performance_schema/table_io_waits_summary_by_table/table_io_waits_summary_by_table_row.go

   1 // This file contains the library routines for managing the
   2 // table_io_waits_by_table table.
   3 package table_io_waits_summary_by_table
   4
   5 import (
   6         "database/sql"
   7         "fmt"
   8         "log"
   9         "sort"
  10         "strings"
  11
  12         "github.com/sjmudd/pstop/lib"
  13 )
  14
  15 // a row from performance_schema.table_io_waits_summary_by_table
  16 type table_io_waits_summary_by_table_row struct {
  17         // Note: upper case names to match the performance_schema column names
  18         // This type is _not_ exported.
  19
  20         OBJECT_TYPE   string // in theory redundant but keep anyway
  21         OBJECT_SCHEMA string // in theory redundant but keep anyway
  22         OBJECT_NAME   string // in theory redundant but keep anyway
  23
  24         SUM_TIMER_WAIT   int
  25         SUM_TIMER_READ   int
  26         SUM_TIMER_WRITE  int
  27         SUM_TIMER_FETCH  int
  28         SUM_TIMER_INSERT int
  29         SUM_TIMER_UPDATE int
  30         SUM_TIMER_DELETE int
  31
  32         COUNT_STAR   int
  33         COUNT_READ   int
  34         COUNT_WRITE  int
  35         COUNT_FETCH  int
  36         COUNT_INSERT int
  37         COUNT_UPDATE int
  38         COUNT_DELETE int
  39 }
  40 type table_io_waits_summary_by_table_rows []table_io_waits_summary_by_table_row
  41
  42 // // return the table name from the columns as '<schema>.<table>'
  43 func (r *table_io_waits_summary_by_table_row) name() string {
  44         var n string
  45         if len(r.OBJECT_SCHEMA) > 0 {
  46                 n += r.OBJECT_SCHEMA
  47         }
  48         if len(n) > 0 {
  49                 if len(r.OBJECT_NAME) > 0 {
  50                         n += "." + r.OBJECT_NAME
  51                 }
  52         } else {
  53                 if len(r.OBJECT_NAME) > 0 {
  54                         n += r.OBJECT_NAME
  55                 }
  56         }
  57         return n
  58 }
  59
  60 func (r *table_io_waits_summary_by_table_row) pretty_name() string {
  61         s := r.name()
  62         if len(s) > 30 {
  63                 s = s[:29]
  64         }
  65         return fmt.Sprintf("%-30s", s)
  66 }
  67
  68 func (r *table_io_waits_summary_by_table_row) latency_headings() string {
  69         return fmt.Sprintf("%-30s %10s %6s|%6s %6s %6s %6s", "Table Name", "Latency", "%", "Fetch", "Insert", "Update", "Delete")
  70 }
  71 func (r *table_io_waits_summary_by_table_row) ops_headings() string {
  72         return fmt.Sprintf("%-30s %10s %6s|%6s %6s %6s %6s", "Table Name", "Ops", "%", "Fetch", "Insert", "Update", "Delete")
  73 }
  74
  75 // generate a printable result
  76 func (r *table_io_waits_summary_by_table_row) latency_row_content(totals table_io_waits_summary_by_table_row) string {
  77         // assume the data is empty so hide it.
  78         name := r.pretty_name()
  79         if r.COUNT_STAR == 0 {
  80                 name = ""
  81         }
  82
  83         return fmt.Sprintf("%-30s %10s %6s|%6s %6s %6s %6s",
  84                 name,
  85                 lib.FormatTime(r.SUM_TIMER_WAIT),
  86                 lib.FormatPct(lib.MyDivide(r.SUM_TIMER_WAIT, totals.SUM_TIMER_WAIT)),
  87                 lib.FormatPct(lib.MyDivide(r.SUM_TIMER_FETCH, r.SUM_TIMER_WAIT)),
  88                 lib.FormatPct(lib.MyDivide(r.SUM_TIMER_INSERT, r.SUM_TIMER_WAIT)),
  89                 lib.FormatPct(lib.MyDivide(r.SUM_TIMER_UPDATE, r.SUM_TIMER_WAIT)),
  90                 lib.FormatPct(lib.MyDivide(r.SUM_TIMER_DELETE, r.SUM_TIMER_WAIT)))
  91 }
  92
  93 // generate a printable result for ops
  94 func (r *table_io_waits_summary_by_table_row) ops_row_content(totals table_io_waits_summary_by_table_row) string {
  95         // assume the data is empty so hide it.
  96         name := r.pretty_name()
  97         if r.COUNT_STAR == 0 {
  98                 name = ""
  99         }
 100
 101         return fmt.Sprintf("%-30s %10s %6s|%6s %6s %6s %6s",
 102                 name,
 103                 lib.FormatAmount(r.COUNT_STAR),
 104                 lib.FormatPct(lib.MyDivide(r.COUNT_STAR, totals.COUNT_STAR)),
 105                 lib.FormatPct(lib.MyDivide(r.COUNT_FETCH, r.COUNT_STAR)),
 106                 lib.FormatPct(lib.MyDivide(r.COUNT_INSERT, r.COUNT_STAR)),
 107                 lib.FormatPct(lib.MyDivide(r.COUNT_UPDATE, r.COUNT_STAR)),
 108                 lib.FormatPct(lib.MyDivide(r.COUNT_DELETE, r.COUNT_STAR)))
 109 }
 110
 111 func (this *table_io_waits_summary_by_table_row) add(other table_io_waits_summary_by_table_row) {
 112         this.SUM_TIMER_WAIT += other.SUM_TIMER_WAIT
 113         this.SUM_TIMER_FETCH += other.SUM_TIMER_FETCH
 114         this.SUM_TIMER_INSERT += other.SUM_TIMER_INSERT
 115         this.SUM_TIMER_UPDATE += other.SUM_TIMER_UPDATE
 116         this.SUM_TIMER_DELETE += other.SUM_TIMER_DELETE
 117         this.SUM_TIMER_READ += other.SUM_TIMER_READ
 118         this.SUM_TIMER_WRITE += other.SUM_TIMER_WRITE
 119
 120         this.COUNT_STAR += other.COUNT_STAR
 121         this.COUNT_FETCH += other.COUNT_FETCH
 122         this.COUNT_INSERT += other.COUNT_INSERT
 123         this.COUNT_UPDATE += other.COUNT_UPDATE
 124         this.COUNT_DELETE += other.COUNT_DELETE
 125         this.COUNT_READ += other.COUNT_READ
 126         this.COUNT_WRITE += other.COUNT_WRITE
 127 }
 128
 129 func (this *table_io_waits_summary_by_table_row) subtract(other table_io_waits_summary_by_table_row) {
 130         this.SUM_TIMER_WAIT -= other.SUM_TIMER_WAIT
 131         this.SUM_TIMER_FETCH -= other.SUM_TIMER_FETCH
 132         this.SUM_TIMER_INSERT -= other.SUM_TIMER_INSERT
 133         this.SUM_TIMER_UPDATE -= other.SUM_TIMER_UPDATE
 134         this.SUM_TIMER_DELETE -= other.SUM_TIMER_DELETE
 135         this.SUM_TIMER_READ -= other.SUM_TIMER_READ
 136         this.SUM_TIMER_WRITE -= other.SUM_TIMER_WRITE
 137
 138         this.COUNT_STAR -= other.COUNT_STAR
 139         this.COUNT_FETCH -= other.COUNT_FETCH
 140         this.COUNT_INSERT -= other.COUNT_INSERT
 141         this.COUNT_UPDATE -= other.COUNT_UPDATE
 142         this.COUNT_DELETE -= other.COUNT_DELETE
 143         this.COUNT_READ -= other.COUNT_READ
 144         this.COUNT_WRITE -= other.COUNT_WRITE
 145 }
 146
 147 func (t table_io_waits_summary_by_table_rows) totals() table_io_waits_summary_by_table_row {
 148         var totals table_io_waits_summary_by_table_row
 149         totals.OBJECT_SCHEMA = "TOTALS"
 150
 151         for i := range t {
 152                 totals.add(t[i])
 153         }
 154
 155         return totals
 156 }
 157
 158 func select_tiwsbt_rows(dbh *sql.DB) table_io_waits_summary_by_table_rows {
 159         var t table_io_waits_summary_by_table_rows
 160
 161         // we collect all information even if it's mainly empty as we may reference it later
 162         sql := "SELECT OBJECT_TYPE, OBJECT_SCHEMA, OBJECT_NAME, COUNT_STAR, SUM_TIMER_WAIT, COUNT_READ, SUM_TIMER_READ, COUNT_WRITE, SUM_TIMER_WRITE, COUNT_FETCH, SUM_TIMER_FETCH, COUNT_INSERT, SUM_TIMER_INSERT, COUNT_UPDATE, SUM_TIMER_UPDATE, COUNT_DELETE, SUM_TIMER_DELETE FROM table_io_waits_summary_by_table WHERE SUM_TIMER_WAIT > 0"
 163
 164         rows, err := dbh.Query(sql)
 165         if err != nil {
 166                 log.Fatal(err)
 167         }
 168         defer rows.Close()
 169
 170         for rows.Next() {
 171                 var r table_io_waits_summary_by_table_row
 172                 if err := rows.Scan(
 173                         &r.OBJECT_TYPE,
 174                         &r.OBJECT_SCHEMA,
 175                         &r.OBJECT_NAME,
 176                         &r.COUNT_STAR,
 177                         &r.SUM_TIMER_WAIT,
 178                         &r.COUNT_READ,
 179                         &r.SUM_TIMER_READ,
 180                         &r.COUNT_WRITE,
 181                         &r.SUM_TIMER_WRITE,
 182                         &r.COUNT_FETCH,
 183                         &r.SUM_TIMER_FETCH,
 184                         &r.COUNT_INSERT,
 185                         &r.SUM_TIMER_INSERT,
 186                         &r.COUNT_UPDATE,
 187                         &r.SUM_TIMER_UPDATE,
 188                         &r.COUNT_DELETE,
 189                         &r.SUM_TIMER_DELETE); err != nil {
 190                         log.Fatal(err)
 191                 }
 192                 // we collect all information even if it's mainly empty as we may reference it later
 193                 t = append(t, r)
 194         }
 195         if err := rows.Err(); err != nil {
 196                 log.Fatal(err)
 197         }
 198
 199         return t
 200 }
 201
 202 func (t table_io_waits_summary_by_table_rows) Len() int      { return len(t) }
 203 func (t table_io_waits_summary_by_table_rows) Swap(i, j int) { t[i], t[j] = t[j], t[i] }
 204
 205 // sort by value (descending) but also by "name" (ascending) if the values are the same
 206 func (t table_io_waits_summary_by_table_rows) Less(i, j int) bool {
 207         return (t[i].SUM_TIMER_WAIT > t[j].SUM_TIMER_WAIT) ||
 208                 ((t[i].SUM_TIMER_WAIT == t[j].SUM_TIMER_WAIT) &&
 209                         (t[i].OBJECT_SCHEMA < t[j].OBJECT_SCHEMA) &&
 210                         (t[i].OBJECT_NAME < t[j].OBJECT_NAME))
 211 }
 212
 213 // for sorting
 214 type ByOps table_io_waits_summary_by_table_rows
 215
 216 func (t ByOps) Len() int      { return len(t) }
 217 func (t ByOps) Swap(i, j int) { t[i], t[j] = t[j], t[i] }
 218 func (t ByOps) Less(i, j int) bool {
 219         return (t[i].COUNT_STAR > t[j].COUNT_STAR) ||
 220                 ((t[i].SUM_TIMER_WAIT == t[j].SUM_TIMER_WAIT) &&
 221                         (t[i].OBJECT_SCHEMA < t[j].OBJECT_SCHEMA) &&
 222                         (t[i].OBJECT_NAME < t[j].OBJECT_NAME))
 223 }
 224
 225 func (t table_io_waits_summary_by_table_rows) Sort(want_latency bool) {
 226         if want_latency {
 227                 sort.Sort(t)
 228         } else {
 229                 sort.Sort(ByOps(t))
 230         }
 231 }
 232
 233 // remove the initial values from those rows where there's a match
 234 // - if we find a row we can't match ignore it
 235 func (this *table_io_waits_summary_by_table_rows) subtract(initial table_io_waits_summary_by_table_rows) {
 236         i_by_name := make(map[string]int)
 237
 238         // iterate over rows by name
 239         for i := range initial {
 240                 i_by_name[initial[i].name()] = i
 241         }
 242
 243         for i := range *this {
 244                 if _, ok := i_by_name[(*this)[i].name()]; ok {
 245                         initial_i := i_by_name[(*this)[i].name()]
 246                         (*this)[i].subtract(initial[initial_i])
 247                 }
 248         }
 249 }
 250
 251 // if the data in t2 is "newer", "has more values" than t then it needs refreshing.
 252 // check this by comparing totals.
 253 func (t table_io_waits_summary_by_table_rows) needs_refresh(t2 table_io_waits_summary_by_table_rows) bool {
 254         my_totals := t.totals()
 255         t2_totals := t2.totals()
 256
 257         return my_totals.SUM_TIMER_WAIT > t2_totals.SUM_TIMER_WAIT
 258 }
 259
 260 // describe a whole row
 261 func (r table_io_waits_summary_by_table_row) String() string {
 262         return fmt.Sprintf("%-30s|%10s %10s %10s %10s %10s|%10s %10s|%10s %10s %10s %10s %10s|%10s %10s",
 263                 r.pretty_name(),
 264                 lib.FormatTime(r.SUM_TIMER_WAIT),
 265                 lib.FormatTime(r.SUM_TIMER_FETCH),
 266                 lib.FormatTime(r.SUM_TIMER_INSERT),
 267                 lib.FormatTime(r.SUM_TIMER_UPDATE),
 268                 lib.FormatTime(r.SUM_TIMER_DELETE),
 269
 270                 lib.FormatTime(r.SUM_TIMER_READ),
 271                 lib.FormatTime(r.SUM_TIMER_WRITE),
 272
 273                 lib.FormatAmount(r.COUNT_STAR),
 274                 lib.FormatAmount(r.COUNT_FETCH),
 275                 lib.FormatAmount(r.COUNT_INSERT),
 276                 lib.FormatAmount(r.COUNT_UPDATE),
 277                 lib.FormatAmount(r.COUNT_DELETE),
 278
 279                 lib.FormatAmount(r.COUNT_READ),
 280                 lib.FormatAmount(r.COUNT_WRITE))
 281 }
 282
 283 // describe a whole table
 284 func (t table_io_waits_summary_by_table_rows) String() string {
 285         s := make([]string, len(t))
 286
 287         for i := range t {
 288                 s = append(s, t[i].String())
 289         }
 290
 291         return strings.Join(s, "\n")
 292 }