PCMark 8 was originally introduced in 2013 and the storage test uses only one thread to do everything. We are by no means living in the single-core era thanks to corporations like AMD offering CPUs with higher core counts than ever before. PCMark 10 Storage uses all the CPU cores available on the platform being tested and has been validated to support up to 5GB/s bandwidth. About half the available cores/threads are being used for generating the data needed for I/O and the other half are tasked with sending out I/Os. The I/O in both PCMark 8 and PCMark 10 is asynchronous. That means that the thread sending an I/O does not sit waiting for it to complete, but can instead queue more I/O to match the queue depth in the recorded trace. The CPU thread count used by the benchmark does not equal to the queue depth seen by the storage device. Most modern software has been written to be a muilthreaded solution where it can push IOs from multiple threads. This should play top the strengths of NVMe devices that have come out in recent years as they were designed to handle multiple queues at the same time. So, the take home message here is that PCMark 10 takes advantage of all available threads and uses newer real-world traces.
The first test that we will be running is the PCMark 10 Full System Drive Benchmark. This benchmark uses a wide-ranging set of real-world traces from popular applications and common tasks to fully test the performance of the fastest modern drives. The goal of the benchmark is to show meaningful real-world performance differences between fast storage technologies such as SATA, NVMe, and Intel’s Optane. The Full System Drive Benchmark uses 23 traces, running 3 passes with each trace. Some of the traces include booting Windows 10 and start times for games titles Battlefield V, Call of Duty Black Ops 4, and Overwatch. It typically takes an hour to run and the number of bytes written to the drive during test with default settings is 204 GB.
On the full system drive benchmark the results show the Sabrent Rocekt Q 8TB drive finished with an overall score of 1,280. This puts it down near the bottom of the pack on this tough application is said to be one of the best real-world benchmarks around.
The PCMark 10 Storage Benchmarks overall score is calculated from the bandwidth and average access time sub-scores. The bandwidth subtest is defined by UL in PCMark 10 as bandwidth = bytes / busy_time_for_read_and_write. Here the Sabrent Rocket Q 8TB comes in with a score of 209.5 MB/s on the bandwidth test.
The final subtest result is the average access time. During a trace playback in PCMark 10, the start and end time is measured for each I/O. So, the average access time is derived from the end time of an I/O subtracted from the start time of that operation. The Sabrent Rocket Q 8TB drive had an average access time of 134 microseconds.
The second and final test that we will be running is the PCMark 10 Quick System Drive Benchmark. The Quick System Drive Benchmark is a shorter test with a smaller set of less demanding real-world traces. This benchmark is better suited for testing entry performance level and lower capacity drives in less demanding use scenarios. The benchmark is designed to measure the performance of small system drives from traditional spinning drives (HDDs) at the low end and entry-level PCI Express SSDs at the high end. The Quick System Drive Benchmark uses 6 traces, running 3 passes with each trace. Three of the traces involve copying JPEG images and the other three use Microsoft Excel, Adobe Illustrator, and Adobe Photoshop. It typically takes 20 minutes to run and the number of bytes written to the drive during test with default settings is 23 GB.
On this lighter workload the Sabrent Rocket Q 8TB actually performed a bit better and moved up to the middle of the pack with an overall score of 2,332.
In the PCMark 10 quick storage drive benchmark bandwidth test the Rocket Q 8TB scored 285.4 MB/s.
The average access time on the Sabrent Rocket Q 8TB was 55 microseconds.