-3.7.1.jar Thanks for those who will read my post and try to help. BR, Mariam ---
**Author:** ![hoihoi000a](https://avatars.discourse-cdn.com/v4/letter/h/dec6dc/32.png) [@hoihoi000a](https://forum.katalon.com/u/hoihoi000a)\ **Post date:** [April 30, 2019, 5:32am UTC](https://forum.katalon.com/t/parallel-execution-is-not-that-much-effecient/23981/2 "2019-04-30T05:32:43Z")
I face same problem. Appium seems not working so perfect sometimes, possibly cause program stuck. The node.exe need to be close manually . Already tried Katalon version 6.1.0 , 6.1.1, 6.1.2 Appium version 1.7.1, 1.8.1 Also like this [Console mode errors on only 25% of device: Unable to start app](http://forum.katalon.com/t/console-mode-errors-on-only-25-of-device-unable-to-start-app/11070) ---
**Author:** ![chaurasia.anand](https://avatars.discourse-cdn.com/v4/letter/c/ecd19e/32.png) [@chaurasia.anand](https://forum.katalon.com/u/chaurasia.anand)\ **Post date:** [May 8, 2019, 12:36pm UTC](https://forum.katalon.com/t/parallel-execution-is-not-that-much-effecient/23981/3 "2019-05-08T12:36:41Z")
Hi All, I am also facing similar problem during parallel execution: unknown server-side error occurred while processing the command. Original error: Could not proxy command to remote server. Original error: Error: connect ECONNREFUSED 127.0.0.1:8201 (WARNING: The server did not provide any stacktrace information) I have attached complete trace log [Katalon\_Log.txt](https://europe1.discourse-cdn.com/katalon/original/2X/8/829dbc9653fcc1a8572e3a74baa7a591bac95de8.txt) (10.5 KB) ---
**Author:** ![santwana.bhati](https://avatars.discourse-cdn.com/v4/letter/s/b19c9b/32.png) [@santwana.bhati](https://forum.katalon.com/u/santwana.bhati)\ **Post date:** [October 15, 2020, 5:33pm UTC](https://forum.katalon.com/t/parallel-execution-is-not-that-much-effecient/23981/4 "2020-10-15T17:33:27Z")
@Chris_Trevarthen Hi Chris, I am also facing same issue which @mariamtamer91 highlighted. Do you have any solution on same. Your solutions always worked for me. Thanks ---
**Author:** ![albert.vu](https://dub1.discourse-cdn.com/katalon/user_avatar/forum.katalon.com/albert.vu/32/20595_2.png) [@albert.vu](https://forum.katalon.com/u/albert.vu)\ **Post date:** [August 8, 2022, 7:31am UTC](https://forum.katalon.com/t/parallel-execution-is-not-that-much-effecient/23981/5 "2022-08-08T07:31:50Z")