named pipes or files on disk?

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All=2C


I am new to the concept of named pipes on unix/linux


by using=20
use Fcntl=3B

will the named pipe transaction be faster than reading a file off the hd?

I am thinking a writing a daemon cron process=2C which a cgi process can at=
tach to
and read from memory=2C instead of file.



I dont want to use mod_perl.


Thanks in advance for your input.

Jeremy


=20
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All=2C


I am new to the concept of named pipes on unix/linux<=
br>

by using

use Fcntl=3B

w=

ill the named pipe transaction be faster than reading a file off the hd?
>
I am thinking a writing a daemon cron process=2C which a cgi process c=

an attach to
and read from memory=2C instead of file.



I d=

ont want to use mod_perl.


Thanks in advance for your input.
<=

br>Jeremy

RE: named pipes or files on disk?

From: activeperl-bounces@listserv.ActiveState.com
[mailto:activeperl-bounces@listserv.ActiveState.com] On Behalf Of Jer A
Sent: 19 April 2010 23:54
To: activeperl@listserv.activestate.com
Subject: named pipes or files on disk?

> All,
>
> I am new to the concept of named pipes on unix/linux
>
> by using
> use Fcntl;
> will the named pipe transaction be faster than reading a file off the
hd?
> I am thinking a writing a daemon cron process, which a cgi process can
attach to
> and read from memory, instead of file.
> I dont want to use mod_perl.

This smells a bit like an XY problem (see
), and I can't
immediately see what Fcntl has to do with pipes, named or otherwise. It
might help if we had more information about what you are trying to
accomplish. In any event, you might want to consider other IPC
mechanisms before pipes, like shared memory or sockets.

Also, bear in mind that if you are not using mod_perl, your CGI script,
and the Perl interpreter, will be read from disk for every request.
Unless reading that data file is time consuming for some reason (e.g. it
is huge, or remote), speeding it up may not improve the response time
for your HTTP request by very much.

HTH

--
Brian Raven

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RE: named pipes or files on disk?

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will accessing a html file=2C that is in the memory of a daemon=2C load as =
fast/faster
when accessed by the cgi script=2C through sockets?=2C than if the file was=
on disk?


Jeremy


> Subject: RE: named pipes or files on disk?
> Date: Wed=2C 21 Apr 2010 10:56:55 +0100
> From: BRaven@nyx.com
> To: activeperl@listserv.activestate.com
>=20
>=20
> From: activeperl-bounces@listserv.ActiveState.com
> [mailto:activeperl-bounces@listserv.ActiveState.com] On Behalf Of Jer A
> Sent: 19 April 2010 23:54
> To: activeperl@listserv.activestate.com
> Subject: named pipes or files on disk?
>=20
> > All=2C
> >=20
> > I am new to the concept of named pipes on unix/linux
> >=20
> > by using=20
> > use Fcntl=3B
> > will the named pipe transaction be faster than reading a file off the
> hd?
> > I am thinking a writing a daemon cron process=2C which a cgi process ca=
n
> attach to
> > and read from memory=2C instead of file.
> > I dont want to use mod_perl.
>=20
> This smells a bit like an XY problem (see
> )=2C and I can't
> immediately see what Fcntl has to do with pipes=2C named or otherwise. It
> might help if we had more information about what you are trying to
> accomplish. In any event=2C you might want to consider other IPC
> mechanisms before pipes=2C like shared memory or sockets.
>=20
> Also=2C bear in mind that if you are not using mod_perl=2C your CGI scrip=
t=2C
> and the Perl interpreter=2C will be read from disk for every request.
> Unless reading that data file is time consuming for some reason (e.g. it
> is huge=2C or remote)=2C speeding it up may not improve the response time
> for your HTTP request by very much.
>=20
> HTH
>=20
> --=20
> Brian Raven=20
>=20
> Please consider the environment before printing this email.
>=20
> This e-mail may contain confidential and/or privileged information. If yo=
u are not the intended recipient or have received this e-mail in error=2C p=
lease advise the sender immediately by reply e-mail and delete this message=
and any attachments without retaining a copy.
>=20
> Any unauthorised copying=2C disclosure or distribution of the material in=
this e-mail is strictly forbidden.
>=20
> _______________________________________________
> ActivePerl mailing list
> ActivePerl@listserv.ActiveState.com
> To unsubscribe: http://listserv.ActiveState.com/mailman/mysubs
=20
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will accessing a html file=2C that is in the memory of a daemon=2C load=
as fast/faster
when accessed by the cgi script=2C through sockets?=2C t=
han if the file was on disk?


Jeremy


>=3B Subject: R=
E: named pipes or files on disk?
>=3B Date: Wed=2C 21 Apr 2010 10:56:5=
5 +0100
>=3B From: BRaven@nyx.com
>=3B To: activeperl@listserv.ac=
tivestate.com
>=3B
>=3B
>=3B From: activeperl-bounces@list=
serv.ActiveState.com
>=3B [mailto:activeperl-bounces@listserv.ActiveSt=
ate.com] On Behalf Of Jer A
>=3B Sent: 19 April 2010 23:54
>=3B T=
o: activeperl@listserv.activestate.com
>=3B Subject: named pipes or fi=
les on disk?
>=3B
>=3B >=3B All=2C
>=3B >=3B
>=3B=
>=3B I am new to the concept of named pipes on unix/linux
>=3B >=
=3B
>=3B >=3B by using
>=3B >=3B use Fcntl=3B
>=3B >=
=3B will the named pipe transaction be faster than reading a file off the r>>=3B hd?
>=3B >=3B I am thinking a writing a daemon cron process=
=2C which a cgi process can
>=3B attach to
>=3B >=3B and read f=
rom memory=2C instead of file.
>=3B >=3B I dont want to use mod_perl=
..
>=3B
>=3B This smells a bit like an XY problem (see
>=3B =
<=3Bhttp://www.perlmonks.org/index.pl?node_id=3D542341>= 3B)=2C and I ca=
n't
>=3B immediately see what Fcntl has to do with pipes=2C named or o=
therwise. It
>=3B might help if we had more information about what you=
are trying to
>=3B accomplish. In any event=2C you might want to cons=
ider other IPC
>=3B mechanisms before pipes=2C like shared memory or s=
ockets.
>=3B
>=3B Also=2C bear in mind that if you are not using=
mod_perl=2C your CGI script=2C
>=3B and the Perl interpreter=2C will =
be read from disk for every request.
>=3B Unless reading that data fil=
e is time consuming for some reason (e.g. it
>=3B is huge=2C or remote=
)=2C speeding it up may not improve the response time
>=3B for your HT=
TP request by very much.
>=3B
>=3B HTH
>=3B
>=3B -- <=
br>>=3B Brian Raven
>=3B
>=3B Please consider the environment=
before printing this email.
>=3B
>=3B This e-mail may contain c=
onfidential and/or privileged information. If you are not the intended reci=
pient or have received this e-mail in error=2C please advise the sender imm=
ediately by reply e-mail and delete this message and any attachments withou=
t retaining a copy.
>=3B
>=3B Any unauthorised copying=2C disclo=
sure or distribution of the material in this e-mail is strictly forbidden.<=
br>>=3B
>=3B _______________________________________________
>=
=3B ActivePerl mailing list
>=3B ActivePerl@listserv.ActiveState.com r>>=3B To unsubscribe: http://listserv.ActiveState.com/mailman/mysubs
=

RE: named pipes or files on disk?

From: Jer A [mailto:jeremygwa@hotmail.com]
Sent: 23 April 2010 04:55
To: Brian Raven; activeperl@listserv.activestate.com
Subject: RE: named pipes or files on disk?

> It is for cache purposes. I don't want to be writing hundreds of
compiled pages to disk, and I need a > solution that does not depend on
a database...so that is why I've chosen to write a daemon.

That doesn't really answer my question (i.e. what advantage do you
expect a daemon to give you over the simply reading files from disk?),
but it does add a couple of additional snippets, namely "hundreds of
compiled pages" and "not depend on a database".

--
Brian Raven

Please consider the environment before printing this email.

This e-mail may contain confidential and/or privileged information. If you are not the intended recipient or have received this e-mail in error, please advise the sender immediately by reply e-mail and delete this message and any attachments without retaining a copy.

Any unauthorised copying, disclosure or distribution of the material in this e-mail is strictly forbidden.

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