TESTA The number of simultaneous requests on a drive's request queue.
When an application requests data from a disk controller, the controller is responsible for fetching the data from the physical drive. Assuming there is just one request for data outstanding the controller will simply fetch the data and return it to the application. If a controller has multiple requests outstanding at any given time it is said to have a queue depth equal to the number of outstanding requests. When there are multiple requests outstanding a disk controller has the option of choosing the sequence in which to service them and it will attempt to optimize the order so as to achieve maximum data throughput. Requests for data blocks that reside "close" to each other on the physical drive will generally be serviced sequentially. Sophisticated algorithms increase data throughput rates by ordering pending requests optimally. Although typical user workloads demand a tiny proportion of their data at queue depths beyond four, heavily loaded database servers often see queue depths in the hundreds.
When an application requests data from a disk controller, the controller is responsible for fetching the data from the physical drive. Assuming there is just one request for data outstanding the controller will simply fetch the data and return it to the application. If a controller has multiple requests outstanding at any given time it is said to have a queue depth equal to the number of outstanding requests. When there are multiple requests outstanding a disk controller has the option of choosing the sequence in which to service them and it will attempt to optimize the order so as to achieve maximum data throughput. Requests for data blocks that reside "close" to each other on the physical drive will generally be serviced sequentially. Sophisticated algorithms increase data throughput rates by ordering pending requests optimally. Although typical user workloads demand a tiny proportion of their data at queue depths beyond four, heavily loaded database servers often see queue depths in the hundreds.
2019 Hardware Rankings
 PC Score |
PC Status |
|
|---|---|---|
| 1 sec agoIntel X99 | Nuclear submarine | 61% |
| 8 secs agoHP Compaq 8200 Elite SFF PC | Yacht | 56% |
| 11 secs agoMEG X299 CREATION (MS-7C06) | Tree trunk | 51% |
| 12 secs agoAsrock 970M Pro3 | Yacht | 75% |
| 18 secs agoGigabyte Z390 AORUS PRO WIFI | UFO | 45% |
| 18 secs agoStandard PC (i440FX + PIIX, ... | Tree trunk | 55% |
| 19 secs agobin bin | Tree trunk | 44% |
| 22 secs agoHP EliteBook 840 G2 | Jet ski | 53% |
| 22 secs agoTUF Gaming FX505DV_FX505DV | Aircraft carrier | 76% |
| 26 secs agoHP EliteBook 850 G3 | Yacht | 79% |
| 30 secs agoAsrock H310M-HDV | Battle cruiser | 34% |
| 38 secs agoB450I GAMING PLUS AC (MS-7A4... | Destroyer | 51% |
| 43 secs agoMSI B450 Tomahawk | Battleship | 44% |
| 46 secs agoAsus Z170-P | Battleship | 68% |
| 49 secs agoAsus PRIME Z370-P | UFO | 53% |
| 51 secs agoAsus ROG STRIX X470-F GAMING | UFO | 59% |
| 51 secs agoLenovo 36641S2 | Jet ski | 50% |
| 53 secs agoDell System XPS L321X | Raft | 54% |
| 55 secs agoHP 870-260na | Destroyer | 66% |
| 56 secs agoAcer Aspire M3970 | Speed boat | 32% |