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 I/O in both PCMark 8 and PCMark 10 is asynchronous. 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. 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. 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 8 was originally introduced in 2013 and the storage test uses only one thread to do everything.
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