Re: MySQL 8.0: InnoDB: mmap failed; errno 12
Posted by:
Sujith S
Date: October 06, 2018 10:46PM
my.cnf
[mysqld]
#innodb_buffer_pool_size=100G
#innodb_buffer_pool_instances=16
#innodb_buffer_pool_chunk_size=256M
innodb_dedicated_server = ON
log_error_verbosity=3
datadir=/home/test/mysql
socket=/home/test/mysql/mysql.sock
log-error=/home/test/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid
[client]
socket=/home/test/mysql/mysql.sock
free -m
total used free shared buff/cache available
Mem: 257417 2103 254891 10 422 254402
Swap: 4095 0 4095
Meanwhile I checked the code a bit. I think failure happens at
storage/innobase/os/os0proc.cc:150
ptr = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_PRIVATE | OS_MAP_ANON, -1,
0);
if (UNIV_UNLIKELY(ptr == (void *)-1)) {
ib::error(ER_IB_MSG_856) << "mmap(" << size
<< " bytes) failed;"
" errno "
<< errno;
ptr = NULL;
}
I wrote a test program with same code, which will mmap 1GB chunks. That always fails at around 130 GB. mysqld also fails around that range. This problem could be related to the OS too. But I am not sure what it is.
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