On 04/28/2012 10:32 AM, Fernando Hevia wrote:
On Sat, Apr 28, 2012 at 13:10, Kevin Kempter
<cs_...@consistentstate.com <mailto:cs_...@consistentstate.com>> wrote:
All;
I just want to be sure that I'm not causing myself greif. I have
a kvm in the cloud that is supposed to have access to 32GB of ram.
when I do a top I only see 1GB of ram, I've pinged the hosting
provider, maybe it shows up as it's used?
What does the 'free' command show?
Anyway when I try and start postgres I see this:
/
$ 2012-04-28 12:00:33 EDT [6429]: [1-1] FATAL: XX000: could not
create shared memory segment: Cannot allocate memory
2012-04-28 12:00:33 EDT [6429]: [2-1] DETAIL: Failed system call
was shmget(key=5432001, size=7700914176, 03600).
2012-04-28 12:00:33 EDT [6429]: [3-1] HINT: This error usually
means that PostgreSQL's request for a shared memory segment
exceeded available memory or swap space. To reduce the request
size (currently 7700914176 bytes), reduce PostgreSQL's
shared_buffers parameter (currently 917504) and/or its
max_connections parameter (currently 503).
The PostgreSQL documentation contains more information
about shared memory configuration.
2012-04-28 12:00:33 EDT [6429]: [4-1] LOCATION:
InternalIpcMemoryCreate, pg_shmem.c:178 /
Which means I should bump up shmmax like this:
/# sysctl -w kernel.shmmax=7700914176/
and add it to /etc/sysctl.conf:
/# tail /etc/sysctl.conf
kernel.msgmax = 65536
# Controls the maximum shared segment size, in bytes
kernel.shmmax = 68719476736
# Controls the maximum number of shared memory segments, in pages
kernel.shmall = 4294967296
#PostgreSQL
kernel.shmmax = 7700914176 /
I assume I should have to tweak ONLY kernel.shmmax, am I correct?
Correct.
I'm also assuming that this is a KVM cloud host provider issue,
i.e. it looks like I actually do not have 32G or ram. Does anyone
disagree with my conclusions?
You haven't provided evidence on how much RAM your system sees. A free
-m will show the total memory the system has and is being used.
Regards.
Free command:
/ # free
total used free shared buffers cached
Mem: 1020856 946804 74052 0 61280 796004
-/+ buffers/cache: 89520 931336
Swap: 0 0 0/
