Increase MPI_REDUCE_BLOCKSIZE 100 fold. Improves NeXus output

willend · willend · commit f30e837ba8dc · 2024-12-20T09:50:23.000+01:00
stability in massively parallel (&gt;500 core) scenarios.
diff --git a/common/lib/share/mccode-r.h.in b/common/lib/share/mccode-r.h.in
@@ -376,7 +376,7 @@ void destroy_darr3d(DArray3d a);
 }
 
 #ifndef MPI_REDUCE_BLOCKSIZE
-#define MPI_REDUCE_BLOCKSIZE 1000
+#define MPI_REDUCE_BLOCKSIZE 100000
 #endif
 
 int mc_MPI_Sum(double* buf, long count);

Original file line number	Diff line number	Diff line change
`@@ -376,7 +376,7 @@ void destroy_darr3d(DArray3d a);`
`376`	`376`	`}`
`377`	`377`
`378`	`378`	`#ifndef MPI_REDUCE_BLOCKSIZE`
`379`		`-#define MPI_REDUCE_BLOCKSIZE 1000`
	`379`	`+#define MPI_REDUCE_BLOCKSIZE 100000`
`380`	`380`	`#endif`
`381`	`381`
`382`	`382`	`int mc_MPI_Sum(double* buf, long count);`