Re: Apache + mod_php performance

On 9/26/2024 10:30 AM, Craig A. Berry wrote:

On 9/26/24 7:38 AM, Craig A. Berry wrote:

On 9/25/24 6:14 PM, Arne Vajhøj wrote:

Does anyone know internals of Apache on VMS?
>
Based on some messages in error_log it looks like
it uses mailboxes APACHE$AWS_CONTROL_MBX_nn.
>
If every request result in mailbox comm between
master process and a child process, then that could
slow down things.

>
I vaguely remember that there was a separate image installed with
privileges that increased socket buffer size from 255 bytes to something
reasonable and these sockets were used as pipes for IPC.
>
The following links still seem to work if you want (old) sources:
>
https://ftp.hp.com/pub/openvms/apache/CSWS-V20-2-ALPHA-SRC- KIT.BCK_SFX_AXPEXE
>
https://ftp.hp.com/pub/openvms/apache/CSWS-V20-2-I64-SRC- KIT.BCK_SFX_I64EXE

 Trial and error shows that *slightly* later versions are available at
the same place:
 https://ftp.hp.com/pub/openvms/apache/CSWS-V21-1-ALPHA-SRC- KIT.BCK_SFX_AXPEXE
 https://ftp.hp.com/pub/openvms/apache/CSWS-V21-1-I64-SRC-KIT.BCK_SFX_I64EXE

I took a look.
It has:
[.httpd.server.mpm.prefork]prefork.c with 1350 lines calling fork
[.httpd.server.mpm.vms]prefork.c with 3900 lines calling sys$creprc
So it looks like the porting approach was to reimplement prefork
more or less from scratch for VMS.
A very quick search make me think that the mailbox is only used
for control not for data.
So I am still stuck.
Arne