Re: [HTCondor-users] Why does HTCondor replace my executable with condor_exec.exe on Linux?

[Carl Edquist <edquist@xxxxxxxxxxx>]

> When I condor_submit a job that tells it to run 
> /Volume/my/network/shared/drive/foo.a, it seems to run correctly. 
> However when I print argv[0], it shows condor_exec.exe instead of foo.a.

Seems like you might be able to work around this with a wrapper script 
that exec's your real binary, which should [re]set argv[0]; something like

	#!/bin/bash
	exec /Volume/my/network/shared/drive/foo.a "$@"

Or else do it right from the submit file:

	executable = /bin/bash
	arguments = "-c 'exec /Volume/my/network/shared/drive/foo.a ...'"


Not sure whether these are considered "recommended practice", but either 
way it should re-replace the "condor_exec.exe" in argv[0] with 
"/Volume/my/network/shared/drive/foo.a", if you need that.

Carl

On Thu, 4 Aug 2016, Michael Di Domenico wrote:

> On Thu, Aug 4, 2016 at 10:43 AM, Nathan W. Panike
> <nathan.panike@xxxxxxxxx> wrote:
> > This is documented behavior
> >
> > https://research.cs.wisc.edu/htcondor/manual/v8.4/2_15Potential_Problems.html
> >
> > On Thu, Aug 4, 2016 at 5:05 AM, Jason Liu <jason.liu@xxxxxxxxxxxxx> wrote:
> > > When I condor_submit a job that tells it to run
> > > /Volume/my/network/shared/drive/foo.a, it seems to run correctly. However
> > > when I print argv[0], it shows condor_exec.exe instead of foo.a. This is
> > > version 8.4.7 on Ubuntu 14.01.
> > >
> > > Why does HTCondor do this? Is this a bug?
> > >
> > > Reading the source code, it looks like OsProc::StartJob() is deliberately
> > > replacing argv[0] with condor_exec.exe. Can someone explain this behaviour?
>
> A better question would be, whether there is a way to turn it off?
> Under 99% of our use cases i don't really care that argv[0] is
> replaced, except when GPU's are concerned.
>
> when you run nvidia-smi, instead of seeing which program is attached
> to which gpu, it only shows the condor exec strings, which is
> annoying, but doesn't actually impact anything
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