Therefore, testing the random read and write performance of 4K is helpful for us to understand the read and write performance of SSD and the stability of performance. Our SSD is also written sequentially when it is used for the first time, but the longer they use and the larger the capacity, its writes will become more scattered. Random reading and writing, wide range and scattered. So what are continuous read-write performance and random read-write performance? Continuous read-write performance is the performance of reading and writing sequentially, while random read-write performance is the performance of random reads in a range. Therefore, it is necessary to test the performance of 4K.īut the source of what we often call “4K performance” is AS SSD Benchmark, in a narrow sense, but it is actually 4K random read and writes performance, which represents the data throughput capacity of the hard disk (measured in IOPS), and relative to continuous read and writes performance). The performance of 4K also shows the read and write performance of SSD. 4K performance includes 4K random and continuous read and writes performance. In view of this, the data we write is made up of countless 4Ks. For example, if we need to write 2K of data, we actually have to write 4K if we need to write 13K of data, we have to write 16K of data (write magnification is not considered here). In SSD, 4K is the smallest read and write unit SSD. The rookie with higher skills is to look at 4K and 4K-64Thrd here, looking at the so-called “4K performance” to judge whether SSD is good or bad. Most rookies look at the continuous reading and writing speed during the test. Something like your test score in school. That is, the data access time test, which reads the entire address range randomly with 4KB as the unit size, (LBA), with 512B as the write unit size, randomly writes within the reserved 1GB address range, and finally gives the test results with average scores. The test file will be deleted immediately after the test is completed. Random 64 queue depth test, the software will generate 64 16MB size test files (total 1GB), then write and read these 64 files in the unit size of 4KB at the same time, and finally take the average score as the result to generate the data write the amount of 2GB. Due to the generation steps, this test will generate a total of 2GB of data written to the hard disk, and the files will be temporarily retained after the test. The test software generates the 1GB size test file with a unit size of 512KB and then carries on the random 4KB unit size write and read test within its address range (LBA) until it runs through this range, and finally calculates the average score to give the result. The test file will be deleted immediately after the test. Let’s first take a look at the specific meaning of several test projects of AS SSD Benchmark.ĪS SSD will continue to write to the tested partition in terms of the size of 16MB, generate a file that reaches the size of 1GB, then read the file with the same unit size, and finally calculate the average score and give the result. AS SSD Benchmark is the software commonly used by many of us to measure the speed of SSD.īut many of us just look at the test data but do not understand the meaning of each test project, let alone the reading, writing, and application of SSD, which leads to some misunderstandings.
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