Changes between Version 15 and Version 16 of RRDtool13

Timestamp:

Jun 14, 2007, 10:59:31 PM (15 years ago)

Author:

oetiker

Comment:

wording improved

RRDtool13

@@ -15 +15 @@
 
 The net effect is that in-memory updates are about twice as fast as before.
-My coreduo thnkpad was able todo 12k updates per second (in memory) with the
+My CoreDuo Thinkpad was able to do 12k updates per second (in memory) with the
 1.2 code base while it is able to do 22k updates per second (in memory).
 
 Obviously RRD data has to go to disk eventually, there has not been all that much change, 
-since the OS still has to write the blocks. My 5400 RPM Thinkpad HD continues to get about250 Updates
-to disk per second.
+since the OS still has to write the blocks. My 5400 RPM Thinkpad HD continues to run at
+about 250 RRD updates per second.
 
-The interesting thing here is that we are telling the kernel that we will not read the whole RRDfile
-but just some blocks of it (random access). This helps optimize cache access and reduces disk IO.
-The main advantage of this is that the cache usage gets optimized. The number of RRDfiles
+Since we are now telling the kernel that we will not read/write the whole RRD file
+but just some blocks of it (random access) the disk access could be optimized and cache usage generally reduced. The number of RRD files
 that can be kept in cache at any one time is 3 to 5 times as large in 1.3 as in 1.2.