processModel Element in Machine.config

processModel Element in Machine.config

(The processModel's describe is from MSDN Microsoft)

The default processModel element in Machine.config of a particular server as follows: 

    <system.web>

        <processModel autoConfig="true"/>

    </system.web>

But all of the attributes in this element are:

     < processModel 

    enable="true|false"  

    timeout="hrs:mins:secs|Infinite"  

    idleTimeout="hrs:mins:secs|Infinite" 

    shutdownTimeout="hrs:mins:secs|Infinite" 

    requestLimit="num|Infinite"  

    requestQueueLimit="num|Infinite" 

    restartQueueLimit="num|Infinite"  

     memoryLimit="percent"  

    webGarden="true|false"  

    cpuMask="num"  

    userName="<username>"  

    password="<secure password>"  

    logLevel="All|None|Errors"  

    clientConnectedCheck="hrs:mins:secs|Infinite"  

    comAuthenticationLevel="Default|None|Connect|Call| Pkt|PktIntegrity|PktPrivacy" 

    comImpersonationLevel="Default|Anonymous|Identify| Impersonate|Delegate" 

    responseDeadlockInterval="hrs:mins:secs|Infinite"  

    responseRestartDeadlockInterval="hrs:mins:secs|Infinite"  

    autoConfig="true|false" 

    maxWorkerThreads="num" 

    maxIoThreads="num" 

    minWorkerThreads="num" 

    minIoThreads="num" 

    serverErrorMessageFile="" 

    pingFrequency="Infinite" 

    pingTimeout="Infinite" 

    maxAppDomains="2000" />

---

clientConnectedCheck

Specifies how long a request is left in the queue before ASP.NET does a check to determine whether the client is connected.

The default is "00:00:05" (5 seconds).

 

---

 

comAuthenticationLevel

 

Specifies the level of authentication for DCOM security.

The comAuthenticationLevel attribute can be one of the following values.

Value	Description
Call	Specifies that DCOM authenticates the credentials of the client when the server receives the request at the beginning of each remote procedure call.
Connect	Specifies that DCOM authenticates the credentials of the client only when the client establishes a connection to the server.
Default	Specifies that DCOM determines the authentication level using its standard security negotiation algorithm.
None	Specifies no authentication.
Pkt	Specifies that DCOM authenticates that all data received is from the expected client. Datagram transports always use Pkt authentication.
PktIntegrity	Specifies that DCOM authenticates and verifies that none of the data that is transferred between the client and the server is modified.
PktPrivacy	Specifies that DCOM authenticates all previous levels and encrypts the argument value of each remote procedure call.

The default is Connect.

 

---

 

 

comImpersonationLevel

 

Specifies the authentication level for COM security.

The comImpersonationLevel attribute can be one of the following values.

Value	Description
Anonymous	Specifies that the client is anonymous to the server. The server can impersonate the client, but the impersonation token will not contain any information. Anonymous is not supported in the .NET Framework version 1.1.
Default	Specifies that DCOM determines the impersonation level using its standard security negotiation algorithm.
Delegate	Specifies that the server process can impersonate the security context for the client while acting on behalf of the client. The server process can also make outgoing calls to other servers while acting on behalf of the client, using cloaking. The server can use the security context for the client on other computers to gain access to local and remote resources as the client. When impersonating at this level, the impersonation token can be passed across any number of machine boundaries.
Identify	Specifies that the server can obtain the identity for the client. The server can impersonate the client for access control list (ACL) checking, but it cannot access system objects as the client.
Impersonate	Specifies that the server process can impersonate the security context for the client while acting on behalf of the client. This level of impersonation can be used to access local resources, such as files. When impersonating at this level, the impersonation token can be passed across only one machine boundary.

The default is Impersonate.

 

---

cpuMask

 

Specifies which processors (CPUs) on a multiprocessor server are qualified to run ASP.NET processes. This value specifies a bit pattern that indicates the CPUs that are qualified to run ASP.NET threads. For example, the cpuMask hexadecimal value 0x0d represents the bit pattern 1101. On a computer with four CPUs, this indicates that ASP.NET processes can be scheduled on CPUs 0, 2, and 3, but not on CPU 1. ASP.NET launches one worker process for each qualified CPU. If the webGarden attribute is true, this attribute limits worker processes to the number of qualified CPUs. The maximum for worker processes is equal to the number of CPUs. If webGarden is false, this attribute is ignored and only one worker process will run. This is the default behavior.

The default is "0xffffffff".

 

---

enable

 

 

 

 

Specifies whether the process model is enabled.

The enable attribute can be one of the following values.

Value	Description
True	Indicates that the process model is enabled.
False	Indicates that the process model is not enabled.

The default is true.

 

---

 

idleTimeout

Specifies the period of inactivity, in the string format hr:min:sec, after which ASP.NET automatically ends the worker process.

The default is Infinite.

 

---

 

logLevel

Specifies event types to log to the event log.

The logLevel attribute can be one of the following values.

Value	Description
All	Specifies that all process events are logged.
Errors	Specifies that only unexpected shutdowns, memory limit shutdowns, and deadlock shutdowns are logged.
None	Specifies that no events are logged.

The default is Errors.

 

---

 

maxAppDomains

 

Specifies the maximum number of application domains that are allowed in one process.

This attribute can be less than or equal to 2000.

The default is 2000.

 

---

maxIoThreads

 

 

Configures the maximum number of I/O threads to use for the process on a per-CPU basis. For example, if this value is 25 on a single-processor server, ASP.NET uses the runtime APIs to set the process limit to 25. On a two-processor server, the limit is set to 50. The value of this attribute must be equal to or greater than the minFreeThread attribute setting in the httpRuntime configuration section.

For information about threading types, see "Threading Explained" in Improving ASP.NET Performance.

The range for this attribute is from 5 through 100.

The default is 20.

 

---

maxWorkerThreads

 

Configures the maximum amount of worker threads to use for the process on a per-CPU basis. For example, if this value is 25 on a single-processor server, ASP.NET uses the runtime APIs to set the process limit to 25. On a two-processor server, the limit is set to 50. The value of this attribute must be equal to or greater than the minFreeThread attribute setting in the httpRuntime configuration section.

For information about threading types, see "Threading Explained" in Improving ASP.NET Performance.

The range for this attribute is from 5 through 100.

The default is 20.

 

---

memoryLimit

 

Specifies the maximum allowed memory size, as a percentage of total system memory, that the worker process can consume before ASP.NET launches a new process and reassigns existing requests.

The default is 60.

 

---

minIoThreads

 

Configures the minimum number of I/O threads to use for the process on a per-CPU basis. Also see maxIoThreads.

For information about threading types, see "Threading Explained" in Improving ASP.NET Performance.

The default is 1.

 

---

 

 

 

 

 

minWorkerThreads

 

Configures the maximum amount of worker threads to use for the process on a per-CPU basis. Also see maxWorkerThreads.

For information about threading types, "Threading Explained" in Improving ASP.NET Performance.

The default is 1.

 

---

password

 

Causes, if present (and in conjunction with a userName), the worker process to run with the configured Microsoft Windows identity. See userName for more information about the special names System and Machine, which do not require a password, and for information about storing encrypted worker process credentials in the registry.

Note:
There are security risks associated with storing credentials in a configuration file. For more information, see "Storing a User Name and Password in the Registry" later in this document.

The default is AutoGenerate.

 

---

pingFrequency

 

Specifies the time interval, in standard process model format (hr:min:sec), at which the ISAPI extension pings the worker process to determine whether it is running. If it is not running for the pingTimeout interval, the worker process is restarted.

The default is Infinite.

 

---

pingTimeout

 

Specifies the time interval, in standard process model format (hr:min:sec), after which a responsive worker process that is not responding is restarted. The ISAPI extensions ping the worker process at the pingFrequency interval. If the worker process does not respond within the pingTimeout interval, the process is restarted.

The default is Infinite.

 

---

requestLimit

 

Specifies the number of requests that are allowed before ASP.NET automatically launches a new worker process to take the place of the current one.

The default is Infinite.

 

---

requestQueueLimit

 

Specifies the number of requests that are allowed in the queue before ASP.NET begins returning the message "503 – Server Too Busy" to new requests.

The default is 5000.

 

---

 

 

 

 

 

 

 

 

 

 

 

 

responseDeadlockInterval

 

Specifies the time interval, in standard process model format (hr:min:sec), after which the process is restarted, if the following conditions are met:

• There are queued requests.

• There has not been a response during this interval.

The default is "0:03:00" (3 minutes).

 

---

responseRestartDeadlockInterval

 

This attribute is no longer used by ASP.NET and is provided for compatibility only. It will not cause a configuration error, if it is already present in a configuration file. All recycling in the event of a deadlock condition is now controlled by the responseDeadlockInterval attribute.

The default is "0:03:00" (3 minutes).

 

---

 

 

 

 

restartQueueLimit

 

Specifies the maximum number of requests that are queued while waiting for the worker process to restart after a nonstandard termination. This setting does not apply in the case of a clean shutdown or standard restart.

The default is 10.

 

---

 

 

serverErrorMessageFile

 

Specifies the contents of a file to use instead of the default message "Server Unavailable" in the event of a fatal error. The file location is relative to the Machine.config file or it can be an absolute path. If this attribute is not present, the default message "Server Unavailable" is used.

 

---

shutdownTimeout

 

Specifies the number of minutes that are allowed for the worker process to shut down. When the time-out expires, ASP.NET shuts down the worker process. The time is expressed in hr:min:sec string format.

The default is "0:00:05" (5 seconds).

 

---

timeout

 

Specifies the number of minutes until ASP.NET launches a new worker process to take the place of the current one.

The default is Infinite.

 

---

userName

 

Specifies that ASP.NET will run the worker process with a Windows identity that is different from the Windows identity for the default process identity. By default, this attribute is set to the Machine, and the process runs under a user account named ASPNET that is created automatically when ASP.NET is installed. The password for the ASPNET account is cryptographically generated at the time of installation. If valid credentials are presented in this attribute and the password attribute, the process is run with the given account. One other value for userName is System, with the password AutoGenerate, which runs the process as an administrative account and allows all ASP.NET user code that is running under the process to have full administrative privileges. See "Remarks," later in this topic for information about using ASP.NET on a server that is a domain controller.

Note:

This attribute and the password attribute are stored in clear text in the configuration file. Although Microsoft Internet Information Services (IIS) do not transmit .config files in response to a user agent request, configuration files can be read by other means. For example, a configuration file can be read by an authenticated user with proper credentials on the domain for the server. For security reasons, the processModel section supports storage of encrypted userName and password attributes in the registry. The credentials must be in REG_BINARY format and encrypted by the Windows 2000 and Windows XP Data Protection API (DPAPI) encryption functions. For more information, see "Storing a User Name and Password in the Registry" later in this document.

The default is "machine".

 

---

webGarden

 

Controls CPU affinity when used in conjunction with the cpuMask attribute. (A multiprocessor Web server is called a Web garden).

The webGarden attribute can be one of the following values.

Value	Description
True	Indicates that the cpuMask attribute is used to specify which CPUs are qualified to run ASP.NET processes.
False	Indicates that CPU usage is scheduled by the Windows operating system. The cpuMask attribute is ignored and only one worker process is run.

The default is False.

 http://msdn.microsoft.com/en-us/7w2sway1%28zh-tw,VS.80%29.aspx

http://www.369xx.com/netjc/1111.html 

http://www.5ihll.com/iis/aaconprocessmodelelement.htm