Date: Mon, 13 Jan 2003 11:42:41 -0800 (PST) From: Matt Dillon <dillon@FreeBSD.org> To: cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org Subject: cvs commit: src/sbin/dump Makefile cache.c dump.8 dump.h main.c traverse.c Message-ID: <200301131942.h0DJgfbN010760@repoman.freebsd.org>
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dillon 2003/01/13 11:42:41 PST
Modified files:
sbin/dump Makefile dump.8 dump.h main.c traverse.c
Added files:
sbin/dump cache.c
Log:
Add a caching option to dump. Use -C. Note that NetBSD has a caching option
called -r but it takes 512 byte blocks instead of megabytes, and I felt a
megabytes specification would be far more useful so I did not use the same
option character.
This will *greatly* improve dump performance at the cost of possibly
missing filesystem changes that occur between passes, and does a fairly
good job making up for the loss of buffered block devices. Caching is disabled
by default to retain historical behavior.
In tests, dump performance improved by about 40% when dumping / or /usr.
Beware that dump forks and the cache may wind up being larger then you
specify, but a more complex shared memory implementation would not produce
results that are all that much better so I kept it simple for now.
MFC after: 3 days
Revision Changes Path
1.20 +1 -1 src/sbin/dump/Makefile
1.1 +151 -0 src/sbin/dump/cache.c (new)
1.54 +11 -0 src/sbin/dump/dump.8
1.22 +1 -0 src/sbin/dump/dump.h
1.44 +7 -2 src/sbin/dump/main.c
1.31 +4 -3 src/sbin/dump/traverse.c
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