Changeset: f9527ac5535b for MonetDB
URL: https://dev.monetdb.org/hg/MonetDB/rev/f9527ac5535b
Modified Files:
gdk/gdk_bbp.c
Branch: Dec2023
Log Message:
Quicker check to see if trim may need to do anything.
diffs (53 lines):
diff --git a/gdk/gdk_bbp.c b/gdk/gdk_bbp.c
--- a/gdk/gdk_bbp.c
+++ b/gdk/gdk_bbp.c
@@ -1721,27 +1721,21 @@ BBPtrim(bool aggressive, bat nbat)
int n = 0;
int waitctr = 0;
bool changed = false;
- bool locked = false;
unsigned flag = BBPUNLOADING | BBPSYNCING | BBPSAVING;
if (!aggressive)
flag |= BBPHOT;
lng t0 = GDKusec();
for (bat bid = 1; bid < nbat && !GDKexiting(); bid++) {
+ /* quick check to see if we might possibly have to do
+ * work (includes free bats) */
+ if ((BBP_status(bid) & BBPLOADED) == 0)
+ continue;
/* don't do this during a (sub)commit */
- if (!locked) {
- BBPtmlock();
- locked = true;
- }
+ BBPtmlock();
MT_lock_set(&GDKswapLock(bid));
BAT *b = NULL;
bool swap = false;
- unsigned status = BBP_status(bid);
- if (status == 0) {
- /* quickly skip free bats */
- MT_lock_unset(&GDKswapLock(bid));
- continue;
- }
- if (!(status & flag) &&
+ if (!(BBP_status(bid) & flag) &&
BBP_refs(bid) == 0 &&
BBP_lrefs(bid) != 0 &&
(b = BBP_cache(bid)) != NULL) {
@@ -1765,15 +1759,12 @@ BBPtrim(bool aggressive, bat nbat)
changed = true;
}
BBPtmunlock();
- locked = false;
/* every once in a while, give others a chance */
if (++waitctr >= 1000) {
waitctr = 0;
MT_sleep_ms(2);
}
}
- if (locked)
- BBPtmunlock();
if (n > 0)
TRC_INFO(BAT_, "unloaded %d bats in "LLFMT" usec%s\n", n,
GDKusec() - t0, aggressive ? " (also hot)" : "");
return changed;
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