Re: Erratic behavior of TclBC in parallel

From: Jérôme Hénin (jhenin_at_ifr88.cnrs-mrs.fr)
Date: Fri Jan 22 2010 - 11:08:02 CST

Hi everyone,
Just to add to my previous message: the problem doesn't seem to be
happen when running over MPI a version built on the following charm++
arch:
mpi-linux-amd64-mpt-iccstatic
Jerome

2010/1/21 Jérôme Hénin <jhenin_at_ifr88.cnrs-mrs.fr>:
> Hi everyone,
>
> I am seeing random errors from the Tcl interpreter(s) when running
> TclBC in parallel.
>
> Using the current CVS version of NAMD, on Linux-x86_64-g++ (gcc
> 4.4.1), charm++ 6.1.2 (arch: multicore-linux64). The Tcl8.3 static lib
> is the x86_64 build provided on the NAMD website.
>
> When running on one node, things work as expected. In parallel though
> (on any number of cores from a dual 4-core box), I get erratic errors
> such as:
>
> FATAL ERROR: unknown math function "/"
>    while compiling
> "expr {$F * $x / $r}"
>
> or
>
> Tcl_Release couldn't find reference for 0x2a66310
> Aborted
>
> or
>
> FATAL ERROR: can't use empty string as operand of "*"
>    while executing
> "expr {$x*$x + $y*$y}"
>
> where x and y are local variables in proc calcforces.
>
> This seems to point to a seriously messed up Tcl interpreter. Did
> anyone notice anything of the sort? I'll gladly provide anyone willing
> to try with a small test case.
>
> Thanks,
> Jerome
>
>

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