fatal error: runtime: out of memory

runtime stack:

runtime.throw(0x70b4a5, 0x16)

/usr/local/go/src/runtime/panic.go:774 +0x72 fp=0x7ffe9d546078 sp=0x7ffe9d546048 pc=0x42ec12

runtime.sysMap(0xc000000000, 0x4000000, 0x95d6d8)

/usr/local/go/src/runtime/mem_linux.go:169 +0xc5 fp=0x7ffe9d5460b8 sp=0x7ffe9d546078 pc=0x419375

runtime.(*mheap).sysAlloc(0x9452c0, 0x2000, 0x0, 0x0)

/usr/local/go/src/runtime/malloc.go:701 +0x1cd fp=0x7ffe9d546160 sp=0x7ffe9d5460b8 pc=0x40c68d

runtime.(*mheap).grow(0x9452c0, 0x1, 0xffffffff)

/usr/local/go/src/runtime/mheap.go:1255 +0xa3 fp=0x7ffe9d5461b0 sp=0x7ffe9d546160 pc=0x4272b3

runtime.(*mheap).allocSpanLocked(0x9452c0, 0x1, 0x95d6e8, 0x1)

/usr/local/go/src/runtime/mheap.go:1170 +0x266 fp=0x7ffe9d546230 sp=0x7ffe9d5461b0 pc=0x427146

runtime.(*mheap).alloc_m(0x9452c0, 0x1, 0x45002a, 0x0)

/usr/local/go/src/runtime/mheap.go:1022 +0xc2 fp=0x7ffe9d546280 sp=0x7ffe9d546230 pc=0x4269e2

runtime.(*mheap).alloc.func1()

/usr/local/go/src/runtime/mheap.go:1093 +0x4c fp=0x7ffe9d5462b8 sp=0x7ffe9d546280 pc=0x456bdc

runtime.(*mheap).alloc(0x9452c0, 0x1, 0x1002a, 0x40000)

/usr/local/go/src/runtime/mheap.go:1092 +0x8a fp=0x7ffe9d546308 sp=0x7ffe9d5462b8 pc=0x426cca

runtime.(*mcentral).grow(0x9460f8, 0x0)

/usr/local/go/src/runtime/mcentral.go:255 +0x7b fp=0x7ffe9d546348 sp=0x7ffe9d546308 pc=0x418d9b

runtime.(*mcentral).cacheSpan(0x9460f8, 0x7f31f72fd000)

/usr/local/go/src/runtime/mcentral.go:106 +0x2fe fp=0x7ffe9d5463a8 sp=0x7ffe9d546348 pc=0x4188be

runtime.(*mcache).refill(0x7f31f72fd008, 0x2a)

/usr/local/go/src/runtime/mcache.go:138 +0x85 fp=0x7ffe9d5463c8 sp=0x7ffe9d5463a8 pc=0x418365

runtime.(*mcache).nextFree(0x7f31f72fd008, 0x95d72a, 0x7f31f72fd008, 0x8, 0xfffffffffffffff8)

/usr/local/go/src/runtime/malloc.go:854 +0x87 fp=0x7ffe9d546400 sp=0x7ffe9d5463c8 pc=0x40ceb7

runtime.mallocgc(0x180, 0x704580, 0x1, 0x95d740)

/usr/local/go/src/runtime/malloc.go:1022 +0x793 fp=0x7ffe9d5464a0 sp=0x7ffe9d546400 pc=0x40d7f3

runtime.newobject(0x704580, 0x4000)

/usr/local/go/src/runtime/malloc.go:1151 +0x38 fp=0x7ffe9d5464d0 sp=0x7ffe9d5464a0 pc=0x40dbe8

runtime.malg(0xf75a700008000, 0x947968)

/usr/local/go/src/runtime/proc.go:3232 +0x31 fp=0x7ffe9d546510 sp=0x7ffe9d5464d0 pc=0x437d71

runtime.mpreinit(...)

/usr/local/go/src/runtime/os_linux.go:324

runtime.mcommoninit(0x93fd80)

/usr/local/go/src/runtime/proc.go:626 +0xc2 fp=0x7ffe9d546548 sp=0x7ffe9d546510 pc=0x4319d2

runtime.schedinit()

/usr/local/go/src/runtime/proc.go:543 +0x72 fp=0x7ffe9d5465a0 sp=0x7ffe9d546548 pc=0x431632

runtime.rt0_go(0x7ffe9d5465d8, 0x5, 0x7ffe9d5465d8, 0x0, 0x7f31f7125c6a, 0x5, 0x7ffe9d548631, 0x7ffe9d548643, 0x7ffe9d548652, 0x7ffe9d54866d, ...)

/usr/local/go/src/runtime/asm_amd64.s:214 +0x125 fp=0x7ffe9d5465a8 sp=0x7ffe9d5465a0 pc=0x458b05

```

用 top命令行一看，KiB Swap为0,free为0

用 free -m 一看，交换分区也为0

增加交换分区

mkdir /swap

cd /swap

sudo dd if=/dev/zero of=swapfile bs=1024 count=2000000

sudo mkswap -f swapfile

.激活 Swap 文件

sudo swapon swapfile

扩展：

如果需要卸载这个 swap 文件，可以进入建立的 swap 文件目录。执行下列命令。

sudo swapoff swapfile

箬需要一直保持这个 swap ，可以把它写入 /etc/fstab 文件。

/swap/swapfile /swap swap defaults 0 0