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- DiskPerf 2 By: Khalid Aldoseri
- ---------- -------------------
-
- This is an updated version of the original DiskPerf by Rick Spanbauer. The
- purpose of this program is to give you a fairly accurate idea of how
- fast a particular controller/hard disk combination is.
-
- To use the program just run it from CLI. It will then start giving you
- performance figures on the current drive. (To test any other drive, just
- 'DPerf2 YourDriveName:') You will get the following data:
-
-
- Create Files: This is the number of files your drive can create in 1 second.
- Delete Files: Same as above, but for deleting files.
-
- Directory Scan: This is the speed of directory scanning in entries per second.
- Seek/Read Test: This is a test of how fast your drive heads move.
-
-
- Read/Write Speed Tests:
- These figures are how fast your drive can read/write data. The test is
- performed with 6 different buffer sizes. You should see dramatic difference
- as the buffer size increases, especially with the Fast Filing System.
-
-
- Note: the number of buffers a device has will greatly affect its diskperf
- figures. These are not very realistic increases and you should run DPref2
- with as few buffers as possible. (between 5 - 30 buffers)
-
- The following is a sample output from my hard disk:
- (Controller: CBM 2090, Hard Disk: Conner CP3100 100Meg SCSI)
-
- DiskPerf2. Testing FAST0:
-
- Create Files: 19 files/sec. Directory Scan: 236 entries/sec.
- Delete Files: 53 files/sec. Seek/Read Test: 159 seek/sec.
-
- Read/Write Speed Test: (bytes/sec.)
-
- Buffer: 512 Read: 70,223 Write: 18,978
- Buffer: 4k Read: 181,289 Write: 149,540
- Buffer: 8k Read: 302,706 Write: 237,019
- Buffer: 32k Read: 511,001 Write: 333,516
- Buffer: 64k Read: 624,152 Write: 389,515
- Buffer: 256k Read: 655,360 Write: 418,760
-
-
- If you get diskperf figure close to these, then your setup is very fast.
- Normal figures range around 300k read and 200k write for FFS.
-
-
- 25 Feb 1989.
-
- Khalid Aldoseri.
- CIS 75166,2531.
-
-
-
- This program is placed in the Public Domain. You can do whatever you want
- with it. The original version of the program was done by Rick Spanbauer.
-
-
- Differences between Diskperf and DPerf2:
-
- - Bug Fixes:
- 1. DPref2 now doesn't leave any locks lying around and will delete the
- test directory before it exits.
- 2. DiskPerf didn't close the timer device before it exits. This is fixed.
-
- - Program optimized in order to speed up its execution. This means that
- almost all of the time is spend in reading/writing data and not in DPerf2.
-
- - Timing measurement resolution has been increased. This makes the figures
- for read/write tests much more accurate.
-
- - Output has been improved a lot.
-
- - Added two more tests in the read/write test.
-
- - Read/Write test with a 512 byte buffer has been shortened to be 4 times
- quicker. This barely affects accuracy but speeds up the tests greatly.
-
- - All in all, the figures by DPref2 can be compard to figures from DiskPerf
- as the difference is around +/- 10% at most.
-
- Notes:
-
- There are many things that can affect the diskperf performance of your
- system, including: controller, hard disk, driver software, processor speed,
- drive interleave, etc. etc. With DPref2 you can experiment with these
- and see what gives you the best performance.
-