Memory Slots: ECC: Disabled Upgradeable Memory: No BANK 0/ChannelA-DIMM0: Size: 32 GB Type: DDR4 Speed: 2667 MHz Status: OK Manufacturer: Micron Part Number: - Serial Number: - BANK 2/ChannelB-DIMM0: Size: 32 GB Type: DDR4 Speed: 2667 MHz Status: OK Manufacturer: Micron Part Number: - Serial Number: -
$ diskutil erasevolume HFS+ 'RAM_Disk' `hdiutil attach -nobrowse -nomount ram://67108864` Started erase on disk4 Unmounting disk Erasing Initialized /dev/rdisk4 as a 32 GB case-insensitive HFS Plus volume Mounting disk Finished erase on disk4 (RAM_Disk) $ dd if=/dev/random of=/Volumes/RAM_Disk/tmp.data bs=1024k count=16384 16384+0 records in 16384+0 records out 17179869184 bytes transferred in 54.670080 secs (314246279 bytes/sec) $ dd if=/Volumes/RAM_Disk/tmp.data of=/dev/null bs=1024k 16384+0 records in 16384+0 records out 17179869184 bytes transferred in 5.130549 secs (3348544052 bytes/sec) $ hdiutil detach /dev/disk4 "disk4" ejected.
Read speed: 3.1185 Gigabyte per second
Write speed: 299.6886 Megabyte per second
#dd