memory (instance statistics)

AMPS can provide information regarding the process’s memory usage in its RSS and VMSize via the memory resource in the monitoring interface.

Metric	Description	Type
caches	Information about AMPS memory caches.	(see caches)
paginations	Information about paginated result sets.	(see paginations)
rss	The resident set size of the AMPS process.	snapshot
vmsize	The virtual memory size of the AMPS process.	snapshot

Statistics Database Tables: IMEMORY_STATIC, IMEMORY_DYNAMIC, IMEMORY_CACHES_STATIC, IMEMORY_CACHES_DYNAMIC

Admin Path: /amps/instance/memory/<metric>, /amps/instance/memory/caches/<identifier>/*<metric>, /amps/instance/memory/paginations/<metric>

The caches element provides information about currently-active memory caches.

Metric	Description	Type
allocations	Number of memory allocations for this cache.	cumulative
bytes	Number of bytes allocated to this cache.	snapshot
description	Description of the cache.	fixed
efficiency	Ratio of hits to requests for this cache.	snapshot
entries	Number of entries in this cache.	snapshot
evictions	Count of evictions from this cache.	cumulative
fetches	Count of fetches from this cache.	cumulative
overflow_bytes	Bytes allocated for slow consumers to this cache.	cumulative

The following caches may appear in AMPS statistics:

Cache Name	Description
byte buffer cache	General purpose cache.
byte in buffer cache	Cache for bytes being received from clients.
byte out buffer cache	Cache for bytes being sent to clients.
client cache	Cache for client objects.
client entitlement cache	Cache for maintaining entitlement information.
client session cache	Cache for maintaining current session state.
client status cache	Cache for forming client status messages.
message cache	Cache for message objects.
query context cache	Cache for query contexts.
sow update cache	Cache for SOW updates.
subscription cache	Cache for subscription state.
xpath value data buffer cache	Cache for XPath values.

Statistics Database Table: IMEMORY_CACHES

The paginations element provides information about currently-active paginated subscriptions in AMPS.

Metric	Description	Type
memory_bytes	Number of bytes consumed to maintain this paginated set.	snapshot
message_type	Message type for this paginated set.	fixed
subscription_count	Number of subscriptions using this paginated set.	snapshot
topic	Source topic for this paginated set.	fixed

Statistics Database Table: IPAGINATIONS