hIOmon SSD Performance Monitor - Understanding desktop usage patterns.

[overthere]

I can see how the hIOmon metrics collected by Ao1 during his AS SSD benchmark run (with only the "Access Time" option selected) can appear puzzling.

I will try to briefly explain what hIOmon observed (as shown in the screenshots provided by Ao1 and Anvil within their prior posts above).

I'll start with the "write" I/O operations (since they are more straightforward). BTW, I ran the same "Access Time option only" with version 1.6.4067.34354 of AS SSD earlier today and monitored the run with hIOmon to further confirm these findings:

1. The "writes" begin by the "AS SSD Benchmark.exe" process sequentially writing out a 1GiB file named "test.bin" that resides within a folder called "AS-SSD-TEST42".
   
   To write/create this test file, this AS SSD process issues 64 separate write I/O operations, with each of these write I/O operations having a data transfer length of 16,777,216 bytes.
   
   These numbers all coincide with those shown within the second "write" table in Ao1's screenshot above (more specifically, the first entry within this table). Please note that the hIOmon software considers the first write I/O operation to be neither a random nor a sequential I/O operation; hence the value of "1,056,964,608" shown within the "WriteSeqAccessDataXfer" column (i.e., 16,777,216 multiplied by 63).
   
   
2. The AS SSD process then performs a single write I/O operation (to the "test.bin" file) with a data transfer length of 4,096 bytes, which matches the value shown within the "Write Xfer Max Size" column for the 5th entry within the "write" metrics table.
   
   
3. The AS SSD process then performs 26,214 random write I/O operations (to the same "test.bin" file) with a data transfer length of 512 bytes, which is the same as shown within Anvil's screenshot above. (Please note that the "Write Xfer Min Size" column is not shown, but would have the value of 512).
   
   These 26,214 random write I/O operations are shown within the "Write Random Access IOP Count" column, with the resulting data transfer amount shown in the "WriteRandomAccessDataXfer" column, which is equal to 512 multiplied by 26,214 (which, of course, is 13,421,568).
   
   So the random data transfer total (13,421,568 bytes) combined with the initial 4,096 bytes of data written equals the 13,425,664 shown within the respective "Write Data Xfer" column.

Before I tackle the "read" I/O operations (which probably are much more puzzling) I have a question to ask Ao1:

Are you perchance running Microsoft Security Essentials (MSE) upon your system?