mmap error : cannot allocate memory. how to allocate enough default sized huge pages as admin?

Question

我正在编译运行 this 程序但收到了 'mmap error : cannot allocate memory'。顶部的评论是

/*
 * Example of using hugepage memory in a user application using the mmap
 * system call with MAP_HUGETLB flag.  Before running this program make
 * sure the administrator has allocated enough default sized huge pages
 * to cover the 256 MB allocation.
 *
 * For ia64 architecture, Linux kernel reserves Region number 4 for hugepages.
 * That means the addresses starting with 0x800000... will need to be
 * specified.  Specifying a fixed address is not required on ppc64, i386
 * or x86_64.
 */

我想查看 if the administrator has allocated enough default sized huge pages to cover the 256 MB allocation 但我是系统管理员。我应该怎么办？我在 ubuntu 20.04 x86_64 机器上。（附带问题：mmap 是否使用堆区域？）

添加：请看我的评论（我添加了一个启动命令参数，代码可以工作。我临时在 grub 菜单中添加了启动参数。）但我希望我可以添加一个初始化脚本，这样每次都能生效计算机启动。

Answer 1

好像有2种方法。

在 /etc/sysctrl.conf 中添加 vm.nr_hugepages = 16 并重新启动。
我检查过这个有效。
（正如 Nate Eldredge 评论的那样）在 /etc/default/grub 的 GRUB_CMDLINE_LINUX="" 行（引号内）中添加 'hugepages=16' 并执行 update-grub。

mmap error : cannot allocate memory. how to allocate enough default sized huge pages as admin?

mmap error : cannot allocate memory. how to allocate enough default sized huge pages as admin?

memory

memory-management

mmap

ubuntu-20.04

grub