| IBM® i See IBM® i
to view shared memory statistics in IBM i.
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- Statistics about the shared memory pool, such as:
- Total number of page faults for all of the shared memory partitions
- Total time, in milliseconds, that the processors waited for page
faults to be resolved
- Total physical memory, in bytes, that is assigned to the shared
memory pool
- Sum of the logical memory, in bytes, that is assigned to all of
the shared memory partitions that are active
- Sum of the I/O entitled memory, in bytes, that is assigned to
all of the shared memory partitions that are active
- Sum of the physical memory, in bytes, that the shared memory partitions
that are active currently use for their I/O devices
- Statistics about the shared memory partition, such as:
- Memory weight of the shared memory partition
- Amount of physical memory, in bytes, from the shared memory pool
that is currently used by the shared memory partition
- Number of times that the shared memory partition waited for a
page fault
- The time, in milliseconds, that the shared memory partition waited
for page faults to be resolved
- Maximum amount of memory, in bytes, that the shared memory partition
can assign to data areas that are shared between the operating system
and the server firmware
- I/O entitled memory assigned to the shared memory partition
- Minimum amount of physical memory, in bytes, required for all
of the configured I/O devices to operate
- Optimal amount of physical memory, in bytes, required for I/O
devices to maximize throughput performance
- Amount of physical memory, in bytes, that the shared memory partition
currently uses for its I/O devices
- Highest amount of physical memory, in bytes, that the shared memory
partition has used for its I/O devices since the last time the shared
memory partition was activated or since the last time the memory statistics
were reset, whichever is most recent
- Number of delayed I/O operations since the last time the shared
memory partition was activated
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| Linux View memory statistics for
Linux in the sysfs file system as
follows:
- Shared memory partition data:
cat /proc/ppc64/lparcfg
- Virtual I/O bus attributes:
/sys/bus/vio/ directory.
- Virtual I/O device attributes:
/sys/bus/vio/devices/ directory. This directory
has a subdirectory for each device. Look in the subdirectory for each device to see the virtual I/O
device statistics for each device.
- Shared Memory statistics: amsstat (included in powerpc-utils)
- Shared Memory graphical monitoring: amsvis (included in
powerpc-utils-python)
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- Statistics about the shared memory partition:
- I/O entitled memory set for the shared memory partition
- Memory weight of the shared memory partition
- Amount of physical memory allocated to the shared memory partition
- Size of the shared memory pool to which the shared memory partition
belongs
- Frequency that data is written to the shared memory pool from
the paging space device
- The time it takes, in microseconds, for data to be written to
the shared memory pool from the paging space device
- Statistics about the virtual I/O bus, such as the highest amount
of physical memory the shared memory partition has ever used for its
I/O devices.
- Statistics about the virtual I/O devices, such as the frequency
that the device tried to map a page to perform an I/O operation and
was unable to obtain sufficient memory. In this situation, the attempt
fails and delays the I/O operation.
- Statistics about the tools:
- The packages powerpc-utils and powerpc-utils-python are
user space packages.
- The amsstat script can be run from a Linux logical partition to display
shared memory statistics associated with the logical partition.
- The amsvis tool is a python based graphical
tool that displays similar information in a graphical manner. This
tool is capable of aggregating data from multiple Linux shared memory logical partitions to obtain
a picture of cross logical partition performance of shared memory Linux logical partitions.
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