[clamav-users] parallel processes fail at startup when clamd is running

[JOHN URBAN]

> On 11/28/2022 11:23 AM Andrew C Aitchison via clamav-users <clamav-users at lists.clamav.net> wrote:
> 
>  
> On Mon, 28 Nov 2022, JOHN URBAN via clamav-users wrote:
> 
> > We are experiencing a large number of MPI jobs failing indicating
> > the fabric is unavailable when the scans are running. Early in the
> > investigation so not sure if locking, timing, response time or other
> > factors are involved, but I wanted to ask a quick gernal question to
> > see if this is a known issue with easy answers. If not, we will post
> > more detailed information as it is determined.
> 
> Not an issue that I am familiar with.
> 
> Are the MPI jobs related to clamav, or just running
> on a system with clamav ?
> 
> Is clamav doing on-access analysis ?  If so I wonder whether it is
> attempting to access the same file, or worse same file-handle, for
> each mpi thread, simultaneously.
> 
> If I remember correctly "fabric" can be a technical term to do with
> message passing, parallelism and networking.
> Is that how you are using it ?
> 
> -- 
> Andrew C. Aitchison                      Kendal, UK
>                     andrew at aitchison.me.uk
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Yes; it covers all the parts to create a network connection, simplest definition is probably "The communications network MPI constructs either by itself or using a daemon". So it covers if you are using IB, ethernet, and so on in particular. In this case they are Infiniband connections using an OFA layer.  A connection can include the authentication method and process, the hardware used to pass messages, the protocol used, which libraries and even which compiler was used in the most general usage.