Hi,
I tested and changed segsize=0.25GB which is max partitioned table file size and
default setting is 1GB in configure option (./configure --with-segsize=0.25).
Because I thought that small segsize is good for fsync phase and background disk
write in OS in checkpoint. I got significant improvements in DBT-2 result!
* Performance result in DBT-2 (WH340)
| NOTPM 90%tile Average Maximum
-----------------------------+---------------------------------------
original_0.7 (baseline) | 3474.62 18.348328 5.739 36.977713
fsync + write | 3586.85 14.459486 4.960 27.266958
fsync + write + segsize=0.25 | 3661.17 8.28816 4.117 17.23191
Changing segsize with my checkpoint patches improved original over 50% at
90%tile
and maximum response time.
However, this tests ware not same condition... I also changed SESSION parameter
100 to 300 in DBT-2 driver. In general, I heard good SESSION parameter is 100.
Andt I didn't understand optimized DBT-2 parameters a lot. So I will retry to
test my patches and baseline with optimized parameters in DBT-2. Please wait for
a while.
Best regards,
--
Mitsumasa KONDO
NTT Open Source Software Center
diff --git a/configure b/configure
index 7c662c3..6269cb9 100755
--- a/configure
+++ b/configure
@@ -2879,7 +2879,7 @@ $as_echo "$as_me: error: Invalid block size. Allowed values are 1,2,4,8,16,32."
esac
{ $as_echo "$as_me:$LINENO: result: ${blocksize}kB" >&5
$as_echo "${blocksize}kB" >&6; }
-
+echo ${blocksize}
cat >>confdefs.h <<_ACEOF
#define BLCKSZ ${BLCKSZ}
@@ -2917,14 +2917,15 @@ else
segsize=1
fi
-
# this expression is set up to avoid unnecessary integer overflow
# blocksize is already guaranteed to be a factor of 1024
-RELSEG_SIZE=`expr '(' 1024 / ${blocksize} ')' '*' ${segsize} '*' 1024`
-test $? -eq 0 || exit 1
+#RELSEG_SIZE=`expr '(' 1024 / ${blocksize} ')' '*' ${segsize} '*' 1024`
+RELSEG_SIZE=`echo 1024/$blocksize*$segsize*1024 | bc`
+#test $? -eq} 0 || exit 1
{ $as_echo "$as_me:$LINENO: result: ${segsize}GB" >&5
$as_echo "${segsize}GB" >&6; }
-
+echo ${segsize}
+echo ${RELSEG_SIZE}
cat >>confdefs.h <<_ACEOF
#define RELSEG_SIZE ${RELSEG_SIZE}
--
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