Apache concurrency control, view number of processes, TCP connections, compression feature description

One: Apache related concurrency control

Mainly prefork and worker two one to control. We can use HTTPD-L to determine whether the MPM currently in use is PREFORK.C or WORKER.C.

# httpd-l
Compiled in Modules:
Core.c
Prefork.c
Http_core.c
Mod_so.c

The associated configuration can be found in the httpd.conf

Two: View the number of httpd processes (that is, the number of concurrent requests that Apache can handle in prefork mode):

Ps-ef | grep httpd | Wc–l

The result is the number of concurrent requests currently being processed by Apache, which is automatically tuned according to the load.

Three: View the number of concurrent requests for Apache and its TCP connection status

Netstat-n | awk '/^tcp/{++s[$NF]} end {for (a in S) print A,s[a]} '

Return sample results:

Last_ack 5
SYN_RECV 30
Established 1597
Fin_wait1 51
Fin_wait2 504
Time_wait 1057

The SYN_RECV represents the number of requests waiting to be processed, established represents the normal data transfer status, and Time_wait represents the number of requests that have been processed and waiting for the timeout to end.

Status: Description

CLOSED: No connection is active or in progress

LISTEN: The server is waiting to enter the call

SYN_RECV: A connection request has arrived, waiting for confirmation

Syn_sent: Application has started, open a connection

Established: Normal data transfer status

FIN_WAIT1: Application says it's done

Fin_wait2: The other side has agreed to release

Itmed_wait: Waiting for all groups to die

CLOSING: Both sides try to close at the same time

Time_wait: The other side has initialized a release

Last_ack: Waiting for all groups to die

You can use Webbench under Linux for stress testing.

Extendedstatus on because the extra time sign is written, set off.

Four: Check to see if Apache supports the compression function:

Modules that must be loaded in the http.conf:

LoadModule Headers_module
#modules/mod_headers.so
LoadModule Deflate_module
#modules/mod_deflate.so

Add the following code:

(

Addoutputfilterbytype DEFLATE text/html text/plain text/css application/x-httpd-php application/x-javascript text/css

Deflatecompressionlevel 6

Setoutputfilter DEFLATE

#DeflateFilterNote Input instream

#DeflateFilterNote Output OutStream

#DeflateFilterNote Ratio Ratio

#LogFormat ' "%r"%{outstream}n/%{instream}n (%{ratio}n%%) ' deflate

#CustomLog Logs/deflate_log.log Deflate

)

Perfect part:

Addoutputfilterbytype DEFLATE text/html text/plain text/css application/x-httpd-php application/x-javascript text/css

Addoutputfilter DEFLATE CSS #压缩css文件

Addoutputfilter DEFLATE JS #压缩js文件

# Don ' t compress images #对照片文件不进行压缩处理

Setenvifnocase Request_uri (?: gif|jpe?g|png) $ no-gzip dont-vary

Setenvifnocase Request_uri (?: Exe|t?gz|zip|bz2|sit|rar) $ no-gzip dont-vary

Setenvifnocase Request_uri. pdf$ no-gzip dont-vary

#SetEnvIfNoCase Request_uri. (CSS|JS) $ no-gzip dont-vary

# Make sure proxies don ' t deliver the wrong content

Header Append Vary user-agent env=!dont-vary

Deflatecompressionlevel 6

Setoutputfilter DEFLATE

#DeflateFilterNote Input instream

#DeflateFilterNote Output OutStream

#DeflateFilterNote Ratio Ratio

#LogFormat ' "%r"%{outstream}n/%{instream}n (%{ratio}n%%) ' deflate

#CustomLog Logs/deflate_log.log Deflate

php.ini compression mechanism configuration location: is closed by default.

#vi/etc/php.ini
=================================================
Output_buffering = Off
Output_handler =
Zlib.output_compression = Off