Frequently asked questions about GEOS-Chem: Difference between revisions
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=== GEOS-Chem seems to be running too slowly. What can I do? === | === GEOS-Chem seems to be running too slowly. What can I do? === | ||
There are several ways to [https://geos-chem.readthedocs.io/en/latest/gcc-guide/05-run/run-speedup.html speed up a slow GEOS-Chem simulation]. | |||
If you are archiving many diagnostic quantities are a high temporal resolution (e.g. every hour), then this will increase the run time of your simulation. You can try saving out less diagnostic quantities, or archiving at a lower temporal resolution (e.g. every day). | If you are archiving many diagnostic quantities are a high temporal resolution (e.g. every hour), then this will increase the run time of your simulation. You can try saving out less diagnostic quantities, or archiving at a lower temporal resolution (e.g. every day). | ||
Revision as of 19:18, 10 August 2022
On this page we shall answer some commonly asked questions about GEOS-Chem.
Basic information about GEOS-Chem
For new users
- I am a GEOS-Chem new user. What is expected of me?
- Where can I find user manuals for GEOS-Chem and related software?
- Can I use GEOS-Chem on cloud-computing platforms?
- What types of simulations can I run with GEOS-Chem?
- What is the horizontal resolution and vertical resolution of GEOS-Chem?
- Which meteorological data fields can be used by GEOS-Chem?
- To whom can I direct GEOS-Chem-related questions?
- What does the GEOS-Chem Steering Committee do?
- What do the GEOS-Chem Working Groups do?
- What does the GEOS-Chem Support Team do?
- I see that there are several GEOS-Chem email lists. How can I subscribe?
Science questions
Where can I find information about ...
- the available chemical mechanisms in GEOS-Chem?
- the bromine chemistry mechanism in GEOS-Chem?
- the KPP chemical solver?
- the Linoz stratospheric ozone chemistry scheme?
- the stratospheric chemistry mechanism?
- Other chemistry simulations such as CO2, CH4, Hg, etc.?
- emissions options in GEOS-Chem?
- the advection scheme in GEOS-Chem?
- the boundary layer mixing schemes in GEOS-Chem?
- the cloud convection schemes in GEOS-Chem?
- The Dry deposition and Wet deposition schemes in GEOS-Chem?
- GEOS-Chem nested grid simulations?
--Bob Yantosca (talk) 17:45, 2 January 2019 (UTC)
Technical issues
- How do I download the GEOS-Chem source code and run directories?
- What should I do when I encounter an error while running GEOS-Chem?
- Do you have any information about GEOS-Chem performance and GEOS-Chem scalability?
- Where can I learn more about the GEOS-Chem Makefiles?
- Is there a comprehensive list of GEOS-Chem bug reports?
- Do you have any information on how I can debug GEOS-Chem or HEMCO errors?
Parallelization issues
- How can I tell if a variable has to be declared with !$OMP PRIVATE or !$OMP SHARED?
- How many CPUs may I use for my GEOS-Chem simulation?
- Why is GEOS-Chem not using all the CPUs that I requested?
High-Performance GEOS-Chem (GCHP)
Please see the GCHP user manual at gchp.readthedocs.iofor more information.
Where can I get restart files for GEOS-Chem?
For instructions on how to obtain a set of sample restart files that you can use to spin up your own simulations, please see the Restart Files section of our GEOS-Chem basics wiki page.
--Bob Yantosca (talk) 16:24, 6 January 2017 (UTC)
Running GEOS-Chem
Please see our Running GEOS-Chem wiki page.
How long does GEOS-Chem take to run?
It depends on your particular computing environment. We have posted several timing results from GEOS-Chem 7-day time test simulations.
GEOS-Chem seems to be running too slowly. What can I do?
There are several ways to speed up a slow GEOS-Chem simulation.
If you are archiving many diagnostic quantities are a high temporal resolution (e.g. every hour), then this will increase the run time of your simulation. You can try saving out less diagnostic quantities, or archiving at a lower temporal resolution (e.g. every day).
GEOS-Chem errors
Please also see our Guide to GEOS-Chem error messages and Debugging GEOS-Chem pages.
GEOS-Chem died with an error. What can I do?
Please see Understanding the different categories of errors section of our Guide to GEOS-Chem error messages.
--Bob Yantosca (talk) 14:40, 17 June 2019 (UTC)