This is partly a fix for tickets #222 and #449, although both
of those still need work from RobL.

Reviewed by robl@.

No reviewer.

These make testing for ref counting bugs easier.

No reviewer.

that directory in the executed command. Right now, either version should
work, but the newer model is better when we do hierarchical proxies. As
a side-effect, we do not have to use sh within ssh anymore, since we
have a single command executed now.

case of an abnormal exit, so that the runaway processes can be cleaned
up properly (based on the PID, instead of the executable name).

Algorithm: Each proxy keeps track of the PIDs of the processes it
launches and listens on a socket for incoming connections from the job
launcher. If the exit is clean, this socket is not used at all. However,
if the job launcher wants to kill the application (due to a timeout,
or an abort by another process in the application), a connection is
established on this socket and a message sent to the proxy to kill its
corresponding processes. We only support one command right now (KILLALL).

This should resolve ticket #447.

mpiexec to continuously poll.

[svn-r4016] We don't support the HYDRA_USE_LOCALHOST option anymore. If nothing is given, this setting is assumed.

See ticket #438 for more info.  This reverts commit r3960.

No reviewer.

on comm_self, now that the standard explicitly states when attributes on
COMM_SELF are to be freed (early in MPI_FINALIZE).  Addresses two of the three
parts of #222 (initialization code in MPI-IO)

bootstrap server specific (e.g., fork will not need this invocation,
but ssh does).

as the program causing the value to be overwritten. Moved all macros
that declare variables as functions as a good programming practice.

[svn-r4002] Added back the code to wrap around host files when the number of nodes is lesser than needed.

This change removes the MPIR_Allreduces that were added to MPI_Init time as part
of the SMP collectives work.  It also brings the number of MPI_Allreduces on
each communicator creation back down to 1 instead of 3.  It does this by shaving
2 bits from the context ID to indicate parent, intranode, or internode.

This change also removes one of the context suffix (also called offset) bits
from context IDs, for a final number of 1 bit.

The net change in the context ID space after this change is a reduction by a
factor of 2 (1 bit).

Reviewed by buntinas@.

[svn-r4000] Move -f to a global option that affects all local executables. The code was following this, but the help message was incorrect.

[svn-r3998] Squashing several compile warnings in Hydra. Also made the demux engine independent of the central Hydra handle so it can be used by the proxy more cleanly.

utilities to a hydra_utils.h header. These do not depend on any other
part of the code and can be used in any process/function.

be changed. We no longer have auto-incrementing and static variables. The
program logic takes care of assigning the right values for the variables.

eventually called. This will help us improve it in the future from
one location.

stdin. Also, the interface between the proxy and the boot-strap server
is broken; so a proxy has no way to launch more proxies. Thus, only a
one-level hierarchy of proxies is supported right now.

No reviewer.