memory locking
Eric S. Raymond
esr at thyrsus.com
Sun Jul 3 09:30:03 UTC 2016
Hal Murray <hmurray at megapathdsl.net>:
>
> esr at thyrsus.com said:
> > I'm not sure what the referent of "that" is. The statistics-gathering I've
> > seen seems to be all about writing line-at-a-time records to various stats
> > files; I can't see that generating a lot of memory pressure.
>
> > If there's somewhere in the code that is allocating memory proportional to
> > the size of saved statistics, yes that could be a problem. Do you have some
> > specific case in mind?
>
> Different context for statistics. The MRU list keeps tracks of traffic from
> each IP Address. It's in the misc options page under "mru". You can see it
> with ntpq -c mrulist.
esr at snark:~/software/ntp-rescue/ntpsec$ ntpq -c mrulist
***Command `mrulist' unknown
esr at snark:~/software/ntp-rescue/ntpsec$ ntpq
ntpq> ?
ntpq commands:
:config delay mreadvar readlist
addvars exit mrl readvar
associations help mrv rl
authenticate host ntpversion rmvars
cl hostnames opeers rv
clearvars keyid passociations saveconfig
clocklist keytype passwd showvars
clockvar lassociations peers timeout
config-from-file lopeers poll version
cooked lpassociations pstatus writelist
cv lpeers quit writevar
debug mreadlist raw
Name must have changed. But I remember seeing the code for that. Looking in
ntp_control.c...looks like memory used used is O(n) in the number of peers.
esr at snark:~/software/ntp-rescue/ntpsec$ ntpq -c mrulist
***Command `mrulist' unknown
esr at snark:~/software/ntp-rescue/ntpsec$ ntpq
ntpq> ?
ntpq commands:
:config delay mreadvar readlist
addvars exit mrl readvar
associations help mrv rl
authenticate host ntpversion rmvars
cl hostnames opeers rv
clearvars keyid passociations saveconfig
clocklist keytype passwd showvars
clockvar lassociations peers timeout
config-from-file lopeers poll version
cooked lpassociations pstatus writelist
cv lpeers quit writevar
debug mreadlist raw
Name must have changed?
--
<a href="http://www.catb.org/~esr/">Eric S. Raymond</a>
--
<a href="http://www.catb.org/~esr/">Eric S. Raymond</a>
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