• Mike Hibler's avatar
    Add client '-f' option for using O_DIRECT open mode for the output device. · 46a62612
    Mike Hibler authored
    On Linux, device IO goes through the buffer cache by default. This makes
    frisbee run really fast...until it closes the output device. Then it sits
    for minutes while it flushes disk data out of the cache. This is
    technically okay, but wasteful, since frisbee allocates its own memory
    for caching disk write data. By using direct IO on the output device,
    writes do not go through the cache.
    
    Aren't two caches better than one? No. They can compete for memory and it
    just causes an extra data copy. Frisbee is faster when using O_DIRECT.
    
    Note that this change is complicated somewhat because Linux requires that
    the IO buffer for an O_DIRECT opened file be sector aligned. So we play
    some games to do this.
    
    This should have no effect on FreeBSD where device writes don't go through
    the buffer cache.
    46a62612
Name
Last commit
Last update
account Loading commit data...
apache Loading commit data...
assign Loading commit data...
autoconf Loading commit data...
backend Loading commit data...
bugdb Loading commit data...
capture Loading commit data...
cdrom Loading commit data...
clientside Loading commit data...
collab Loading commit data...
daikon Loading commit data...
db Loading commit data...
delay Loading commit data...
dhcpd Loading commit data...
discvr Loading commit data...
doc Loading commit data...
event Loading commit data...
firewall Loading commit data...
flash Loading commit data...
hw_config Loading commit data...
hyperviewer Loading commit data...
image-test Loading commit data...
install Loading commit data...
ipod Loading commit data...
mote Loading commit data...
named Loading commit data...
node_usage Loading commit data...
os Loading commit data...
patches Loading commit data...
pelab Loading commit data...
protogeni Loading commit data...
pxe Loading commit data...
rc.d Loading commit data...
robots Loading commit data...
rpms Loading commit data...
security Loading commit data...
sensors Loading commit data...
sql Loading commit data...
ssl Loading commit data...
sysadmin Loading commit data...
tbsetup Loading commit data...
testsuite Loading commit data...
tip Loading commit data...
tmcd Loading commit data...
tools Loading commit data...
utils Loading commit data...
vis Loading commit data...
wiki Loading commit data...
www Loading commit data...
xmlrpc Loading commit data...
.gitattributes Loading commit data...
.gitignore Loading commit data...
.gitmodules Loading commit data...
.loc-ignore Loading commit data...
AGPL-COPYING Loading commit data...
GNUmakefile.in Loading commit data...
GNUmakerules Loading commit data...
GPL-COPYING Loading commit data...
LGPL-COPYING Loading commit data...
MOVED-TO-WIKI Loading commit data...
Makeconf.in Loading commit data...
README Loading commit data...
TODO Loading commit data...
TODO.plab Loading commit data...
VERSION Loading commit data...
WEBtemplate.in Loading commit data...
config.h.in Loading commit data...
configure Loading commit data...
configure.in Loading commit data...
defs-aerolab Loading commit data...
defs-calfeld-emulab Loading commit data...
defs-davidand-emulab Loading commit data...
defs-default Loading commit data...
defs-duerig-emulab Loading commit data...
defs-elabinelab Loading commit data...
defs-example Loading commit data...
defs-example-privatecnet Loading commit data...
defs-fbsd7 Loading commit data...
defs-fish-emulab Loading commit data...
defs-gatech Loading commit data...
defs-gtw-emulab Loading commit data...
defs-johnsond-emulab Loading commit data...
defs-kevina-emulab Loading commit data...
defs-kwebb-emulab Loading commit data...
defs-mike-emulab Loading commit data...
defs-newbold-emulab Loading commit data...
defs-newbold-macdb Loading commit data...
defs-ricci-emulab Loading commit data...
defs-shash-emulab Loading commit data...
defs-stoller-emulab Loading commit data...
defs-stoller-home Loading commit data...
defs-stoller-lbsdb Loading commit data...
defs-uky Loading commit data...
defs-utahclient Loading commit data...
defs-wbsun-emulab Loading commit data...
defs-wide Loading commit data...