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Most cheap microSD cards, even if rated as being 100MB/sec+ class 10 cards, can’t sustain anywhere near that rate when writing random data-especially on the Raspberry Pi’s measly data bus. I like the lower block size random I/O tests especially, because many operations (like logging data, writing a row to an ACID-compliant database, or bulk loading of data) require as fast of small-block-size random I/O as possible. Rationale: iozone is a very robust filesystem benchmark tool, which does a lot of useful tests that make sure you’re getting a broad overview of read and write performance for a variety of block sizes and situations. iozone 4K Random read/write iozone -e -I -a -s 100M -r 4k -i 0 -i 1 -i 2 50k 8k blocks ~= 400 MB, which shouldn’t be able to be cached on a microSD card in a Pi!. Because of that, make sure that count is set to a parameter large enough to cause the OS to actually write data to the drive (e.g. If your filesystem caches are big enough, this is a pretty poor disk speed comparison test. Rationale: dd simply copies data from one place ( if) to another ( of).
#Pny memory master 64gb review install
Install hdparm: sudo apt-get install -y hdparmĭd write sudo dd if= /dev/zero of= /home/pi /test bs=8k count=50k conv=fsync sudo rm -f /home /pi/test.raspberry-pi-dramble/master/setup/benchmarks/microsd-benchmarks.sh sudo bash.
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You could also test with -T instead of -t to test the OS filesystem cache performance (which allows the OS to dramatically speed up certain read operations), but for our purposes we just want to test the device itself. Samsung Evo Plus 64GB, 43.45 MB/s, 22.4 MB/s, 7.93 MB/s, 2.37 MB/s. Rationale: hdparm gives basic raw throughput stats for buffered reads (by the disk/device itself).
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Rasbperry Pi 2 model B Card Make/ModelĪll the benchmarks can be run quickly and easily by running a shell script in the Raspberry Pi Dramble repository: curl | sudo bash hdparm buffered sudo hdparm -t /dev/mmcblk0
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Card Make/Modelġ The Samsung Pro refused to overclock to 100 MHz I could only overclock at 80 MHz reliably.
#Pny memory master 64gb review how to
You can double the microSD card reader's speed by adding an extra dtoverlay configuration inside /boot/config.txt (for instructions, see How to overclock the microSD card reader in the Raspberry Pi 3). Rasbperry Pi 3 model B - overclocked microSD Rasbperry Pi 3 model B - overclocked microSD.Here are the results of those efforts, in a nice tabular format: Pi models testedĬlick on a Pi model to see microSD benchmarks run on that Pi. As an example, if you use a normal, cheap microSD card for your database server, normal database operations can literally be 100x slower than if you used a standard microSD card.īecause of this, I went and purchased over a dozen different cards and have been putting them through their paces. There is an order-of-magnitude difference between most cheap cards and the slightly-more-expensive ones (even if both are rated as being in the same class)-especially in small-block random I/O performance. In my experience, one of the highest-impact upgrades you can perform is to buy the fastest possible microSD card-especially for applications where you need to do a lot of random reads and writes.