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Old 10-28-2011, 01:56 PM   #16
rfernandez
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Quote:
Originally Posted by GazL View Post
Seems ok here.
Code:
root@slack:~# ps aux |head -1 ; ps aux |grep [m]igration
USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
root         6  0.0  0.0      0     0 ?        S    09:35   0:00 [migration/0]
root         7  0.0  0.0      0     0 ?        S    09:35   0:00 [migration/1]
Here's what happening

Code:
$ ps aux | head -n 1 ; ps aux | grep [m]igration
USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
root         6  0.0  0.0      0     0 ?        S    12:50   0:00 [migration/0]
root         8  0.0  0.0      0     0 ?        S    12:50   0:00 [migration/1]
root        13  0.0  0.0      0     0 ?        S    12:50   0:00 [migration/2]
root        17 93.2  0.0      0     0 ?        S    12:50 234:51 [migration/3]
But Total CPU is really <10%, right now.
 
Old 10-28-2011, 03:36 PM   #17
GazL
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Don't forget that the total is the percentage total across all 4 cpu, so 10% is a significant amount on a quad cpu box.

The %CPU figure from the 'ps;' command expresses as a percentage for each task the cpu time used / elapsed time of that task. It's not a snapshot of the current usage.

Can you post the output of a 'sar -P ALL 10 6' That'll give us a better understanding of what your real usage is.
 
Old 10-28-2011, 06:04 PM   #18
rfernandez
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Sure thing.

Code:
$ sar -P ALL 10 6
Linux 3.1.0 (darkstar)  10/28/2011      _x86_64_        (4 CPU)

09:08:11 PM     CPU     %user     %nice   %system   %iowait    %steal     %idle
09:08:21 PM     all      4.23      0.00      2.50      0.23      0.00     93.05
09:08:21 PM       0      5.30      0.00      3.00      0.80      0.00     90.90
09:08:21 PM       1      4.00      0.00      2.60      0.00      0.00     93.40
09:08:21 PM       2      5.00      0.00      2.60      0.00      0.00     92.40
09:08:21 PM       3      2.61      0.00      1.81      0.00      0.00     95.58

09:08:21 PM     CPU     %user     %nice   %system   %iowait    %steal     %idle
09:08:31 PM     all      4.55      0.00      2.40      0.13      0.00     92.92
09:08:31 PM       0      5.71      0.00      2.70      0.60      0.00     90.99
09:08:31 PM       1      4.70      0.00      2.80      0.00      0.00     92.49
09:08:31 PM       2      4.60      0.00      2.60      0.00      0.00     92.80
09:08:31 PM       3      3.19      0.00      1.60      0.00      0.00     95.21

09:08:31 PM     CPU     %user     %nice   %system   %iowait    %steal     %idle
09:08:41 PM     all      2.90      0.00      1.88      0.38      0.00     94.84
09:08:41 PM       0      3.41      0.00      1.91      1.10      0.00     93.57
09:08:41 PM       1      2.40      0.00      1.30      0.00      0.00     96.30
09:08:41 PM       2      3.90      0.00      2.10      0.50      0.00     93.51
09:08:41 PM       3      2.00      0.00      2.20      0.00      0.00     95.80
                                                                                                                                                  
09:08:41 PM     CPU     %user     %nice   %system   %iowait    %steal     %idle                                                                   
09:08:51 PM     all      7.30      0.00      3.35      0.12      0.00     89.23
09:08:51 PM       0     10.16      0.00      4.78      0.30      0.00     84.76
09:08:51 PM       1      5.70      0.00      3.10      0.00      0.00     91.20
09:08:51 PM       2      7.31      0.00      3.40      0.00      0.00     89.29
09:08:51 PM       3      5.92      0.00      2.11      0.20      0.00     91.78

09:08:51 PM     CPU     %user     %nice   %system   %iowait    %steal     %idle
09:09:01 PM     all      6.32      0.00      2.97      0.30      0.00     90.40
09:09:01 PM       0      8.72      0.00      3.71      1.10      0.00     86.47
09:09:01 PM       1      5.30      0.00      2.60      0.00      0.00     92.10
09:09:01 PM       2      7.51      0.00      3.40      0.00      0.00     89.09
09:09:01 PM       3      3.70      0.00      2.10      0.00      0.00     94.20
meanwhile

Code:
$ ps aux | head -n 1 ; ps aux | grep [m]igration
USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
root         6 53.5  0.0      0     0 ?        S    12:50 267:14 [migration/0]
root     27128  0.0  0.0      0     0 ?        S    20:57   0:00 [migration/1]
root     27132  0.0  0.0      0     0 ?        S    20:57   0:00 [migration/2]
root     27136  0.0  0.0      0     0 ?        S    20:57   0:00 [migration/3]
 
Old 10-28-2011, 06:54 PM   #19
GazL
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Well, that wasn't exactly what I expected. I was expecting each of those migration threads to be bound to an individual cpu with one doing all the work, which is clearly not the case from those stats.

I still think that cpu usage is a little high for an idle system, but I don't have a clue what's going on here or why that migration thread is registering so much activity.
 
Old 10-28-2011, 07:27 PM   #20
rfernandez
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And that's why it's funny: it only register a high CPU usage but, in reality, there's no high cpu usage - the system is very quiet and calm.
 
Old 10-29-2011, 12:34 AM   #21
rfernandez
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Right now, this is even weird:

Code:
$ ps aux | grep [m]igration
root         6 70.8  0.0      0     0 ?        S    Oct28 629:05 [migration/0]
root     27128  0.0  0.0      0     0 ?        S    Oct28   0:00 [migration/1]
root     27132 29.7  0.0      0     0 ?        S    Oct28 118:57 [migration/2]
root     27136 74.0  0.0      0     0 ?        S    Oct28 296:19 [migration/3]
and

Code:
$ sar -P ALL 10 6
Linux 3.1.0 (darkstar)  10/29/2011      _x86_64_        (4 CPU)

03:38:33 AM     CPU     %user     %nice   %system   %iowait    %steal     %idle
03:38:43 AM     all      6.47      0.00      3.11      0.38      0.00     90.05
03:38:43 AM       0      9.75      0.00      3.22      1.51      0.00     85.53
03:38:43 AM       1      5.52      0.00      3.21      0.00      0.00     91.27
03:38:43 AM       2      7.11      0.00      3.51      0.00      0.00     89.38
03:38:43 AM       3      3.52      0.00      2.21      0.00      0.00     94.27

03:38:43 AM     CPU     %user     %nice   %system   %iowait    %steal     %idle
03:38:53 AM     all      3.00      0.00      2.12      0.40      0.00     94.48
03:38:53 AM       0      4.09      0.00      2.39      1.60      0.00     91.92
03:38:53 AM       1      3.00      0.00      1.70      0.00      0.00     95.30
03:38:53 AM       2      2.30      0.00      2.40      0.00      0.00     95.30
03:38:53 AM       3      2.69      0.00      2.09      0.00      0.00     95.21

03:38:53 AM     CPU     %user     %nice   %system   %iowait    %steal     %idle
03:39:03 AM     all      1.83      0.00      1.28      0.23      0.00     96.67
03:39:03 AM       0      1.50      0.00      0.90      0.90      0.00     96.70
03:39:03 AM       1      1.40      0.00      0.90      0.00      0.00     97.70
03:39:03 AM       2      2.40      0.00      1.50      0.00      0.00     96.10
03:39:03 AM       3      2.01      0.00      1.91      0.00      0.00     96.08

03:39:03 AM     CPU     %user     %nice   %system   %iowait    %steal     %idle
03:39:13 AM     all      2.50      0.00      1.75      0.10      0.00     95.65
03:39:13 AM       0      2.91      0.00      1.60      0.30      0.00     95.19
03:39:13 AM       1      2.50      0.00      1.80      0.00      0.00     95.70
03:39:13 AM       2      2.60      0.00      2.10      0.00      0.00     95.30
03:39:13 AM       3      1.90      0.00      1.70      0.00      0.00     96.39
                                                                                                                                                  
03:39:13 AM     CPU     %user     %nice   %system   %iowait    %steal     %idle                                                                   
03:39:23 AM     all      2.40      0.00      1.72      0.20      0.00     95.68
03:39:23 AM       0      3.10      0.00      2.30      0.80      0.00     93.81
03:39:23 AM       1      1.90      0.00      1.40      0.00      0.00     96.71
03:39:23 AM       2      2.50      0.00      1.90      0.00      0.00     95.60
03:39:23 AM       3      2.19      0.00      1.09      0.00      0.00     96.72
once again

Code:
$ ps aux | grep [m]igration
root         6 70.7  0.0      0     0 ?        S    Oct28 629:05 [migration/0]
root     27128  0.0  0.0      0     0 ?        S    Oct28   0:00 [migration/1]
root     27132 29.6  0.0      0     0 ?        S    Oct28 118:57 [migration/2]
root     27136 73.7  0.0      0     0 ?        S    Oct28 296:19 [migration/3]
 
Old 10-29-2011, 04:03 AM   #22
Petri Kaukasoina
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Quote:
Originally Posted by rfernandez View Post
Everything is looking good, but does anyone see the migragtion/x using up to 90% CPU?
What kind of system is it? If it is a NUMA system, do you have CONFIG_NUMA set?
 
Old 10-29-2011, 04:11 AM   #23
rfernandez
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I don't know what NUMA is, so as in the kernel config: # CONFIG_NUMA is not set.

The machine is a Dell Inspiron N5010 with Intel Core i5.
 
Old 10-29-2011, 04:27 AM   #24
Petri Kaukasoina
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Quote:
Originally Posted by rfernandez View Post
I don't know what NUMA is, so as in the kernel config: # CONFIG_NUMA is not set.

The machine is a Dell Inspiron N5010 with Intel Core i5.
OK, that's not the problem then.
 
  


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