Magic Smoke: A simple throughput test utility.

BASIC IDEA:
We want to test the throughput of the storage device.  So lets flood out the reads and writes as fast as we can.  However, some drives, especially physical disks (or those made by manufacturers who care more about statistics than real-world performance) have benefits if we try to do sequential read/writes.  So this throughput tester does randomized reads and writes.
	We read/write entire blocks 9On the block boundaries, of course) in order to best simulate how the OS will treat IO from a block device.


BUILDING:
$ make

Yeah, that simple =)

INSTALLATION:
Well, not quite.  I haven't built an install target in the makefile.  For now, if you want it available in a system-wide way, copy the executeable somewhere in your path. (# cp magicSmoke /usr/local/bin or so)

Sample usage:

$ ./magicSmoke -rwa 10000000 ~/testmagic

Beginning read cycle!
Done read cycle
Read statistics:
10000000 4096-byte blocks read in:
19.549999 seconds proc time
20.000000 real time
500000.000000 blocks/sec
2048000000.000000 B/sec
2000000.000000 KB/sec
1953.125000 MB/sec

Beginning write cycle!
Done write cycle
Write statistics:
10000000 4096-byte blocks read in:
35.230000 seconds proc time
35.000000 real time
285714.281250 blocks/sec
1170285696.000000 B/sec
1142857.125000 KB/sec
1116.071411 MB/sec


TODO: Convert this to use asynchronous IO (let the OS fetch things as fast as the kernel can manage)