[R-sig-hpc] snowfall with several users on the same machine

[Bertrand Michel]

Dear r-help list,

We are three peoples using the same Mac Os with 24 cores (Mac server,
R 2.13.2). We are currently using snowfall for parallel computing. It
works well if only one of us uses snowfall. But if two users try
in the same time to create a cluster (in two separate R sessions), then R
sends the following error message :

> sfInit(parallel=TRUE, cpus=4)
Error in socketConnection(port = port, server = TRUE, blocking = TRUE,
 :   impossible d'ouvrir la connexion
De plus : Message d'avis : In socketConnection(port = port, server =
TRUE, blocking = TRUE,  :   port 10187 cannot be opened
Erreur dans sfInit(parallel = TRUE, cpus = 4) :   Starting of snow
cluster failed! Error in socketConnection(port = port, server = TRUE,
blocking = TRUE,  :
  impossible d'ouvrir la connexion
 Error in socketConnection(port = port, server = TRUE, blocking =
TRUE,  :   impossible d'ouvrir la connexion


Is anyone on this list has an explanation ?
Does  it means that sfCluster is required when several users use
snowfall on separate sessions ?
Thanks for your help,

Bertrand