Changes between Version 14 and Version 15 of RRDtool13
- Timestamp:
- Jun 14, 2007, 10:55:03 PM (15 years ago)
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RRDtool13
v14 v15 1 1 = Features for RRDtool 1.3 = 2 3 == Updates == 4 5 || 2007-06-14 || Performance impact of MMAP IO and madvise quantified. || 6 || || Added TEXTALIGN command || 7 2 8 3 9 == Completed == … … 6 12 7 13 The whole IO subsystem has been redone by Bernhard Fisher. It can now uses 8 MMAPed IO for all rrd file access.14 MMAPed IO for all RRD file access and uses madvise extensively to help the kernel with cache handling. 9 15 10 (Performance testing not done yet, but the load on the Kernel IO should be much lighter) 16 The net effect is that in-memory updates are about twice as fast as before. 17 My coreduo thnkpad was able todo 12k updates per second (in memory) with the 18 1.2 code base while it is able to do 22k updates per second (in memory). 11 19 12 === Cairo/Pango === 20 Obviously RRD data has to go to disk eventually, there has not been all that much change, 21 since the OS still has to write the blocks. My 5400 RPM Thinkpad HD continues to get about250 Updates 22 to disk per second. 23 24 The interesting thing here is that we are telling the kernel that we will not read the whole RRDfile 25 but just some blocks of it (random access). This helps optimize cache access and reduces disk IO. 26 The main advantage of this is that the cache usage gets optimized. The number of RRDfiles 27 that can be kept in cache at any one time is 3 to 5 times as large in 1.3 as in 1.2. 28 29 === Graphing with Cairo/Pango === 13 30 14 31 No more libart, no more strange error messages about stability. 15 32 The switch to Cairo makes for a number of neat new features: 16 33 17 * --graph-render-mode=mono brings back the rrdtool 1.0.x look and feel[[BR]][[Image(minmax.mono.png)]][[BR]]. The anti aliasing can be configured for34 * --graph-render-mode=mono brings back the rrdtool 1.0.x look and feel[[BR]][[Image(minmax.mono.png)]][[BR]]. The anti aliasing can be configured for 18 35 graph and fonts separately. 19 36 * full grid-fitting of all drawing operations makes for crisper looking graph output … … 31 48 font properties inside any rrdtool graph text field. 32 49 50 === Other Enhancements === 51 52 TEXTALIGN:: 53 The TEXTALIGN command lets you specify how the legend of the graph should be aligned by 54 default. 55 {{{ 56 TEXTALIGN:left 57 }}} 33 58 == Planned == 34 59 … … 36 61 1. Architecture independent data format with xdr (tobi with help from Matt Massie) 37 62 1. command line parsing with popt (or some other thread-safe thing) (tobi) 38 1. ALIGN:left|right|both function to alter the way rrdtool acts on encountering a full line.39 At the moment it justifies the line which may not look good in all cases40 63 41 64 == Maybe ==