1 #!/usr/bin/sh 2 # 3 # iosnoop - A program to print disk I/O events as they happen, with useful 4 # details such as UID, PID, filename, command, etc. 5 # Written using DTrace (Solaris 10 3/05). 6 # 7 # This is measuring disk events that have made it past system caches. 8 # 9 # $Id: iosnoop,v 1.1.1.1 2015/09/30 22:01:07 christos Exp $ 10 # 11 # USAGE: iosnoop [-a|-A|-DeghiNostv] [-d device] [-f filename] 12 # [-m mount_point] [-n name] [-p PID] 13 # 14 # iosnoop # default output 15 # 16 # -a # print all data (mostly) 17 # -A # dump all data, space delimited 18 # -D # print time delta, us (elapsed) 19 # -e # print device name 20 # -g # print command arguments 21 # -i # print device instance 22 # -N # print major and minor numbers 23 # -o # print disk delta time, us 24 # -s # print start time, us 25 # -t # print completion time, us 26 # -v # print completion time, string 27 # -d device # instance name to snoop (eg, dad0) 28 # -f filename # full pathname of file to snoop 29 # -m mount_point # this FS only (will skip raw events) 30 # -n name # this process name only 31 # -p PID # this PID only 32 # eg, 33 # iosnoop -v # human readable timestamps 34 # iosnoop -N # print major and minor numbers 35 # iosnoop -m / # snoop events on the root filesystem only 36 # 37 # FIELDS: 38 # UID user ID 39 # PID process ID 40 # PPID parennt process ID 41 # COMM command name for the process 42 # ARGS argument listing for the process 43 # SIZE size of operation, bytes 44 # BLOCK disk block for the operation (location) 45 # STIME timestamp for the disk request, us 46 # TIME timestamp for the disk completion, us 47 # DELTA elapsed time from request to completion, us 48 # DTIME time for disk to complete request, us 49 # STRTIME timestamp for the disk completion, string 50 # DEVICE device name 51 # INS device instance number 52 # D direction, Read or Write 53 # MOUNT mount point 54 # FILE filename (basename) for io operation 55 # 56 # NOTE: 57 # - There are two different delta times reported. -D prints the 58 # elapsed time from the disk request (strategy) to the disk completion 59 # (iodone); -o prints the time for the disk to complete that event 60 # since it's last event (time between iodones), or, the time to the 61 # strategy if the disk had been idle. 62 # - When filtering on PID or process name, be aware that poor disk event 63 # times may be due to events that have been filtered away, for example 64 # another process that may be seeking the disk heads elsewhere. 65 # 66 # SEE ALSO: BigAdmin: DTrace, http://www.sun.com/bigadmin/content/dtrace 67 # Solaris Dynamic Tracing Guide, http://docs.sun.com 68 # DTrace Tools, http://www.brendangregg.com/dtrace.html 69 # 70 # COPYRIGHT: Copyright (c) 2005 Brendan Gregg. 71 # 72 # CDDL HEADER START 73 # 74 # The contents of this file are subject to the terms of the 75 # Common Development and Distribution License, Version 1.0 only 76 # (the "License"). You may not use this file except in compliance 77 # with the License. 78 # 79 # You can obtain a copy of the license at Docs/cddl1.txt 80 # or http://www.opensolaris.org/os/licensing. 81 # See the License for the specific language governing permissions 82 # and limitations under the License. 83 # 84 # CDDL HEADER END 85 # 86 # Author: Brendan Gregg [Sydney, Australia] 87 # 88 # 12-Mar-2004 Brendan Gregg Created this, build 51. 89 # 23-May-2004 " " Fixed mntpt bug. 90 # 10-Oct-2004 " " Rewritten to use the io provider, build 63. 91 # 04-Jan-2005 " " Wrapped in sh to provide options. 92 # 08-May-2005 " " Rewritten for perfromance. 93 # 15-Jul-2005 " " Improved DTIME calculation. 94 # 25-Jul-2005 " " Added -p, -n. Improved code. 95 # 17-Sep-2005 " " Increased switchrate. 96 # 17-Sep-2005 " " Last update. 97 # 98 99 100 ############################## 101 # --- Process Arguments --- 102 # 103 104 ### default variables 105 opt_dump=0; opt_device=0; opt_delta=0; opt_devname=0; opt_file=0; opt_args=0; 106 opt_mount=0; opt_start=0 opt_end=0; opt_endstr=0; opt_ins=0; opt_nums=0 107 opt_dtime=0; filter=0; device=.; filename=.; mount=.; pname=.; pid=0 108 opt_name=0; opt_pid=0 109 110 ### process options 111 while getopts aAd:Def:ghim:Nn:op:stv name 112 do 113 case $name in 114 a) opt_devname=1; opt_args=1; opt_endstr=1; opt_nums=1 ;; 115 A) opt_dump=1 ;; 116 d) opt_device=1; device=$OPTARG ;; 117 D) opt_delta=1 ;; 118 e) opt_devname=1 ;; 119 f) opt_file=1; filename=$OPTARG ;; 120 g) opt_args=1 ;; 121 i) opt_ins=1 ;; 122 N) opt_nums=1 ;; 123 n) opt_name=1; pname=$OPTARG ;; 124 o) opt_dtime=1 ;; 125 p) opt_pid=1; pid=$OPTARG ;; 126 m) opt_mount=1; mount=$OPTARG ;; 127 s) opt_start=1 ;; 128 t) opt_end=1 ;; 129 v) opt_endstr=1 ;; 130 h|?) cat <<-END >&2 131 USAGE: iosnoop [-a|-A|-DeghiNostv] [-d device] [-f filename] 132 [-m mount_point] [-n name] [-p PID] 133 iosnoop # default output 134 -a # print all data (mostly) 135 -A # dump all data, space delimited 136 -D # print time delta, us (elapsed) 137 -e # print device name 138 -g # print command arguments 139 -i # print device instance 140 -N # print major and minor numbers 141 -o # print disk delta time, us 142 -s # print start time, us 143 -t # print completion time, us 144 -v # print completion time, string 145 -d device # instance name to snoop 146 -f filename # snoop this file only 147 -m mount_point # this FS only 148 -n name # this process name only 149 -p PID # this PID only 150 eg, 151 iosnoop -v # human readable timestamps 152 iosnoop -N # print major and minor numbers 153 iosnoop -m / # snoop events on filesystem / only 154 END 155 exit 1 156 esac 157 done 158 159 ### option logic 160 if [ $opt_dump -eq 1 ]; then 161 opt_delta=0; opt_devname=0; opt_args=2; opt_start=0; 162 opt_end=0; opt_endstr=0; opt_nums=0; opt_ins=0; opt_dtime=0 163 fi 164 if [ $opt_device -eq 1 -o $opt_file -eq 1 -o $opt_mount -eq 1 -o \ 165 $opt_name -eq 1 -o $opt_pid -eq 1 ]; then 166 filter=1 167 fi 168 169 170 ################################# 171 # --- Main Program, DTrace --- 172 # 173 /usr/sbin/dtrace -n ' 174 /* 175 * Command line arguments 176 */ 177 inline int OPT_dump = '$opt_dump'; 178 inline int OPT_device = '$opt_device'; 179 inline int OPT_delta = '$opt_delta'; 180 inline int OPT_devname = '$opt_devname'; 181 inline int OPT_file = '$opt_file'; 182 inline int OPT_args = '$opt_args'; 183 inline int OPT_ins = '$opt_ins'; 184 inline int OPT_nums = '$opt_nums'; 185 inline int OPT_dtime = '$opt_dtime'; 186 inline int OPT_mount = '$opt_mount'; 187 inline int OPT_start = '$opt_start'; 188 inline int OPT_pid = '$opt_pid'; 189 inline int OPT_name = '$opt_name'; 190 inline int OPT_end = '$opt_end'; 191 inline int OPT_endstr = '$opt_endstr'; 192 inline int FILTER = '$filter'; 193 inline int PID = '$pid'; 194 inline string DEVICE = "'$device'"; 195 inline string FILENAME = "'$filename'"; 196 inline string MOUNT = "'$mount'"; 197 inline string NAME = "'$pname'"; 198 199 #pragma D option quiet 200 #pragma D option switchrate=10hz 201 202 /* 203 * Print header 204 */ 205 dtrace:::BEGIN 206 { 207 last_event[""] = 0; 208 209 /* print optional headers */ 210 OPT_start ? printf("%-14s ","STIME") : 1; 211 OPT_end ? printf("%-14s ","TIME") : 1; 212 OPT_endstr ? printf("%-20s ","STRTIME") : 1; 213 OPT_devname ? printf("%-7s ","DEVICE") : 1; 214 OPT_ins ? printf("%-3s ","INS") : 1; 215 OPT_nums ? printf("%-3s %-3s ","MAJ","MIN") : 1; 216 OPT_delta ? printf("%-10s ","DELTA") : 1; 217 OPT_dtime ? printf("%-10s ","DTIME") : 1; 218 219 /* print main headers */ 220 OPT_dump ? 221 printf("%s %s %s %s %s %s %s %s %s %s %s %s %s %s %s %s %s %s\n", 222 "TIME", "STIME", "DELTA", "DEVICE", "INS", "MAJ", "MIN", "UID", 223 "PID", "PPID", "D", "BLOCK", "SIZE", "MOUNT", "FILE", "PATH", 224 "COMM","ARGS") : 225 printf("%5s %5s %1s %8s %6s ", "UID", "PID", "D", "BLOCK", "SIZE"); 226 OPT_args == 0 ? printf("%10s %s\n", "COMM", "PATHNAME") : 1; 227 OPT_args == 1 ? printf("%28s %s\n", "PATHNAME", "ARGS") : 1; 228 } 229 230 /* 231 * Check event is being traced 232 */ 233 io:genunix::start 234 { 235 /* default is to trace unless filtering, */ 236 self->ok = FILTER ? 0 : 1; 237 238 /* check each filter, */ 239 (OPT_device == 1 && DEVICE == args[1]->dev_statname)? self->ok = 1 : 1; 240 (OPT_file == 1 && FILENAME == args[2]->fi_pathname) ? self->ok = 1 : 1; 241 (OPT_mount == 1 && MOUNT == args[2]->fi_mount) ? self->ok = 1 : 1; 242 (OPT_name == 1 && NAME == execname) ? self->ok = 1 : 1; 243 (OPT_pid == 1 && PID == pid) ? self->ok = 1 : 1; 244 } 245 246 /* 247 * Reset last_event for disk idle -> start 248 * this prevents idle time being counted as disk time. 249 */ 250 io:genunix::start 251 /! pending[args[1]->dev_statname]/ 252 { 253 /* save last disk event */ 254 last_event[args[1]->dev_statname] = timestamp; 255 } 256 257 /* 258 * Store entry details 259 */ 260 io:genunix::start 261 /self->ok/ 262 { 263 /* these are used as a unique disk event key, */ 264 this->dev = args[0]->b_edev; 265 this->blk = args[0]->b_blkno; 266 267 /* save disk event details, */ 268 start_uid[this->dev, this->blk] = uid; 269 start_pid[this->dev, this->blk] = pid; 270 start_ppid[this->dev, this->blk] = ppid; 271 start_args[this->dev, this->blk] = (char *)curpsinfo->pr_psargs; 272 start_comm[this->dev, this->blk] = execname; 273 start_time[this->dev, this->blk] = timestamp; 274 275 /* increase disk event pending count */ 276 pending[args[1]->dev_statname]++; 277 278 self->ok = 0; 279 } 280 281 /* 282 * Process and Print completion 283 */ 284 io:genunix::done 285 /start_time[args[0]->b_edev, args[0]->b_blkno]/ 286 { 287 /* decrease disk event pending count */ 288 pending[args[1]->dev_statname]--; 289 290 /* 291 * Process details 292 */ 293 294 /* fetch entry values */ 295 this->dev = args[0]->b_edev; 296 this->blk = args[0]->b_blkno; 297 this->suid = start_uid[this->dev, this->blk]; 298 this->spid = start_pid[this->dev, this->blk]; 299 this->sppid = start_ppid[this->dev, this->blk]; 300 self->sargs = (int)start_args[this->dev, this->blk] == 0 ? 301 "" : start_args[this->dev, this->blk]; 302 self->scomm = start_comm[this->dev, this->blk]; 303 this->stime = start_time[this->dev, this->blk]; 304 this->etime = timestamp; /* endtime */ 305 this->delta = this->etime - this->stime; 306 this->dtime = last_event[args[1]->dev_statname] == 0 ? 0 : 307 timestamp - last_event[args[1]->dev_statname]; 308 309 /* memory cleanup */ 310 start_uid[this->dev, this->blk] = 0; 311 start_pid[this->dev, this->blk] = 0; 312 start_ppid[this->dev, this->blk] = 0; 313 start_args[this->dev, this->blk] = 0; 314 start_time[this->dev, this->blk] = 0; 315 start_comm[this->dev, this->blk] = 0; 316 start_rw[this->dev, this->blk] = 0; 317 318 /* 319 * Print details 320 */ 321 322 /* print optional fields */ 323 OPT_start ? printf("%-14d ", this->stime/1000) : 1; 324 OPT_end ? printf("%-14d ", this->etime/1000) : 1; 325 OPT_endstr ? printf("%-20Y ", walltimestamp) : 1; 326 OPT_devname ? printf("%-7s ", args[1]->dev_statname) : 1; 327 OPT_ins ? printf("%3d ", args[1]->dev_instance) : 1; 328 OPT_nums ? printf("%3d %3d ", 329 args[1]->dev_major, args[1]->dev_minor) : 1; 330 OPT_delta ? printf("%-10d ", this->delta/1000) : 1; 331 OPT_dtime ? printf("%-10d ", this->dtime/1000) : 1; 332 333 /* print main fields */ 334 OPT_dump ? 335 printf("%d %d %d %s %d %d %d %d %d %d %s %d %d %s %s %s %s %S\n", 336 this->etime/1000, this->stime/1000, this->delta/1000, 337 args[1]->dev_statname, args[1]->dev_instance, args[1]->dev_major, 338 args[1]->dev_minor, this->suid, this->spid, this->sppid, 339 args[0]->b_flags & B_READ ? "R" : "W", 340 args[0]->b_blkno, args[0]->b_bcount, args[2]->fi_mount, 341 args[2]->fi_name, args[2]->fi_pathname, self->scomm, self->sargs) : 342 printf("%5d %5d %1s %8d %6d ", 343 this->suid, this->spid, args[0]->b_flags & B_READ ? "R" : "W", 344 args[0]->b_blkno, args[0]->b_bcount); 345 OPT_args == 0 ? printf("%10s %s\n", self->scomm, args[2]->fi_pathname) 346 : 1; 347 OPT_args == 1 ? printf("%28s %S\n", 348 args[2]->fi_pathname, self->sargs) : 1; 349 350 /* save last disk event */ 351 last_event[args[1]->dev_statname] = timestamp; 352 353 /* cleanup */ 354 self->scomm = 0; 355 self->sargs = 0; 356 } 357 358 /* 359 * Prevent pending from underflowing 360 * this can happen if this program is started during disk events. 361 */ 362 io:genunix::done 363 /pending[args[1]->dev_statname] < 0/ 364 { 365 pending[args[1]->dev_statname] = 0; 366 } 367 ' 368
Indexes created Mon Apr 20 00:23:12 UTC 2026