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From Philippe <watche...@gmail.com>
Subject CPU -> 0% on nodes
Date Thu, 08 Dec 2011 19:39:34 GMT
Hello (5-nodes, RF=3, 32GB RAM, 0.8.6, BOP, 6x2.33Ghz AMD cores)
I'm encountering a weird issue on my CPU-bound workload. Basically I have
two processes
 - one is sending counter increments as fast as it can for a couple tens of
seconds. When few were issued it sleeps for 30 seconds
 - another is reading thousands of keys per second, computing a PNG and
writing the PNG out. I've got about a dozen threads doing this in //

When the cluster is loaded, the first process starts timing out. When this
happens, the nodes just freeze all at the same time : CPU goes down to 0
(as seen below). This happens every single time. And I can see the second
process gets paused during this timeout
Any ideas why this might be happening ?

Thanks
Philippe


 0  0    128 165472   8304 14347412    0    0     0     0  289  281  0  0
100  0
 5  0    128 166452   8288 14337836    0    0     2    32  449  483  1  1
98  0
 0  1    128 170252   8288 14337872    0    0     6     0  551  597  1  1
98  0
 1  0    128 180968   8280 14329708    0    0     0    16 2276 2151 12  3
84  0
 2  0    128 166788   8288 14329900    0    0     0    58 2368 2316 13  4
83  0
 0  0    128 179676   8288 14329960    0    0    94    10 2438 2411 13  4
83  0
 4  1    128 173012   8296 14331244    0    0   660    26 22201 40483 50  8
40  1
21  0    128 172224   8296 14333276    0    0   926   146 29059 52564 70  9
19  1
20  0    128 164532   8296 14335092    0    0   814    36 31140 72887 75 10
14  1
10  0    128 160648   8304 14335316    0    0    46    52 31737 85292 78 11
11  0
38  0    128 167832   8304 14328224    0    0   298     0 26278 71371 79  8
12  0
 7  0    128 177600   8304 14328656    0    0   216     0 23951 66422 78  9
13  1
 4  0    128 177776   8312 14332372    0    0  2116   330 15475 24864 47  7
43  3
 1  0    128 177840   8312 14332208    0    0     0    15 2719 2646 13  4
83  0
 1  0    128 165456   8320 14332424    0    0     0    42 3013 2786 15  3
81  0
 3  0    128 178776   8320 14332332    0    0     0    10 21238 47980 44  8
47  0
 1  0    128 179048   8320 14332332    0    0     0     0 8365 11498 28  6
66  0
 0  0    128 178476   8328 14332396    0    0     0    38 7135 8871 26  3
71  0
 1  0    128 177004   8328 14332336    0    0     0    34 4220 4494 17  3
80  0
 1  0    128 178364   8336 14332368    0    0     0    40 6023 6676 20  4
76  0
 1  0    128 165420   8336 14332432    0    0     0    10 7590 8065 27  5
69  0
 0  0    128 179204   8336 14332368    0    0     0     6 8593 10051 29  5
66  0
 3  0    128 166092   8344 14332368    0    0     0    26 3416 3709 11  2
87  0
 1  0    128 174644   8344 14332332    0    0     0    14 2193 2178 13  4
83  0
 1  0    128 178216   8344 14332332    0    0     0     0 2019 1955 12  3
85  0
 8  0    128 177256   8352 14333704    0    0   558    74 17155 28102 50  6
44  0
13  0    128 176964   8352 14334388    0    0   262     4 25344 43567 56  9
34  1
20  0    128 176472   8360 14334120    0    0   116   276 21765 35447 46  9
44  0
 8  0    128 180508   8356 14329500    0    0  1494    18 30749 42590 53 10
36  2
 1  0    128 164908   8356 14331800    0    0  1006     0 23405 37877 59  9
33  0
10  0    128 178016   8364 14332748    0    0   424    44 24255 37797 55  9
36  0
 1  0    128 174984   8364 14333828    0    0   538     0 24787 41429 56  9
35  1
10  1    128 175436   8372 14335028    0    0   734   358 28829 47777 54  9
36  0
11  0    128 176576   8372 14335220    0    0    92    18 28132 50177 55  8
37  0
 3  0    128 176476   8372 14335288    0    0    34     0 23369 36918 36  6
58  0
 6  0    128 176104   8380 14335556    0    0   134    34 23846 38779 40  6
54  0
 0  0    128 176200   8380 14335784    0    0   114     4 6777 8368 16  1
83  0
procs -----------memory---------- ---swap-- -----io---- -system--
----cpu----
 r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us sy id
wa
 1  0    128 176456   8380 14335456    0    0     0   162 4968 5861 12  1
87  0
 0  0    128 176588   8388 14335520    0    0     0    44  288  282  0  0
100  0
 0  0    128 176752   8388 14335524    0    0     0     2  253  242  0  0
100  0
 0  0    128 176752   8388 14335524    0    0     0     0  286  275  0  0
100  0
 0  0    128 176924   8388 14335524    0    0     0     0  260  250  0  0
100  0

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