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
66 {- | Start computing the solution at the given depth and recurse until
67 we find a valid solution or we exceed the maximum depth.
70 iterateDepth :: Cluster.Table -- ^ The starting table
71 -> Int -- ^ Remaining length
72 -> Int -- ^ Max node name len
73 -> Int -- ^ Max instance name len
74 -> [[String]] -- ^ Current command list
75 -> Bool -- ^ Whether to be silent
76 -> Cluster.Score -- ^ Score at which to stop
77 -> IO (Cluster.Table, [[String]]) -- ^ The resulting table and
79 iterateDepth ini_tbl max_rounds nmlen imlen
80 cmd_strs oneline min_score =
81 let Cluster.Table ini_nl ini_il ini_cv ini_plc = ini_tbl
82 all_inst = Container.elems ini_il
83 node_idx = map Node.idx . filter (not . Node.offline) $
84 Container.elems ini_nl
85 fin_tbl = Cluster.checkMove node_idx ini_tbl all_inst
86 (Cluster.Table _ _ fin_cv fin_plc) = fin_tbl
87 ini_plc_len = length ini_plc
88 fin_plc_len = length fin_plc
89 allowed_next = (max_rounds < 0 || length fin_plc < max_rounds)
93 (sol_line, cmds) = Cluster.printSolutionLine ini_nl ini_il
94 nmlen imlen (head fin_plc) fin_plc_len
95 upd_cmd_strs = cmds:cmd_strs
96 unless (oneline || fin_plc_len == ini_plc_len) $ do
99 (if fin_cv < ini_cv then -- this round made success, try deeper
100 if allowed_next && fin_cv > min_score
101 then iterateDepth fin_tbl max_rounds
102 nmlen imlen upd_cmd_strs oneline min_score
103 -- don't go deeper, but return the better solution
104 else return (fin_tbl, upd_cmd_strs)
106 return (ini_tbl, cmd_strs))
108 -- | Formats the solution for the oneline display
109 formatOneline :: Double -> Int -> Double -> String
110 formatOneline ini_cv plc_len fin_cv =
111 printf "%.8f %d %.8f %8.3f" ini_cv plc_len fin_cv
112 (if fin_cv == 0 then 1 else ini_cv / fin_cv)
117 cmd_args <- System.getArgs
118 (opts, args) <- parseOpts cmd_args "hbal" options
120 unless (null args) $ do
121 hPutStrLn stderr "Error: this program doesn't take any arguments."
122 exitWith $ ExitFailure 1
124 let oneline = optOneline opts
125 verbose = optVerbose opts
127 (fixed_nl, il, csf) <- loadExternalData opts
129 let offline_names = optOffline opts
130 all_nodes = Container.elems fixed_nl
131 all_names = map Node.name all_nodes
132 offline_wrong = filter (flip notElem all_names) offline_names
133 offline_indices = map Node.idx $
134 filter (\n -> elem (Node.name n) offline_names)
139 when (length offline_wrong > 0) $ do
140 hPrintf stderr "Wrong node name(s) set as offline: %s\n"
141 (commaJoin offline_wrong)
142 exitWith $ ExitFailure 1
144 let nm = Container.map (\n -> if elem (Node.idx n) offline_indices
145 then Node.setOffline n True
147 nl = Container.map (flip Node.setMdsk m_dsk . flip Node.setMcpu m_cpu)
150 when (Container.size il == 0) $ do
151 (if oneline then putStrLn $ formatOneline 0 0 0
152 else printf "Cluster is empty, exiting.\n")
155 unless oneline $ printf "Loaded %d nodes, %d instances\n"
159 when (length csf > 0 && not oneline && verbose > 1) $
160 printf "Note: Stripping common suffix of '%s' from names\n" csf
162 let (bad_nodes, bad_instances) = Cluster.computeBadItems nl il
163 unless (oneline || verbose == 0) $ printf
164 "Initial check done: %d bad nodes, %d bad instances.\n"
165 (length bad_nodes) (length bad_instances)
167 when (length bad_nodes > 0) $
168 putStrLn "Cluster is not N+1 happy, continuing but no guarantee \
169 \that the cluster will end N+1 happy."
171 when (optShowNodes opts) $
173 putStrLn "Initial cluster status:"
174 putStrLn $ Cluster.printNodes nl
176 let ini_cv = Cluster.compCV nl
177 ini_tbl = Cluster.Table nl il ini_cv []
178 min_cv = optMinScore opts
180 when (ini_cv < min_cv) $ do
182 putStrLn $ formatOneline ini_cv 0 ini_cv
183 else printf "Cluster is already well balanced (initial score %.6g,\n\
184 \minimum score %.6g).\nNothing to do, exiting\n"
188 unless oneline (if verbose > 2 then
189 printf "Initial coefficients: overall %.8f, %s\n"
190 ini_cv (Cluster.printStats nl)
192 printf "Initial score: %.8f\n" ini_cv)
194 unless oneline $ putStrLn "Trying to minimize the CV..."
195 let imlen = Container.maxNameLen il
196 nmlen = Container.maxNameLen nl
198 (fin_tbl, cmd_strs) <- iterateDepth ini_tbl (optMaxLength opts)
199 nmlen imlen [] oneline min_cv
200 let (Cluster.Table fin_nl _ fin_cv fin_plc) = fin_tbl
201 ord_plc = reverse fin_plc
202 sol_msg = if null fin_plc
203 then printf "No solution found\n"
205 then printf "Final coefficients: overall %.8f, %s\n"
206 fin_cv (Cluster.printStats fin_nl)
207 else printf "Cluster score improved from %.8f to %.8f\n"
211 unless oneline $ putStr sol_msg
213 unless (oneline || verbose == 0) $
214 printf "Solution length=%d\n" (length ord_plc)
216 let cmd_data = Cluster.formatCmds . reverse $ cmd_strs
218 when (isJust $ optShowCmds opts) $
220 let out_path = fromJust $ optShowCmds opts
222 (if out_path == "-" then
223 printf "Commands to run to reach the above solution:\n%s"
224 (unlines . map (" " ++) .
225 filter (/= "check") .
228 writeFile out_path (shTemplate ++ cmd_data)
229 printf "The commands have been written to file '%s'\n" out_path)
231 when (optShowNodes opts) $
233 let ini_cs = Cluster.totalResources nl
234 fin_cs = Cluster.totalResources fin_nl
236 putStrLn "Final cluster status:"
237 putStrLn $ Cluster.printNodes fin_nl
240 printf "Original: mem=%d disk=%d\n"
241 (Cluster.cs_fmem ini_cs) (Cluster.cs_fdsk ini_cs)
242 printf "Final: mem=%d disk=%d\n"
243 (Cluster.cs_fmem fin_cs) (Cluster.cs_fdsk fin_cs)
245 putStrLn $ formatOneline ini_cv (length ord_plc) fin_cv