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| H A D | cache.c | 109187 Mon Jan 13 17:42:41 MST 2003 dillon 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 |
| H A D | Makefile | diff 109187 Mon Jan 13 17:42:41 MST 2003 dillon 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 |
| H A D | dump.h | diff 109187 Mon Jan 13 17:42:41 MST 2003 dillon 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 |
| H A D | dump.8 | diff 109187 Mon Jan 13 17:42:41 MST 2003 dillon 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 |
| H A D | main.c | diff 109187 Mon Jan 13 17:42:41 MST 2003 dillon 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 |
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