root / Ganeti / HTools / Node.hs @ 844eff86
History | View | Annotate | Download (11.5 kB)
1 |
{-| Module describing a node. |
---|---|
2 |
|
3 |
All updates are functional (copy-based) and return a new node with |
4 |
updated value. |
5 |
-} |
6 |
|
7 |
{- |
8 |
|
9 |
Copyright (C) 2009 Google Inc. |
10 |
|
11 |
This program is free software; you can redistribute it and/or modify |
12 |
it under the terms of the GNU General Public License as published by |
13 |
the Free Software Foundation; either version 2 of the License, or |
14 |
(at your option) any later version. |
15 |
|
16 |
This program is distributed in the hope that it will be useful, but |
17 |
WITHOUT ANY WARRANTY; without even the implied warranty of |
18 |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
19 |
General Public License for more details. |
20 |
|
21 |
You should have received a copy of the GNU General Public License |
22 |
along with this program; if not, write to the Free Software |
23 |
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
24 |
02110-1301, USA. |
25 |
|
26 |
-} |
27 |
|
28 |
module Ganeti.HTools.Node |
29 |
( Node(failN1, name, idx, t_mem, n_mem, f_mem, r_mem, |
30 |
t_dsk, f_dsk, |
31 |
t_cpu, u_cpu, |
32 |
p_mem, p_dsk, p_rem, p_cpu, |
33 |
m_dsk, m_cpu, |
34 |
plist, slist, offline) |
35 |
, List |
36 |
-- * Constructor |
37 |
, create |
38 |
-- ** Finalization after data loading |
39 |
, buildPeers |
40 |
, setIdx |
41 |
, setName |
42 |
, setOffline |
43 |
, setXmem |
44 |
, setFmem |
45 |
, setPri |
46 |
, setSec |
47 |
, setMdsk |
48 |
, setMcpu |
49 |
, addCpus |
50 |
-- * Instance (re)location |
51 |
, removePri |
52 |
, removeSec |
53 |
, addPri |
54 |
, addSec |
55 |
-- * Formatting |
56 |
, list |
57 |
-- * Misc stuff |
58 |
, AssocList |
59 |
, noSecondary |
60 |
) where |
61 |
|
62 |
import Data.List |
63 |
import Text.Printf (printf) |
64 |
|
65 |
import qualified Ganeti.HTools.Container as Container |
66 |
import qualified Ganeti.HTools.Instance as Instance |
67 |
import qualified Ganeti.HTools.PeerMap as PeerMap |
68 |
|
69 |
import qualified Ganeti.HTools.Types as T |
70 |
|
71 |
-- * Type declarations |
72 |
|
73 |
-- | The node type. |
74 |
data Node = Node { name :: String -- ^ The node name |
75 |
, t_mem :: Double -- ^ Total memory (MiB) |
76 |
, n_mem :: Int -- ^ Node memory (MiB) |
77 |
, f_mem :: Int -- ^ Free memory (MiB) |
78 |
, x_mem :: Int -- ^ Unaccounted memory (MiB) |
79 |
, t_dsk :: Double -- ^ Total disk space (MiB) |
80 |
, f_dsk :: Int -- ^ Free disk space (MiB) |
81 |
, t_cpu :: Double -- ^ Total CPU count |
82 |
, u_cpu :: Int -- ^ Used VCPU count |
83 |
, plist :: [T.Idx]-- ^ List of primary instance indices |
84 |
, slist :: [T.Idx]-- ^ List of secondary instance indices |
85 |
, idx :: T.Ndx -- ^ Internal index for book-keeping |
86 |
, peers :: PeerMap.PeerMap -- ^ Pnode to instance mapping |
87 |
, failN1:: Bool -- ^ Whether the node has failed n1 |
88 |
, r_mem :: Int -- ^ Maximum memory needed for |
89 |
-- failover by primaries of this node |
90 |
, p_mem :: Double -- ^ Percent of free memory |
91 |
, p_dsk :: Double -- ^ Percent of free disk |
92 |
, p_rem :: Double -- ^ Percent of reserved memory |
93 |
, p_cpu :: Double -- ^ Ratio of virtual to physical CPUs |
94 |
, m_dsk :: Double -- ^ Minimum free disk ratio |
95 |
, m_cpu :: Double -- ^ Max ratio of virt-to-phys CPUs |
96 |
, offline :: Bool -- ^ Whether the node should not be used |
97 |
-- for allocations and skipped from |
98 |
-- score computations |
99 |
} deriving (Show) |
100 |
|
101 |
instance T.Element Node where |
102 |
nameOf = name |
103 |
idxOf = idx |
104 |
setName = setName |
105 |
setIdx = setIdx |
106 |
|
107 |
-- | A simple name for the int, node association list. |
108 |
type AssocList = [(T.Ndx, Node)] |
109 |
|
110 |
-- | A simple name for a node map. |
111 |
type List = Container.Container Node |
112 |
|
113 |
-- | Constant node index for a non-moveable instance. |
114 |
noSecondary :: T.Ndx |
115 |
noSecondary = -1 |
116 |
|
117 |
-- * Initialization functions |
118 |
|
119 |
-- | Create a new node. |
120 |
-- |
121 |
-- The index and the peers maps are empty, and will be need to be |
122 |
-- update later via the 'setIdx' and 'buildPeers' functions. |
123 |
create :: String -> Double -> Int -> Int -> Double |
124 |
-> Int -> Double -> Bool -> Node |
125 |
create name_init mem_t_init mem_n_init mem_f_init |
126 |
dsk_t_init dsk_f_init cpu_t_init offline_init = |
127 |
Node |
128 |
{ |
129 |
name = name_init, |
130 |
t_mem = mem_t_init, |
131 |
n_mem = mem_n_init, |
132 |
f_mem = mem_f_init, |
133 |
t_dsk = dsk_t_init, |
134 |
f_dsk = dsk_f_init, |
135 |
t_cpu = cpu_t_init, |
136 |
u_cpu = 0, |
137 |
plist = [], |
138 |
slist = [], |
139 |
failN1 = True, |
140 |
idx = -1, |
141 |
peers = PeerMap.empty, |
142 |
r_mem = 0, |
143 |
p_mem = (fromIntegral mem_f_init) / mem_t_init, |
144 |
p_dsk = (fromIntegral dsk_f_init) / dsk_t_init, |
145 |
p_rem = 0, |
146 |
p_cpu = 0, |
147 |
offline = offline_init, |
148 |
x_mem = 0, |
149 |
m_dsk = -1, |
150 |
m_cpu = -1 |
151 |
} |
152 |
|
153 |
-- | Changes the index. |
154 |
-- |
155 |
-- This is used only during the building of the data structures. |
156 |
setIdx :: Node -> T.Ndx -> Node |
157 |
setIdx t i = t {idx = i} |
158 |
|
159 |
-- | Changes the name. |
160 |
-- |
161 |
-- This is used only during the building of the data structures. |
162 |
setName :: Node -> String -> Node |
163 |
setName t s = t {name = s} |
164 |
|
165 |
-- | Sets the offline attribute. |
166 |
setOffline :: Node -> Bool -> Node |
167 |
setOffline t val = t { offline = val } |
168 |
|
169 |
-- | Sets the unnaccounted memory. |
170 |
setXmem :: Node -> Int -> Node |
171 |
setXmem t val = t { x_mem = val } |
172 |
|
173 |
-- | Sets the max disk usage ratio |
174 |
setMdsk :: Node -> Double -> Node |
175 |
setMdsk t val = t { m_dsk = val } |
176 |
|
177 |
-- | Sets the max cpu usage ratio |
178 |
setMcpu :: Node -> Double -> Node |
179 |
setMcpu t val = t { m_cpu = val } |
180 |
|
181 |
-- | Computes the maximum reserved memory for peers from a peer map. |
182 |
computeMaxRes :: PeerMap.PeerMap -> PeerMap.Elem |
183 |
computeMaxRes new_peers = PeerMap.maxElem new_peers |
184 |
|
185 |
-- | Builds the peer map for a given node. |
186 |
buildPeers :: Node -> Instance.List -> Node |
187 |
buildPeers t il = |
188 |
let mdata = map |
189 |
(\i_idx -> let inst = Container.find i_idx il |
190 |
in (Instance.pnode inst, Instance.mem inst)) |
191 |
(slist t) |
192 |
pmap = PeerMap.accumArray (+) mdata |
193 |
new_rmem = computeMaxRes pmap |
194 |
new_failN1 = computeFailN1 new_rmem (f_mem t) (f_dsk t) |
195 |
new_prem = (fromIntegral new_rmem) / (t_mem t) |
196 |
in t {peers=pmap, failN1 = new_failN1, r_mem = new_rmem, p_rem = new_prem} |
197 |
|
198 |
-- | Assigns an instance to a node as primary without other updates. |
199 |
setPri :: Node -> T.Idx -> Node |
200 |
setPri t idx = t { plist = idx:(plist t) } |
201 |
|
202 |
-- | Assigns an instance to a node as secondary without other updates. |
203 |
setSec :: Node -> T.Idx -> Node |
204 |
setSec t idx = t { slist = idx:(slist t) } |
205 |
|
206 |
-- | Add primary cpus to a node |
207 |
addCpus :: Node -> Int -> Node |
208 |
addCpus t count = |
209 |
let new_count = (u_cpu t) + count |
210 |
in t { u_cpu = new_count, p_cpu = (fromIntegral new_count) / (t_cpu t) } |
211 |
|
212 |
-- * Update functions |
213 |
|
214 |
-- | Sets the free memory. |
215 |
setFmem :: Node -> Int -> Node |
216 |
setFmem t new_mem = |
217 |
let new_n1 = computeFailN1 (r_mem t) new_mem (f_dsk t) |
218 |
new_mp = (fromIntegral new_mem) / (t_mem t) |
219 |
in |
220 |
t { f_mem = new_mem, failN1 = new_n1, p_mem = new_mp } |
221 |
|
222 |
-- | Given the rmem, free memory and disk, computes the failn1 status. |
223 |
computeFailN1 :: Int -> Int -> Int -> Bool |
224 |
computeFailN1 new_rmem new_mem new_dsk = |
225 |
new_mem <= new_rmem || new_dsk <= 0 |
226 |
|
227 |
-- | Given the new free memory and disk, fail if any of them is below zero. |
228 |
failHealth :: Int -> Int -> Bool |
229 |
failHealth new_mem new_dsk = new_mem <= 0 || new_dsk <= 0 |
230 |
|
231 |
-- | Removes a primary instance. |
232 |
removePri :: Node -> Instance.Instance -> Node |
233 |
removePri t inst = |
234 |
let iname = Instance.idx inst |
235 |
new_plist = delete iname (plist t) |
236 |
new_mem = f_mem t + Instance.mem inst |
237 |
new_dsk = f_dsk t + Instance.dsk inst |
238 |
new_mp = (fromIntegral new_mem) / (t_mem t) |
239 |
new_dp = (fromIntegral new_dsk) / (t_dsk t) |
240 |
new_failn1 = computeFailN1 (r_mem t) new_mem new_dsk |
241 |
new_ucpu = (u_cpu t) - (Instance.vcpus inst) |
242 |
new_rcpu = (fromIntegral new_ucpu) / (t_cpu t) |
243 |
in t {plist = new_plist, f_mem = new_mem, f_dsk = new_dsk, |
244 |
failN1 = new_failn1, p_mem = new_mp, p_dsk = new_dp, |
245 |
u_cpu = new_ucpu, p_cpu = new_rcpu} |
246 |
|
247 |
-- | Removes a secondary instance. |
248 |
removeSec :: Node -> Instance.Instance -> Node |
249 |
removeSec t inst = |
250 |
let iname = Instance.idx inst |
251 |
pnode = Instance.pnode inst |
252 |
new_slist = delete iname (slist t) |
253 |
new_dsk = f_dsk t + Instance.dsk inst |
254 |
old_peers = peers t |
255 |
old_peem = PeerMap.find pnode old_peers |
256 |
new_peem = old_peem - (Instance.mem inst) |
257 |
new_peers = PeerMap.add pnode new_peem old_peers |
258 |
old_rmem = r_mem t |
259 |
new_rmem = if old_peem < old_rmem then |
260 |
old_rmem |
261 |
else |
262 |
computeMaxRes new_peers |
263 |
new_prem = (fromIntegral new_rmem) / (t_mem t) |
264 |
new_failn1 = computeFailN1 new_rmem (f_mem t) new_dsk |
265 |
new_dp = (fromIntegral new_dsk) / (t_dsk t) |
266 |
in t {slist = new_slist, f_dsk = new_dsk, peers = new_peers, |
267 |
failN1 = new_failn1, r_mem = new_rmem, p_dsk = new_dp, |
268 |
p_rem = new_prem} |
269 |
|
270 |
-- | Adds a primary instance. |
271 |
addPri :: Node -> Instance.Instance -> Maybe Node |
272 |
addPri t inst = |
273 |
let iname = Instance.idx inst |
274 |
new_mem = f_mem t - Instance.mem inst |
275 |
new_dsk = f_dsk t - Instance.dsk inst |
276 |
new_failn1 = computeFailN1 (r_mem t) new_mem new_dsk |
277 |
new_ucpu = (u_cpu t) + (Instance.vcpus inst) |
278 |
new_pcpu = (fromIntegral new_ucpu) / (t_cpu t) |
279 |
in |
280 |
if (failHealth new_mem new_dsk) || (new_failn1 && not (failN1 t)) then |
281 |
Nothing |
282 |
else |
283 |
let new_plist = iname:(plist t) |
284 |
new_mp = (fromIntegral new_mem) / (t_mem t) |
285 |
new_dp = (fromIntegral new_dsk) / (t_dsk t) |
286 |
in |
287 |
Just t {plist = new_plist, f_mem = new_mem, f_dsk = new_dsk, |
288 |
failN1 = new_failn1, p_mem = new_mp, p_dsk = new_dp, |
289 |
u_cpu = new_ucpu, p_cpu = new_pcpu} |
290 |
|
291 |
-- | Adds a secondary instance. |
292 |
addSec :: Node -> Instance.Instance -> T.Ndx -> Maybe Node |
293 |
addSec t inst pdx = |
294 |
let iname = Instance.idx inst |
295 |
old_peers = peers t |
296 |
old_mem = f_mem t |
297 |
new_dsk = f_dsk t - Instance.dsk inst |
298 |
new_peem = PeerMap.find pdx old_peers + Instance.mem inst |
299 |
new_peers = PeerMap.add pdx new_peem old_peers |
300 |
new_rmem = max (r_mem t) new_peem |
301 |
new_prem = (fromIntegral new_rmem) / (t_mem t) |
302 |
new_failn1 = computeFailN1 new_rmem old_mem new_dsk in |
303 |
if (failHealth old_mem new_dsk) || (new_failn1 && not (failN1 t)) then |
304 |
Nothing |
305 |
else |
306 |
let new_slist = iname:(slist t) |
307 |
new_dp = (fromIntegral new_dsk) / (t_dsk t) |
308 |
in |
309 |
Just t {slist = new_slist, f_dsk = new_dsk, |
310 |
peers = new_peers, failN1 = new_failn1, |
311 |
r_mem = new_rmem, p_dsk = new_dp, |
312 |
p_rem = new_prem} |
313 |
|
314 |
-- * Display functions |
315 |
|
316 |
-- | String converter for the node list functionality. |
317 |
list :: Int -> Node -> String |
318 |
list mname t = |
319 |
let pl = length $ plist t |
320 |
sl = length $ slist t |
321 |
mp = p_mem t |
322 |
dp = p_dsk t |
323 |
cp = p_cpu t |
324 |
off = offline t |
325 |
fn = failN1 t |
326 |
tmem = t_mem t |
327 |
nmem = n_mem t |
328 |
xmem = x_mem t |
329 |
fmem = f_mem t |
330 |
imem = (truncate tmem) - nmem - xmem - fmem |
331 |
in |
332 |
if off |
333 |
then printf " - %-*s %57s %3d %3d" |
334 |
mname (name t) "" pl sl |
335 |
else |
336 |
printf " %c %-*s %5.0f %5d %5d %5d %5d %5d %5.0f %5d\ |
337 |
\ %4.0f %4d %3d %3d %6.4f %6.4f %5.2f" |
338 |
(if off then '-' else if fn then '*' else ' ') |
339 |
mname (name t) tmem nmem imem xmem fmem (r_mem t) |
340 |
((t_dsk t) / 1024) ((f_dsk t) `div` 1024) |
341 |
(t_cpu t) (u_cpu t) |
342 |
pl sl mp dp cp |