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update notes after revert

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John Cupitt 2017-02-27 11:06:46 +00:00
parent 96b1aba1a7
commit a243220171
1 changed files with 0 additions and 62 deletions
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62
TODO
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@ -1,70 +1,8 @@
- we currently have
reexamine cache sizing ... are they too large?
is thumbnail thinstrip or fatstrip? how does that affect seq cache sizing?
add something to linecache (and tilecache?) to get it to display cache size
sinkdisk could use a smaller wbuffer for thinstrip .. thinstrip * nthreads high
... this would reduce the size of the input caches we need during shrink
same for fatstrip ... would it be less than tile-height?
deprecate UNBUFFERED? it will probably not work now
* seq is on line 1000
* thread1 asks for line 2000 and blocks on seq->ready
* thread2 asks for line 2001 and also blocks
* thread1 times out and skips ahead to 2000
* thread1 wakes up thread2
* thread2 reads 2001
we could have
* seq is on line 1000
* thread1 asks for line 2000 and blocks on seq->ready
* thread2 asks for line 2001
* thread2 sees that another thread is blocked earlier, so there has
probably been a skip
* thread2 sets a "skipahead" flag, then wakes up thread1 and sleeps
itself
* thread1 wakes, skips to 2000, wakes thread2 and returns
* thread2 wakes, reads 2001, and returns
we could keep a list of all the blocked threads, sorted by y request, then
only unblock the lowest numbered one when the whole threadpool is waiting
this sounds like the safest idea
we could get rid of the first tile is single-threaded hack as well
argh no, we may not ever get more than one thread blocked on a seq
we just have to get rid of seq and rely on a larger buffer behind the
processing point
use sinkdisk / sinkmemory to limit the amount that threads can get out of
sync ... we must stop starting new threads if an old thread is taking too
long to produce its tile
sinkdisk will do this automatically, since it only keeps two lines of tiles
sinkmemory will need to have something added
- vips linecache has access there twice!
$ vips linecache
...
- make a test image with
make a huge 1 bit tiff in nip2, save
put everything into one strip wih
tiffcp crazy.tif x.tif -s -r 93720 -c g4
- not sure about utf8 error messages on win
- strange: