Latest revision as of 23:28, 14 October 2010

Graphs

The Graphs tab in the /resin-admin gives you a view of the meter data collected by Resin across the cluster. The Statistics service that gathers the Meter data is available in Resin Professional.

Graph Browsing

When looking at the server statistics, you first need to select meters to display. Resin's meters are the statistics data streams gathered every minute and stored by the triad servers. Some meters are JMX attributes collected over time, and others record data from Resin's embedded sensors.

Selecting a meter will add the meter to the graph. Once you've selected a group of meters, you can save them as a named meter set using meter save.

Meter Names

Meter names follow a standard convention: "00|Author|Group|Name". The "00" is the server index in the cluster. Author is soemthing like "JVM", "OS", or "Resin", or "MyCom" for custom meters.

Server Groups

Graphs for servers in the cluster can be displayed in three basic modes: single server, one graph, or multiple graphs. In the single graph mode, each meter for each server has its own graph line. In the multiple graph mode, each server gets its own graph. The multiple-graph mode is more useful comparisons across the cluster.

Cookbook: setting up a thread graph

1. Clear all the meters by clicking the "Clear Meters" button on the right.
2. Open the "JVM|Thread" group to find the recorded data from the JVM's own thread count.
3. Select "JVM Thread Count". You should see a graph of the JVM's thread count in the graph. You can use the "Time" selector to change the timescale to use.
4. Open the "Resin|Thread" group for the meters in Resin's own thread pool.
5. Select all the meters in the "Resin|Thread" group. You should see a graph with about 4 lines visible and the rest at zero.
6. Type "threads" in the Meter Save Name form and select "Save Meters". Saving the meters will add "threads" as a predefined meter group in the Meters selection at the top.

Meters

The predefined meters are in three groups: JVM, OS, and Resin.

• JVM is data from the JVM's JMX beans, like thread counts and garbage collection.
• OS is data from the operating system, like CPU counts.
• Resin is data from Resin's JMX and sensors

JVM|Compilation

The JVM compilation group measure JIT compilation times as reported by the JVM.

Compilation Time

the time taken for garbage collection in the last 60 seconds.

JVM|Memory

The JVM's memory and garbage collection information is useful when tuning memory and checking for memory leak situations, and checking that GC time is in a reasonable range.

GC Time|PS MarkSweep

the GC time taken in the last 60 seconds for full mark-sweep collection as reported by the JVM.

GC Time|PS Scavenge

the GC time taken for short GC scavenging as reported by the JVM.

Heap Memory Free

free heap memory in bytes as reported by the JVM

Heap Memory Used

total allocated memory in the heap

Loaded Classes

total number of classes loaded by the JVM

PermGen Memory Free

memory free in the "perm gen" group, used for .class data

PermGen Memory Used

allocated memory in the perm gen pool.

Tenured Memory Free

free memory in the long-term tenured heap

Tenured Memory Used

allocated memory in the long-term tenured heap

JVM|Thread

The JVM's thread group reports the total number of threads in the JVM.

JVM Thread Count

The total threads in the JVM

OS|CPU

The CPU load as reported by the JVM. This report is different for different operating systems. On Linux, the CPU is reported for each CPU and combined.

Unix Load Avg

On Unix systems (non-Linux), reports the system's Load Average. The load average is the count of runnable processes; it's not directly a CPU load measure

OS|Memory

The OS|Memory group report operating system memory.

Physical Memory Free

The physical free memory as reported in JMX.

Swap Free

The free swap as reported in JMX.

OS|Process

Process-related information as reported by the OS.

File Descriptor Count

The number of open files and sockets in the JVM process

Resin|Cache

The cache statistics include both the proxy cache and Resin's underlying block cache, which is also used for distributed sessions.

Block Miss Count

How many times the low-level block cache missed, causing Resin to read or write from disk

Block Read Count

The count of blocks read in the last 60 seconds.

Block Write Count

How many blocks were written to disk in the last 60 seconds.

Proxy Cache Hit Count

How many requests successfully used the proxy cache in the last 60 seconds.

Proxy Cache Miss Count

How many cacheable requests failed to find a valid page in the proxy cache in the last 60 seconds.

Troubleshooting

A high block read or write count may indicate that the block cache is too small. Since the purpose of the block cache is to reduce the slow filesystem reads and writes, high block reads and writes means Resin is spending more time reading and writing files.

Resin|Cluster

The Cluster group measures outgoing connections to other servers in the Resin system. This measurement is similar to the heartbeat since it counts cluster connections.

There are separate meters for each outgoing server. So server #2 will have data going to servers #0 and #1.

Connection Active|NN cluster-id

Measure the current active connections from this server to a target server named by "NN:cluster-id"

Connection Count|NN cluster-id

Counts the number of connections created in the last 60s from this server to the target server.

Idle Active|NN cluster-id

Counts the current idle connections in the pool from this server to the target server.

Idle Count|NN cluster-id

Counts the number of transitions to the idle state.

Request Active|NN cluster-id

The current number of active requests from this server to the target server

Request Count|NN cluster-id

The number of requests to the target server in the last 60s.

Request Fail|NN cluster-id

The number of failed requests to the target server in the last 60s

Request Time|NN cluster-id

The average request time for requests to the target server in the last 60s.

Request Time Max

NN cluster-id

The longest request time for a request to the target server in the last 60s

Request Time 95%

NN cluster-id

The time for 95% of requests to complete

Resin|Database

The data for the Resin database pool lets you tune the pool, and check for slow database queries.

Query Active

Counts the current number of active queries.

Query Count

Counts the queries in the last 60s

Query Time

The average query time in the last 60s

Query Time Max

The maximum query time in the last 60s

Query Time 95%

The time for 95% of queries to complete

Connection Active

The current number of active database connections

Connection Count

The number of connections created in the last 60s

Connection Time

The average open time for connections in the last 60s.

Idle Active

The current number of idle connections in the database pool

Idle Count

The number of connections changing to the idle state in the last 60s

Idle Time

The average time connections are idle for the last 60s.

Resin|Health

Each health check in Resin's health system records its current status as a meter. Since the "OK" level is zero, a stable system has a zero graph. The warning level is 1 and the fail level is 2.

Resin|Http

HTTP requests and sessions are recorded in the Resin|Http section, letting you check for slow requests and unexpected HTTP session sizes.

Request Active

The current number of active requests

Request Bytes

The number of bytes transferred in the last 60s

Request Count

The number of requests in the last 60s

Request Time

The average time for a request in the last 60s

Request Time Max

The slowest request in the last 60s

Request Time 95%

The time for 95% of requests to complete

Session Save Count

The number of sessions saved in the last 60s

Session Save Size

The average serialized session size in the last 60s

Resin|Thread

Statistics related to the Resin thread pool, used for requests and timers.

Thread Active Count

The number of threads currently active

Thread Count

The total number of threads managed by Resin

Thread Create Count

The threads created by Resin in the last 60s

Thread Idle Count

The current number of threads idle in the pool.

Thread Overflow Count

The number of threads Resin created using the overflow method.

Thread Priority Queue

The number of threads dispatching the priority queue

Thread Starting Count

The current number of threads starting

Thread Task Queue

The number of threads reading from the task queue

Thread Wait Count

The requests waiting for an active thread

Troubleshooting

• The thread create count should generally be very low, and preferably zero. If the create count is high, the pool isn't being effective.
• The overflow count should be zero unless the pool is overflowing.
• The Priority Queue and Task Queue counts should generally be zero unless there's a thread spike.