Java Virtual Machine (Jvm) Information; Java Virtual Machine (Jvm) Statistics - Sun Microsystems Sun Java System Web Server 7.0 Manual

Using Monitoring Data to Tune Your Server
Tuning
You can set the maximum size of the DNS cache in the Admin Console in the Maximum Cache
Size field on the configuration's Performance tab ⇒ DNS sub tab, under DNS Cache Settings.
To set it using the command-line-interface, use wadm set-dns-cache-prop and set the
max-entries property. The default cache size is 1024. The value range is 2-32768.
Hit Ratio (Cache Hits / Cache Lookups)
The hit ratio in perfdump displays the number of cache hits compared to the number of cache
lookups. You can compute this number using the statistics in the Admin Console by dividing
the Total Cache Hits by the sum of the Total Cache Hits and the Total Cache Misses.
This setting is not tunable.
Async DNS Enabled/Disabled
Async DNS enabled/disabled displays whether the server uses its own asynchronous DNS
resolver instead of the operating system's synchronous resolver. By default, Async DNS is
disabled. If it is disabled, this section does not appear in perfdump. To enable it using the Admin
Console, on the configuration's Performance tab ⇒ DNS tab, under DNS Lookup Settings,
select Asynchronous DNS. To enable it using the command-line interface, use wadm
set-dns-prop and set the async property to true.

Java Virtual Machine (JVM) Information

JVM statistics are displayed through the Admin Console, the CLI, and stats-xml only. They
are not shown in perfdump.
The following table shows an example of the JVM statistics displayed in the Admin Console:
TABLE 2–7
Virtual Machine Name
Virtual Machine Vendor
Virtual Machine Version
Heap Memory Size
Elapsed Garbage Collection Time (milli seconds)
Present Number of Classes Loaded
Total Number of Classes Loaded
70 Sun Java System Web Server 7.0 Update 1 Performance Tuning, Sizing, and Scaling Guide •

Java Virtual Machine (JVM) Statistics

TM
Java HotSpot Server VM
Sun Microsystems Inc.
1.5.0_06-b05
5884856
51
1795
1795