This manual page documents briefly the
dbench and
tbench benchmarks.
This manual page was written for the Debian GNU/Linux distribution
because the original program does not have a manual page. However,
it has fairly easy to read source code.
Netbench is a terrible benchmark, but it's an "industry standard" and
it's what is used in the press to rate windows fileservers like Samba
and WindowsNT.
Given the requirements of running netbench (60 and 150 Windows PCs all
on switched fast ethernet and a really grunty server, and some way to
nurse all those machines along so they will run a very fussy benchmark
suite without crashing), these programs were written to open up
netbench to the masses.
Both dbench and tbench read a load description file called
client.txt that was derived from a network sniffer dump of a real
netbench run. client.txt is about 4MB and describes the 90 thousand
operations that a netbench client does in a typical netbench run. They
parse client.txt and use it to produce the same load without having to
buy a huge lab.
dbench produces only the filesystem load. It does all the same IO
calls that the smbd server in Samba would produce when confronted with
a netbench run. It does no networking calls.
tbench produces only the TCP and process load. It does the same socket
calls that smbd would do under a netbench load. It does no filesystem
calls. The idea behind tbench is to eliminate smbd from the netbench
test, as though the smbd code could be made infinately fast.
OPTIONS
The dbench program takes a number, which indicates the number of clients to run simultaneously. It can also take the following options:
-c client.txt
Use this as the full path name of the client.txt file (the default is
/usr/share/dbench/client.txt).
-s
Use synchronous file IO on all file operations.
-S
Use synchronous IO for all directory operations (unlink, rmdir, mkdir
and rename).
The tbench program takes a number, which indicates the number of
clients to run simultaneously, and a server name: tbench_srv
should be invoked on that server before invoking tbench.
tbench can also take the following options:
-c client.txt
Use this as the full path name of the client.txt file (the default is
/usr/share/dbench/client.txt).
-t option[,...]
This sets the socket options for the connection to the server. The
options are a comma-separated list of one or more of the following:
"SO_KEEPALIVE" , "SO_REUSEADDR" , "SO_BROADCAST" , "SO_NODELAY" , "SO_LOWDELAY" , "SO_THROUGHPUT" , "SO_SNDBUF" =number, "SO_RCVBUF" =number, "SO_SNDLOWAT" =number, "SO_RCVLOWAT" =number, "SO_SNDTIMEO" =number, and "SO_RCVTIMEO" =number. See
socket(7) for details about these options.
The tbench_srv can only take one option:
-t option[,...] as documented above.
SEE ALSO
/usr/share/doc/dbench/README contains the original README by Andrew Tridgell which accompanies the
dbench source.
AUTHOR
This manual page was written by Paul Russell <prussell@alderaan.franken.de>,
for the Debian GNU/Linux system (but may be used by others).