Re: [HTCondor-users] slow creation of condor_shadow processes

[Todd L Miller <tlmiller@xxxxxxxxxxx>]

> Finally able to get the parameters due to which it was happening but didn't
> understand why it's happening.

	IIRC, HTCondor closes (almost?) all FDs after fork()ing* but 
before exec()ing the shadow.  There was not, until relatively recently, a 
way to close all the FDs associated with a process; you had to make a 
system call for each FD.  When you have to close 102,400 FDs, that's a lot 
of system calls, and it takes a while.

- ToddM

*: On Linux, HTCondor actually calls clone().