Hi, Am Freitag, den 01.08.2014, 23:27 +0200 schrieb Joachim Breitner:
Am Freitag, den 01.08.2014, 20:28 +0000 schrieb Simon Peyton Jones:
Urk. It's quite surprising that this particular change would increase allocation significantly. I wonder whether it just pushed it over the threshold.
I’m confident it was not just that:
~/logs $ fgrep 'Deviation haddock.base(normal) max_bytes_used' $(cd ghc-master; git log --oneline --first-parent db19c665ec5055c2193b2174519866045aeff09a..HEAD | cut -d\ -f1| (cd ..; while read x ; do test -e $x.log && echo $x.log; done) |tac )|tail -n 25 6fa6caa.log: Deviation haddock.base(normal) max_bytes_used: 2.2 % a0ff1eb.log: Deviation haddock.base(normal) max_bytes_used: -1.0 % 0be7c2c.log: Deviation haddock.base(normal) max_bytes_used: 2.2 % dc7d3c2.log: Deviation haddock.base(normal) max_bytes_used: 2.2 % 7381cee.log: Deviation haddock.base(normal) max_bytes_used: 2.2 % fe2d807.log: Deviation haddock.base(normal) max_bytes_used: 2.2 % bfaa179.log: Deviation haddock.base(normal) max_bytes_used: -0.9 % 1ae5fa4.log: Deviation haddock.base(normal) max_bytes_used: 11.0 % c97f853.log: Deviation haddock.base(normal) max_bytes_used: 11.0 % fd47e26.log: Deviation haddock.base(normal) max_bytes_used: 11.2 % bdf0ef0.log: Deviation haddock.base(normal) max_bytes_used: 11.1 % [..]
Interestingly, bytes_allocated did not change a bit!
your surprise made me investigate further. Could this have been caused by this change to how I run the testsuite, which I did roughly around that time? -run make -C testsuite fast VERBOSE=4 THREADS=8 +run make -C testsuite fast VERBOSE=4 THREADS=8 NoFibRuns=15 .... No, no difference. But the value changed again: d4d4bef.log: Deviation haddock.base(normal) max_bytes_used: 11.2 % 8df7fea.log: Deviation haddock.base(normal) max_bytes_used: -0.0 % 3faff73.log: Deviation haddock.base(normal) max_bytes_used: -0.0 % 0336588.log: Deviation haddock.base(normal) max_bytes_used: -0.2 % 02975c9.log: Deviation haddock.base(normal) max_bytes_used: -0.1 % 578fbec.log: Deviation haddock.base(normal) max_bytes_used: -0.2 % e69619e.log: Deviation haddock.base(normal) max_bytes_used: 0.0 % 105602f.log: Deviation haddock.base(normal) max_bytes_used: -0.2 % fbd0586.log: Deviation haddock.base(normal) max_bytes_used: -6.5 % ab90bf2.log: Deviation haddock.base(normal) max_bytes_used: -6.5 % f293931.log: Deviation haddock.base(normal) max_bytes_used: -6.6 % and fbd0586 really looks harmless. Not sure what is going on here. I find the changes to be too big (and within a certain range of commits too deterministic) to be just the consequence of RTS timer noise. Greetings, Joachim -- Joachim “nomeata” Breitner mail@joachim-breitner.de • http://www.joachim-breitner.de/ Jabber: nomeata@joachim-breitner.de • GPG-Key: 0xF0FBF51F Debian Developer: nomeata@debian.org