I know that I am supposed to set mem=MEMORY_LIMIT
. But I do not know where to go, during runtime, or during boot time, in order to set a limit to the total physical memory that the OS has control of.
我知道我应该设置mem=MEMORY_LIMIT。但我不知道在运行时或启动时该往哪里走,以便对操作系统控制的总物理内存设置一个限制。
I am running I/O benchmarks, and I would like to limit the amount of overall physical memory that is available.
我正在运行I/O基准,我希望限制可用的总体物理内存的数量。
5 个解决方案
#1
13
I found the answer I was looking for. Basically, the parameter that sets the total available physical memory is "mem=MEMORY_LIMIT". And this is a kernel boot parameter. You need to add, say "mem=1G" for maximum of 1GB available physical memory to the kernel boot parameter. For more info on how to add kernel boot parameters look at https://wiki.ubuntu.com/Kernel/KernelBootParameters
我找到了我想要的答案。基本上,设置总可用物理内存的参数是“mem=MEMORY_LIMIT”。这是一个内核引导参数。您需要向内核引导参数添加最大1GB可用物理内存的“mem=1G”。有关如何添加内核引导参数的更多信息,请参见https://wiki.ubuntu.com/Kernel/KernelBootParameters
#2
5
Edit your kernel boot parameters in lilo.conf
, grub.conf
, grub.cfg
, or menu.lst
(which one depends on your particular distro and bootloader; check your distro's documentation for more detail) to include the parameter mem=512M
(or whatever size you want to emulate) on the line specifying your kernel parameters.
在lilo中编辑内核引导参数。相依,grub。相依,grub。cfg或菜单。lst(这取决于您的特定发行版和引导加载程序;检查发行版的文档以获得更多细节),以便在指定内核参数的行中包含参数mem=512M(或您想要模拟的任何大小)。
For instance, in Grub, there should be a line that says something like kernel /boot/vmlinuz param1=val1 param2=val2
. Add the mem=512M
to that list of parameters. You can create separate entries for your boot menu by copying these entire definitions, renaming them, and configuring each with a different amount of memory, so you can quickly boot with different settings.
例如,在Grub中,应该有一行代码,比如内核/boot/vmlinuz param1=val1 param2=val2。将mem=512M添加到参数列表中。您可以为您的引导菜单创建单独的条目,方法是复制这些完整的定义、重命名它们,并使用不同的内存对它们进行配置,这样您就可以使用不同的设置快速地引导它们。
#3
2
To add to Brian Campbell's list, for the uBoot bootloader on the BeagleBone / Black devices, edit the kernel paramters in /boot/uboot/uEnv.txt
Add or modify the line mmcargs=setenv bootargs mem=512M
[tested with Debian]
要添加到Brian Campbell的列表,对于BeagleBone / Black设备上的uBoot bootloader,请在/boot/ uBoot /uEnv中编辑内核参数。txt添加或修改mmcargs=setenv bootargs mem=512M[用Debian测试]
Use > free
before and after [reboot] to confirm the modification
使用>免费前后[重新启动]确认修改
#4
0
A1: Yes, you have to reboot.
是的,你得重新启动。
A2: The kernel is rather unforgiving with respect to typos. There are no error messages. Could that be your problem? Examples: " mem=512M" and " mem=2G". Don't forget the space following the previous parameter, mem is in lower case, and K, M or G are upper case.
A2:内核对于拼写错误是不宽容的。没有错误消息。这是你的问题吗?例如:“mem=512M”和“mem=2G”。不要忘记前面参数的空间,mem是小写的,K, M或G是大写的。
#5
0
I've followed the instructions in this page that KZcoding mentioned (part: Permanently Add a Kernel Boot Parameter)
我已经按照KZcoding提到的本页中的说明(部分:永久添加内核引导参数)
My Linux is (vm in virtualbox):
我的Linux是(虚拟机中的vm):
Linux ubuntu 4.4.0-21-generic #37-Ubuntu SMP Mon Apr 18 18:33:37 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
Before setting:
之前设置:
yavuz@ubuntu:~$ free -m
total used free shared buff/cache available
Mem: 3630 305 3010 6 314 3264
Swap: 3767 0 3767
Just changed this line in /etc/default/grub
只是在/etc/default/grub中更改了这一行
GRUB_CMDLINE_LINUX_DEFAULT=""
to
来
GRUB_CMDLINE_LINUX_DEFAULT="mem=2G"
then restart the server. After restart:
然后重新启动服务器。重启后:
yavuz@ubuntu:~$ free -m
total used free shared buff/cache available
Mem: 2000 298 1385 4 315 1651
Swap: 3767 0 3767
#1
13
I found the answer I was looking for. Basically, the parameter that sets the total available physical memory is "mem=MEMORY_LIMIT". And this is a kernel boot parameter. You need to add, say "mem=1G" for maximum of 1GB available physical memory to the kernel boot parameter. For more info on how to add kernel boot parameters look at https://wiki.ubuntu.com/Kernel/KernelBootParameters
我找到了我想要的答案。基本上,设置总可用物理内存的参数是“mem=MEMORY_LIMIT”。这是一个内核引导参数。您需要向内核引导参数添加最大1GB可用物理内存的“mem=1G”。有关如何添加内核引导参数的更多信息,请参见https://wiki.ubuntu.com/Kernel/KernelBootParameters
#2
5
Edit your kernel boot parameters in lilo.conf
, grub.conf
, grub.cfg
, or menu.lst
(which one depends on your particular distro and bootloader; check your distro's documentation for more detail) to include the parameter mem=512M
(or whatever size you want to emulate) on the line specifying your kernel parameters.
在lilo中编辑内核引导参数。相依,grub。相依,grub。cfg或菜单。lst(这取决于您的特定发行版和引导加载程序;检查发行版的文档以获得更多细节),以便在指定内核参数的行中包含参数mem=512M(或您想要模拟的任何大小)。
For instance, in Grub, there should be a line that says something like kernel /boot/vmlinuz param1=val1 param2=val2
. Add the mem=512M
to that list of parameters. You can create separate entries for your boot menu by copying these entire definitions, renaming them, and configuring each with a different amount of memory, so you can quickly boot with different settings.
例如,在Grub中,应该有一行代码,比如内核/boot/vmlinuz param1=val1 param2=val2。将mem=512M添加到参数列表中。您可以为您的引导菜单创建单独的条目,方法是复制这些完整的定义、重命名它们,并使用不同的内存对它们进行配置,这样您就可以使用不同的设置快速地引导它们。
#3
2
To add to Brian Campbell's list, for the uBoot bootloader on the BeagleBone / Black devices, edit the kernel paramters in /boot/uboot/uEnv.txt
Add or modify the line mmcargs=setenv bootargs mem=512M
[tested with Debian]
要添加到Brian Campbell的列表,对于BeagleBone / Black设备上的uBoot bootloader,请在/boot/ uBoot /uEnv中编辑内核参数。txt添加或修改mmcargs=setenv bootargs mem=512M[用Debian测试]
Use > free
before and after [reboot] to confirm the modification
使用>免费前后[重新启动]确认修改
#4
0
A1: Yes, you have to reboot.
是的,你得重新启动。
A2: The kernel is rather unforgiving with respect to typos. There are no error messages. Could that be your problem? Examples: " mem=512M" and " mem=2G". Don't forget the space following the previous parameter, mem is in lower case, and K, M or G are upper case.
A2:内核对于拼写错误是不宽容的。没有错误消息。这是你的问题吗?例如:“mem=512M”和“mem=2G”。不要忘记前面参数的空间,mem是小写的,K, M或G是大写的。
#5
0
I've followed the instructions in this page that KZcoding mentioned (part: Permanently Add a Kernel Boot Parameter)
我已经按照KZcoding提到的本页中的说明(部分:永久添加内核引导参数)
My Linux is (vm in virtualbox):
我的Linux是(虚拟机中的vm):
Linux ubuntu 4.4.0-21-generic #37-Ubuntu SMP Mon Apr 18 18:33:37 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
Before setting:
之前设置:
yavuz@ubuntu:~$ free -m
total used free shared buff/cache available
Mem: 3630 305 3010 6 314 3264
Swap: 3767 0 3767
Just changed this line in /etc/default/grub
只是在/etc/default/grub中更改了这一行
GRUB_CMDLINE_LINUX_DEFAULT=""
to
来
GRUB_CMDLINE_LINUX_DEFAULT="mem=2G"
then restart the server. After restart:
然后重新启动服务器。重启后:
yavuz@ubuntu:~$ free -m
total used free shared buff/cache available
Mem: 2000 298 1385 4 315 1651
Swap: 3767 0 3767