D-Bench vs dperf

D-Bench is a free Windows utility for measuring read and write performance on SSDs, HDDs, NVMe drives, and USB storage. It reports throughput in MB/s, IOPS, and average latency, with read and write throughput separated. Workloads can be sequential or random, with configurable block size, queue depth, and thread count. HDD, SSD, and Flash Drive presets offer starting points; additional controls include access pattern, read/write mode, read percentage, duration, warm-up, and cool-down. The drive selector shows ready drives with letter, volume label, free space, and total capacity. Tests can be added, updated, removed, reordered, duplicated, or cleared. Results export to plain TXT or styled, self-contained HTML reports. D-Bench uses unbuffered I/O and disables operating-system read caching for write tests as much as possible. Downloads are offered in Default, Blue, and Red themes. One build supports Windows 8, 8.1, 10, and 11; another supports Vista and 7. The download is approximately 470 KB, and the utility has no command-line interface.

dperf is a Linux command-line utility for benchmarking drives to identify storage bottlenecks and performance outliers. It runs tests on multiple drives simultaneously and ranks them by throughput. Measurements use O_DIRECT to bypass the operating system page cache. Users can configure block size, file size, and concurrent I/O operations per drive. Results report read and write throughput, with verbose mode adding per-drive statistics alongside aggregate totals. The tool supports sequential tests, but not random I/O tests, IOPS measurement, or latency measurement. Its README describes deployment as Kubernetes Jobs, CronJobs, or DaemonSets for storage validation, as well as automated checks in CI/CD pipelines. Temporary space requirements are based on file size multiplied by I/O operations per drive for each drive. dperf requires Linux, a kernel and filesystem supporting direct I/O, and write access to target directories. Prebuilt binaries are listed for amd64, arm64, ppc64le, and s390x. It is free under the GNU Affero General Public License v3.0.