mirror of https://github.com/postgres/postgres
Bruce Momjian
25 years ago
parent
215b90d3d7
commit
da84545d61
@ -1,81 +0,0 @@ |
||||
This outlines modifications to BSD/OS for running PostgreSQL: |
||||
|
||||
1) How to increase resource limits |
||||
2) How to increase the number of shared memory buffers |
||||
3) How to increasing the number of semaphores |
||||
|
||||
Bruce Momjian (pgman@candle.pha.pa.us) 2000-07-7 |
||||
|
||||
--------------------------------------------------------------------------- |
||||
|
||||
1) To increase the amount of malloc'ed memory and files opened by |
||||
PostgreSQL, add this: |
||||
|
||||
:datasize-cur=256M:\ |
||||
:openfiles-cur=256: |
||||
|
||||
to your /etc/login.conf file. |
||||
|
||||
--------------------------------------------------------------------------- |
||||
|
||||
2a) By default, only 4MB of shared memory is supported by BSDI. Keep in |
||||
mind that shared memory is not pageable. It is locked in RAM. |
||||
|
||||
The shared memory parameters are: |
||||
|
||||
#define SHMMAX /* max shared memory segment size (bytes) */ |
||||
#define SHMMIN /* min shared memory segment size (bytes) */ |
||||
#define SHMMNI /* max number of shared memory identifiers */ |
||||
#define SHMSEG /* max shared memory segments per process */ |
||||
#define SHMALL /* max amount of shared memory (pages) */ |
||||
|
||||
To increase the number of buffers supported by the postmaseter, add the |
||||
following to your kernel config file. A SHMALL value of 1024 |
||||
represents 4MB of shared memory. Increase it accordingly: |
||||
|
||||
options "SHMALL=4096" |
||||
options "SHMMAX=\(SHMALL*PAGE_SIZE\)" |
||||
|
||||
For those running 4.1 or later, just recompile the kernel and reboot. |
||||
For those running earlier releases, see step 2b. |
||||
|
||||
--------------------------------------------------------------------------- |
||||
|
||||
2b) For 4.01 and earlier, use bpatch to find the sysptsize value for |
||||
the current kernel. This is computed dynamically at bootup. |
||||
|
||||
$ bpatch -r sysptsize |
||||
0x9 = 9 |
||||
|
||||
Next, change SYSPTSIZE to a hard-coded value. Use the bpatch value, |
||||
plus add 1 for every additional 4MB of shared memory you desire. |
||||
|
||||
options "SYSPTSIZE=13" |
||||
|
||||
sysptsize can not be changed by sysctl on the fly. |
||||
|
||||
--------------------------------------------------------------------------- |
||||
|
||||
3) How to increasing the number of semaphores. |
||||
|
||||
You may need to increase the number of sysv semaphores. By default, |
||||
PostgreSQL allocates 32 semaphores, one for each backend connection. |
||||
This is just over half the default system total of 60. |
||||
|
||||
The defaults are in /sys/sys/sem.h: |
||||
|
||||
#define SEMMNI 10 /* # of semaphore identifiers */ |
||||
|
||||
#define SEMMNS 60 /* # of semaphores in system */ |
||||
|
||||
#define SEMUME 10 /* max # of undo entries per process */ |
||||
|
||||
#define SEMMNU 30 /* # of undo structures in system */ |
||||
|
||||
Set the values you want in your kernel config file, e.g.: |
||||
|
||||
options "SEMMNI=40" |
||||
options "SEMMNS=240" |
||||
options "SEMUME=40" |
||||
options "SEMMNU=120" |
||||
|
||||
Loading…
Reference in new issue