What can cause slowdown and timeout in the clients?

Things to check:

• Your network connection, are any other applications having a problem?
• Are you running out of memory? Processing large datasets can cause problems
• Is your server's HOME directory on a network share?

When performing some operations the clients make use of temporary file storage and log directories. By default these files are stored below the users HOME directory in $HOME/omero/tmp, $HOME/omero/log and $HOME/omero/sessions. If your home(~) directory $HOME is stored on a network, possibly NFS mounted (or similar), then these temporary files are being written and read over the network. This can slow access down.

The OMERO.server also accesses the $HOME/omero/tmp and $HOME/omero/log folders of the user the server process is running as. As the server makes heavier use of these folders than the clients, if the OMERO.server user's home(~) is stored on a network drive then slow performance can occur.

To resolve this issue for the OMERO.server you can define an OMERO_TEMPDIR environment variable pointing to a temporary directory located on the local file system (e.g. /tmp/).