1 The following are demonstrations of the vopstat script. 2 3 4 By default, vopstat traces activity at the vnode interface and prints 5 summaries every five seconds. It will either trace all filesystems or 6 just the mountpoint specified. 7 8 Here it was run on /extra1, while a tar command archived /extra1, 9 10 # ./vopstat /extra1 11 VOP Physical IO Count 12 fop_getpage 66 13 14 VOP Count Count 15 fop_readdir 1 16 fop_read 2 17 fop_cmp 2 18 fop_seek 3 19 fop_close 7 20 fop_open 10 21 fop_getattr 12 22 fop_access 13 23 fop_lookup 16 24 fop_rwunlock 3802 25 fop_rwlock 3802 26 fop_putpage 4701 27 fop_getpage 6648 28 fop_dispose 19109 29 30 VOP Wall Time mSeconds 31 fop_readdir 0 32 fop_cmp 0 33 fop_read 0 34 fop_seek 0 35 fop_close 0 36 fop_open 0 37 fop_access 0 38 fop_getattr 0 39 fop_lookup 0 40 fop_rwunlock 64 41 fop_putpage 86 42 fop_rwlock 93 43 fop_dispose 346 44 fop_getpage 402 45 ^C 46 47 There were 66 calls for physical I/O operations, fop_getpage, as files 48 were read from disk. The VOP Count show that there were many calls to 49 fop_putpage and fop_getpage, as tar works its way through files; and 50 many more to fop_dispose. The total elaspsed time for these calls 51 are listed at the bottom, in milleseconds. 52 53 This rate of events will put some pressure on the DTrace buffer, 54 you may see dynamic variable drops. 55 56 57 58 vopstat also has a -t option to trace activity. Here it is run on /extra1 59 while an "ls" command listed files from that directory, 60 61 # ./vopstat -t /extra1 62 Event Device Path RW Size Offset 63 -> fop_getattr - /extra1 - 0 0 64 <- fop_getattr - /extra1 - 0 0 65 -> fop_access - /extra1 - 0 0 66 <- fop_access - /extra1 - 0 0 67 -> fop_open - /extra1 - 0 0 68 <- fop_open - /extra1 - 0 0 69 -> fop_getattr - /extra1 - 0 0 70 <- fop_getattr - /extra1 - 0 0 71 -> fop_rwlock - /extra1 - 0 0 72 <- fop_rwlock - /extra1 - 0 0 73 -> fop_readdir - /extra1 - 0 0 74 -> fop_getpage - /extra1 - 0 0 75 <- fop_getpage - /extra1 - 0 0 76 -> fop_rwunlock - /extra1 - 0 0 77 <- fop_rwunlock - /extra1 - 0 0 78 -> fop_rwlock - /extra1 - 0 0 79 <- fop_rwlock - /extra1 - 0 0 80 -> fop_readdir - /extra1 - 0 0 81 <- fop_readdir - /extra1 - 0 0 82 -> fop_rwunlock - /extra1 - 0 0 83 <- fop_rwunlock - /extra1 - 0 0 84 -> fop_close - /extra1 - 0 512 85 <- fop_close - /extra1 - 0 512 86 ^C 87 88 Each call can be seen as it happened, including the entry and return of 89 these calls. 90
Indexes created Fri Apr 24 00:22:58 UTC 2026