Re: [Condor-users] out-of-memory issues in parallel universe

[Greg Thain <gthain@xxxxxxxxxxx>]

> Is there some way of specifying the image size, and restricting jobs  
> to larger memory compute nodes, for MPI jobs submitted in the parallel  
> universe?

By default, Condor tries to run jobs only on machines that have enough 
memory.  Condor_submit does this by sticking the clause:

((Memory * 1024) >= ImageSize)

into the job's requirements.  The problem is that Condor doesn't know a 
priori how much memory the job will need (the ImageSize).  So, it makes 
an initial guess based on the size of the executable.  This guess is 
almost always wrong, almost always too small.  If you have a better 
guess as to the image size, you can put it in the submit file:

image_size = some_value_in_kbytes

And Condor will only match the job to machines (or slots) with at least 
that amount of memory.

-greg