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Azure Managed Cache Service Performance Counters

Updated: July 16, 2010

noteNote
For guidance on choosing the right Azure Cache offering for your application, see Which Azure Cache offering is right for me?.

This topic provides a description of the performance counters available for monitoring Azure Managed Cache Service applications.

Cache Performance Counters

Microsoft Azure Cache provides performance monitor counters that allow you to monitor and troubleshoot Managed Cache Service applications. There are separate performance counters for cache clients and the Managed Cache Service.

Cache Service Performance Counters

Managed Cache Service provides performance counters to help you monitor the health and performance of your cache, and to help with capacity planning for cache scaling. These performance counters can be viewed and configured in the Management Portal on the Monitor tab for Cache.

Configure Cache Service Performance Counters

To view and configure Managed Cache Service performance counters, log into the Management Portal and navigate to the Monitor tab for Cache.

Cache Service Monitor Tab

You can choose up to twelve metrics for the metrics table, and plot any six of those metrics on the chart by selecting the check boxes by their table headers.

To add or remove performance counters, click Add Metrics.

Cache Service Monitor tab Select Metrics

Cache Service Performance Counters Reference

The following table lists the performance counters for Managed Cache Service.

noteNote
Performance counters that provide information from the start of the cache service are reset if the cache service is stopped, such as when the cache offering is changed.

The GetAndLock method is considered a read operation. If the object is returned to the client, counters that measure reads and data sent are updated. If the object is already locked, the Cache Miss % count is incremented. In the same way, the PutAndUnlock is a write operation.

Methods that change the state of objects in the cache, such as Unlock and ResetTimeout, are not included in the read or write counts. Instead, these methods are reflected in the client request count.

 

Performance Counter Description

Bandwidth Used %

The percentage of bandwidth capacity used.

The cache is hosted on a dedicated infrastructure which provides incoming and outgoing bandwidth to the system. The bandwidth utilization reflects how this bandwidth is being used. If your system as a lot of large objects, you may see the bandwidth utilization being high.

Bytes Received /sec

The number of bytes of data received per second by the cache from clients.

Bytes Sent /sec

The number of bytes of data sent per second by the cache to clients.

Cache Miss %

The percentage of unsuccessful cache requests to the total number of requests since the start of the cache service.

Compute Used %

The percentage of the processing used.

The cache service utilizes compute resources to service all cache requests. For high throughput applications, the compute resources made available to your dedicated infrastructure can get exhausted. Hence it is important for such applications to monitor the Compute Used % to ensure that it isn’t more than 70-80%, which will ensure that your cache remains responsive and data access continues with low latency.

Data Size in Bytes

The total size of cached data in the cache, not including cache overhead.

Evicted Objects

The number of evicted objects since the start of the cache service.

Expired Objects

The number of expired objects since the start of the cache service.

Memory Used %

The percentage of memory capacity used, including the overhead to memory provisioned for the cache service.

The allocated amount of memory for cache is used for storing the user data and the metadata about these objects that the cache needs to store for serving requests. This counter reflects how much of the usable memory of cache is already utilized.

Note that you may not see an exact match on the amount of data you put in vs. the utilization, as it will vary depending on your object size and use of features such as tags, regions and notifications.

Object Count

The number of objects stored in cache.

Primary Data Size in Bytes

The size of primary memory data usage of the cache, not including cache overhead, and not including secondary copies of data for High Availability.

Read Requests

The number of read requests (Bulk Get, Get and Enumeration) received from all clients since start of the cache service.

Read Requests /sec

The number of read requests (Bulk Get, Get and Enumeration) received per second from all clients since start of cache service.

Write Requests

The number of write requests (Put, Add and Lock) since start of the cache service.

Write Requests /sec

The number of write requests per second since start of cache service. Put, Add and Lock methods are included with write operations.

Cache Client Performance Counters

There are two categories of cache client performance counters: Azure Caching:Client and Azure Caching:Client Host. Azure Caching:Client has counters that provide information about a single cache client. Azure Caching:Client Host has the same counters as Azure Caching:Client, and provides aggregated information about all of the cache clients on a machine.

noteNote
To view cache client performance counters in the , select counters from the Azure Caching:Client Host category.

Azure Caching:Client

The Azure Caching:Client performance counter category provides counters that pertain to a single cache client.

 

Performance Counter Description

Average Get Latency / operation Microsecond

The average latency in, microseconds for Get requests irrespective of whether they access the local cache or the cache.

Average Get Latency (Network) / operation Microsecond

The average latency in microseconds for Get requests that access the cache. This excludes calls that access the local cache.

Average Put Latency / operation Microsecond

The average latency in microseconds for Put requests.

Local Cache Hits Percentage

The percentage of Get requests across all cache clients (irrespective of their local cache settings) that are fulfilled by the local cache.

Local Cache Filled Percentage

The percentage of objects stored in local cache in relation to the total capacity of the local cache. Note that that is an aggregation of the local cache properties of all cache clients in the current process.

Read Requests

The number of Read requests (Get and Enumeration) since the start of the process.

Write Requests

The number of Write requests (Put and Add) requests since the start of the process.

Bytes Received / sec

The number of bytes of data received from the cache during the previous second.

Bytes Sent / sec

The number of bytes of data sent to the cache during the previous second.

Current Server Connections

The number of active connections to the cache from this process.

Total Connection Requests Failed

The number of failed connection requests since start of the process.

Current Waiting Requests

The current number of requests which have not yet received a response from the cache.

Total Notifications Received

The number of Caching notifications received since start of the process.

Failure Exceptions

The number of Caching exceptions received since the start of the process.

Failure Exceptions / sec

The rate of Caching exceptions received by the process.

Retry Exceptions

The number of retry operation exceptions received since the start of the process.

Retry Exceptions / sec

The rate of retry operation exceptions received by the process.

Timeout Exceptions

The number of timeout exceptions received since the start of the process.

Timeout Exceptions / sec

The rate of timeout exceptions received by the process.

Network Exceptions

The number of network exceptions received since the start of the process.

Network Exceptions / sec

The rate of network exceptions received by the process.

Server Responses Dropped / sec

The total number of times when the process was unable to receive a response from the cache. This can happen when a client thread experiences a timeout and there are no other threads available to receive the response.

Requests

The number of requests sent from process to the cache since start of the process.

Requests / sec

The rate of requests sent from the process to the cache.

Total Local Cache Hits

The total number of requests that are fulfilled by the local cache since start of the process. This does not differentiate between different cache clients with different local cache settings.

Total Local Cache Objects

The total number of objects in local cache. Note that that is an aggregation of the local cache properties of all cache clients in the current process.

Azure Caching:Client Host

The Azure Caching:Client Host performance counter category provides counters that pertain to all of the cache clients on a machine. To view cache client performance counter data in the , use performance counters from the Azure Caching:Client Host category.

 

Performance Counter Description

Average Get Latency / operation Microsecond

The average latency in, microseconds for Get requests irrespective of whether they access the local cache or the cache.

Average Get Latency (Network) / operation Microsecond

The average latency in microseconds for Get requests that access the cache. This excludes calls that access the local cache.

Average Put Latency / operation Microsecond

The average latency in microseconds for Put requests.

Local Cache Hits Percentage

The percentage of Get requests across all cache clients (irrespective of their local cache settings) that are fulfilled by the local cache.

Local Cache Filled Percentage

The percentage of objects stored in local cache in relation to the total capacity of the local cache. Note that that is an aggregation of the local cache properties of all cache clients in the current process.

Read Requests

The number of Read requests (Get and Enumeration) since the start of all client processes on the machine.

Write Requests

The number of Write requests (Put and Add) requests since the start of all client processes on the machine.

Bytes Received / sec

The number of bytes of data received from the cache during the previous second.

Bytes Sent / sec

The number of bytes of data sent to the cache during the previous second.

Current Server Connections

The number of active connections to the cache from all client processes on the machine.

Total Connection Requests Failed

The number of failed connection requests since start of all client processes on the machine.

Current Waiting Requests

The current number of requests which have not yet received a response from the cache.

Total Notifications Received

The number of Caching notifications received since start of all client processes on the machine.

Failure Exceptions

The number of Caching exceptions received since the start of all client processes on the machine.

Failure Exceptions / sec

The rate of Caching exceptions received by all client processes on the machine.

Retry Exceptions

The number of retry operation exceptions received since the start of all client processes on the machine.

Retry Exceptions / sec

The rate of retry operation exceptions received by all client processes on the machine.

Timeout Exceptions

The number of timeout exceptions received since the start of all client processes on the machine.

Timeout Exceptions / sec

The rate of timeout exceptions received by all client processes on the machine.

Network Exceptions

The number of network exceptions received since the start of all client processes on the machine.

Network Exceptions / sec

The rate of network exceptions received by the process.

Server Responses Dropped / sec

The total number of times all clients on the machine were unable to receive a response from the cache. This can happen when a client thread experiences a timeout and there are no other threads available to receive the response.

Requests

The number of requests sent from process to the cache since start of all client processes on the machine.

Requests / sec

The rate of requests sent from all client processes on the machine to the cache.

Total Local Cache Hits

The total number of requests that are fulfilled by the local cache since start of all client processes on the machine. This does not differentiate between different cache clients with different local cache settings.

Total Local Cache Objects

The total number of objects in local cache. Note that that is an aggregation of the local cache properties of all cache clients in the current process.

See Also

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