Bug 5533 – Nexus patch to fix improper use of MPI

Bug 5533 - Nexus patch to fix improper use of MPI

Summary:

Nexus patch to fix improper use of MPI

Status:	RESOLVED FIXED

Product:	Toolkit Internals
Component:	Nexus
Version:	unspecified
Platform:	All All

Importance:	P3 normal
Target Milestone:	---
Assigned To:	John Bresnahan

URL:	http://
Keywords:

Depends on:
Blocks:
	Show dependency tree / graph

Reported:	2007-09-04 14:32 by Brian R. Toonen
Modified:	2007-09-06 12:41 (History)

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Description From Brian R. Toonen 2007-09-04 14:32:44

Some implementations of MPI are not thread safe or only allow calls to MPI
routines from the main thread.  Other implementations may allow the use of
threads, but require that the caller insure that no two MPI routines are called
at the same time.  While Nexus insures that it does not simultaneously call MPI
functions from two different threads, it cannot make that guarantee with
respect to other independent modules and itself.

The attached patch disables the use of the MPI protocol module for threaded
flavors in order to guarantee that Nexus will not call MPI routines from any
thread other than the main thread.  Without this patch, applications that use
MPI and a threaded flavor of Globus frequently fail if Nexus is activated, as
is the case when DUROC (pre-WS) is used to start the job.

------- Comment #1 From Brian R. Toonen 2007-09-04 14:34:51 -------

It would appear that I adding attachments has been disabled.  I will send the
patch via email.

------- Comment #2 From John Bresnahan 2007-09-06 11:32:13 -------

Any patch from brain toonen has to be good :-).  I'll commit this today.

------- Comment #3 From Brian R. Toonen 2007-09-06 12:41:53 -------

Would it be possible to release this patch as an update package and add it to
the Globus Toolkit Advisories web page?