From: Noel Jones on
Is postscreen supposed to always run with stress=yes?
Seems to me stress-adaptive behavior would be useful in
postscreen.

# postconf mail_version
mail_version = 2.7-20100102

# ps -aux|grep stress
postfix 19967 0.0 1.0 23508 15444 ?? I 12:50PM
0:00.76 smtpd -t pass -u -o stress= -o
content_filter=amavis-smtp:[1
postfix 19969 0.0 1.0 23508 15484 ?? I 12:50PM
0:00.90 smtpd -t pass -u -o stress= -o
content_filter=amavis-smtp:[1
postfix 20637 0.0 0.1 3028 1704 ?? Ss 1:32PM 0:00.01
postscreen -l -n smtp -t inet -u -o stress=yes

(under light load)


Did I miss some docs or earlier discussion about this?

-- Noel Jones

From: Victor Duchovni on
On Wed, Jan 13, 2010 at 01:44:05PM -0600, Noel Jones wrote:

> Is postscreen supposed to always run with stress=yes?
> Seems to me stress-adaptive behavior would be useful in postscreen.
>
> postfix 20637 0.0 0.1 3028 1704 ?? Ss 1:32PM 0:00.01 postscreen
> -l -n smtp -t inet -u -o stress=yes

There is only one process, so it is always at full occupancy, the
stress=yes is an artifact, and should not be taken seriously in this case.
Perhaps the master daemon can be changed to special-case services with
a process limit of 1.

--
Viktor.

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From: Wietse Venema on
Noel Jones:
> Is postscreen supposed to always run with stress=yes?
> Seems to me stress-adaptive behavior would be useful in
> postscreen.

The stress=yes setting indicates that a master.cf service is using
up all its process slots. It is applicable only for servers that
accept connections from remote clients.

By design, postscreen runs as a single process. The stress=yes
parameter value therefore carries no useful information. Either
the postscreen service is not running at all, or it uses up all
its process slots because there is only one.

I could make a special case for single-process servers in master.cf
so that they don't have a stress parameter.

Wietse

*** ./master_ent.c- Sat Jan 10 19:02:29 2009
--- ./master_ent.c Wed Jan 13 15:04:47 2010
***************
*** 526,532 ****
argv_add(serv->args, "-u", (char *) 0);
if (chroot)
argv_add(serv->args, "-c", (char *) 0);
! if ((serv->flags & MASTER_FLAG_LOCAL_ONLY) == 0) {
argv_add(serv->args, "-o", "stress=" CONFIG_BOOL_YES, (char *) 0);
serv->stress_param_val =
serv->args->argv[serv->args->argc - 1] + sizeof("stress=") - 1;
--- 526,532 ----
argv_add(serv->args, "-u", (char *) 0);
if (chroot)
argv_add(serv->args, "-c", (char *) 0);
! if ((serv->flags & MASTER_FLAG_LOCAL_ONLY) == 0 && serv->max_proc > 1) {
argv_add(serv->args, "-o", "stress=" CONFIG_BOOL_YES, (char *) 0);
serv->stress_param_val =
serv->args->argv[serv->args->argc - 1] + sizeof("stress=") - 1;

From: Noel Jones on
On 1/13/2010 2:06 PM, Wietse Venema wrote:
> Noel Jones:
>> Is postscreen supposed to always run with stress=yes?
>> Seems to me stress-adaptive behavior would be useful in
>> postscreen.
>
> The stress=yes setting indicates that a master.cf service is using
> up all its process slots. It is applicable only for servers that
> accept connections from remote clients.
>
> By design, postscreen runs as a single process. The stress=yes
> parameter value therefore carries no useful information. Either
> the postscreen service is not running at all, or it uses up all
> its process slots because there is only one.
>
> I could make a special case for single-process servers in master.cf
> so that they don't have a stress parameter.

OK, I think I understand it better now. I would find it less
confusing without the stress=yes in the process listing.

Thanks to you and Viktor for the quick response.

-- Noel Jones