At 04:31 AM 1/30/2008, Kris Kennaway wrote:
Claus Guttesen wrote:
I forgot to mention in my first post that I'm using ULE. The p800
controller has a (factory set) 25/75 read/write cache ratio.
There's maybe one additional thing: do you dual-boot Linux and FreeBSD?
If so, you'll need to set up a separate additional partition for the
database, instead of benchmarking it with the file systems used by the
OS, because different areas of the drive(s) have different performance -
you can verify this with diskinfo -t.
I installed FreeBSD onto a boot-partition (p400i-controller) and used
the external storage (p800) as database-partition (eight 15K rpm
sas-disks in raid 1+0). Same with Ubuntu. When I re-installed FreeBSD
and ubuntu I wiped and formatted the previous partitions. Ubuntu used
ext3 which I guess is default fs.
Write performance is something that we are working on, expect to
hear about progress over the coming weeks/months.
I tried both ronly and read write, and using a very large table on
RELENG_7, AMD64, ULE, 8G of RAM, Xeon 3060 dual core
sysbench --pgsql-host="" --test=oltp --pgsql-user=pgsql
--oltp-table-size=29400000 prepare
run=3
clients=40
for a in 2 8 16 32
do
for ((b=1; b<=$run; b++))
do
echo loop $b of clients $a
/usr/local/pgsql/bin/psql -d sbtest -U pgsql -c "vacuum analyse;"
sysbench --test=oltp --oltp-read-only --num-threads=${a}
--pgsql-user=pgsql --pgsql-host="" --max-time=300
--max-requests=10000 --oltp-table-size=29400000 run >>
sysbench-clients-linux-ronly-mike-${a}
done
done
This created ~ an 8G table. The database was on a dedicated Areca
RAID10 array and the OS was on a separate disk (IDE). The results are
pretty similar. At least for me, they are close enough. For my
customer, its a lot of reading from a 18G database and not too many
writes. Looking at how his app typically runs against FreeBSD and
Fedora, there was very little difference as well.
For the ronly test the FreeBSD values were all pretty tight, but for
the 2 client one, the initial run for Fedora really was
crappy. After that, they had pretty similar distributions. The
values below are averages for 3 runs and an average for 5 on the rw
tests that had smaller table sizes (--oltp-table-size=1900000)
Threads FreeBSD Fedora 8
2 1213
(1219.07,1210.66,1211.44) 674 (128.18,746.81,1266.14)
8 1155 1406
16 1118 1358
32 1069 1192
On the RW tests,
Threads FreeBSD Fedora 8
2 404 491
8 222 366
16 198 349
32 162 265
This was also without too much tweaking of the FreeBSD side.
kern.ipc.shmall=532768
kern.ipc.shmmax=134217728
kern.ipc.semmap=256
shared_buffers = 24MB
max_fsm_pages = 153600
update_process_title = off
---Mike
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