preallocate buffer in IOUtil_GetAllParameters(), to prevent too many subsequent

reallocs which may cause unnecessary memory fragmentation


git-svn-id: http://svn.cactuscode.org/arrangements/CactusBase/IOUtil/trunk@261 b32723a9-ab3a-4a60-88e2-2e5d99d7c17a

1 files changed, 9 insertions, 2 deletions

diff --git a/src/CheckpointRecovery.c b/src/CheckpointRecovery.c
index 5d79672..838891d 100644
--- a/src/CheckpointRecovery.c
+++ b/src/CheckpointRecovery.c
@@ -786,9 +786,16 @@ char *IOUtil_GetAllParameters (const cGH *GH, int all)
   /* avoid compiler warning about unused parameter */
   GH = GH;
 
-  retval = NULL;
+  /* preallocate buffer for parameters, to prevent too many subsequent reallocs
+     (causing unnecessary memory fragmentation) */
+  max_len = 1024*1024;
+  retval = malloc(max_len);
+  if (! retval)
+  {
+    CCTK_VWarn (0, __LINE__, __FILE__, CCTK_THORNSTRING,
+                "Failed to allocate buffer of %d bytes", max_len);
+  }
   current_len = 0;
-  max_len = 1;
 
   /* loop over all thorns */
   for (i = CCTK_NumCompiledThorns () - 1; i >= 0; i--)