7 Copyright (C) 2009 Google Inc.
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 2 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful, but
15 WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program; if not, write to the Free Software
21 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
26 module Main (main) where
30 import Data.Maybe (isJust, fromJust)
34 import qualified System
36 import Text.Printf (printf, hPrintf)
38 import qualified Ganeti.HTools.Container as Container
39 import qualified Ganeti.HTools.Cluster as Cluster
40 import qualified Ganeti.HTools.Node as Node
42 import Ganeti.HTools.CLI
43 import Ganeti.HTools.ExtLoader
44 import Ganeti.HTools.Utils
45 import Ganeti.HTools.Types
47 -- | Options list and functions
69 {- | Start computing the solution at the given depth and recurse until
70 we find a valid solution or we exceed the maximum depth.
73 iterateDepth :: Cluster.Table -- ^ The starting table
74 -> Int -- ^ Remaining length
75 -> Bool -- ^ Allow disk moves
76 -> Int -- ^ Max node name len
77 -> Int -- ^ Max instance name len
78 -> [MoveJob] -- ^ Current command list
79 -> Bool -- ^ Whether to be silent
80 -> Score -- ^ Score at which to stop
81 -> IO (Cluster.Table, [MoveJob]) -- ^ The resulting table
83 iterateDepth ini_tbl max_rounds disk_moves nmlen imlen
84 cmd_strs oneline min_score =
85 let Cluster.Table ini_nl ini_il _ _ = ini_tbl
86 m_fin_tbl = Cluster.tryBalance ini_tbl max_rounds disk_moves min_score
92 (Cluster.Table _ _ _ fin_plc) = fin_tbl
93 fin_plc_len = length fin_plc
94 cur_plc@(_, _, _, move, _) = head fin_plc
95 (sol_line, cmds) = Cluster.printSolutionLine ini_nl ini_il
96 nmlen imlen cur_plc fin_plc_len
97 afn = Cluster.involvedNodes ini_il cur_plc
98 upd_cmd_strs = (afn, move, cmds):cmd_strs
102 iterateDepth fin_tbl max_rounds disk_moves
103 nmlen imlen upd_cmd_strs oneline min_score
104 Nothing -> return (ini_tbl, cmd_strs)
106 -- | Formats the solution for the oneline display
107 formatOneline :: Double -> Int -> Double -> String
108 formatOneline ini_cv plc_len fin_cv =
109 printf "%.8f %d %.8f %8.3f" ini_cv plc_len fin_cv
110 (if fin_cv == 0 then 1 else ini_cv / fin_cv)
115 cmd_args <- System.getArgs
116 (opts, args) <- parseOpts cmd_args "hbal" options
118 unless (null args) $ do
119 hPutStrLn stderr "Error: this program doesn't take any arguments."
120 exitWith $ ExitFailure 1
122 let oneline = optOneline opts
123 verbose = optVerbose opts
125 (fixed_nl, il, csf) <- loadExternalData opts
127 let offline_names = optOffline opts
128 all_nodes = Container.elems fixed_nl
129 all_names = map Node.name all_nodes
130 offline_wrong = filter (flip notElem all_names) offline_names
131 offline_indices = map Node.idx $
132 filter (\n -> elem (Node.name n) offline_names)
137 when (length offline_wrong > 0) $ do
138 hPrintf stderr "Wrong node name(s) set as offline: %s\n"
139 (commaJoin offline_wrong)
140 exitWith $ ExitFailure 1
142 let nm = Container.map (\n -> if elem (Node.idx n) offline_indices
143 then Node.setOffline n True
145 nl = Container.map (flip Node.setMdsk m_dsk . flip Node.setMcpu m_cpu)
148 when (Container.size il == 0) $ do
149 (if oneline then putStrLn $ formatOneline 0 0 0
150 else printf "Cluster is empty, exiting.\n")
153 unless oneline $ printf "Loaded %d nodes, %d instances\n"
157 when (length csf > 0 && not oneline && verbose > 1) $
158 printf "Note: Stripping common suffix of '%s' from names\n" csf
160 let (bad_nodes, bad_instances) = Cluster.computeBadItems nl il
161 unless (oneline || verbose == 0) $ printf
162 "Initial check done: %d bad nodes, %d bad instances.\n"
163 (length bad_nodes) (length bad_instances)
165 when (length bad_nodes > 0) $
166 putStrLn "Cluster is not N+1 happy, continuing but no guarantee \
167 \that the cluster will end N+1 happy."
169 when (optShowNodes opts) $
171 putStrLn "Initial cluster status:"
172 putStrLn $ Cluster.printNodes nl
174 let ini_cv = Cluster.compCV nl
175 ini_tbl = Cluster.Table nl il ini_cv []
176 min_cv = optMinScore opts
178 when (ini_cv < min_cv) $ do
180 putStrLn $ formatOneline ini_cv 0 ini_cv
181 else printf "Cluster is already well balanced (initial score %.6g,\n\
182 \minimum score %.6g).\nNothing to do, exiting\n"
186 unless oneline (if verbose > 2 then
187 printf "Initial coefficients: overall %.8f, %s\n"
188 ini_cv (Cluster.printStats nl)
190 printf "Initial score: %.8f\n" ini_cv)
192 unless oneline $ putStrLn "Trying to minimize the CV..."
193 let imlen = Container.maxNameLen il
194 nmlen = Container.maxNameLen nl
196 (fin_tbl, cmd_strs) <- iterateDepth ini_tbl (optMaxLength opts)
198 nmlen imlen [] oneline min_cv
199 let (Cluster.Table fin_nl _ fin_cv fin_plc) = fin_tbl
200 ord_plc = reverse fin_plc
201 sol_msg = if null fin_plc
202 then printf "No solution found\n"
204 then printf "Final coefficients: overall %.8f, %s\n"
205 fin_cv (Cluster.printStats fin_nl)
206 else printf "Cluster score improved from %.8f to %.8f\n"
210 unless oneline $ putStr sol_msg
212 unless (oneline || verbose == 0) $
213 printf "Solution length=%d\n" (length ord_plc)
215 let cmd_data = Cluster.formatCmds . Cluster.splitJobs $ cmd_strs
217 when (isJust $ optShowCmds opts) $
219 let out_path = fromJust $ optShowCmds opts
221 (if out_path == "-" then
222 printf "Commands to run to reach the above solution:\n%s"
223 (unlines . map (" " ++) .
224 filter (/= " check") .
227 writeFile out_path (shTemplate ++ cmd_data)
228 printf "The commands have been written to file '%s'\n" out_path)
230 when (optShowNodes opts) $
232 let ini_cs = Cluster.totalResources nl
233 fin_cs = Cluster.totalResources fin_nl
235 putStrLn "Final cluster status:"
236 putStrLn $ Cluster.printNodes fin_nl
239 printf "Original: mem=%d disk=%d\n"
240 (Cluster.cs_fmem ini_cs) (Cluster.cs_fdsk ini_cs)
241 printf "Final: mem=%d disk=%d\n"
242 (Cluster.cs_fmem fin_cs) (Cluster.cs_fdsk fin_cs)
244 putStrLn $ formatOneline ini_cv (length ord_plc) fin_cv