Changes between Version 15 and Version 16 of RRDtool13


Ignore:
Timestamp:
Jun 14, 2007, 10:59:31 PM (15 years ago)
Author:
oetiker
Comment:

wording improved

Legend:

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  • RRDtool13

    v15 v16  
    1515
    1616The 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
     17My CoreDuo Thinkpad was able to do 12k updates per second (in memory) with the
    18181.2 code base while it is able to do 22k updates per second (in memory).
    1919
    2020Obviously 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.
     21since the OS still has to write the blocks. My 5400 RPM Thinkpad HD continues to run at
     22about 250 RRD updates per second.
    2323
    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
     24Since we are now telling the kernel that we will not read/write the whole RRD file
     25but just some blocks of it (random access) the disk access could be optimized and cache usage generally reduced. The number of RRD files
    2726that can be kept in cache at any one time is 3 to 5 times as large in 1.3 as in 1.2.
    2827

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