98.03%

Message boards : Number crunching : 98.03%
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Fischer-Kerli
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Message 10427 - Posted: 6 Apr 2010, 10:29:20 UTC

Just curious: As long as I can remember, the last progress percentage shown in BOINC mgr the moment before a BURP WU completes is something like 98.031% or 98.034% ... never higher. Why?
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Profile Janus
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Message 10435 - Posted: 6 Apr 2010, 15:38:42 UTC

The last 2% are reserved for writing out and packing the result file, cleaning up memory etc. For large sessions this may take a while, for smaller ones it may be almost instant. It also depends a lot on how good your computer is. New machines with big disk caches, big buffers etc. will sprint through this while older machines will have a harder time managing the I/O taking place.

Similarly the initial few % are reserved for reading, unpacking and parsing the input file(s).

All progress updates inbetween these two points are calculated based on feedback from Blender. Blender only gives feedback for each "bucket" rendered, so an "intelligent" interpolation algorithm is used to translate that into an approximate progress which is updated every second (this is the same algorithm that freaks out and reports negative progress when Blender suddenly discovers that there was more work to do than originally anticipated).
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Fischer-Kerli
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Message 10439 - Posted: 6 Apr 2010, 16:19:16 UTC - in response to Message 10435.  

Thank you, Janus! I must have been seeing this for five years now, so I thought it was about time to ask ...
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Message boards : Number crunching : 98.03%