MonetDB: default - Pre-allocate the first section of the BBP.

[Sjoerd Mullender via checkin-list]

Changeset: 9aa0797dc3ce for MonetDB
URL: https://dev.monetdb.org/hg/MonetDB/rev/9aa0797dc3ce
Modified Files:
        gdk/gdk_bbp.c
Branch: default
Log Message:

Pre-allocate the first section of the BBP.


diffs (43 lines):

diff --git a/gdk/gdk_bbp.c b/gdk/gdk_bbp.c
--- a/gdk/gdk_bbp.c
+++ b/gdk/gdk_bbp.c
@@ -101,8 +101,9 @@
  * are found in O(1) by keeping a freelist that uses the 'next' field
  * in the BBPrec records.
  */
-BBPrec *BBP[N_BBPINIT];                /* fixed base VM address of BBP array */
-bat BBPlimit = 0;              /* current committed VM BBP array */
+static BBPrec BBP0[BBPINIT];
+BBPrec *BBP[N_BBPINIT] = {[0] = BBP0}; /* fixed base VM address of BBP array */
+bat BBPlimit = BBPINIT;                /* current committed VM BBP array */
 static ATOMIC_TYPE BBPsize = ATOMIC_VAR_INIT(0); /* current used size of BBP 
array */
 
 struct BBPfarm_t BBPfarms[MAXFARMS];
@@ -1951,8 +1952,10 @@ BBPinit(bool allow_hge_upgrade)
        }
 
        /* scan the BBP.dir to obtain current size */
-       BBPlimit = 0;
+       BBPlimit = BBPINIT;
+       memset(BBP0, 0, sizeof(BBP0));
        memset(BBP, 0, sizeof(BBP));
+       BBP[0] = BBP0;
 
        bat bbpsize;
        bbpsize = 1;
@@ -4685,13 +4688,14 @@ gdk_bbp_reset(void)
        int i;
 
        BBP_free = 0;
-       while (BBPlimit > 0) {
+       while (BBPlimit > BBPINIT) {
                BBPlimit -= BBPINIT;
                assert(BBPlimit >= 0);
                GDKfree(BBP[BBPlimit >> BBPINITLOG]);
                BBP[BBPlimit >> BBPINITLOG] = NULL;
        }
        ATOMIC_SET(&BBPsize, 0);
+       memset(BBP0, 0, sizeof(BBP0));
        for (i = 0; i < MAXFARMS; i++)
                GDKfree((void *) BBPfarms[i].dirname); /* loose "const" */
        memset(BBPfarms, 0, sizeof(BBPfarms));
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