git.tokkee.org Git - rrdtool-all.git/log

oetiker [Fri, 4 Jan 2008 22:53:46 +0000 (22:53 +0000)]

fontmap resolution was not matching scaled_font resolution ... this killed layouting ... much better now

git-svn-id: svn://svn.oetiker.ch/rrdtool/trunk@1264 a5681a0c-68f1-0310-ab6d-d61299d08faa

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oetiker [Thu, 3 Jan 2008 21:30:59 +0000 (21:30 +0000)]

get rid of DASHED, only use dashes syntax. less redundancy -- thomas.gutzler gmail.com

git-svn-id: svn://svn.oetiker.ch/rrdtool/trunk@1263 a5681a0c-68f1-0310-ab6d-d61299d08faa

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oetiker [Wed, 2 Jan 2008 22:11:26 +0000 (22:11 +0000)]

support for dashed lines in graphs

git-svn-id: svn://svn.oetiker.ch/rrdtool/trunk@1262 a5681a0c-68f1-0310-ab6d-d61299d08faa

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oetiker [Wed, 2 Jan 2008 22:06:24 +0000 (22:06 +0000)]

fix indenting

git-svn-id: svn://svn.oetiker.ch/rrdtool/trunk@1261 a5681a0c-68f1-0310-ab6d-d61299d08faa

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oetiker [Wed, 2 Jan 2008 22:06:16 +0000 (22:06 +0000)]

ignore errors with txt doc building

git-svn-id: svn://svn.oetiker.ch/rrdtool/trunk@1260 a5681a0c-68f1-0310-ab6d-d61299d08faa

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oetiker [Tue, 11 Dec 2007 23:41:21 +0000 (23:41 +0000)]

building the docs depends on the presence of pod2man ... which does not seem to be installed necessarily

git-svn-id: svn://svn.oetiker.ch/rrdtool/trunk@1255 a5681a0c-68f1-0310-ab6d-d61299d08faa

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oetiker [Sat, 8 Dec 2007 22:15:22 +0000 (22:15 +0000)]

added shared library locations into the docs

git-svn-id: svn://svn.oetiker.ch/rrdtool/trunk@1253 a5681a0c-68f1-0310-ab6d-d61299d08faa

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oetiker [Sat, 8 Dec 2007 21:35:51 +0000 (21:35 +0000)]

include stdlib since putenv is in there on solaris

git-svn-id: svn://svn.oetiker.ch/rrdtool/trunk@1252 a5681a0c-68f1-0310-ab6d-d61299d08faa

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oetiker [Sat, 8 Dec 2007 16:57:04 +0000 (16:57 +0000)]

fixing solaris portability
* isinf and isnan definitions fixed
* check if rt must be linked
* ordering must be read write in getopt
* updated build instructions

git-svn-id: svn://svn.oetiker.ch/rrdtool/trunk@1251 a5681a0c-68f1-0310-ab6d-d61299d08faa

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oetiker [Sun, 2 Dec 2007 17:11:09 +0000 (17:11 +0000)]

fixed spelling

git-svn-id: svn://svn.oetiker.ch/rrdtool/trunk@1249 a5681a0c-68f1-0310-ab6d-d61299d08faa

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oetiker [Sun, 2 Dec 2007 16:59:03 +0000 (16:59 +0000)]

initial text

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oetiker [Mon, 26 Nov 2007 20:12:11 +0000 (20:12 +0000)]

fix libdir for python build

git-svn-id: svn://svn.oetiker.ch/rrdtool/trunk@1247 a5681a0c-68f1-0310-ab6d-d61299d08faa

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oetiker [Wed, 21 Nov 2007 10:51:48 +0000 (10:51 +0000)]

fixed NetBSD spelling

git-svn-id: svn://svn.oetiker.ch/rrdtool/trunk@1244 a5681a0c-68f1-0310-ab6d-d61299d08faa

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oetiker [Wed, 21 Nov 2007 06:56:19 +0000 (06:56 +0000)]

define bsd source to get access to chroot

git-svn-id: svn://svn.oetiker.ch/rrdtool/trunk@1241 a5681a0c-68f1-0310-ab6d-d61299d08faa

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oetiker [Wed, 21 Nov 2007 06:47:17 +0000 (06:47 +0000)]

make perlbuild more portable

git-svn-id: svn://svn.oetiker.ch/rrdtool/trunk@1240 a5681a0c-68f1-0310-ab6d-d61299d08faa

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oetiker [Wed, 21 Nov 2007 05:54:42 +0000 (05:54 +0000)]

initial checkin

git-svn-id: svn://svn.oetiker.ch/rrdtool/trunk@1239 a5681a0c-68f1-0310-ab6d-d61299d08faa

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oetiker [Tue, 20 Nov 2007 22:22:31 +0000 (22:22 +0000)]

enable madvise defines in netbsd

git-svn-id: svn://svn.oetiker.ch/rrdtool/trunk@1238 a5681a0c-68f1-0310-ab6d-d61299d08faa

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oetiker [Tue, 20 Nov 2007 00:17:18 +0000 (00:17 +0000)]

added 1.2.26

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oetiker [Tue, 20 Nov 2007 00:08:20 +0000 (00:08 +0000)]

remove last traces of rrd_nan_inf.h
fix handling of min==max where min < 0

git-svn-id: svn://svn.oetiker.ch/rrdtool/trunk@1234 a5681a0c-68f1-0310-ab6d-d61299d08faa

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oetiker [Mon, 19 Nov 2007 19:05:25 +0000 (19:05 +0000)]

spell checked

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oetiker [Mon, 19 Nov 2007 19:02:54 +0000 (19:02 +0000)]

added report

git-svn-id: svn://svn.oetiker.ch/rrdtool/trunk@1230 a5681a0c-68f1-0310-ab6d-d61299d08faa

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oetiker [Thu, 15 Nov 2007 14:39:56 +0000 (14:39 +0000)]

re-indented files that have gone out of indent-style over the last few weeks

git-svn-id: svn://svn.oetiker.ch/rrdtool/trunk@1228 a5681a0c-68f1-0310-ab6d-d61299d08faa

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oetiker [Thu, 15 Nov 2007 14:36:39 +0000 (14:36 +0000)]

integrate rrd_nan_inf header

git-svn-id: svn://svn.oetiker.ch/rrdtool/trunk@1227 a5681a0c-68f1-0310-ab6d-d61299d08faa

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oetiker [Thu, 15 Nov 2007 14:35:15 +0000 (14:35 +0000)]

Improve layout of documentation. -- Bernhard Fischer

git-svn-id: svn://svn.oetiker.ch/rrdtool/trunk@1226 a5681a0c-68f1-0310-ab6d-d61299d08faa

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oetiker [Thu, 15 Nov 2007 14:34:14 +0000 (14:34 +0000)]

*  rrd_update(): Unify error path.
*  parse_template(): Likewise.
*  allocate_data_structures(): Make error strings use consistent punctuation.
-- bernhard fischer

git-svn-id: svn://svn.oetiker.ch/rrdtool/trunk@1225 a5681a0c-68f1-0310-ab6d-d61299d08faa

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oetiker [Thu, 15 Nov 2007 14:32:37 +0000 (14:32 +0000)]

make sure this compiles with aix

git-svn-id: svn://svn.oetiker.ch/rrdtool/trunk@1224 a5681a0c-68f1-0310-ab6d-d61299d08faa

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oetiker [Tue, 13 Nov 2007 01:45:33 +0000 (01:45 +0000)]

lisa update

git-svn-id: svn://svn.oetiker.ch/rrdtool/trunk@1214 a5681a0c-68f1-0310-ab6d-d61299d08faa

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oetiker [Thu, 8 Nov 2007 10:16:27 +0000 (10:16 +0000)]

fixed start end time in ruby fetch and added step size -- Mike Perham mperham gmail

git-svn-id: svn://svn.oetiker.ch/rrdtool/trunk@1213 a5681a0c-68f1-0310-ab6d-d61299d08faa

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oetiker [Tue, 6 Nov 2007 21:27:52 +0000 (21:27 +0000)]

updated build instructions

git-svn-id: svn://svn.oetiker.ch/rrdtool/trunk@1211 a5681a0c-68f1-0310-ab6d-d61299d08faa

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oetiker [Sun, 4 Nov 2007 21:56:19 +0000 (21:56 +0000)]

handle errors properly ... in RRDp read call

git-svn-id: svn://svn.oetiker.ch/rrdtool/trunk@1209 a5681a0c-68f1-0310-ab6d-d61299d08faa

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oetiker [Mon, 8 Oct 2007 14:36:43 +0000 (14:36 +0000)]

fixed name for release

git-svn-id: svn://svn.oetiker.ch/rrdtool/trunk@1208 a5681a0c-68f1-0310-ab6d-d61299d08faa

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oetiker [Mon, 8 Oct 2007 14:36:19 +0000 (14:36 +0000)]

getting ready for release

git-svn-id: svn://svn.oetiker.ch/rrdtool/trunk@1207 a5681a0c-68f1-0310-ab6d-d61299d08faa

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oetiker [Sun, 16 Sep 2007 15:35:11 +0000 (15:35 +0000)]

no reason to die when posixfadvise is not sucessful

git-svn-id: svn://svn.oetiker.ch/rrdtool/trunk@1204 a5681a0c-68f1-0310-ab6d-d61299d08faa

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oetiker [Tue, 11 Sep 2007 06:28:15 +0000 (06:28 +0000)]

Allow to the the smoothing window size other thatn the default 5%.
-- Evan Miller emiller imvu.com

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oetiker [Tue, 11 Sep 2007 06:16:52 +0000 (06:16 +0000)]

added msync before unmap

git-svn-id: svn://svn.oetiker.ch/rrdtool/trunk@1202 a5681a0c-68f1-0310-ab6d-d61299d08faa

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oetiker [Sat, 8 Sep 2007 05:23:23 +0000 (05:23 +0000)]

added STDEV aggregation function for VDEF. -- Patrick J Cherry patrick bytemark.co.uk

git-svn-id: svn://svn.oetiker.ch/rrdtool/trunk@1201 a5681a0c-68f1-0310-ab6d-d61299d08faa

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oetiker [Fri, 7 Sep 2007 22:53:41 +0000 (22:53 +0000)]

a few leanups -- Bernhard Fischer

git-svn-id: svn://svn.oetiker.ch/rrdtool/trunk@1200 a5681a0c-68f1-0310-ab6d-d61299d08faa

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oetiker [Thu, 6 Sep 2007 09:06:04 +0000 (09:06 +0000)]

added missing ;

git-svn-id: svn://svn.oetiker.ch/rrdtool/trunk@1199 a5681a0c-68f1-0310-ab6d-d61299d08faa

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oetiker [Thu, 6 Sep 2007 08:42:22 +0000 (08:42 +0000)]

* mimic write() and read() even better -- Bernhard Fischer

git-svn-id: svn://svn.oetiker.ch/rrdtool/trunk@1198 a5681a0c-68f1-0310-ab6d-d61299d08faa

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oetiker [Thu, 6 Sep 2007 08:40:36 +0000 (08:40 +0000)]

rrd_open.c (rrd_read): Mimicing read() behaviour for EOF case and NULL buffer case.
-- Bernhard Fischer

git-svn-id: svn://svn.oetiker.ch/rrdtool/trunk@1197 a5681a0c-68f1-0310-ab6d-d61299d08faa

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oetiker [Sun, 2 Sep 2007 16:55:01 +0000 (16:55 +0000)]

fixed speling of horizon

git-svn-id: svn://svn.oetiker.ch/rrdtool/trunk@1196 a5681a0c-68f1-0310-ab6d-d61299d08faa

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oetiker [Wed, 29 Aug 2007 06:43:16 +0000 (06:43 +0000)]

a better performance tester

git-svn-id: svn://svn.oetiker.ch/rrdtool/trunk@1194 a5681a0c-68f1-0310-ab6d-d61299d08faa

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oetiker [Thu, 16 Aug 2007 07:31:53 +0000 (07:31 +0000)]

added holt winters example back into the examples documentation

git-svn-id: svn://svn.oetiker.ch/rrdtool/trunk@1193 a5681a0c-68f1-0310-ab6d-d61299d08faa

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oetiker [Tue, 14 Aug 2007 21:59:31 +0000 (21:59 +0000)]

Fix for HoltWinters phase-shift bug described below.

When one or more primary data point times were missed, the SEASONAL and
DEVSEASONAL archives were marked as being up-to-date, so that they would not
be written to. It was correct not to write to these archives, but the code
failed to advance the pointers within the SEASONAL and DEVSEASONAL archives
so that future updates would go to the correct location in the archives.

Rather than mark these archives as up-to-date (by setting
rra_step_cnt[rra_idx] = 0), my patch allocates a new "skip_update" array
that is set to 1 for SEASONAL and DEVSEASONAL archives that have missed one
or more primary data points. When an RRA is written to, the cur_row pointer
advancement happens for all archives, but the skip_update array is checked
just before actually writing out the changes.

Please give it a whirl!
-- Evan Miller emiller imvu.com

git-svn-id: svn://svn.oetiker.ch/rrdtool/trunk@1192 a5681a0c-68f1-0310-ab6d-d61299d08faa

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oetiker [Mon, 13 Aug 2007 20:06:10 +0000 (20:06 +0000)]

Refactored rrd_update code in preparation of finding the HW update
problem -- Evan Miller

git-svn-id: svn://svn.oetiker.ch/rrdtool/trunk@1191 a5681a0c-68f1-0310-ab6d-d61299d08faa

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oetiker [Tue, 7 Aug 2007 15:02:08 +0000 (15:02 +0000)]

updated build instructions for 1.3

git-svn-id: svn://svn.oetiker.ch/rrdtool/trunk@1190 a5681a0c-68f1-0310-ab6d-d61299d08faa

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oetiker [Fri, 3 Aug 2007 23:46:05 +0000 (23:46 +0000)]

initial talk

git-svn-id: svn://svn.oetiker.ch/rrdtool/trunk@1189 a5681a0c-68f1-0310-ab6d-d61299d08faa

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oetiker [Fri, 3 Aug 2007 21:27:31 +0000 (21:27 +0000)]

addded details

git-svn-id: svn://svn.oetiker.ch/rrdtool/trunk@1187 a5681a0c-68f1-0310-ab6d-d61299d08faa

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oetiker [Fri, 3 Aug 2007 19:46:17 +0000 (19:46 +0000)]

prepare for the release of rrdtool-1.2.99907080300

git-svn-id: svn://svn.oetiker.ch/rrdtool/trunk@1185 a5681a0c-68f1-0310-ab6d-d61299d08faa

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oetiker [Fri, 3 Aug 2007 19:45:01 +0000 (19:45 +0000)]

remove some things we do not need anymore in 1.3

git-svn-id: svn://svn.oetiker.ch/rrdtool/trunk@1184 a5681a0c-68f1-0310-ab6d-d61299d08faa

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oetiker [Fri, 3 Aug 2007 19:43:47 +0000 (19:43 +0000)]

prepare for the release of rrdtool-1.2.99907080300

git-svn-id: svn://svn.oetiker.ch/rrdtool/trunk@1183 a5681a0c-68f1-0310-ab6d-d61299d08faa

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oetiker [Fri, 3 Aug 2007 19:43:21 +0000 (19:43 +0000)]

prepare for 1.3 beta 1

git-svn-id: svn://svn.oetiker.ch/rrdtool/trunk@1182 a5681a0c-68f1-0310-ab6d-d61299d08faa

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oetiker [Fri, 3 Aug 2007 19:26:41 +0000 (19:26 +0000)]

continue with the revision numbering

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oetiker [Fri, 3 Aug 2007 19:17:13 +0000 (19:17 +0000)]

added notes on pango inline formatting

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oetiker [Thu, 2 Aug 2007 18:21:34 +0000 (18:21 +0000)]

talk updates

git-svn-id: svn://svn.oetiker.ch/rrdtool/trunk@1179 a5681a0c-68f1-0310-ab6d-d61299d08faa

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oetiker [Wed, 1 Aug 2007 15:29:09 +0000 (15:29 +0000)]

only release cairo stuff if we ever initialized it.

git-svn-id: svn://svn.oetiker.ch/rrdtool/trunk@1178 a5681a0c-68f1-0310-ab6d-d61299d08faa

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oetiker [Wed, 1 Aug 2007 15:28:03 +0000 (15:28 +0000)]

fix for 64bit portability problem ... unsigned long is not int

git-svn-id: svn://svn.oetiker.ch/rrdtool/trunk@1177 a5681a0c-68f1-0310-ab6d-d61299d08faa

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oetiker [Tue, 31 Jul 2007 04:53:04 +0000 (04:53 +0000)]

reindented

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oetiker [Mon, 30 Jul 2007 22:29:24 +0000 (22:29 +0000)]

added toppics

git-svn-id: svn://svn.oetiker.ch/rrdtool/trunk@1174 a5681a0c-68f1-0310-ab6d-d61299d08faa

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oetiker [Wed, 25 Jul 2007 20:38:37 +0000 (20:38 +0000)]

fixed indenting

git-svn-id: svn://svn.oetiker.ch/rrdtool/trunk@1173 a5681a0c-68f1-0310-ab6d-d61299d08faa

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oetiker [Wed, 25 Jul 2007 20:38:26 +0000 (20:38 +0000)]

make sure we check input even when the previous update was a 'U' ... and some indenting fixes

git-svn-id: svn://svn.oetiker.ch/rrdtool/trunk@1172 a5681a0c-68f1-0310-ab6d-d61299d08faa

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oetiker [Tue, 24 Jul 2007 20:35:36 +0000 (20:35 +0000)]

added missing header

git-svn-id: svn://svn.oetiker.ch/rrdtool/trunk@1170 a5681a0c-68f1-0310-ab6d-d61299d08faa

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oetiker [Sun, 22 Jul 2007 15:51:39 +0000 (15:51 +0000)]

new consolidation functions must be added last or this will break binary compatibility

git-svn-id: svn://svn.oetiker.ch/rrdtool/trunk@1169 a5681a0c-68f1-0310-ab6d-d61299d08faa

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oetiker [Sun, 22 Jul 2007 15:50:21 +0000 (15:50 +0000)]

don't force data out ... let cache management do this

git-svn-id: svn://svn.oetiker.ch/rrdtool/trunk@1168 a5681a0c-68f1-0310-ab6d-d61299d08faa

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oetiker [Sun, 22 Jul 2007 09:47:53 +0000 (09:47 +0000)]

Only create version 4 rrd files if the new holtwinters MHW.. CF is used.

git-svn-id: svn://svn.oetiker.ch/rrdtool/trunk@1167 a5681a0c-68f1-0310-ab6d-d61299d08faa

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oetiker [Sat, 21 Jul 2007 19:55:00 +0000 (19:55 +0000)]

* remove some experimental code from rrd_open
* rrd_dontneed will release all data except for header blocks and RRA hot blocks
which are going to be updated withing 10 minutes.

git-svn-id: svn://svn.oetiker.ch/rrdtool/trunk@1166 a5681a0c-68f1-0310-ab6d-d61299d08faa

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oetiker [Sat, 21 Jul 2007 19:53:52 +0000 (19:53 +0000)]

for now, do not release fetched data ... in the future we may call rrd_dontneed and let the users decied with an option
if they want to keep the data in cache ...

git-svn-id: svn://svn.oetiker.ch/rrdtool/trunk@1165 a5681a0c-68f1-0310-ab6d-d61299d08faa

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oetiker [Sat, 21 Jul 2007 19:52:17 +0000 (19:52 +0000)]

the fonts are now taken from the system. we do not distribute them anympore

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oetiker [Sat, 21 Jul 2007 19:37:50 +0000 (19:37 +0000)]

not on update rrd version

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oetiker [Fri, 20 Jul 2007 22:20:18 +0000 (22:20 +0000)]

we have a new holtwinders aggregation fucntion, so we have a new version ...

git-svn-id: svn://svn.oetiker.ch/rrdtool/trunk@1162 a5681a0c-68f1-0310-ab6d-d61299d08faa

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oetiker [Fri, 20 Jul 2007 22:19:53 +0000 (22:19 +0000)]

check for fadvise all the time

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oetiker [Fri, 20 Jul 2007 22:16:36 +0000 (22:16 +0000)]

better docs on the aggregate functions

git-svn-id: svn://svn.oetiker.ch/rrdtool/trunk@1160 a5681a0c-68f1-0310-ab6d-d61299d08faa

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oetiker [Wed, 18 Jul 2007 22:02:18 +0000 (22:02 +0000)]

added note on locale

git-svn-id: svn://svn.oetiker.ch/rrdtool/trunk@1159 a5681a0c-68f1-0310-ab6d-d61299d08faa

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oetiker [Wed, 18 Jul 2007 21:59:10 +0000 (21:59 +0000)]

some more piechart removed

git-svn-id: svn://svn.oetiker.ch/rrdtool/trunk@1158 a5681a0c-68f1-0310-ab6d-d61299d08faa

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oetiker [Wed, 18 Jul 2007 21:47:26 +0000 (21:47 +0000)]

make sure all ascii to float parsing uses LC_NUMERIC = C so that we do not stuble on locales confusing the , with a .

git-svn-id: svn://svn.oetiker.ch/rrdtool/trunk@1157 a5681a0c-68f1-0310-ab6d-d61299d08faa

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oetiker [Wed, 18 Jul 2007 00:30:49 +0000 (00:30 +0000)]

* rrd_open: rrd_close does not purge file from cache
* rrd_open: new function rrd_dontneed for purging un-needed pages from core
* rrd_open: in linux at least only fadivse DONTNEED has the power to purge
pages from cache, so letst call madvise as well as fadvise
* rrd_create: uses open/write/close now, flushes file to disk and keeps only hot pages in core
* rrd_update: keeps only hot pages in core
* configure enables FADVISE even when mmap is in use

git-svn-id: svn://svn.oetiker.ch/rrdtool/trunk@1156 a5681a0c-68f1-0310-ab6d-d61299d08faa

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oetiker [Tue, 17 Jul 2007 21:46:00 +0000 (21:46 +0000)]

added comment on float cookie

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oetiker [Mon, 16 Jul 2007 06:37:07 +0000 (06:37 +0000)]

fix for fetch in ruby bindings and support for info added.

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oetiker [Sat, 14 Jul 2007 13:26:11 +0000 (13:26 +0000)]

added report

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oetiker [Thu, 12 Jul 2007 20:33:47 +0000 (20:33 +0000)]

improve wording

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oetiker [Thu, 12 Jul 2007 20:33:37 +0000 (20:33 +0000)]

fix tcl build settup

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oetiker [Thu, 12 Jul 2007 20:33:12 +0000 (20:33 +0000)]

monor updates

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oetiker [Wed, 11 Jul 2007 23:08:47 +0000 (23:08 +0000)]

usr rrd_free for freeing the rrd structs ... vito caputo

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oetiker [Tue, 10 Jul 2007 05:31:13 +0000 (05:31 +0000)]

fixed linebreak

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oetiker [Mon, 9 Jul 2007 20:18:43 +0000 (20:18 +0000)]

remove the 3.5h comment

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oetiker [Fri, 6 Jul 2007 14:05:19 +0000 (14:05 +0000)]

initial emanics versions

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oetiker [Thu, 5 Jul 2007 15:19:27 +0000 (15:19 +0000)]

prevent potential segfaults on boxes where time_t is not long

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oetiker [Sun, 24 Jun 2007 11:42:21 +0000 (11:42 +0000)]

add halfday

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oetiker [Sun, 24 Jun 2007 11:41:15 +0000 (11:41 +0000)]

fritz fix

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oetiker [Tue, 19 Jun 2007 06:26:07 +0000 (06:26 +0000)]

updated for lisa

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oetiker [Mon, 18 Jun 2007 18:25:35 +0000 (18:25 +0000)]

fix indentation

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oetiker [Mon, 18 Jun 2007 16:05:07 +0000 (16:05 +0000)]

Bernhard Fischer:

- move several static struct option out of loops and makes them
non-static
- moves some functions from old-style definitions into new-style
definitions

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oetiker [Sat, 16 Jun 2007 23:20:23 +0000 (23:20 +0000)]

Bernhard is not Benrard

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oetiker [Sat, 16 Jun 2007 05:32:23 +0000 (05:32 +0000)]

lets have just a single rrdtool extension annd not two ...
-- Jarod Wilson <jwilson@redhat.com>

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oetiker [Fri, 15 Jun 2007 21:49:52 +0000 (21:49 +0000)]

notes on evans contribs

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oetiker [Fri, 15 Jun 2007 21:41:54 +0000 (21:41 +0000)]

rrdtool.spec from Jarod "redhat" Wilson

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oetiker [Fri, 15 Jun 2007 08:09:13 +0000 (08:09 +0000)]

updated contributors

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oetiker [Fri, 15 Jun 2007 08:01:04 +0000 (08:01 +0000)]

added note on TEXTALIGN

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oetiker [Fri, 15 Jun 2007 07:59:01 +0000 (07:59 +0000)]

There are two popular variants of the Holt-Winters forecasting method; RRDtool
supports the "additive" method, which means that seasonal variation is simply
added to the baseline. For our application, it would be more appropriate to use
the "multiplicative" Holt-Winters method, where seasonal variation is a
coefficient multiplied by the baseline. Quick example to illustrate the
difference: if the average doubles season-over-season, the additive method
would predict the delta between min and max to be constant, whereas the
multiplicative method would predict the delta to double as well.

Attached is a patch against trunk to support the multiplicative method. I've
done this with a new consolidation function, MHWPREDICT, which is essentially
interchangeable with HWPREDICT. There is a noticeable improvement in prediction
deviations for certain types of functions; the attachments show HWPREDICT and
MHWPREDICT predictions for a function with an x*sin(x) component.

Because HWPREDICT and MHWPREDICT differ only in their equations, I've factored
out their math into rrd_hw_math.c. The appropriate smoothing functions are
passed to the update functions in a container of function pointers, which are
called where appropriate. Thus the additive and multiplicative methods use the
same update functions, and the right equations are evaluated without having
flag checks everywhere. This approach, I think, makes the algorithms quite
clear, with minimal duplicate code.

I have moved update_hwpredict, update_seasonal, update_devpredict,
update_devseasonal, and update_failures into a separate file, rrd_hw_update.c,
with some slight refactoring related to rrd_hw_math.c. I ran some
regression tests against trunk to make sure I didn't break anything with
the existing HWPREDICT code.

MHWPREDICT uses the same deviation smoothing and failure detection algorithms
as HWPREDICT.

Some helpful references on the multiplicative Holt-Winters method:

http://www.it.iitb.ac.in/~praj/acads/seminar/04329008_ExponentialSmoothing.pdf
(a student's quick overview of additive vs. multiplicative HW)

http://ideas.repec.org/p/msh/ebswps/1999-1.html (paper on variations to the
multiplicative Holt-Winters, including variance calculations; FYI, my
implementation uses "Model 1")

My employer and the owner of this patch (IMVU, Inc.) is happy to license it
under the same terms as RRDtool, i.e. give it to the project.
-- Evan Miller emiller imvu.com

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oetiker [Fri, 15 Jun 2007 06:43:36 +0000 (06:43 +0000)]

oops missed to update the in memory output interface here

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