search for: debug35

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2016 Mar 08
4
llvm and clang are getting slower
...is "backend" from clang's perspective) Let's look at the difference between 3.5 and trunk. For debug, the user time jumps from 174m50.251s to 197m9.932s. That's {10490.3, 11829.9} seconds, respectively. For release, the corresponding numbers are: {9826.71, 12714.3} seconds. debug35 = 10490.251 debugTrunk = 11829.932 debugTrunk/debug35 == 1.12771 debugRatio = 1.12771 release35 = 9826.705 releaseTrunk = 12714.288 releaseTrunk/release35 == 1.29385 releaseRatio = 1.29385 For simplicity, let's use a simple linear model for the distribution of slowdown between the frontend...
2016 Mar 09
2
llvm and clang are getting slower
...rspective) > > Let's look at the difference between 3.5 and trunk. > > For debug, the user time jumps from 174m50.251s to 197m9.932s. > That's {10490.3, 11829.9} seconds, respectively. > For release, the corresponding numbers are: > {9826.71, 12714.3} seconds. > > debug35 = 10490.251 > debugTrunk = 11829.932 > > debugTrunk/debug35 == 1.12771 > debugRatio = 1.12771 > > release35 = 9826.705 > releaseTrunk = 12714.288 > > releaseTrunk/release35 == 1.29385 > releaseRatio = 1.29385 > > For simplicity, let's use a simple linear mode...
2016 Mar 08
9
llvm and clang are getting slower
I have just benchmarked building trunk llvm and clang in Debug, Release and LTO modes (see the attached scrip for the cmake lines). The compilers used were clang 3.5, 3.6, 3.7, 3.8 and trunk. In all cases I used the system libgcc and libstdc++. For release builds there is a monotonic increase in each version. From 163 minutes with 3.5 to 212 minutes with trunk. For comparison, gcc 5.3.2 takes