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<A NAME="PetscSharedTmp"><H1>PetscSharedTmp</H1></A>
Determines if all processors in a communicator share a /tmp or have different ones.
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
int PetscSharedTmp(MPI_Comm comm,PetscTruth *shared)
</PRE>
Collective on MPI_Comm
<P>
<H3><FONT COLOR="#CC3333">Input Parameters</FONT></H3>
<DT><B><A HREF="../Sys/comm.html#comm">comm</A> </B> -MPI_Communicator that may share /tmp
<br>
<P>
<H3><FONT COLOR="#CC3333">Output Parameters</FONT></H3>
<DT><B>shared </B> -PETSC_TRUE or PETSC_FALSE
<br>
<P>
<H3><FONT COLOR="#CC3333">Options Database Keys</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-shared_tmp </B></TD><TD>- . -not_shared_tmp
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-tmp tmpdir</B></TD><TD>-
Environmental Variables:
+ PETSC_SHARED_TMP
</TD></TR></TABLE>
<DT><B>PETSC_NOT_SHARED_TMP</B> -- PETSC_TMP
<br>
<P>
<P>
<H3><FONT COLOR="#CC3333">Notes</FONT></H3>
Stores the status as a MPI attribute so it does not have
to be redetermined each time.
<P>
Assumes that all processors in a communicator either
1) have a common /tmp or
2) each has a seperate /tmp
eventually we can write a fancier one that determines which processors
share a common /tmp.
<P>
This will be very slow on runs with a large number of processors since
it requires O(p*p) file opens.
<P>
If the environmental variable PETSC_TMP is set it will use this directory
as the "/tmp" directory.
<P>
<P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>developer
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/sys/src/fileio/fretrieve.c.html#PetscSharedTmp">src/sys/src/fileio/fretrieve.c</A>
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