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Re: Memory issues

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Hi
I've returned the memory configs to the default, erased data from my db and am testing the system again.

This is the output of cat /proc/meminfo
Thanks

root@ip-10-194-167-240:~# cat /proc/meminfo
MemTotal:        7629508 kB
MemFree:          170368 kB
Buffers:           10272 kB
Cached:          6220848 kB
SwapCached:            0 kB
Active:          3249748 kB
Inactive:        3936960 kB
Active(anon):     971336 kB
Inactive(anon):  2103844 kB
Active(file):    2278412 kB
Inactive(file):  1833116 kB
Unevictable:           0 kB
Mlocked:               0 kB
SwapTotal:        524284 kB
SwapFree:         522716 kB
Dirty:             83068 kB
Writeback:          3080 kB
AnonPages:        955856 kB
Mapped:          2132564 kB
Shmem:           2119424 kB
Slab:             157200 kB
SReclaimable:     144488 kB
SUnreclaim:        12712 kB
KernelStack:        1184 kB
PageTables:        21092 kB
NFS_Unstable:          0 kB
Bounce:                0 kB
WritebackTmp:          0 kB
CommitLimit:     4339036 kB
Committed_AS:    3637424 kB
VmallocTotal:   34359738367 kB
VmallocUsed:       26152 kB
VmallocChunk:   34359710052 kB
HardwareCorrupted:     0 kB
AnonHugePages:         0 kB
HugePages_Total:       0
HugePages_Free:        0
HugePages_Rsvd:        0
HugePages_Surp:        0
Hugepagesize:       2048 kB
DirectMap4k:     7872512 kB
DirectMap2M:           0 kB


On Thu, Sep 27, 2012 at 8:59 AM, Andres Freund <andres@xxxxxxxxxxxxxxx> wrote:
On Monday, September 24, 2012 08:45:06 AM Shiran Kleiderman wrote:
> Hi,
> I'm using and Amazon ec2 instance with the following spec and the
> application that I'm running uses a postgres DB 9.1.
> The app has 3 main cron jobs.
>
> *Ubuntu 12, High-Memory Extra Large Instance
> 17.1 GB of memory
> 6.5 EC2 Compute Units (2 virtual cores with 3.25 EC2 Compute Units each)
> 420 GB of instance storage
> 64-bit platform*
>
> I've changed the main default values under file *postgresql.conf* to:
> shared_buffers = 4GB
> work_mem = 16MB
> wal_buffers = 16MB
> checkpoint_segments = 32
> effective_cache_size = 8GB
>
> When I run the app, after an hour or two, free -m looks like below ans the
> crons can't run due to memory loss or similar (i'm new to postgres and db
> admin).
> Thanks!
>
> free -m, errors:
>
> total used free shared buffers cached
> Mem: 17079 13742 3337 0 64 11882
> -/+ buffers/cache: 1796 15283
> Swap: 511 0 511
>
> total used *free* shared buffers cached
> Mem: 17079 16833 *245 *0 42 14583
> -/+ buffers/cache: 2207 14871
> Swap: 511 0 511
>
> **free above stays low even when nothing is running.
>
> **errors:
> *DBI connect('database=---;host=localhost','postgres',...) failed: could
> not fork new process for connection: Cannot allocate memory*
> could not fork new process for connection: Cannot allocate memory
>
> and
> execute failed: ERROR: out of memory
> DETAIL: Failed on request of size 968. [for Statement "
> SELECT DISTINCT....
could you show cat /proc/meminfo?

Greetings,

Andres
--
 Andres Freund                     http://www.2ndQuadrant.com/
 PostgreSQL Development, 24x7 Support, Training & Services



--
Best,
Shiran Kleiderman
+972  - 542380838
Skype - shirank1


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