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   <H1>[IRCServices] Rotate Log function - performance</H1>
    <B>Ian R. Justman</B> 
    <A HREF="mailto:ircservices%40ircservices.za.net?Subject=%5BIRCServices%5D%20Rotate%20Log%20function%20-%20performance&In-Reply-To=LPBBJLDCHCNGAKLLJFKNOEDMCEAA.markh%40eurodltd.co.uk"
       TITLE="[IRCServices] Rotate Log function - performance">ianj at esper.net
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    <I>Sat Mar  3 02:50:03 PST 2001</I>
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<PRE>On Mon, 26 Feb 2001, Mark Hetherington wrote:

&gt;<i> I am considering adding a rotate log function to services (and to the ircd
</I>&gt;<i> but that is beyond the scope of this list) which will automatically rotate
</I>&gt;<i> the log each day at Midnight but am looking for a low/no performance impact
</I>&gt;<i> determination that Midnight has occured.
</I>&gt;<i> 
</I>&gt;<i> The daylight build used to have an isMidnight function called in the &quot;main
</I>&gt;<i> loop&quot; but this rarely succeeded  I guess because if Services happened to be
</I>&gt;<i> idle or very busy at this time, Midnight passed before the isMidnight
</I>&gt;<i> function activated.
</I>&gt;<i> 
</I>&gt;<i> Eggdrop has a number of settings for automatic log rotation and after
</I>&gt;<i> investigation it uses
</I>&gt;<i> 
</I>&gt;<i>   add_hook(HOOK_SECONDLY, (Function) core_secondly);
</I>&gt;<i> 
</I>&gt;<i> with the per second function checking for Midnight among other things.
</I>&gt;<i> 
</I>&gt;<i> Having not used this system before I wonder as to what impact on performance
</I>&gt;<i> this may have on services. If anyone knows much about using per second
</I>&gt;<i> routines or what impact it might have on services it would be much
</I>&gt;<i> appreciated.
</I>
As has been suggested, use SIGUSR2.  Then let Cron deal with the &quot;per
second&quot; dickering to call a Perl/Python/Script/whatever script you may
write deal with the actual rotating.

As for precision, does the phrase, &quot;Measure with a micrometer, mark with
chalk, cut with an axe&quot; mean anything to you?  I don't know about you, but
I frankly don't much care.  Just as long as I can move logs out of the way
and keep my disk space somewhat manageable, that's all I ask.

I was the one who asked for this function.  Mainly because it's MUCH
easier to set up a cron event than to try to remember to get my butt onto
IRC and issue the rotatelog command.

In fact, many systems use this kind functionality notably with system
logs, including most Linux distros as well as FreeBSD and possibly the
other BSDs as well.  I figured something like this should be in Services
because the operating system already has tools which allow for periodic
scheduling; wny not use them? ;)  Plus it's pretty simple to whip up a
rotating script in Perl or even shell script.

Just my $.02.

--Ian R. Justman, Co-Founder and Postmaster, The EsperNet IRC Network.

-----
Ian R. Justman (NIC handle IJ12)  <A HREF="http://www.ircservices.za.net/mailman/listinfo/ircservices">ianj at esper.net</A> (Official EsperNet business)
Co-Founder and Postmaster, The EsperNet IRC Network
Server Administrator, chocobo.esper.net &quot;IJ&quot; on IRC

PGP key available upon request, or finger <A HREF="http://www.ircservices.za.net/mailman/listinfo/ircservices">ianj at esper.net.</A>

If this message was signed with the Postmaster's key, please finger
<A HREF="http://www.ircservices.za.net/mailman/listinfo/ircservices">postmaster at esper.net</A> for the Postmaster public key.

Type Bits/KeyID    Date       User ID
pub  1024/BAB34B69 1997/11/15 EsperNet Postmaster &lt;<A HREF="http://www.ircservices.za.net/mailman/listinfo/ircservices">postmaster at esper.net</A>&gt;
            Key fingerprint = 05 BD 7C B5 8E 0B FD EF  EE 47 49 C4 96 11 59 75


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	15	<B>Ian R. Justman</B>
	16	<A HREF="mailto:ircservices%40ircservices.za.net?Subject=%5BIRCServices%5D%20Rotate%20Log%20function%20-%20performance&In-Reply-To=LPBBJLDCHCNGAKLLJFKNOEDMCEAA.markh%40eurodltd.co.uk"
	17	TITLE="[IRCServices] Rotate Log function - performance">ianj at esper.net
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	19	<I>Sat Mar 3 02:50:03 PST 2001</I>
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	34	<PRE>On Mon, 26 Feb 2001, Mark Hetherington wrote:
	35
	36	><i> I am considering adding a rotate log function to services (and to the ircd
	37	</I>><i> but that is beyond the scope of this list) which will automatically rotate
	38	</I>><i> the log each day at Midnight but am looking for a low/no performance impact
	39	</I>><i> determination that Midnight has occured.
	40	</I>><i>
	41	</I>><i> The daylight build used to have an isMidnight function called in the "main
	42	</I>><i> loop" but this rarely succeeded I guess because if Services happened to be
	43	</I>><i> idle or very busy at this time, Midnight passed before the isMidnight
	44	</I>><i> function activated.
	45	</I>><i>
	46	</I>><i> Eggdrop has a number of settings for automatic log rotation and after
	47	</I>><i> investigation it uses
	48	</I>><i>
	49	</I>><i> add_hook(HOOK_SECONDLY, (Function) core_secondly);
	50	</I>><i>
	51	</I>><i> with the per second function checking for Midnight among other things.
	52	</I>><i>
	53	</I>><i> Having not used this system before I wonder as to what impact on performance
	54	</I>><i> this may have on services. If anyone knows much about using per second
	55	</I>><i> routines or what impact it might have on services it would be much
	56	</I>><i> appreciated.
	57	</I>
	58	As has been suggested, use SIGUSR2. Then let Cron deal with the "per
	59	second" dickering to call a Perl/Python/Script/whatever script you may
	60	write deal with the actual rotating.
	61
	62	As for precision, does the phrase, "Measure with a micrometer, mark with
	63	chalk, cut with an axe" mean anything to you? I don't know about you, but
	64	I frankly don't much care. Just as long as I can move logs out of the way
65	and keep my disk space somewhat manageable, that's all I ask.
66
67	I was the one who asked for this function. Mainly because it's MUCH
68	easier to set up a cron event than to try to remember to get my butt onto
69	IRC and issue the rotatelog command.
70
71	In fact, many systems use this kind functionality notably with system
72	logs, including most Linux distros as well as FreeBSD and possibly the
73	other BSDs as well. I figured something like this should be in Services
74	because the operating system already has tools which allow for periodic
75	scheduling; wny not use them? ;) Plus it's pretty simple to whip up a
76	rotating script in Perl or even shell script.
77
78	Just my $.02.
79
80	--Ian R. Justman, Co-Founder and Postmaster, The EsperNet IRC Network.
81
82	-----
83	Ian R. Justman (NIC handle IJ12) <A HREF="http://www.ircservices.za.net/mailman/listinfo/ircservices">ianj at esper.net</A> (Official EsperNet business)
84	Co-Founder and Postmaster, The EsperNet IRC Network
85	Server Administrator, chocobo.esper.net "IJ" on IRC
86
87	PGP key available upon request, or finger <A HREF="http://www.ircservices.za.net/mailman/listinfo/ircservices">ianj at esper.net.</A>
88
89	If this message was signed with the Postmaster's key, please finger
90	<A HREF="http://www.ircservices.za.net/mailman/listinfo/ircservices">postmaster at esper.net</A> for the Postmaster public key.
91
92	Type Bits/KeyID Date User ID
93	pub 1024/BAB34B69 1997/11/15 EsperNet Postmaster <<A HREF="http://www.ircservices.za.net/mailman/listinfo/ircservices">postmaster at esper.net</A>>
94	Key fingerprint = 05 BD 7C B5 8E 0B FD EF EE 47 49 C4 96 11 59 75
95
96
97
98	</PRE>
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