# \-multi option with mdrun in GROMAS + PLUMED

**URL:** <https://gromacs.bioexcel.eu/t/multi-option-with-mdrun-in-gromas-plumed/4062>\
**Category:** User discussions\
**Created:** [April 23, 2022, 2:53pm UTC](https://gromacs.bioexcel.eu/t/multi-option-with-mdrun-in-gromas-plumed/4062 "2022-04-23T14:53:11Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![prithwish](https://avatars.discourse-cdn.com/v4/letter/p/3bc359/32.png) [@prithwish](https://gromacs.bioexcel.eu/u/prithwish)\
**Post date:** [April 23, 2022, 2:53pm UTC](https://gromacs.bioexcel.eu/t/multi-option-with-mdrun-in-gromas-plumed/4062/1 "2022-04-23T14:53:12Z")

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GROMACS version: 2019.6 (dp)  
GROMACS modification: No

Hi,

It looks like GROMACS (2019.6) no more supports -multi option with mdrun for multiple walker in funnel metadynamics with PLUMED.

Is there any workaround?

Best,

PN

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**Author:** ![pszilard](https://dub1.discourse-cdn.com/flex017/user_avatar/gromacs.bioexcel.eu/pszilard/32/21_2.png) [@pszilard](https://gromacs.bioexcel.eu/u/pszilard)\
**Post date:** [April 26, 2022, 9:33am UTC](https://gromacs.bioexcel.eu/t/multi-option-with-mdrun-in-gromas-plumed/4062/2 "2022-04-26T09:33:49Z")

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Hi,

`mdrun -multidir` should work, unless it’s patched out by PLUMED.

Cheers,  
Szilárd

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**Author:** ![amnah](https://avatars.discourse-cdn.com/v4/letter/a/8e7dd6/32.png) [@amnah](https://gromacs.bioexcel.eu/u/amnah)\
**Post date:** [June 29, 2022, 6:13pm UTC](https://gromacs.bioexcel.eu/t/multi-option-with-mdrun-in-gromas-plumed/4062/3 "2022-06-29T18:13:21Z")

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> [@pszilard](#):
>
> `mdrun -multidir` should work, unless it’s patched out by PLUMED

in case of using GROMACS patched with PLUMED, what is the alternative command instead of -multi and -multidir?

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**Author:** ![pszilard](https://dub1.discourse-cdn.com/flex017/user_avatar/gromacs.bioexcel.eu/pszilard/32/21_2.png) [@pszilard](https://gromacs.bioexcel.eu/u/pszilard)\
**Post date:** [July 5, 2022, 10:30am UTC](https://gromacs.bioexcel.eu/t/multi-option-with-mdrun-in-gromas-plumed/4062/4 "2022-07-05T10:30:38Z")

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> [@amnah](#):
>
> in case of using GROMACS patched with PLUMED, what is the alternative command instead of -multi and -multidir?

I don’t know, that is something you should ask on the PLUMED forums.

However a simple Google search suggests that multidir should work with PLUMED: [plumed gromacs multidir - Google Search](https://www.google.com/search?q=plumed+gromacs+multidir)

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**Author:** ![amnah](https://avatars.discourse-cdn.com/v4/letter/a/8e7dd6/32.png) [@amnah](https://gromacs.bioexcel.eu/u/amnah)\
**Post date:** [July 5, 2022, 2:41pm UTC](https://gromacs.bioexcel.eu/t/multi-option-with-mdrun-in-gromas-plumed/4062/5 "2022-07-05T14:41:25Z")

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Thank you for answering  
Problem solved!

I was able to generate 40 replicas of the system and the replica-exchange solute tempering (REST) test was processed with no errors. I analyzed the results and there is good PE overall between the replicas  
I just have some concerns about the number of replicas, are 40 replicas too much? should I reduce the number of replicas?