Bonnie++ vs D-Bench

Bonnie++ is a free, command-line benchmark suite for measuring filesystem and disk I/O performance on Linux. It exercises sequential input and output, rewrites, random seeks, and file operations including creation, stat, and deletion of many small files. The project describes these workloads as useful for investigating I/O bottlenecks in I/O-intensive applications, including database work, and for simulating file activity associated with Squid or INN. Bonnie++ can test more than 2 GB of storage on a 32-bit machine. Its -D option enables direct I/O for bulk tests, while -b calls fsync after each write and syncs the directory after file creation or deletion. Semaphore support can synchronize multiple instances. Results can be emitted as plain text or CSV, with companion tools to convert CSV into HTML or formatted plain text. The project is licensed under GPL version 2.0, and the repository includes source code and Debian, RPM, and Sun-related packaging files. Its documentation warns against running the benchmark on live production machines because it can affect services and consume disk space or inodes.

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.