Re: [9fans] venti /plan9port mmapped

[wb.kloke@gmail.com]

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I have committed the changes to make the mmapped venti server fully functional to 
https://github.com/vestein463/plan9port/tree/master/src/cmd/venti/mappedsrv

This is not fully tested yet, esp. for more than 1 arenapartition.

I include data on the read performance vs. the previous traditional-io version.
The mmapped version is on amd64/32GB freebsd, the traditional on WD mycloud Ex2 (arm7/1G).
The arena partition resides on the mycloud, and is served via nfs readonly to the amd.
I repeated the test to see what effect the os caching of the 2 machines may have.
1st is the mmapped version, 2nd the traditional, 3rd mmapped again and 4th traditional.

The data is the image of an old ufs filesystem created by vbackup.
time venti=wbk1 vcat ffs:f10fb5797e5ea50d6bc567772f9794706548f568 > /dev/null
1540096 blocks total
582848 blocks in use, 2122946 file reads

real    6m53,762s
user    1m13,788s
sys     0m16,910s
[wb@wbk1 ~/plan9port/src/cmd/venti/mappedsrv]$ time venti=wdmc vcat ffs:f10fb5797e5ea50d6bc567772f9794706548f568 > /dev/null
1540096 blocks total
582848 blocks in use, 2122946 file reads

real    17m28,870s
user    1m26,011s
sys     0m42,485s
[wb@wbk1 ~/plan9port/src/cmd/venti/mappedsrv]$ time venti=wbk1 vcat ffs:f10fb5797e5ea50d6bc567772f9794706548f568 > /dev/null
1540096 blocks total
582848 blocks in use, 2122946 file reads

real    3m55,614s
user    1m9,911s
sys     0m14,804s
[wb@wbk1 ~/plan9port/src/cmd/venti/mappedsrv]$ time venti=wdmc vcat ffs:f10fb5797e5ea50d6bc567772f9794706548f568 > /dev/null
1540096 blocks total
582848 blocks in use, 2122946 file reads

real    16m41,033s
user    1m15,768s
sys     0m32,756s


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