Update of /cvsroot/monetdb/MonetDB/src/gdk
In directory sc8-pr-cvs16.sourceforge.net:/tmp/cvs-serv4965
Modified Files:
gdk_utils.mx
Log Message:
- lower the threshold for creation of mmap-backed heaps to 64MB
this gives the advantage that if those are made persistent later,
saving to disk is much cheaper. It makes the system also better
resistent against swapping.
For non-persistent bats, the performance difference should be small.
That does not hold for Windows, as it will effectively materialize
a full file on disk before the mmap can be done (Linux and other Unixes
just use a file with a hole whose creation is very cheap).
Therefore, we retain the 1/3 of RAM limit for Windows.
Index: gdk_utils.mx
===================================================================
RCS file: /cvsroot/monetdb/MonetDB/src/gdk/gdk_utils.mx,v
retrieving revision 1.200
retrieving revision 1.201
diff -u -d -r1.200 -r1.201
--- gdk_utils.mx 11 Dec 2007 12:49:46 -0000 1.200
+++ gdk_utils.mx 14 Dec 2007 13:18:50 -0000 1.201
@@ -1476,7 +1476,11 @@
/* Mserver intends to rob 80% of all memory as a default */
GDK_mem_maxsize = (size_t) ((double) MT_npages() * (double)
MT_pagesize() * 0.815);
+#ifdef WIN32
GDK_vm_minsize = (size_t) ((double) MT_npages() * (double)
MT_pagesize() * 0.33);
+#else
+ GDK_vm_minsize = 64*1024*1024;
+#endif
GDKmemchk(TRUE, TRUE);
GDKremovedir(DELDIR);
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