I think Java is great for server applications, actually. I had to
borrow an idea from the ROCKS guys and have the RRD directory be on a
ramdisk. I then periodically copy this to the harddisk. It works well
though.
How about the bug where people have to specify a timeout in
tcp_accept_channel, or they get corrupted output? I know you mentioned
-1 for the timeout to cause it to block.. That didn't work for me.. I
still had to specify 500000.
So, while we're talking about future ideas.. Have you considered
turning gmond into two programs - a transmitter and receiver? It just
seems to work better in my head with the whole client/server method. I
think (and I could be way off track) that most installations would not
or do not have the gmonds on the compute nodes listening. This would
just cause additional overhead on a CPU-bound system.
It could also make packaging binaries easier - a server package would
have the server gmond, gmetad, web, etc, while the client would have
just the client gmond.
- Josh
Joshua Durham
Computer Systems Engineer
Terascale Computing Facility at Virginia Tech
On Mar 15, 2005, at 10:23 AM, Matt Massie wrote:
guys-
i just put what i believe will be the 3.0.1 release at
http://matt-massie.com/ganglia/
i'm not going to release it until we've tested it here longer and you
guys find it works well for you.
3.0.1.
fixes a bug in gmond using unicast only where a network failure to the
listening gmond can cause the sending gmonds to block indefinitely.
fixes a bug in libmetrics for collecting network statistics on 2.6.x
linux kernels.
adds a feature to gmetad that allows you to specify custom round-robin
archives in gmetad.conf.
fixes a bug in ganglia.spec for starting and stopping ganglia services.
i also have another question for you guys.
how much do you love/hate java? how would you feel about having
gmetad written in java?
i only ask because i'm playing around with jrobin
(http://www.jrobin.org/) and it has some features that rrdtool does
not which we really need. for example... in-memory rrds (sync to disk
whenever you like).. dynamically altering rrd data sources/archives...
databases are cross-platform.
i'm not sold on this idea at all but i wanted to get some early
feedback before i allow my mind to wander any further.
-matt
--
PGP fingerprint 'A7C2 3C2F 8445 AD3C 135E F40B 242A 5984 ACBC 91D3'
They that can give up essential liberty to obtain a little
temporary safety deserve neither liberty nor safety.
--Benjamin Franklin, Historical Review of Pennsylvania, 1759
