Yes, there are several (Ruby) threads working during this gc_sweep.  
Some are performing network operations, some file IO.

On Nov 24, 2003, at 11:15 AM, ts wrote:

>>>>>> "R" == Richard Kilmer <rich / infoether.com> writes:
>
> R> We still encountered a gc_sweep in our use of Ruby 1.8 on Linux 
> (v8).
>
>  Do you use threads ?
>
>
> Guy Decoux
>
>