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.Utils
45 -- | Options list and functions
67 {- | Start computing the solution at the given depth and recurse until
68 we find a valid solution or we exceed the maximum depth.
71 iterateDepth :: Cluster.Table -- ^ The starting table
72 -> Int -- ^ Remaining length
73 -> Bool -- ^ Allow disk moves
74 -> Int -- ^ Max node name len
75 -> Int -- ^ Max instance name len
76 -> [[String]] -- ^ Current command list
77 -> Bool -- ^ Whether to be silent
78 -> Cluster.Score -- ^ Score at which to stop
79 -> IO (Cluster.Table, [[String]]) -- ^ The resulting table and
81 iterateDepth ini_tbl max_rounds disk_moves nmlen imlen
82 cmd_strs oneline min_score =
83 let Cluster.Table ini_nl ini_il ini_cv ini_plc = ini_tbl
84 all_inst = Container.elems ini_il
85 node_idx = map Node.idx . filter (not . Node.offline) $
86 Container.elems ini_nl
87 fin_tbl = Cluster.checkMove node_idx disk_moves ini_tbl all_inst
88 (Cluster.Table _ _ fin_cv fin_plc) = fin_tbl
89 ini_plc_len = length ini_plc
90 fin_plc_len = length fin_plc
91 allowed_next = (max_rounds < 0 || length fin_plc < max_rounds)
95 (sol_line, cmds) = Cluster.printSolutionLine ini_nl ini_il
96 nmlen imlen (head fin_plc) fin_plc_len
97 upd_cmd_strs = cmds:cmd_strs
98 unless (oneline || fin_plc_len == ini_plc_len) $ do
101 (if fin_cv < ini_cv then -- this round made success, try deeper
102 if allowed_next && fin_cv > min_score
103 then iterateDepth fin_tbl max_rounds disk_moves
104 nmlen imlen upd_cmd_strs oneline min_score
105 -- don't go deeper, but return the better solution
106 else return (fin_tbl, upd_cmd_strs)
108 return (ini_tbl, cmd_strs))
110 -- | Formats the solution for the oneline display
111 formatOneline :: Double -> Int -> Double -> String
112 formatOneline ini_cv plc_len fin_cv =
113 printf "%.8f %d %.8f %8.3f" ini_cv plc_len fin_cv
114 (if fin_cv == 0 then 1 else ini_cv / fin_cv)
119 cmd_args <- System.getArgs
120 (opts, args) <- parseOpts cmd_args "hbal" options
122 unless (null args) $ do
123 hPutStrLn stderr "Error: this program doesn't take any arguments."
124 exitWith $ ExitFailure 1
126 let oneline = optOneline opts
127 verbose = optVerbose opts
129 (fixed_nl, il, csf) <- loadExternalData opts
131 let offline_names = optOffline opts
132 all_nodes = Container.elems fixed_nl
133 all_names = map Node.name all_nodes
134 offline_wrong = filter (flip notElem all_names) offline_names
135 offline_indices = map Node.idx $
136 filter (\n -> elem (Node.name n) offline_names)
141 when (length offline_wrong > 0) $ do
142 hPrintf stderr "Wrong node name(s) set as offline: %s\n"
143 (commaJoin offline_wrong)
144 exitWith $ ExitFailure 1
146 let nm = Container.map (\n -> if elem (Node.idx n) offline_indices
147 then Node.setOffline n True
149 nl = Container.map (flip Node.setMdsk m_dsk . flip Node.setMcpu m_cpu)
152 when (Container.size il == 0) $ do
153 (if oneline then putStrLn $ formatOneline 0 0 0
154 else printf "Cluster is empty, exiting.\n")
157 unless oneline $ printf "Loaded %d nodes, %d instances\n"
161 when (length csf > 0 && not oneline && verbose > 1) $
162 printf "Note: Stripping common suffix of '%s' from names\n" csf
164 let (bad_nodes, bad_instances) = Cluster.computeBadItems nl il
165 unless (oneline || verbose == 0) $ printf
166 "Initial check done: %d bad nodes, %d bad instances.\n"
167 (length bad_nodes) (length bad_instances)
169 when (length bad_nodes > 0) $
170 putStrLn "Cluster is not N+1 happy, continuing but no guarantee \
171 \that the cluster will end N+1 happy."
173 when (optShowNodes opts) $
175 putStrLn "Initial cluster status:"
176 putStrLn $ Cluster.printNodes nl
178 let ini_cv = Cluster.compCV nl
179 ini_tbl = Cluster.Table nl il ini_cv []
180 min_cv = optMinScore opts
182 when (ini_cv < min_cv) $ do
184 putStrLn $ formatOneline ini_cv 0 ini_cv
185 else printf "Cluster is already well balanced (initial score %.6g,\n\
186 \minimum score %.6g).\nNothing to do, exiting\n"
190 unless oneline (if verbose > 2 then
191 printf "Initial coefficients: overall %.8f, %s\n"
192 ini_cv (Cluster.printStats nl)
194 printf "Initial score: %.8f\n" ini_cv)
196 unless oneline $ putStrLn "Trying to minimize the CV..."
197 let imlen = Container.maxNameLen il
198 nmlen = Container.maxNameLen nl
200 (fin_tbl, cmd_strs) <- iterateDepth ini_tbl (optMaxLength opts)
202 nmlen imlen [] oneline min_cv
203 let (Cluster.Table fin_nl _ fin_cv fin_plc) = fin_tbl
204 ord_plc = reverse fin_plc
205 sol_msg = if null fin_plc
206 then printf "No solution found\n"
208 then printf "Final coefficients: overall %.8f, %s\n"
209 fin_cv (Cluster.printStats fin_nl)
210 else printf "Cluster score improved from %.8f to %.8f\n"
214 unless oneline $ putStr sol_msg
216 unless (oneline || verbose == 0) $
217 printf "Solution length=%d\n" (length ord_plc)
219 let cmd_data = Cluster.formatCmds . reverse $ cmd_strs
221 when (isJust $ optShowCmds opts) $
223 let out_path = fromJust $ optShowCmds opts
225 (if out_path == "-" then
226 printf "Commands to run to reach the above solution:\n%s"
227 (unlines . map (" " ++) .
228 filter (/= "check") .
231 writeFile out_path (shTemplate ++ cmd_data)
232 printf "The commands have been written to file '%s'\n" out_path)
234 when (optShowNodes opts) $
236 let ini_cs = Cluster.totalResources nl
237 fin_cs = Cluster.totalResources fin_nl
239 putStrLn "Final cluster status:"
240 putStrLn $ Cluster.printNodes fin_nl
243 printf "Original: mem=%d disk=%d\n"
244 (Cluster.cs_fmem ini_cs) (Cluster.cs_fdsk ini_cs)
245 printf "Final: mem=%d disk=%d\n"
246 (Cluster.cs_fmem fin_cs) (Cluster.cs_fdsk fin_cs)
248 putStrLn $ formatOneline ini_cv (length ord_plc) fin_cv