This instructs the kernel that it can release memory used by mmap'd
TSM files when they are not actively being used. It the mappings are
use, the kernel will fault the pages back in. On linux, this causes
RES memory to drop immediately when run.
Added mmap implementation for Windows. It uses MapViewOfFile similar to Bolt's implementation. MapViewOfFile returns a pointer and not a byte array. Bolt changed their data structure to support it.
Instead of changing the implementation of tsm data structure, I used a trick shown in https://groups.google.com/forum/#!topic/golang-nuts/g0nLwQI9www to use SliceHeader to convert the pointer into a slice.
Bolt's implementation also closes the file handle in mmap itself. It was resulting in a timeout, so implemented https://github.com/edsrzf/mmap-go/blob/master/mmap_windows.go logic to keep file handle open until munmap
Added mmap implementation for Windows. It uses MapViewOfFile similar to Bolt's implementation. MapViewOfFile returns a pointer and not a byte array. Bolt changed their data structure to support it.
Instead of changing the implementation of tsm data structure, I used a trick shown in https://groups.google.com/forum/#!topic/golang-nuts/g0nLwQI9www to use SliceHeader to convert the pointer into a slice.
Added mmap implementation for Windows based on MapViewOfFile. Used SliceHeader trick to change the pointer returned by MapViewOfFile to a byte slice. This will not call for any change in rest of tsm.
However I am not sure where this mmap function is called, as go build is still complains about
tsdb\engine\tsm1\tsm1.go:1974: undefined: syscall.Mmap
tsdb\engine\tsm1\tsm1.go:1974: undefined: syscall.PROT_READ
tsdb\engine\tsm1\tsm1.go:1974: undefined: syscall.MAP_SHARED
tsdb\engine\tsm1\tsm1.go:2033: undefined: syscall.Munmap
Stuart Carnie
Mark Rushakoff
Edd Robinson
Ben Johnson
Jason Wilder
runner
Ady
Adarsha