# Haddock2.4 on multiprocessors? **URL:** \ **Category:** HADDOCK\ **Created:** [February 18, 2022, 4:23am UTC](https://ask.bioexcel.eu/t/haddock2-4-on-multiprocessors/3461 "2022-02-18T04:23:35Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![mohammad-khatami](https://avatars.discourse-cdn.com/v4/letter/m/dbc845/32.png) [@mohammad-khatami](https://ask.bioexcel.eu/u/mohammad-khatami)\ **Post date:** [February 18, 2022, 4:23am UTC](https://ask.bioexcel.eu/t/haddock2-4-on-multiprocessors/3461/1 "2022-02-18T04:23:35Z")
Hello there, Is it possible to run haddock2.4 on multiprocessors? using mpi perhaps? I have it running locally on my PC but it only uses 1 CPU. Best, Mohammad ---
**Author:** ![amjjbonvin](https://dub1.discourse-cdn.com/flex013/user_avatar/ask.bioexcel.eu/amjjbonvin/32/23_2.png) [@amjjbonvin](https://ask.bioexcel.eu/u/amjjbonvin)\ **Post date:** [February 18, 2022, 8:10am UTC](https://ask.bioexcel.eu/t/haddock2-4-on-multiprocessors/3461/2 "2022-02-18T08:10:54Z")
Of course! Check the online tutorial for a local installation of haddock2.4: > **[Tutorial describing the use of a local version of HADDOCK2.4](https://www.bonvinlab.org/education/HADDOCK24/HADDOCK24-local-tutorial/#configuring-haddock)** > > A tutorial describing the use a local version HADDOCK2.4 ---
**Author:** ![mohammad-khatami](https://avatars.discourse-cdn.com/v4/letter/m/dbc845/32.png) [@mohammad-khatami](https://ask.bioexcel.eu/u/mohammad-khatami)\ **Post date:** [February 18, 2022, 1:53pm UTC](https://ask.bioexcel.eu/t/haddock2-4-on-multiprocessors/3461/3 "2022-02-18T13:53:32Z")
I set NUMJOB=4, but still, I get a single cpu running on my PC. I guess I would need slurm or torque ? or can I just “set NUMJOB=4” in the configuration file, and when I run the command “haddock2.4” it would execute the code on 4 CPUs? ---
**Author:** ![amjjbonvin](https://dub1.discourse-cdn.com/flex013/user_avatar/ask.bioexcel.eu/amjjbonvin/32/23_2.png) [@amjjbonvin](https://ask.bioexcel.eu/u/amjjbonvin)\ **Post date:** [February 18, 2022, 2:14pm UTC](https://ask.bioexcel.eu/t/haddock2-4-on-multiprocessors/3461/4 "2022-02-18T14:14:20Z")
You will need to reconfigure haddock it you change those parameters Also make sure to check/change the concat option to 1. And you can edit the run.cns file and check the value for cpunumber\_1 (this is what is configured when you perform the installation). ---
**Author:** ![mohammad-khatami](https://avatars.discourse-cdn.com/v4/letter/m/dbc845/32.png) [@mohammad-khatami](https://ask.bioexcel.eu/u/mohammad-khatami)\ **Post date:** [February 18, 2022, 2:46pm UTC](https://ask.bioexcel.eu/t/haddock2-4-on-multiprocessors/3461/5 "2022-02-18T14:46:21Z")
changing the cpunumber\_1 worked! not sure what you mean by “Also make sure to check/change the concat option to 1.” where should I do it? ---
**Author:** ![amjjbonvin](https://dub1.discourse-cdn.com/flex013/user_avatar/ask.bioexcel.eu/amjjbonvin/32/23_2.png) [@amjjbonvin](https://ask.bioexcel.eu/u/amjjbonvin)\ **Post date:** [February 18, 2022, 3:39pm UTC](https://ask.bioexcel.eu/t/haddock2-4-on-multiprocessors/3461/6 "2022-02-18T15:39:03Z")
and bit down the page: To define the number of concatenated models edit Haddock/Main/QueueSubmit\_concat.py located in the haddock2.4 installation directory and change the values as required: ```auto jobconcat["0"] = 5 jobconcat["1"] = 1 jobconcat["2"] = 1 ``` If running on local system, change all values to 1. ---
**Author:** ![mohammad-khatami](https://avatars.discourse-cdn.com/v4/letter/m/dbc845/32.png) [@mohammad-khatami](https://ask.bioexcel.eu/u/mohammad-khatami)\ **Post date:** [February 22, 2022, 7:25pm UTC](https://ask.bioexcel.eu/t/haddock2-4-on-multiprocessors/3461/7 "2022-02-22T19:25:42Z")
Thanks. I will try it out.