MMAP收益不能分配的内存,即使有足够的 [英] mmap returns can not allocate memory, even though there is enough
问题描述
我执行与性LevelDB一个pressure测试。
在 UTIL / env_poisx.cc:NewRandomAccessFile()
无效*基地= MMAP(NULL,大小,PROT_READ,MAP_SHARED,FD,0);
经过3万条数据(每100K)插入。该错误号说无法分配内存
。
为什么?
更多细节:
顶:
PID USER PR NI VIRT RES SHR S%CPU%MEM TIME + COMMAND
19794根20 0290克4.9克4.7克小号98.6 7.8 2348:00六味地黄丸
免费-m:
共免费使用共享缓冲区高速缓存纪念品:64350 60623 3726 0 179 59353 - / +缓冲区/缓存:1090 63259掉期:996 0 996
的ulimit -a:
核心转储文件大小(块,-c)无限
数据赛格大小(千字节,-d)无限
文件大小(块,-f)无限
挂起信号(-i)1024
最大锁定内存(千字节,-l)32
最大内存大小(千字节,-m)无限
打开文件(-n)10240
管道尺寸(512字节,-p)8
POSIX消息队列(字节,-q)819200
堆栈大小(千字节,-S)10240
CPU时间(秒,-t)无限
最大用户进程(-u)530432
虚拟内存(千字节,-v)无限
文件锁(-x)无限
sysctl的:
vm.max_map_count = 300000
kernel.shmmni = 8092
kernel.shmall = 4194304
kernel.shmmax = 2147483648
男人MMAP:
ENOMEM没有可用的内存,或者进程的映射的最大数量会被超越。
当你写3.万条数据(每10万),这似乎与vm.max_map_count关联为300000。
尝试,如果你确定你有足够的内存来更改此限制。
请给的/ proc / [PID] /地图|当错误发生的厕所-l
I'm performing a pressure test with leveldb.
In util/env_poisx.cc : NewRandomAccessFile()
void* base = mmap(NULL, size, PROT_READ, MAP_SHARED, fd, 0);
after 3 million data (each 100k) insert. The errno says Cannot allocate memory
.
why?
More details:
top:
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
19794 root 20 0 290g 4.9g 4.7g S 98.6 7.8 2348:00 ldb
free -m:
total used free shared buffers cached
Mem: 64350 60623 3726 0 179 59353
-/+ buffers/cache: 1090 63259
Swap: 996 0 996
ulimit -a:
core file size (blocks, -c) unlimited
data seg size (kbytes, -d) unlimited
file size (blocks, -f) unlimited
pending signals (-i) 1024
max locked memory (kbytes, -l) 32
max memory size (kbytes, -m) unlimited
open files (-n) 10240
pipe size (512 bytes, -p) 8
POSIX message queues (bytes, -q) 819200
stack size (kbytes, -s) 10240
cpu time (seconds, -t) unlimited
max user processes (-u) 530432
virtual memory (kbytes, -v) unlimited
file locks (-x) unlimited
sysctl:
vm.max_map_count = 300000
kernel.shmmni = 8092
kernel.shmall = 4194304
kernel.shmmax = 2147483648
man mmap:
"ENOMEM No memory is available, or the process's maximum number of mappings would have been exceeded."
When you write "3 million data (each 100k)", it seems to correlate with vm.max_map_count is 300000. Try to change this limit if you sure you have enough memory.
Please give /proc/[pid]/maps | wc -l when error happening
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