These configuration parameters control the Advanced Fast Path Architecture (AFPA) feature
in IBM® HTTP
Server.
The fast response cache accelerator (FRCA) utilizes a special high-performance component, based
on the IBM Advanced
Fast Path Architecture, from which the AFPA prefix is derived. You can configure FRCA for IPV4. IPV6
is not supported.
![[AIX]](../images/ngaix.svg)
AfpaBindLogger directive
Use the AfpaBindLogger directive to bind the fast response cache accelerator (FRCA) logging
thread in the kernel to a specific processor.
The format of the command is AfpaBindLogger [-1, 0, 1, ..., n], where -1 leaves the logging
thread unbound and a number from 0 to total number of processors on the system, binds the logging
thread to that processor.
| Directive |
Description |
| Scope |
One per physical Apache server |
| Default |
(-1) |
| Notes |
Valid on AIX®
operating systems only. |
![[Windows]](../images/ngwin.svg)
AfpaCache directive
The AfpaCache directive turns the fast response cache accelerator (FRCA) on or off for a
particular scope (such as a directory). The AfpaCache directive applies to all descendants in a
scope, unless otherwise modified by another directive.
| Directive |
Description |
| Scope |
Server configuration, virtual host, directory |
| Syntax |
On or off |
| Usage |
AfpaCache on |
| Override |
Options |
| Multiple instances in the configuration file |
Allowed |
| Notes |
Valid on Windows 32-bit and AIX operating systems. |
AfpaDynacacheMax directive
The AfpaDynacacheMax directive is used on Windows operating systems to control the total amount of
memory utilized for caching servlets and JavaServer Pages files.
When static files are cached, there is very little overhead for each entry since the file itself
does not take up space in the cache, just the file handle. However, for servlets and JavaServer
Pages files, the body of the response is stored in physical memory, so care must be taken to avoid
consuming all available memory. Without this directive, the fast response cache accelerator will
automatically set the upper-bound to be approximately one eighth of physical memory. Use the
directive to override that default.
| Directive |
Description |
| Syntax |
AfpaDynacacheMax size (Megabytes) |
| Scope |
One per physical Apache server |
| Notes |
Valid on Windows 32-bit operating systems |
AfpaEnable directive
The AfpaEnable directive enables the fast response cache accelerator (FRCA). If the AfpaEnable
directive is present and mod_afpa_cache.so is loaded, FRCA listens on the port specified by the
AfpaPort directive.
| Directive |
Description |
| Syntax |
AfpaEnable |
| Scope |
One per physical Apache server |
| Notes |
Valid on AIX
and Windows operating systems. |
AfpaLogFile directive
The AfpaLogFile directive defines the fast response cache accelerator (FRCA) log file name,
location, and logging format.
| Directive |
Description |
| Scope |
One per physical Apache server |
| Syntax |
AfpaLogFile log_file_name [CLF | ECLF | V-CLF | V-ECLF| BINARY] |
| Notes |
Valid on AIX
and Windows 32-bit operating systems. On Windows 32-bit operating systems, the current date is used as
the file type for the log file, and the log file is automatically rolled over at midnight each
day. |
The log formats are as follows:
- CLF = Common Log Format
- ECLF = Extended Common Log Format
- V-CLF = Common Log Format with virtual host information
- V-ECLF = Extended Common Log Format with virtual host information
- BINARY = Binary log with virtual host information
AfpaLogging directive
The AfpaLogging directive turns the fast response cache accelerator (FRCA) logging on or
off.
| Directive |
Description |
| Scope |
One per physical Apache server |
| Syntax |
AfpaLogging On | Off |
| Notes |
Valid only on AIX operating systems. |
AfpaMaxCache directive
The AfpaMaxCache directive specifies the maximum file size inserted into the fast response cache
accelerator (FRCA) cache.
| Directive |
Description |
| Syntax |
AfpaMaxCache [size (bytes)] |
| Scope |
One per physical Apache server |
| Default |
none |
| Notes |
Valid only on AIX operating systems. |
AfpaMinCache directive
The AfpaMinCache directive specifies the minimum file size inserted into the fast response cache
accelerator (FRCA) cache.
| Directive |
Description |
| Syntax |
AfpaMinCache [size] |
| Scope |
One per physical Apache server |
| Default |
none |
| Notes |
Valid only on AIX operating systems. |
AfpaPort directive
The AfpaPort directive tells the FRCA on which TCP port to listen. The AfpaPort directive issues
a listen command for all TCP network adapters that are active on the server machine. The listen
command is effective for all TCP addresses.
| Directive |
Description |
| Syntax |
AfpaPort port number |
| Scope |
One directive per server |
| Notes |
Valid only on AIX and Windows 32-bit operating systems |
AfpaRevalidationTimeout directive
The AfpaRevalidationTimeout directive sets the time interval for revalidation of a cached object.
When the RevalidationTimeout is exceeded for a cached object, a fresh copy is cached.
| Directive |
Description |
| Syntax |
AfpaRevalidationTimeout [value] |
| Scope |
Global |
| Default |
60 seconds |
| Notes |
Valid on AIX
operating systems only. |