On 27 June 2013 16:48, Aleksander Morgado <aleksan...@lanedo.com> wrote:
> On 27/06/13 16:26, Jonatan Pålsson wrote: > > To start with, I would like to submit a patch containing a new extractor > > for PNG files, which is faster than the original. > > > > The reason behind the speed increase with this extractor compared to the > > old extractor is that the new extractor seek()s out the metadata fields > > in the PNG, rather than traverse the entire file to find them, as the > > old extractor did (using libpng). > > Could you share some numbers on which is the actual speed improvement? > E.g. extracting 1000 random PNGs before took Xs, now it takes Ys. Certainly! I'm running Tracker on a PandaBoard Rev A4. 1000 replicated PNGs were used, I could make the replicated file available, there is nothing special about it. I used the following command to measure the running times: # For png-faster tracker-control -r ; echo 3 > /proc/sys/vm/drop_caches ; sync ; sync ; time /usr/lib/tracker/tracker-miner-fs -v 0 --no-daemon # For the original PNG extractor tracker-control -r ; /usr/lib/tracker/tracker-extract -m png echo 3 > /proc/sys/vm/drop_caches ; sync ; sync ; time /usr/lib/tracker/tracker-miner-fs -v 0 --no-daemon And here are the results: # png-faster real 0m14.804s user 0m4.945s sys 0m1.313s # original real 1m33.274s user 0m5.250s sys 0m1.820s Regards, Jonatan
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