Hello,
I've run into an application that has its performance dramatically
affected by some configuration options to the underlying UCX library.
Is there a way to configure/build Open MPI so that which UCX library
is used is determined at runtime (e.g. by an environment module),
rather than having t
ng which can be resolved another way.
>
> --Yossi
>
> -Original Message-
> From: devel On Behalf Of Tim Mattox via
> devel
> Sent: Sunday, 24 January 2021 23:18
> To: devel@lists.open-mpi.org
> Cc: Tim Mattox
> Subject: [OMPI devel] How to build Open MPI so the
ific
> > location
> > For example: mpirun -x
> > LD_PRELOAD=:::
> > ...
> >
> > BTW, what is different about the other UCX configuration? Maybe this is
> > something which can be resolved another way.
> >
> > --Yossi
> >
> > ---
PM Yossi Itigin wrote:
> > >
> > > Hi,
> > >
> > > One option is to use LD_PRELOAD to load all ucx libraries from a specific
> > > location
> > > For example: mpirun -x
> > > LD_PRELOAD=:::
> > > ...
> > >
> >
gt; > dramatic performance hit for one application (so far).
> > > I've already tested that everything works fine if I replace UCX's .so
> > > files manually in the filesystem, and the "new/changed" ones get
> > > loaded, but a user can't make t
; > --enable-params-check --prefix=/same/install/prefix/ucx/1.9.0/debug
> > > > tuned version: --disable-logging --disable-debug --disable-assertions
> > > > --disable-params-check --prefix=/same/install/prefix/ucx/1.9.0/tuned
> > > >
> > > &g
swap ucx/1.9.0/tuned
ucx/1.9.0/debug" when they want to enable debugging at the UCX layer.
On Sun, Jan 24, 2021 at 4:43 PM Yossi Itigin wrote:
Hi,
One option is to use LD_PRELOAD to load all ucx libraries from a specific
location
For example: mpirun -x
LD_PRELOAD=:::
...
BTW, what is differ
On Jan 27, 2021, at 2:00 AM, Gilles Gouaillardet via devel
mailto:devel@lists.open-mpi.org>> wrote:
Tim,
a simple option is to
configure ... LDFLAGS="-Wl,--enable-new-dtags"
If Open MPI is built with this option, then LD_LIBRARY_PATH takes precedence
over rpath
(the default is the opposite
Thank you for the suggestion of 'configure ...
LDFLAGS="-Wl,--enable-new-dtags"'.
I'm still reading up on its meaning, but wouldn't that change the
behavior across all dependencies that are dynamically linked when I
build Open MPI?
I was specifically wanting *just* these UCX .so files to be
dynami
Jeff,
What I meant is the default Linux behavior is to first lookup
dependencies in the rpath, and then fallback to LD_LIBRARY_PATH
*unless* -Wl,--enable-new-dtags was used at link time.
In the case of Open MPI, -Wl,--enable-new-dtags is added to the MPI
wrappers,
but Open MPI is *not* b
On Jan 27, 2021, at 7:19 PM, Gilles Gouaillardet wrote:
>
> What I meant is the default Linux behavior is to first lookup dependencies in
> the rpath, and then fallback to LD_LIBRARY_PATH
> *unless* -Wl,--enable-new-dtags was used at link time.
>
> In the case of Open MPI, -Wl,--enable-new-dtag
On Mon, 1 Feb 2021 14:46:22 +
"Jeff Squyres \(jsquyres\) via devel" wrote:
> On Jan 27, 2021, at 7:19 PM, Gilles Gouaillardet
> wrote:
> >
> > What I meant is the default Linux behavior is to first lookup
> > dependencies in the rpath, and then fallback to LD_LIBRARY_PATH
> > *unless* -Wl,-
FYI - I wasn’t bothered by the default behavior... I was just looking for a
sanctioned way for an installer (e.g. a sysadmin) to make the UCX be loaded
based on LD_LIBRARY_PATH so that there was an ability for the user to swap
in a debug build of UCX at runtime.
On Mon, Feb 1, 2021 at 10:14 AM Pe
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