[1273] | 1 | # ---------------------------------------------------------------------- |
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| 2 | # P2P: wonks |
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| 3 | # |
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| 4 | # This code manages the calculation of "wonks" within a worker node. |
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| 5 | # Wonks are measured by executing the "perftest" program on the |
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| 6 | # worker node to see how fast it can finish the calculation. |
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| 7 | # ---------------------------------------------------------------------- |
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| 8 | # Michael McLennan (mmclennan@purdue.edu) |
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| 9 | # ====================================================================== |
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[3177] | 10 | # Copyright (c) 2004-2012 HUBzero Foundation, LLC |
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[1273] | 11 | # |
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| 12 | # See the file "license.terms" for information on usage and |
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| 13 | # redistribution of this file, and for a DISCLAIMER OF ALL WARRANTIES. |
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| 14 | # ====================================================================== |
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| 15 | package require Rappture |
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| 16 | |
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| 17 | namespace eval p2p { # forward declaration } |
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| 18 | |
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| 19 | namespace eval p2p::wonks { |
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| 20 | # remember this directory -- perftest sits here too |
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| 21 | variable dir [file dirname [info script]] |
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| 22 | |
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| 23 | # version info from perftest |
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| 24 | variable version "?" |
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| 25 | } |
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| 26 | |
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| 27 | # number of seconds between each check of system load |
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| 28 | p2p::options register wonks_time_between_checks 60000 |
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| 29 | |
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| 30 | # fraction between 0-1 indicating a significant change in wonks |
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| 31 | p2p::options register wonk_tolerance 0.1 |
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| 32 | |
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| 33 | # ---------------------------------------------------------------------- |
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| 34 | # WONKS CHECK |
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| 35 | # |
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| 36 | # This is the state machine controlling the periodic testing for |
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| 37 | # the available wonks on this machine. The "perftest" program is |
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| 38 | # executed from time to time to compute the available wonks, and |
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| 39 | # the results are stored in an array of tuples. At any point, we |
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| 40 | # can estimate the number of wonks by getting the load and available |
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| 41 | # memory and interpolating within the available tuple data. |
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| 42 | # ---------------------------------------------------------------------- |
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| 43 | StateMachine wonks-check |
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| 44 | |
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| 45 | # sit here at times between sampling |
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| 46 | # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - |
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| 47 | wonks-check state idle -onenter { |
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| 48 | set delay [p2p::options get wonks_time_between_checks] |
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| 49 | after $delay {wonks-check goto checking} |
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| 50 | } -onleave { |
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| 51 | after cancel {wonks-check goto checking} |
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| 52 | } |
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| 53 | |
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| 54 | # sit here while we're sampling |
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| 55 | # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - |
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| 56 | wonks-check state checking |
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| 57 | |
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| 58 | # when moving to the checking state, test available wonks |
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| 59 | # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - |
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| 60 | wonks-check transition idle->checking -onchange { |
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| 61 | set data [wonks-check statedata perftable] |
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| 62 | |
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| 63 | set getWonks 0 ;# probably won't have to use perftest |
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| 64 | |
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| 65 | # measure system load and estimate the available wonks |
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| 66 | foreach {load mem} [Rappture::sysinfo load1 freeswap] break |
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| 67 | set load [format "%.1f" $load] |
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| 68 | set mem [expr {$mem/1048576}] ;# in megabytes |
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| 69 | set wval 0 |
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| 70 | set nsamples 0 |
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| 71 | |
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| 72 | if {![$data inrange [list $load $mem -- --]]} { |
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| 73 | # outside range of data -- must call perftest |
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| 74 | set getWonks 1 |
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| 75 | } else { |
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| 76 | set rec [$data find -nearest [list $load $mem -- --]] |
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| 77 | set prevload [lindex $rec 0] |
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| 78 | set prevmem [lindex $rec 1] |
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| 79 | set tol [p2p::options get wonk_tolerance] |
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| 80 | |
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| 81 | set closeEnough 1 |
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| 82 | if {"" == $prevload || ($load+$prevload > 0 |
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| 83 | && abs($load-$prevload)/(0.5*double($load+$prevload)) > $tol)} { |
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| 84 | # load differs by more than the tolerance -- must test |
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| 85 | set closeEnough 0 |
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| 86 | } elseif {"" == $prevmem || ($mem+$prevmem > 0 |
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| 87 | && abs($mem-$prevmem)/(0.5*double($mem+$prevmem)) > $tol)} { |
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| 88 | set closeEnough 0 |
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| 89 | } |
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| 90 | |
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| 91 | if {$closeEnough} { |
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| 92 | # close enough to some other sample point |
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| 93 | # update the existing data point in the table |
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| 94 | set load $prevload |
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| 95 | set mem $prevmem |
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| 96 | |
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| 97 | set wval [lindex $rec 2] |
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| 98 | set nsamples [lindex $rec 3] |
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| 99 | if {$nsamples < 5} { |
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| 100 | # not very many samples? then do another |
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| 101 | set getWonks 1 |
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| 102 | } elseif {$nsamples < 50 && rand() > 0.9} { |
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| 103 | # if we have a lot of samples do another from time to time |
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| 104 | set getWonks 1 |
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| 105 | } |
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| 106 | } |
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| 107 | } |
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| 108 | |
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| 109 | # if we need a new reading, exec the perftest program... |
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| 110 | if {$getWonks} { |
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| 111 | # Run the program, but don't use exec, since it blocks. |
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| 112 | # Instead, run it in the background and harvest its output later. |
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| 113 | set prog [open "| [file join $p2p::wonks::dir perftest]" r] |
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| 114 | fileevent $prog readable {wonks-check goto update} |
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| 115 | wonks-check statedata sysinfo [list $load $mem $wval $nsamples] |
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| 116 | wonks-check statedata prog $prog |
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| 117 | } else { |
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| 118 | after idle {wonks-check goto idle} |
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| 119 | } |
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| 120 | } |
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| 121 | |
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| 122 | # go here when perftest has finished |
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| 123 | # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - |
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| 124 | wonks-check state update |
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| 125 | |
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| 126 | # when moving to the update state, store the data from perftest |
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| 127 | # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - |
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| 128 | wonks-check transition checking->update -onchange { |
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| 129 | set data [wonks-check statedata perftable] |
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| 130 | set prog [wonks-check statedata prog] |
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| 131 | |
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| 132 | if {[catch {read $prog} msg] == 0} { |
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| 133 | if {[regexp {^([^ ]+) +([0-9]+)} $msg match vstr wval]} { |
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| 134 | set p2p::wonks::version $vstr |
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| 135 | foreach {load mem oldwval nsamples} [wonks-check statedata sysinfo] break |
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| 136 | if {$nsamples >= 1} { |
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| 137 | # average new value with old values |
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| 138 | set wval [expr {$wval/double($nsamples+1) |
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| 139 | + $nsamples/double($nsamples+1)*$oldwval}] |
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| 140 | } |
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| 141 | $data delete [list $load $mem -- --] |
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| 142 | $data add [list $load $mem $wval [incr nsamples]] |
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| 143 | } else { |
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| 144 | log error "ERROR: performance test failed: $msg" |
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| 145 | } |
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| 146 | } |
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| 147 | catch {close $prog} |
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| 148 | wonks-check statedata prog "" |
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| 149 | wonks-check statedata sysinfo "" |
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| 150 | |
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| 151 | after idle {wonks-check goto idle} |
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| 152 | } |
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| 153 | |
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| 154 | # ---------------------------------------------------------------------- |
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| 155 | # COMMAND: p2p::wonks::init |
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| 156 | # |
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| 157 | # Invoked when a worker node starts up to initialize this part of |
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| 158 | # the package. This triggers autoloading of the file, and also |
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| 159 | # initializes variables used by the functions in this file. |
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| 160 | # ---------------------------------------------------------------------- |
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| 161 | proc p2p::wonks::init {} { |
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| 162 | variable version |
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| 163 | set version "?" |
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| 164 | |
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| 165 | set data [Rappture::tuples ::#auto] |
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| 166 | $data dimension add load1 |
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| 167 | $data dimension add freeswap |
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| 168 | $data dimension add wonks |
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| 169 | $data dimension add nsamples |
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| 170 | wonks-check statedata perftable $data |
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| 171 | |
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| 172 | wonks-check goto idle |
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| 173 | } |
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| 174 | |
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| 175 | # ---------------------------------------------------------------------- |
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| 176 | # COMMAND: p2p::wonks::current |
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| 177 | # |
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| 178 | # Used to estimate the current performance of this node as a number |
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| 179 | # of wonks. Takes |
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| 180 | # ---------------------------------------------------------------------- |
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| 181 | proc p2p::wonks::current {} { |
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| 182 | foreach {load mem} [Rappture::sysinfo load1 freeswap] break |
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| 183 | set load [format "%.1f" $load] |
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| 184 | set mem [expr {$mem/1048576}] ;# in megabytes |
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| 185 | |
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| 186 | set data [wonks-check statedata perftable] |
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| 187 | if {[$data inrange [list $load $mem -- --]]} { |
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| 188 | set wval [$data interpolate wonks [list $load $mem -- --]] |
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| 189 | return [list $p2p::wonks::version [expr {round($wval)}]] |
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| 190 | } |
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| 191 | |
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| 192 | # don't have any data -- we're forced to exec perftest and block |
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| 193 | if {[catch {exec [file join $p2p::wonks::dir perftest]} msg] == 0 |
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| 194 | && [regexp {^([^ ]+) +([0-9]+)} $msg match vstr wval]} { |
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| 195 | $data add [list $load $mem $wval 1] |
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| 196 | set p2p::wonks::version $vstr |
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| 197 | return [list $vstr $wval] |
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| 198 | } |
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| 199 | |
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| 200 | # can't even exec perftest -- return some large bogus value |
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| 201 | return [list bogus 1000000] |
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| 202 | } |
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