1. About FLOPs FLOPs (Floating Point Operations Per Second) refers to the number of floating-point operations performed per second. Specifically: A single floating-point addition, such as a + b, counts as one floating-point operation. A single floating-point multiplication, such as a * b, also counts as one floating-point operation. Other basic floating-point operations, such as division and square root, can also be counted as one floating-point operation.

1. Why Migrate Metadata Storage from Redis to PGSQL PGSQL is cheaper Redis stores metadata in memory, while PGSQL stores metadata on disk, so the cost difference is obvious. PGSQL performance is tunable Different PGSQL services offer different performance IOPS. If you do not have a continuously high performance requirement, PGSQL is a good choice.

1. Checking the CPU Check the CPU model 1 lscpu Check the instruction set 1 cat /proc/cpuinfo | grep -iE "flags|instruction set" 2. Checking Memory Memory usage and size 1 free -h Memory module model 1 dmidecode -t memory 3. Checking Disks Check disk mounts 1 lsblk -o NAME,TYPE,SIZE,MODEL,UUID,MOUNTPOINT Check disk usage 1 df -H | grep -vE '^Filesystem|tmpfs|cdrom|loop|udev' | awk '{ print $5 "/" $2 " " $1 }' |grep " "/ Check disk speed 1 hdparm -t /dev/sda3 Check disk temperature and more 1 apt install smartmontools 1 (for disk in /dev/sd?

1. Using Memory as a Storage Medium The image above is the storage pyramid, showing the relationship between the price of a storage medium and its speed. Today, enterprises widely adopt tape and disks as storage media mainly because of their price advantage. Market prices are driven by supply and demand: even for an expensive storage medium, if the production cost is low, the market is large enough, and the yield rate in the production process is high, its market price will come down.

1. About JuiceFS Caching On a host, warmed cache is placed directly on the host. In a cluster, there are two levels of cache: Worker, which provides cache shared at the cluster level Fuse, which provides cache at the current node level only 2. Warming Data with the JuiceFS Client Note that warming at the Fuse layer is only effective for the current node; if you need to warm the whole cluster, you must warm at the Worker layer.