08-01-2011
From the silence, I sense my gut feel is right: they vary tremendously in what they do and how much they load CPU and RAM bus, as well as how well they do it, latency and bandwidth and duplex support and bells and whistles that might be worth it. Probably as bad a video cards! With multicore systems, is CPU cost a worry? Might e slower than an embedded CPU! Good luck. AnandTech has been a good reference in many areas, so he might come through here, too.
http://www.anandtech.com/show/2956/1...-bottleneck-/1
Last edited by DGPickett; 08-01-2011 at 05:17 PM..
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GFREG(1) GFREG(1)
NAME
gfreg - register a Gfarm file, Gfarm file fragments, or a Gfarm directory
SYNOPSIS
gfreg [ -p ] [ -h filesystem-node | -H hostfile | -D domainname ] [ -a architecture ] program ... gfarm-URL
gfreg [ -i ] [ -h filesystem-node | -H hostfile | -D domainname ] localfile ... gfarm-URL
gfreg -N total-num-of-fragments -I fragment-index [ -h filesystem-node | -H hostfile | -D domainname ] localfile ... gfarm-URL
gfreg -r [ -h filesystem-node | -H hostfile | -D domainname ] [ -a architecture ] [ directory | program | localfile ] ... gfarm-URL
DESCRIPTION
The first form copies and registers the program as a Gfarm file gfarm-URL in the Gfarm filesystem. When gfarm-URL is a directory, multiple
programs can be specified. After the registration, the gfarm-URL can be specified as a program name of gfrun(1) and gfmpirun_p4(1). With-
out the -p option, only executable file can be specified. With the -p option, non-executable file can be specified as well. Without the
-a option or the -h option, architecture of the program is assumed to be the same architecture as the client host on that gfreg(1) is exe-
cuted, which is obtained by the Gfarm metaserver.
The second form registers one or more localfiles as a single Gfarm file. Without the -i option, only non-executable file can be specified
as localfile. With the -i option, both excutable and non-executable file can be specified as localfile. The destination filesystem node
will be automatically selected by CPU load average. With any one of -h, -H, -D options, filesystem node can be limited.
The third form registers localfile as a file fragment of a Gfarm file. The total number of fragments and the fragment index are specified
by the -N option and the -I option, respectively. When gfarm-URL is a directory, multiple localfiles can be specified. The destination
filesystemnode will be automatically decided by CPU load average unless any one of -h, -H, -D options is explicitly specified. When the
gfreg command of this form is executed on a filesystem node, the local filesystem node is always selected rather than a remote filesys-
temnode. In this case, -h, -H, -D options help to store files dispersively.
The fourth form registers the directory as a Gfarm directory gfarm-URL, the program or the localfile as a Gfarm file gfarm-URL. If direc-
tory have some sub directories and/or files, they will be registered recursively. The non-executable file localfile will be registered as
a file has one fragment. A non-executable file in the directory will be registered in the same way. When gfarm-URL already exists as a
directory, multiple directories, programs, and localfiles can be specified and they will be registered in gfarm-URL. They can be mixed in
parameteres, while other forms inhibit this manner. If gfarm-URL does not exist, one directory or one program, or one localfile can be
specified and it will be registered as gfarm-URL. Refer to the first form's part above to specify filesystem node thatprogfarms and files
will reside with the -a option or the -h option.
OPTIONS
-f overwrites gfarm-URL even if it exits as a Gfarm file.
-? displays a list of command options.
Gfarm 05 April 2006 GFREG(1)