01-13-2009
Apache 2.2 on Ubuntu 8.10
Hello,
Does anyone know or know how to check if the Apache 2.2 version you can get with the Synaptic Package manager in Ubuntu 8.10has been optimized for 486 or higher processors?
I would think one would have to optimize the executable for 486 or higher processer baed on the Apache optimization guide below. I am a little new to Apache so I do not know if I have to do what they say below since I run on a processor greater than a 496(it is a little confuzing). Any advice?
Atomic Operations
Some modules, such as mod_cache and recent development builds of the worker MPM, use APR's atomic API. This API provides atomic operations that can be used for lightweight thread synchronization.
By default, APR implements these operations using the most efficient mechanism available on each target OS/CPU platform. Many modern CPUs, for example, have an instruction that does an atomic compare-and-swap (CAS) operation in hardware. On some platforms, however, APR defaults to a slower, mutex-based implementation of the atomic API in order to ensure compatibility with older CPU models that lack such instructions. If you are building Apache for one of these platforms, and you plan to run only on newer CPUs, you can select a faster atomic implementation at build time by configuring Apache with the --enable-nonportable-atomics option:
./buildconf
./configure --with-mpm=worker --enable-nonportable-atomics=yes
The --enable-nonportable-atomics option is relevant for the following platforms:
* Solaris on SPARC
By default, APR uses mutex-based atomics on Solaris/SPARC. If you configure with --enable-nonportable-atomics, however, APR generates code that uses a SPARC v8plus opcode for fast hardware compare-and-swap. If you configure Apache with this option, the atomic operations will be more efficient (allowing for lower CPU utilization and higher concurrency), but the resulting executable will run only on UltraSPARC chips.
* Linux on x86
By default, APR uses mutex-based atomics on Linux. If you configure with --enable-nonportable-atomics, however, APR generates code that uses a 486 opcode for fast hardware compare-and-swap. This will result in more efficient atomic operations, but the resulting executable will run only on 486 and later chips (and not on 386).
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LEARN ABOUT DEBIAN
apache::session::postgres
Apache::Session::Postgres(3pm) User Contributed Perl Documentation Apache::Session::Postgres(3pm)
NAME
Apache::Session::Postgres - An implementation of Apache::Session
SYNOPSIS
use Apache::Session::Postgres;
#if you want Apache::Session to open new DB handles:
tie %hash, 'Apache::Session::Postgres', $id, {
DataSource => 'dbi:Pg:dbname=sessions',
UserName => $db_user,
Password => $db_pass,
Commit => 1
};
#or, if your handles are already opened:
tie %hash, 'Apache::Session::Postgres', $id, {
Handle => $dbh,
Commit => 1
};
DESCRIPTION
This module is an implementation of Apache::Session. It uses the Postgres backing store and no locking. See the example, and the
documentation for Apache::Session::Store::Postgres for more details.
USAGE
The special Apache::Session argument for this module is Commit. You MUST provide the Commit argument, which instructs this module to
either commit the transaction when it is finished, or to simply do nothing. This feature is provided so that this module will not have
adverse interactions with your local transaction policy, nor your local database handle caching policy. The argument is mandatory in order
to make you think about this problem.
AUTHOR
This module was written by Jeffrey William Baker <jwbaker@acm.org>.
SEE ALSO
Apache::Session::File, Apache::Session::Flex, Apache::Session::DB_File, Apache::Session::Postgres, Apache::Session
perl v5.10.1 2010-10-18 Apache::Session::Postgres(3pm)