John Dyson b68a757139 Significant performance improvement for mmap'ed files. This commit ... makes MADV_SEQUENTIAL much more effective. I suggest that we start using MADV_SEQUENTIAL on system utilities that mmap their input files, and the I/O is predominantely sequential. Below is a test with 'cmp' on two relatively large binary files, where the files are so large that the caching is ineffective: + ls -l t1.xxx t2.xxx -rw-r--r-- 1 root wheel 65598384 Dec 10 12:13 t1.xxx -rw-r--r-- 1 root wheel 65598384 Dec 10 12:14 t2.xxx + time cmp t1.xxx t2.xxx 3.78user 0.70system 1:33.43elapsed 4%CPU + time cmpmadv t1.xxx t2.xxx 4.21user 1.05system 0:30.93elapsed 17%CPU This change is as a result of an observation made by BDE.		1996-12-11 05:17:23 +00:00
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ffs	Submitted by: Archie and me.	1996-11-13 01:45:56 +00:00
lfs	Whoops, I should've used the LINT config file. More ts -> tv changes	1996-09-20 05:56:36 +00:00
mfs	struct mfsnode bloated in size by 12 bytes, so reduce spare padding by 3 longs.	1996-11-04 20:53:02 +00:00
ufs	Significant performance improvement for mmap'ed files. This commit	1996-12-11 05:17:23 +00:00