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| author | dillon <dillon@FreeBSD.org> | 2003-01-13 19:42:41 +0000 |
|---|---|---|
| committer | dillon <dillon@FreeBSD.org> | 2003-01-13 19:42:41 +0000 |
| commit | 5b697ad7ba32cd4546d0a6a44b4ef2a58cc6f9e9 (patch) | |
| tree | af69e0b4486eed6e705fe04be584e57921195acb /sbin/dump/dump.h | |
| parent | d0082e294ce62cf63d5aa4738b8f999e18b04fff (diff) | |
| download | FreeBSD-src-5b697ad7ba32cd4546d0a6a44b4ef2a58cc6f9e9.zip FreeBSD-src-5b697ad7ba32cd4546d0a6a44b4ef2a58cc6f9e9.tar.gz | |
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
Diffstat (limited to 'sbin/dump/dump.h')
| -rw-r--r-- | sbin/dump/dump.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/sbin/dump/dump.h b/sbin/dump/dump.h index eb04b0c..feb5913 100644 --- a/sbin/dump/dump.h +++ b/sbin/dump/dump.h @@ -77,6 +77,7 @@ long asize; /* number of 0.1" units written on current tape */ int etapes; /* estimated number of tapes */ int nonodump; /* if set, do not honor UF_NODUMP user flags */ int unlimited; /* if set, write to end of medium */ +int cachesize; /* size of block cache in bytes */ int notify; /* notify operator flag */ int blockswritten; /* number of blocks written on current tape */ |
