Well, essentially what I am trying to do is compare continuous write and random write on different media types.
I also did this to test writing with seeking to different positions first. 
#               foreach (1 .. 1024)
#               {
#                       syswrite(DEV, 'L' x 1024, 1024);
#               }
#               $MCounter++;
#               printf("\r %f MiB", $MCounter);
#               if ($MCounter >= 100)
#               {
#                       close(DEV);
#                       exit(0);
#               }
#               sysseek(DEV,(1024*1024*2), 1);
#               print("\nJumping 2mb\n");

[download]

This is giving me frustrating results as my cf card is 100x, my drive is sata, and my usb stick unknown speed.
Here are the results: 
Continuous write, 100 mb:
Image stored on a filesystem: 26.964s
100x CF Card: 36.572s
USB Stick: 1m28.938s
Disk Partition: 2.599s

Random write (write 1mb, skip 2mb, loop)
Image: 21.111s
CF: 49.917s
USB: 1m29.354s
Partition: 2.832s

[download]

As predicted the random write took longer... but my understanding was that for short random read/write operations flash media was supposed to be faster because of a hard drives slow seeking. Then again I am addressing a continuous 300mb section, just skiping 2mb each time, so I guess I should re-think this experiment to really jump around both directions....

In reply to Re^2: FILE IO, delay after finish. by exodist
in thread FILE IO, delay after finish. by exodist

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