Re: [distcc] Multiple people running distcc at once, using one DISTCC_DIR

[Jake McGuire]

File locking over NFS is a complex operation, much more so than on a 
local disk, and distcc can do a whole lot of it.  Depending on the 
network and the load on the cluster, I'd not be surprised if the file 
locking took more time than actually distributing the .i file and 
getting back the .o file.

Using a hardware loadbalancer seems like the most robust solution, but 
I've got no idea how much those cost.

-jake
On Sep 21, 2004, at 12:34 PM, Victor Norman wrote:
Dan,
I remember reading that caveat.  But, I'd like to know more: Why 
doesn't having
DISTCC_DIR on NFS work well?  Are there known problems with file 
locking and
NFS?  Other reasons?  Problems that I could fix with some work?

I'm not giving up so easily... :-)
Vic

--- Daniel Kegel <[EMAIL PROTECTED]> wrote:
Victor Norman wrote:
--- Daniel Kegel <[EMAIL PROTECTED]> wrote:
I don't think you should be sharing a .distcc directory between
multiple users.  It's not a common configuration, and there are
sure to be problems.
Does "the community" agree?  I thought this was the recommended 
setup.
http://distcc.samba.org/faq.html#monitor-nfs says
"Having DISTCC_DIR on NFS doesn't work well at the moment.
Please set DISTCC_DIR to a local directory instead."
If I don't share a common .distcc directory then how do I solve my
worst-case
scenario: 15 developers suddenly have to compile the entire tree.  
They all
put
only the best hosts into their host files (because, after all, they 
each
want a
really fast compile), and they all start up their compilation.  The 
result
is a
bunch of blocked distcc tcp connects to machines with long tcp 
"listen"
queues,
and ultimately, very slow compiles...
Easy.  Give up on the idea of having fast and slow machines in the 
cluster.
Toss out all the slow ones.  Treat all the remaining machines as 
identical.
Randomization then does the trick for you.
- Dan


            
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