Re: [Ganglia-developers] Ganglia and Scyld

[Wade H. <wad...@ns...>]

More info on my problems.  

There appears to be an initialization problem.  I can get gmond
to crash on my head node as easily as on a slave node.   Often it
crashes in lib/inetaddr.c : g_inetaddr_new() calling strdup(name).
The problem seems to be with memory allocation.

I compiled with dmalloc and got gmond to fail with an error
about recursive mallocs.  Something is writing on the
malloc memory area, I think.

I can also get gmond to fail if I try to connect to it while
it is initilializing. This causes one thread to have a
segmentation violation.

Also, the results of barrier_init are not checked in gmond.c.
If the program receives a signal, this can result in interrupted
system calls and barrier_init failing, but the code thinking
all is ok.  I suspect there are some other places or there is
an initialization problem.  Should the initialization code start
a thread then wait for a semaphore before starting the next?

BTW, all my testing is on a dual 2G XEON box with
hyperthreads enabled (appears as 4 CPUS, hence 4 simultaneous
threads could be running).

After all this, I finally got gmond to work on my slave node
(sometimes).

1)  compile with -ldmalloc (add to LIBS line in Makefile)
2)  compile options -ggdb and remove the -O options
3)  manually copy /usr/lib/dmalloc.o
4)  copy the /etc/gmond.conf file to the node
5)  bpsh 0 ./gmond

Of course, I have debug set to 100 so I'm getting LOTS of
output.....  

Any help would be appreciated.
--
Wade Hampton