In some scenarios, it may be necessary to monitor server metrics outside of the Advanced Server Monitoring Agent. Many of these metrics can be replicated by following the reference table below.
For a description of the various metrics collected, please see the Server Metrics section.
Most performance counters for Windows machines are also available to developers using Perfmon.
Counter Name |
Perfmon Counter Path |
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Processor Counters |
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CPU % |
\Processor(_Total)\% Processor Time |
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Context switches/sec |
\System\Context Switches/sec |
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Process Queue Length |
\System\Processor Queue Length |
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Memory Counters |
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Memory % |
\Memory\% Commited Bytes In Use |
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Page reads/sec |
\Memory\Page Reads/sec |
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Page Writes/sec |
\Memory\Page Writes/sec |
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Cache Memory Allocation |
\Memory\Cache Bytes |
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Disk Counters |
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% I/O Time Utilized |
\PhysicalDisk(_Total)\% Idle Time (Calculation taken as 100 - counter value) |
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Service time |
\PhysicalDisk(_Total)\Avg. Disk sec/Transfer |
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Queue Length |
\PhysicalDisk(_Total)\Current Disk Queue Length |
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Reads/sec |
\PhysicalDisk(_Total)\Disk Reads/sec |
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Writes/sec |
\PhysicalDisk(_Total)\Disk Writes/sec |
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Network CountersNote: for values coming from a Network Interface, the Server Monitoring Agent will record the sum of all instances, excluding the local loop-back interface. |
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Packets Received/sec |
\Network Interface(interface name)\Packets Received/sec |
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Packets Sent/sec |
\Network Interface(interface name)\Packets Sent/sec |
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Bytes received/sec |
\Network Interface(interface name)\Bytes Received/sec |
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Bytes sent/sec |
\Network Interface(interface name)\Bytes Sent/sec |
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Packets Received Errors |
\Network Interface(interface name)\Packets Received Errors |
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Packets Sent Errors |
\Network Interface(interface name)\Packets Outbound Errors |
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Connections Established |
\TCP\Connections Established |
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Connection Failures |
\TCP\Connection Failures |
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TCP Segments Retransmitted |
\TCP\Segments Retransmitted/sec |
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Performance counters for Linux are calculated by examining the following values, if available. Some counters may be measured from multiple sources, in which case a source will be selected which appears applicable to the current kernel.
Counter Name |
File |
Relevant lines, columns |
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Processor Counters |
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CPU % |
/proc/stat |
Line: cpu 4th numeric column is idle time |
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Context switches/sec |
/proc/stat
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Line: ctxt |
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Process Queue Length |
/proc/stat
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Line: procs_running |
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Memory Counters |
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Memory % |
/proc/meminfo |
Lines: MemTotal, MemFree, Buffers, Cached |
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Cache Memory Allocation Ratio |
/proc/meminfo |
Lines: MemTotal, Cached, SwapCached |
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Major Page Faults |
/proc/vmstat |
Line: pgmajfault |
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Page ins/sec |
/proc/stat |
Line: page, Column: 1 |
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/proc/vmstat |
Line: pgpgin |
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Page outs/sec |
/proc/stat |
Line: page, Column: 2 |
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/proc/vmstat |
Line: pgpgout |
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Disk CountersNote: Counters are measured by summing values from all physical disks, excluding logical disks |
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% I/O Time Utilized |
/proc/partitions |
Column: 14 |
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/proc/diskstats |
Column: 13 |
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Average Service time |
/proc/partitions |
Columns: 5, 9, 13, 15 |
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/proc/diskstats |
Columns: 4, 8, 12, 14 |
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Queue Length |
/proc/partitions |
Column: 13 |
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/proc/diskstats |
Column: 12 |
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Reads/sec |
/proc/partitions |
Column: 5 |
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/proc/diskstats |
Column: 4 |
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Writes/sec |
/proc/partitions |
Column: 9 |
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/proc/diskstats |
Column: 8 |
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Network CountersNote: for values coming from a Network Interface, the Server Monitoring Agent will record the sum of all instances, excluding the local loop-back interface. |
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Packets Received/sec |
/proc/net/dev |
Column: 3 |
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Packets Sent/sec |
/proc/net/dev |
Column: 11 |
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Bytes received/sec |
/proc/net/dev |
Column: 2 |
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Bytes sent/sec |
/proc/net/dev |
Column: 10 |
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Packets Received Errors |
/proc/net/dev |
Column: 4 |
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Packets Sent Errors |
/proc/net/dev |
Column: 12 |
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Collisions/sec |
/proc/net/dev |
Column: 15 |
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Connections Established |
/proc/net/snmp |
Line: Tcp, Column 9 |
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Connection Failures |
/proc/net/snmp |
Line: Tcp, Column 8 |
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TCP Segments Retransmitted |
/proc/net/snmp |
Line: Tcp, Column 12 |
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