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 had the Samsung SSD 980 Pro 1TB SSD finishing with an overall score of 2578 points and that is good enough for a second place finish! Only the Intel Optane 905P 960GB drive managed to do better.
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 Samsung SSD 980 PRO 1TB NVMe SSD averaged 405.7 MB/s and the 500GB drive averaged 361.5 MB/s.
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 Samsung SSD 980 Pro 1TB and 500GB drive had an average access time of 64 and 73 microseconds, respectively.
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 Samsung SSD 980 Pro drives were the third and fourth fastest drives that we have come across on this workload.
In the PCMark 10 quick storage drive benchmark bandwidth test the SSD 980 PRO 1TB came in at 352.9 MB/s and the SSD 980 PRO 500GB finished at 336.0 MB/s.
The average access time on the Samsung SSD 980 Pro was around 43-45 microseconds and that is really good for the quick system drive benchmark workload.