Trial run of JackRabbit-M

Now that I have run through the 32 bit windows portion of the benchmark for the customer, I want to compare to our default way of shipping the units. So I fired up our default CF load, rebuilt the RAID. Simple little test runs, nothing to see here (no tuning yet)


The really simple minded tests … how quickly can we pull from the disk and the buffer cache.

root@jrs8:~/mdadm-2.6.6# hdparm  -tT /dev/md0

/dev/md0:
 Timing cached reads:   8862 MB in  2.00 seconds = 4436.59 MB/sec
 Timing buffered disk reads:  3038 MB in  3.01 seconds = <strong>1007.76 MB/sec</strong>

Now lets write 336 GB.

root@jrs8:/big# dd if=/dev/zero of=/big/big_file bs=32M count=10000 oflag=direct
10000+0 records in
10000+0 records out
335544320000 bytes (336 GB) copied, 281.305 seconds, <strong>1.2 GB/s</strong>

and read it back

root@jrs8:/big# dd if=/big/big_file of=/dev/null bs=32M  iflag=direct
10000+0 records in
10000+0 records out
335544320000 bytes (336 GB) copied, 245.411 seconds, <strong>1.4 GB/s</strong>
root@jrs8:/big# 

Yeah, it really is a 336 GB file

root@jrs8:~# ls -alF /big
total 327680004
drwxr-xr-x  2 root root           21 2008-06-22 16:43 ./
drwxr-xr-x 22 root root         4096 2008-03-12 16:29 ../
-rw-r--r--  1 root root <strong>335544320000</strong> 2008-06-22 16:48 big_file

More tuning to do, will report back later on. First we have a benchmark to set up …

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