Postgresql FATAL: could not create semaphores: No space left on device
昨天安装完成pg 9.5后,启动报错:
#ipcs -lm
------ Shared Memory Limits --------
max number of segments =
max seg size (kbytes) =
max total shared memory (kbytes) =
min seg size (bytes) =
#cat /proc/sys/kernel/shmmax
SHMMAX 单个共享内存段最大字节数
# cat /proc/sys/kernel/shmmni
SHMMNI 共享内存段最大个数
# cat /proc/sys/kernel/shmall
SHMALL系统中共享内存也总数,至少为ceil(shmmax/PAGE_SIZE)
# getconf PAGE_SIZE
可以根据实际情况修改以上参数值,在/etc/sysctl.conf配置文件中
# ipcs -ls ------ Semaphore Limits --------
max number of arrays =
max semaphores per array =
max semaphores system wide =
max ops per semop call =
semaphore max value = # cat /proc/sys/kernel/sem
SEMMSL SEMMNS SEMOPM SEMMNI
Name | Description | Reasonable values |
---|---|---|
SHMMAX | Maximum size of shared memory segment (bytes) | at least 1kB (more if running many copies of the server) |
SHMMIN | Minimum size of shared memory segment (bytes) | 1 |
SHMALL | Total amount of shared memory available (bytes or pages) | if bytes, same as SHMMAX; if pages, ceil(SHMMAX/PAGE_SIZE) |
SHMSEG | Maximum number of shared memory segments per process | only 1 segment is needed, but the default is much higher |
SHMMNI | Maximum number of shared memory segments system-wide | like SHMSEG plus room for other applications |
SEMMNI | Maximum number of semaphore(打旗语) identifiers (i.e., sets) | at least ceil((max_connections + autovacuum_max_workers + max_worker_processes + 5) / 16) |
SEMMNS | Maximum number of semaphores system-wide | ceil((max_connections + autovacuum_max_workers + max_worker_processes + 5) / 16) * 17 plus room for other applications |
SEMMSL | Maximum number of semaphores(信号) per set | at least 17 |
SEMMAP | Number of entries in semaphore map | see text |
SEMVMX | Maximum value of semaphore | at least 1000 (The default is often 32767; do not change unless necessary) |
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