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Android 10 and higher support resizable partitions byrelocating the fastboot implementation from bootloader to userspace. Thisrelocation enables moving the flashing code into a maintainable and testablecommon location with only the vendor-specific parts of fastboot implemented by ahardware abstraction layer (HAL).

版本: Open MPI 3.0.1. 编译好可执行的C语言程序后,使用 mpirun -np 3 Test 命令,发现没有正常运行,而是报错:. There are not enough slots available in the system to satisfy the 3 slots. If the system fails to run with any one of the RAM installed, then that stick of RAM is faulty. Similarly, check the slots in use by inserting a known working stick of RAM in it and running your computer. If it fails to run on any one slot, then the slot in question is faulty rendering the RAM inserted in it unusable by Windows.

Unifying fastboot and recovery

Because userspace fastboot and recovery are similar, you can merge theminto one partition/binary. Advantages include less space use and fewerpartitions overall, as well as the ability for fastboot and recovery to sharetheir kernel and libraries.

In order to make efficient use of the communications channel, a system must be devised for managing the available slots. In the advanced mobile phone system (AMPS), the cellular system employed in the United States, different callers use separate frequency slots via FDMA. When one telephone call is completed, a network-managing computer at the. Ram is utilized as 'transitory capacity' by your PC. The measure of RAM you have decides the measure of projects and administrations the PC can have open and running.

To support fastbootd, the bootloader must implement a new boot control block(BCB) command of boot-fastboot. To enter fastbootd mode, bootloader shouldwrite boot-fastboot into the command field of the BCB message and leave therecovery field of BCB unchanged (to enable restart of interrupted recoverytasks). The status, stage, and reserved fields remain unchanged as well.The bootloader is expected to load and boot into the recovery image upon seeingboot-fastboot in the BCB command. Recovery then parses the BCB message andswitches to fastbootd mode.

ADB commands

This section describes the adb command for integrating fastbootd. Thecommand has different behavior depending on whether system or recovery executesthe command.

CommandDescription
reboot fastboot
  • Reboots into fastbootd (system).
  • Enters fastbootd directly without a reboot (recovery).

Fastboot commands

This section describes the fastboot commands for integrating fastbootd,including new commands for flashing and managing logical partitions. Somecommands have different behavior depending on whether bootloader or fastbootdexecutes the command.

CommandDescription
reboot recovery
  • Reboots into recovery (bootloader).
  • Enters recovery directly without a reboot (fastbootd).
reboot fastbootReboots into fastbootd.
getvar is-userspace
  • Returns yes (fastbootd).
  • Returns no (bootloader).
getvar is-logical:<partition>Returns yes if the given partition is a logical partition,no otherwise.Logical partitions support all of the commands listed below.
getvar super-partition-nameReturns the name of the super partition. The name includes the current slotsuffix if the super partition is an A/B partition (it is usually not).
create-logical-partition <partition> <size>Creates a logical partition with the given name and size. The name must notalready exist as a logical partition.
delete-logical-partition <partition>Deletes the given logical partition (effectively wiping the partition).
resize-logical-partition <partition> <size>Resizes the logical partition to the new size without changing its contents.Fails if not enough space is available to perform the resize.
update-super <partition>Merges changes to the super partition metadata. If a merge isn't possible(for example, the format on the device is an unsupported version), then thiscommand fails. An optional wipe parameter overwrites the device'smetadata rather than performing a merge.
flash <partition> [ <filename> ]Writes a file to a flash partition. Device must be in unlocked state.
erase <partition>Erases a partition (not required to be secure erase). Device must be inunlocked state.
getvar <variable> allDisplays a bootloader variable, or all variables. If the variable doesn'texist, returns an error.
set_active <slot>

Sets the given A/B booting slot as active. On the nextboot attempt, the system boots from the specified slot.

For A/B support, slots are duplicated sets of partitions that can be bootedfrom independently. Slots are named a, b, etc. anddifferentiated by adding the suffixes _a, _b, etc. tothe partition name.

rebootReboots device normally.
reboot-bootloader (or reboot bootloader)Reboots device into bootloader.

Fastboot and bootloader

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The bootloader flashes the bootloader, radio, and boot/recoverypartitions, after which the device boots into fastboot (userspace) and flashesall other partitions. The bootloader should support the following commands.

CommandDescription
downloadDownloads the image to flash.
flash recovery <image>/ flash boot <image>/ flashbootloader <image>/Flashes recovery/boot partition and bootloader.
rebootReboots the device.
reboot fastbootReboots to fastboot.
reboot recoveryReboots to recovery.
getvarGets a bootloader variable that is required for flashing of recovery/bootimage (for example, current-slot andmax-download-size).
oem <command>Command defined by OEM.
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Dynamic partitions

The bootloader must not allow the flashing or erasing of dynamic partitionsand must return an error if these operations are attempted. For retrofitteddynamic partition devices, the fastboot tool (and bootloader) supports a forcemode to directly flash a dynamic partition while in bootloader mode. Forexample, if system is a dynamic partition on the retrofitted device,using fastboot --force flash system allows the bootloader to flash thepartition instead of fastbootd.

Note:

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Force mode is intended to provide flexibility in factory flashing andisn't recommended for developers.

Off-mode charging

If a device supports off-mode charging or otherwise autoboots into a specialmode when power is applied, the fastboot oem off-mode-charge 0 command shouldbypass these special modes and the device should boot as if the user had pressedthe power button.

Fastboot OEM HAL

To completely replace bootloader fastboot, fastboot must handle all existingfastboot commands. Many of these commands are from OEMs and are documented butrequire a custom implementation (many commands are also OEM-specific and notdocumented). To handle such commands, the fastboot HAL specifies the requiredOEM commands and allows OEMs to implement their own commands.

The definition of fastboot HAL is as follows:

Enabling fastbootd

To enable fastbootd on a device:

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  1. Add fastbootd to PRODUCT_PACKAGES in device.mk: PRODUCT_PACKAGES +=fastbootd.

  2. Ensure that the fastboot HAL, boot control HAL, and health HAL are packagedas part of the recovery image.

  3. Add any device-specific SEPolicy permissions required by fastbootd. Forexample, fastbootd requires write access to a device-specific partition toflash that partition. In addition, fastboot HAL implementation may alsorequire device-specific permissions.

To validate userspace fastboot, run the Vendor Test Suite(VTS).

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2016-10-05 16:22:19 UTC

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Sorry about the incomplete message...
Is there any idea about the following error? On that node, there are 15
empty cores.
$ /share/apps/siesta/openmpi-2.0.1/bin/mpirun --host compute-0-3 -np 2
/share/apps/siesta/siesta-4.0-mpi201/tpar/transiesta < A.fdf
--------------------------------------------------------------------------
There are not enough slots available in the system to satisfy the 2 slots
that were requested by the application:
/share/apps/siesta/siesta-4.0-mpi201/tpar/transiesta
Either request fewer slots for your application, or make more slots
available
for use.
--------------------------------------------------------------------------
Regards,
Mahmood