Re: [HTCondor-users] pid_max on Linux

[Greg Thain <gthain@xxxxxxxxxxx>]

On 4/22/22 10:56, Marco van Zwetselaar wrote:
> Hi Gerard,
>
> On 22/04/2022 18:39, Weatherby,Gerard wrote:
> > Is it possible to persuade the condor daemon not to reset 
> > kernel.pid_max when it restarts? We have a legacy application that 
> > does not like high pid numbers.
>
> I suppose you could do this by either changing GLOBAL_MAX_PROCESSES in 
> /usr/lib/condor/libexec/linux_kernel_tuning, or turning off "kernel 
> tuning" altogether in /etc/condor/condor_config: ENABLE_KERNEL_TUNING 
> = false. I prefer the latter, and set the required sysctl values in 
> /etc/sysctl.d/ (as they are system-wide and shouldn't be trigged by 
> the startup of any specific service). 


Either of these methods works. Note that condor only increases the 
maximum number of processes on schedd machines, so that it can run with 
a huge number of shadows (usually one shadow per running job), and thus 
a large number of jobs. So, if you set

ENABLE_KERNEL_TUNING = false

I would only do that on the schedd machines, so that you get the 
collected wisdom of this script on the other machines in your pool.


-greg