# Parrallel test run is not working **URL:** \ **Category:** Web Testing\ **Tags:** katalon-studio\ **Created:** [May 10, 2019, 5:30pm UTC](https://forum.katalon.com/t/parrallel-test-run-is-not-working/25122 "2019-05-10T17:30:26Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![ddicocco](https://dub1.discourse-cdn.com/katalon/user_avatar/forum.katalon.com/ddicocco/32/4757_2.png) [@ddicocco](https://forum.katalon.com/u/ddicocco)\ **Post date:** [May 10, 2019, 5:30pm UTC](https://forum.katalon.com/t/parrallel-test-run-is-not-working/25122/1 "2019-05-10T17:30:26Z")
using version 6.1.4 created a test suite collection with one test suite that only had one test case in it. ran the test suite collection with parallel chosen and max concurrent instances set to 6. when I run the test suite collection it is only running the test case that is associated with it once. it pops up my websites login and then closes out. there is not 6 parallel runs going on at the same time. ---
**Author:** ![Russ\_Thomas](https://dub1.discourse-cdn.com/katalon/user_avatar/forum.katalon.com/russ_thomas/32/11884_2.png) [@Russ\_Thomas](https://forum.katalon.com/u/Russ_Thomas)\ **Post date:** [May 10, 2019, 6:20pm UTC](https://forum.katalon.com/t/parrallel-test-run-is-not-working/25122/2 "2019-05-10T18:20:56Z")
`max concurrent instances` does not mean “number of suites to run in parallel”. The way to have two or more suites to run in parallel is to add two or more suites to your collection. IOW, one suite running in parallel is not possible any more than one parallel line is possible. See? Let’s say you added fifty suites. Then, at any instant, fifty tests could be running _at the same time_. That would likely bring your test machine to its knees. And that’s where `max concurrent instances` comes in: You can set it to the maximum number of suites (tests, in effect) that can be executed _at the same time_ on your hardware/OS. (This is not a bug - moved to Web Testing) ---
**Author:** ![ddicocco](https://dub1.discourse-cdn.com/katalon/user_avatar/forum.katalon.com/ddicocco/32/4757_2.png) [@ddicocco](https://forum.katalon.com/u/ddicocco)\ **Post date:** [May 10, 2019, 6:42pm UTC](https://forum.katalon.com/t/parrallel-test-run-is-not-working/25122/3 "2019-05-10T18:42:47Z")
i am an idiot. LOL thank you ---
**Author:** ![Russ\_Thomas](https://dub1.discourse-cdn.com/katalon/user_avatar/forum.katalon.com/russ_thomas/32/11884_2.png) [@Russ\_Thomas](https://forum.katalon.com/u/Russ_Thomas)\ **Post date:** [May 10, 2019, 7:00pm UTC](https://forum.katalon.com/t/parrallel-test-run-is-not-working/25122/4 "2019-05-10T19:00:25Z")
Closed on May 10, 2019, 7:00pm UTC ---
**Author:** ![Ibus](https://avatars.discourse-cdn.com/v4/letter/i/e9a140/32.png) [@Ibus](https://forum.katalon.com/u/Ibus)\ **Post date:** [May 12, 2019, 6:43pm UTC](https://forum.katalon.com/t/parrallel-test-run-is-not-working/25122/5 "2019-05-12T18:43:37Z")
for ‘parallel/concurent’ run of same scene, use jmeter the intended scenario looks more like a performance test, not functional testing