1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
|
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML3.2 EN">
<HTML>
<HEAD> <link rel="canonical" href="http://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/Sys/PetscBuildTwoSidedType.html" />
<META NAME="GENERATOR" CONTENT="DOCTEXT">
<TITLE>PetscBuildTwoSidedType</TITLE>
</HEAD>
<BODY BGCOLOR="FFFFFF">
<div id="version" align=right><b>petsc-3.14.5 2021-03-03</b></div>
<div id="bugreport" align=right><a href="mailto:petsc-maint@mcs.anl.gov?subject=Typo or Error in Documentation &body=Please describe the typo or error in the documentation: petsc-3.14.5 v3.14.5 docs/manualpages/Sys/PetscBuildTwoSidedType.html "><small>Report Typos and Errors</small></a></div>
<A NAME="PetscBuildTwoSidedType"><H1>PetscBuildTwoSidedType</H1></A>
algorithm for setting up two-sided communication
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
typedef enum {
<A HREF="../Sys/PetscBuildTwoSidedType.html#PetscBuildTwoSidedType">PETSC_BUILDTWOSIDED_NOTSET</A> = -1,
<A HREF="../Sys/PetscBuildTwoSidedType.html#PetscBuildTwoSidedType">PETSC_BUILDTWOSIDED_ALLREDUCE</A> = 0,
<A HREF="../Sys/PetscBuildTwoSidedType.html#PetscBuildTwoSidedType">PETSC_BUILDTWOSIDED_IBARRIER</A> = 1,
<A HREF="../Sys/PetscBuildTwoSidedType.html#PetscBuildTwoSidedType">PETSC_BUILDTWOSIDED_REDSCATTER</A> = 2
/* Updates here must be accompanied by updates in finclude/petscsys.h and the string array in mpits.c */
} <A HREF="../Sys/PetscBuildTwoSidedType.html#PetscBuildTwoSidedType">PetscBuildTwoSidedType</A>;
</PRE>
<pre>
<A HREF="../Sys/PetscBuildTwoSidedType.html#PetscBuildTwoSidedType">PETSC_BUILDTWOSIDED_ALLREDUCE</A> - classical algorithm using an MPI_Allreduce with
</pre>
<pre>
a buffer of length equal to the communicator size. Not memory-scalable due to
</pre>
<pre>
the large reduction size. Requires only MPI-1.
</pre>
<pre>
<A HREF="../Sys/PetscBuildTwoSidedType.html#PetscBuildTwoSidedType">PETSC_BUILDTWOSIDED_IBARRIER</A> - nonblocking algorithm based on MPI_Issend and MPI_Ibarrier.
</pre>
<pre>
Proved communication-optimal in Hoefler, Siebert, and Lumsdaine (2010). Requires MPI-3.
</pre>
<pre>
<A HREF="../Sys/PetscBuildTwoSidedType.html#PetscBuildTwoSidedType">PETSC_BUILDTWOSIDED_REDSCATTER</A> - similar to above, but use more optimized function
</pre>
<pre>
that only communicates the part of the reduction that is necessary. Requires MPI-2.
</pre>
<P>
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../Sys/PetscCommBuildTwoSided.html#PetscCommBuildTwoSided">PetscCommBuildTwoSided</A>(), <A HREF="../Sys/PetscCommBuildTwoSidedSetType.html#PetscCommBuildTwoSidedSetType">PetscCommBuildTwoSidedSetType</A>(), <A HREF="../Sys/PetscCommBuildTwoSidedGetType.html#PetscCommBuildTwoSidedGetType">PetscCommBuildTwoSidedGetType</A>()
<BR><P><B></B><H3><FONT COLOR="#CC3333">Level</FONT></H3>developer<BR>
<H3><FONT COLOR="#CC3333">Location</FONT></H3>
</B><A HREF="../../../include/petscsystypes.h.html#PetscBuildTwoSidedType">include/petscsystypes.h</A>
<BR><A HREF="./index.html">Index of all Sys routines</A>
<BR><A HREF="../../index.html">Table of Contents for all manual pages</A>
<BR><A HREF="../singleindex.html">Index of all manual pages</A>
</BODY></HTML>
|
