[PERFORM] Multi processor server overloads occationally with system process while running postgresql-9.4

2015-10-03 Thread ajaykbs 
I am working in a public company who uses only open source applications and
databases.I have a problem with our critical database which is write and
read intensive.*version:* Postgresql-9.4*Hardware:* HP DL980 (8-processor,
80 cores w/o hyper threading, 512GB RAM)*Operating system: *Red Hat
Enterprise Linux Server release 6.4 (Santiago)*uname -a* : Linux host1
2.6.32-358.el6.x86_64 #1 SMP Tue Jan 29 11:47:41 EST 2013 x86_64 x86_64
x86_64 GNU/LinuxSingle database with separate tablespace for main-data,
pg_xlog and indexesI have a database having 770GB size and expected to grow
to 2TB within the next year.The database was running in a 2processor HP
DL560 (16 cores) and as the transactions of the database were found
increasing, we have changed the hardware to DL980 with 8 processors and
512GB RAM. *Problem* It is observed that at some times during moderate load
the CPU usage goes up to 400% and the users are not able to complete the
queries in expected time. But the load is contributed by some system process
only.The average connections are normally 50. But when this happens the
connections will shoot up to max-connections.*The sar command
output*07:20:01  IST CPU %user %nice   %system   %iowait   
%steal %idle07:30:01  IST all  0.73  0.00  0.37 
0.58  0.00 98.3307:40:01  IST all  0.66  0.00  0.38 
0.65  0.00 98.3107:50:01  IST all  0.27  0.00  0.27 
0.01  0.00 99.4508:00:01  IST all  0.52  0.00  0.37 
0.01  0.00 99.1008:10:01  IST all  1.54  0.00  0.70 
0.02  0.00 97.7408:20:01  IST all  1.20  0.00  0.67 
0.02  0.00 98.1008:30:01  IST all  1.48  0.00  0.77 
0.03  0.00 97.7208:40:01  IST all  1.69  0.00  0.89 
0.04  0.00 97.3908:50:01  IST all  1.71  0.00  0.94 
0.04  0.00 97.3109:00:01  IST all  1.74  0.00  0.92 
0.03  0.00 97.3109:10:01  IST all  2.32  0.00  1.06 
0.04  0.00 96.5809:20:01  IST all  2.22  0.00  1.17 
0.04  0.00 96.5709:30:02  IST all  2.20  0.00  6.68 
0.06  0.00 91.0609:40:01  IST all  2.43  0.00  1.37 
0.06  0.00 96.1409:50:01  IST all  3.23  0.00  2.06 
0.08  0.00 94.6310:00:02  IST all  3.15  0.00  6.10 
0.07  0.00 90.6710:10:01  IST all  4.94  0.00  5.20 
0.29  0.00 89.5710:20:01  IST all  5.10  0.00  2.13 
0.34  0.00 92.4310:30:01  IST all  5.60  0.00  2.42 
0.18  0.00 91.8010:40:01  IST all  5.28  0.00 14.37 
0.19  0.00 80.1610:50:01  IST all  4.52  0.00 28.48 
0.23  0.00 66.7711:00:01  IST all  5.25  0.00  9.02 
0.18  0.00 85.5511:10:01  IST all  5.77  0.00  4.96 
0.27  0.00 89.0011:20:01  IST all  5.70  0.00  2.74 
0.19  0.00 91.3711:30:01  IST all  5.72  0.00  5.91 
0.20  0.00 88.1711:40:01  IST all  5.66  0.00  2.81 
0.37  0.00 91.1511:50:01  IST all  5.90  0.00  8.80 
0.10  0.00 85.1912:00:01  IST all  6.44  0.00  3.40 
0.13  0.00 90.0312:10:01  IST all  7.18  0.00  4.52 
0.11  0.00 88.1812:20:02  IST all  4.40  0.00 37.84 
0.07  0.00 57.7012:30:01  IST all  5.66  0.00  2.98 
0.10  0.00 91.2612:40:01  IST all  5.74  0.00  3.05 
0.11  0.00 91.10Average:all  1.92  0.00  2.28 
0.11  0.00 95.69Postgresql.confmax_connections = 500 (can be
reduced)shared_buffers = 8500MBwork_mem = 50MBmaintenance_work_mem =
8064MBcheckpoint_segments = 132checkpoint_timeout =
30mincheckpoint_completion_target = 0.9 This over load happens 5-6 times a
day.How to trace the cause of this problem?. My thoughts.1. some thing
related to the numa systems memory management.2. Some thing related to the
size of shared buffers.Please helpAjayakumar.BS



--
View this message in context: 
http://postgresql.nabble.com/Multi-processor-server-overloads-occationally-with-system-process-while-running-postgresql-9-4-tp5868474.html
Sent from the PostgreSQL - performance mailing list archive at Nabble.com.

Re: [PERFORM] Multi processor server overloads occationally with system process while running postgresql-9.4

2015-10-03 Thread Andres Freund 
On 2015-10-03 01:39:33 -0700, ajaykbs wrote:
> It is observed that at some times during moderate load
> the CPU usage goes up to 400% and the users are not able to complete the
> queries in expected time. But the load is contributed by some system process
> only.The average connections are normally 50.

This email is nearly impossible to read.

But it sounds a bit like you need to disable transparent hugepages
and/or zone_reclaim mode.

Greetings,

Andres Freund


-- 
Sent via pgsql-performance mailing list (pgsql-performance@postgresql.org)
To make changes to your subscription:
http://www.postgresql.org/mailpref/pgsql-performance

Re: [PERFORM] Multi processor server overloads occationally with system process while running postgresql-9.4

2015-10-03 Thread Gavin Flower 

On 03/10/15 21:39, ajaykbs wrote:
I am working in a public company who uses only open source 
applications and databases. I have a problem with our critical 
database which is write and read intensive. *version:* Postgresql-9.4 
*Hardware:* HP DL980 (8-processor, 80 cores w/o hyper threading, 512GB 
RAM) *Operating system: *Red Hat Enterprise Linux Server release 6.4 
(Santiago) *uname -a* : Linux host1 2.6.32-358.el6.x86_64 #1 SMP Tue 
Jan 29 11:47:41 EST 2013 x86_64 x86_64 x86_64 GNU/Linux Single 
database with separate tablespace for main-data, pg_xlog and indexes I 
have a database having 770GB size and expected to grow to 2TB within 
the next year. The database was running in a 2processor HP DL560 (16 
cores) and as the transactions of the database were found increasing, 
we have changed the hardware to DL980 with 8 processors and 512GB RAM. 
*Problem* It is observed that at some times during moderate load the 
CPU usage goes up to 400% and the users are not able to complete the 
queries in expected time. But the load is contributed by some system 
process only. The average connections are normally 50. But when this 
happens the connections will shoot up to max-connections. *The sar 
command output* 07:20:01 IST CPU %user %nice %system %iowait %steal 
%idle 07:30:01 IST all 0.73 0.00 0.37 0.58 0.00 98.33 07:40:01 IST all 
0.66 0.00 0.38 0.65 0.00 98.31 07:50:01 IST all 0.27 0.00 0.27 0.01 
0.00 99.45 08:00:01 IST all 0.52 0.00 0.37 0.01 0.00 99.10 08:10:01 
IST all 1.54 0.00 0.70 0.02 0.00 97.74 08:20:01 IST all 1.20 0.00 0.67 
0.02 0.00 98.10 08:30:01 IST all 1.48 0.00 0.77 0.03 0.00 97.72 
08:40:01 IST all 1.69 0.00 0.89 0.04 0.00 97.39 08:50:01 IST all 1.71 
0.00 0.94 0.04 0.00 97.31 09:00:01 IST all 1.74 0.00 0.92 0.03 0.00 
97.31 09:10:01 IST all 2.32 0.00 1.06 0.04 0.00 96.58 09:20:01 IST all 
2.22 0.00 1.17 0.04 0.00 96.57 09:30:02 IST all 2.20 0.00 6.68 0.06 
0.00 91.06 09:40:01 IST all 2.43 0.00 1.37 0.06 0.00 96.14 09:50:01 
IST all 3.23 0.00 2.06 0.08 0.00 94.63 10:00:02 IST all 3.15 0.00 6.10 
0.07 0.00 90.67 10:10:01 IST all 4.94 0.00 5.20 0.29 0.00 89.57 
10:20:01 IST all 5.10 0.00 2.13 0.34 0.00 92.43 10:30:01 IST all 5.60 
0.00 2.42 0.18 0.00 91.80 10:40:01 IST all 5.28 0.00 14.37 0.19 0.00 
80.16 10:50:01 IST all 4.52 0.00 28.48 0.23 0.00 66.77 11:00:01 IST 
all 5.25 0.00 9.02 0.18 0.00 85.55 11:10:01 IST all 5.77 0.00 4.96 
0.27 0.00 89.00 11:20:01 IST all 5.70 0.00 2.74 0.19 0.00 91.37 
11:30:01 IST all 5.72 0.00 5.91 0.20 0.00 88.17 11:40:01 IST all 5.66 
0.00 2.81 0.37 0.00 91.15 11:50:01 IST all 5.90 0.00 8.80 0.10 0.00 
85.19 12:00:01 IST all 6.44 0.00 3.40 0.13 0.00 90.03 12:10:01 IST all 
7.18 0.00 4.52 0.11 0.00 88.18 12:20:02 IST all 4.40 0.00 37.84 0.07 
0.00 57.70 12:30:01 IST all 5.66 0.00 2.98 0.10 0.00 91.26 12:40:01 
IST all 5.74 0.00 3.05 0.11 0.00 91.10 Average: all 1.92 0.00 2.28 
0.11 0.00 95.69 Postgresql.conf max_connections = 500 (can be reduced) 
shared_buffers = 8500MB work_mem = 50MB maintenance_work_mem = 8064MB 
checkpoint_segments = 132 checkpoint_timeout = 30min 
checkpoint_completion_target = 0.9 This over load happens 5-6 times a 
day. How to trace the cause of this problem?. My thoughts. 1. some 
thing related to the numa systems memory management. 2. Some thing 
related to the size of shared buffers. Please help Ajayakumar.BS


View this message in context: Multi processor server overloads 
occationally with system process while running postgresql-9.4 

Sent from the PostgreSQL - performance mailing list archive 
 at 
Nabble.com.
A little bit of formatting might make the above a bit more readable...  
One paragraph is hard to parse.



-Gavin


--
Sent via pgsql-performance mailing list (pgsql-performance@postgresql.org)
To make changes to your subscription:
http://www.postgresql.org/mailpref/pgsql-performance

Re: [PERFORM] Multi processor server overloads occationally with system process while running postgresql-9.4

2015-10-03 Thread Wei Shan 
Are you using any connection pooler in front of the database?
On 3 Oct 2015 17:04, "Gavin Flower"  wrote:

> On 03/10/15 21:39, ajaykbs wrote:
>
>> I am working in a public company who uses only open source applications
>> and databases. I have a problem with our critical database which is write
>> and read intensive. *version:* Postgresql-9.4 *Hardware:* HP DL980
>> (8-processor, 80 cores w/o hyper threading, 512GB RAM) *Operating system:
>> *Red Hat Enterprise Linux Server release 6.4 (Santiago) *uname -a* : Linux
>> host1 2.6.32-358.el6.x86_64 #1 SMP Tue Jan 29 11:47:41 EST 2013 x86_64
>> x86_64 x86_64 GNU/Linux Single database with separate tablespace for
>> main-data, pg_xlog and indexes I have a database having 770GB size and
>> expected to grow to 2TB within the next year. The database was running in a
>> 2processor HP DL560 (16 cores) and as the transactions of the database were
>> found increasing, we have changed the hardware to DL980 with 8 processors
>> and 512GB RAM. *Problem* It is observed that at some times during moderate
>> load the CPU usage goes up to 400% and the users are not able to complete
>> the queries in expected time. But the load is contributed by some system
>> process only. The average connections are normally 50. But when this
>> happens the connections will shoot up to max-connections. *The sar command
>> output* 07:20:01 IST CPU %user %nice %system %iowait %steal %idle 07:30:01
>> IST all 0.73 0.00 0.37 0.58 0.00 98.33 07:40:01 IST all 0.66 0.00 0.38 0.65
>> 0.00 98.31 07:50:01 IST all 0.27 0.00 0.27 0.01 0.00 99.45 08:00:01 IST all
>> 0.52 0.00 0.37 0.01 0.00 99.10 08:10:01 IST all 1.54 0.00 0.70 0.02 0.00
>> 97.74 08:20:01 IST all 1.20 0.00 0.67 0.02 0.00 98.10 08:30:01 IST all 1.48
>> 0.00 0.77 0.03 0.00 97.72 08:40:01 IST all 1.69 0.00 0.89 0.04 0.00 97.39
>> 08:50:01 IST all 1.71 0.00 0.94 0.04 0.00 97.31 09:00:01 IST all 1.74 0.00
>> 0.92 0.03 0.00 97.31 09:10:01 IST all 2.32 0.00 1.06 0.04 0.00 96.58
>> 09:20:01 IST all 2.22 0.00 1.17 0.04 0.00 96.57 09:30:02 IST all 2.20 0.00
>> 6.68 0.06 0.00 91.06 09:40:01 IST all 2.43 0.00 1.37 0.06 0.00 96.14
>> 09:50:01 IST all 3.23 0.00 2.06 0.08 0.00 94.63 10:00:02 IST all 3.15 0.00
>> 6.10 0.07 0.00 90.67 10:10:01 IST all 4.94 0.00 5.20 0.29 0.00 89.57
>> 10:20:01 IST all 5.10 0.00 2.13 0.34 0.00 92.43 10:30:01 IST all 5.60 0.00
>> 2.42 0.18 0.00 91.80 10:40:01 IST all 5.28 0.00 14.37 0.19 0.00 80.16
>> 10:50:01 IST all 4.52 0.00 28.48 0.23 0.00 66.77 11:00:01 IST all 5.25 0.00
>> 9.02 0.18 0.00 85.55 11:10:01 IST all 5.77 0.00 4.96 0.27 0.00 89.00
>> 11:20:01 IST all 5.70 0.00 2.74 0.19 0.00 91.37 11:30:01 IST all 5.72 0.00
>> 5.91 0.20 0.00 88.17 11:40:01 IST all 5.66 0.00 2.81 0.37 0.00 91.15
>> 11:50:01 IST all 5.90 0.00 8.80 0.10 0.00 85.19 12:00:01 IST all 6.44 0.00
>> 3.40 0.13 0.00 90.03 12:10:01 IST all 7.18 0.00 4.52 0.11 0.00 88.18
>> 12:20:02 IST all 4.40 0.00 37.84 0.07 0.00 57.70 12:30:01 IST all 5.66 0.00
>> 2.98 0.10 0.00 91.26 12:40:01 IST all 5.74 0.00 3.05 0.11 0.00 91.10
>> Average: all 1.92 0.00 2.28 0.11 0.00 95.69 Postgresql.conf max_connections
>> = 500 (can be reduced) shared_buffers = 8500MB work_mem = 50MB
>> maintenance_work_mem = 8064MB checkpoint_segments = 132 checkpoint_timeout
>> = 30min checkpoint_completion_target = 0.9 This over load happens 5-6 times
>> a day. How to trace the cause of this problem?. My thoughts. 1. some thing
>> related to the numa systems memory management. 2. Some thing related to the
>> size of shared buffers. Please help Ajayakumar.BS
>> 
>> View this message in context: Multi processor server overloads
>> occationally with system process while running postgresql-9.4 <
>> http://postgresql.nabble.com/Multi-processor-server-overloads-occationally-with-system-process-while-running-postgresql-9-4-tp5868474.html
>> >
>> Sent from the PostgreSQL - performance mailing list archive <
>> http://postgresql.nabble.com/PostgreSQL-performance-f2050081.html> at
>> Nabble.com.
>>
> A little bit of formatting might make the above a bit more readable...
> One paragraph is hard to parse.
>
>
> -Gavin
>
>
> --
> Sent via pgsql-performance mailing list (pgsql-performance@postgresql.org)
> To make changes to your subscription:
> http://www.postgresql.org/mailpref/pgsql-performance
>