> Is there any reason /tmp should have such a heavy write load without any
> files in it?
A convenient way of using temporary files is to open and delete them. It
removes the filename, which hides it from "ls", among other things.
See ngx_open_tempfile in the source, for an example.
Try "lsof /tmp" to see what open filehandles are in that directory.
Good luck with it,
Francis Daly email@example.com